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Mello, Rafael Gonçalves Licursi de. "Active and passive metasurfaces : methodology for the design of a low profile, beam-steerable, multiband, and wideband antenna". Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAT025.
Pełny tekst źródłaMetasurfaces are artificial engineered materials that can be combined with traditional microwave components in ground-breaking solutions. The research on the use of metasurfaces in the roles of antenna reflector and/or superstrate considerably increased mainly from the beginning of the 2020s, because of their innovative functionalities in line with the ultimate Telecommunication trends. In this thesis, methodologies for the use of passive and active metasurfaces in the design of antennas are presented. A first methodology which exploits both the near-perfect electric conductor (PEC) and near-perfect magnetic conductor (PMC) behaviors of a dual-band artificial magnetic conductor (AMC) is used to design a low-profile, multiband, directive antenna. This methodology is validated with a prototype suitable for the European standards of 4G/5G and Wi-Fi 2.4/5/6E, operating within the following bands: 2.40–2.70 GHz, 3.40–3.80 GHz, 5.17–5.83 GHz, and 5.93–6.45 GHz. Additionally, a methodology to handle the Fabry-Pérot mechanism in an antenna composed of a grooved rounded-edge bow-tie, a passive dual-band AMC, and an active multiband Huygens metasurface is presented. This methodology is validated with the design of a multiband, directive, low-profile, antenna that performs an independent beam-steering in only one of the operating frequency bands. Through the controlling of the bias voltages over four columns of varactors in the reconfigurable, multiband Huygens metasurface, the beam may be dynamically steered in ±51°, in a continuous manner, in a frequency range lying inside the European 5G frequency range (from 3.50 to 3.65 GHz. All at once, the radiation patterns concerning the 4G and Wi-Fi 2.4/5/6E keep practically unaffected
Yousuf, Muhammad Amir. "Parametric Modeling of small terminals and Multiband or Ultra wideband Antennas". Palaiseau, Ecole polytechnique, 2011. https://pastel.hal.science/docs/00/63/48/66/PDF/Parametric_Modeling_of_UWB_antennas.pdf.
Pełny tekst źródłaSince the inception of short range Ultra Wideband (UWB) communication systems the factors like device miniaturization and high speed data rate create big challenges for antenna designers. One way to make the design job easy is to statistically model the variabilities of antenna radiation behavior as a function of its geometry. Such an effort is also useful for the better usage of the communication channel by combining the antenna model with it. This thesis is an attempt towards statistical modeling of UWB antennas. The subject faces two main challenges, the creation of sizeable statistical population of the class of antenna design(s) and modeling of antenna's radiation pattern which is composed of huge number of complex parameters. In this thesis we try to answer the former by proposing a generic design approach for UWB planar antennas and the latter by presenting the use of ultra-compressed parametric modeling technique. The generic design approach is based on trapezoidal shapes and offers great flexibility and versatility in designing various UWB antennas. This approach shows a significant ease in antenna optimization (also for population creation) as it reduces the no. Of parameters that controls the antenna geometry without compromising the degree of freedom. Ultra-compressed parametric modeling is based on two antenna synthesis methods, singularity expansion method (SEM) and Spherical mode expansion method (SMEM) that reduce the required no. Of complex parameters for the radiation pattern by 99. 9%, making the modeling effort possible. A statistical model of biconical antenna based on ultra-compressed modeling technique has been presented
Benomar, Ahmed. "Etude des Antennes à Résonateurs Diélectriques. : Application aux Réseaux de Télécommunications". Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0025/document.
Pełny tekst źródłaA fast technological development in the telecommunications domain, as mobile telephony, wireless networks, TV over Satellite, Radar Applications (civil or military)…etc, is observed. This considerable growth has led to enormous needs and caused a major technological evolution in antennas. These have to face different needs such as gain improvement, bandwidth enlargement, and different existing problems, such as cost and overcrowding…etc. Though, our goal is to design antenna topologies that are simple, having Low overcrowding and relatively with high gain operating in multiband and/or ultra large. To achieve this we headed to Dielectric Resonator Antennas (DRA) in UHF and SHF bands. Recently they have been the subject of several studies and have gained great interest from both academic and industrial sectors. Due to their diverse and simple geometries, they can be fed with different usual techniques. Furthermore, they can be smaller than patch antennas. The first part of this work has focused on the study of cylindrical DRAs, and then a validation of the simulating tool has been done after comparison with measurement results. For a multi-standard utilization, enlargement antennas’ operating bands, to have bi-band behaviour, get a modification of the resonant frequency and also a reduction of the overcrowding, the second part is dedicated to the study of new resonator topologies based on a vertical and radial stack of two cylinders, and then a multilayer and ring topologies. The obtained results found their applications in GSM900-DCS1800-UMTS-WiFi…
Muscat, Adrian. "The design of planar low gain, wideband and multiband antennas employing optimisation techniques". Thesis, Queen Mary, University of London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271716.
Pełny tekst źródłaSaleem, Rashid. "Towards an end-to-end multiband OFDM system analysis". Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/towards-an-endtoend-multiband-ofdm-system-analysis(e711f32f-1ac6-4b48-8f4e-58309c0482d3).html.
Pełny tekst źródłaYurduseven, Okan. "Integration of microwave antennas with solar PV for multiband and wideband mobile, WLAN and WiMAX applications". Thesis, Northumbria University, 2014. http://nrl.northumbria.ac.uk/17466/.
Pełny tekst źródłaGarrido, Lopez David. "Low-Profile Multiband and Flush-Mountable Wideband Antennas for HF/VHF and K/Ka Band Applications". Thesis, University of Colorado at Boulder, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10245047.
Pełny tekst źródłaThis thesis introduces several novel antenna systems with extended performance capabilities achieved by either enabling multiple operation bands or by widening the bandwidth. Proposed theoretical concepts are successfully tested through simulations and experiments with excellent agreement are demonstrated. The designs developed in this thesis research are low-profile or flush mountable, enabling simple platform integration.
In the HF/VHF bands, the development of a novel low-profile multiband antenna for vehicular applications is presented. Specifically, an inverted-F antenna is used as a driven element, to operate at the lowest frequency of 27 MHz, whereas two parasitic elements are built as inverted-L monopoles to enable resonances at 49 and 53 MHz. To eliminate the need for an external matching network, an offset feeding technique is used. When the antenna is mounted on a vehicle and bent to follow its profile, a very low-profile is achieved (lambda/44) while good impedance and far-field performance are maintained across all three bands. The developed antenna system is not only electrically smallest among others found in the literature, but it is easily modified for other band selections and tuning of each band can be readily achieved.
Vehicular antennas are often used for high power applications, which may cause exposure of nearby individuals to possibly dangerous electromagnetic fields. To assess this hazard, the RF exposure of a vehicle's crew is discussed and an original and fast modeling approach for prediction thereof is demonstrated. The modeling approach is based on eigenmode analysis for acquiring a range of frequencies where the shielding effectiveness of a vehicle cabin is expected to be lower than average. This approach is typically much faster and requires less computational resources as compared to classical full-wave analyses. This analysis also shows that the position of an antenna system is critical and must be considered when high-power RF emissions are planned.
Following the same trend of antenna system size reduction with extension of capabilities in a congested spectral environment, the millimeter wave spectrum is explored next. Specifically, antenna systems for wideband amplitude only (AO) direction finding (DF) are thoroughly considered. Theory and design considerations are developed to fill gaps in open literature. Typical sources of errors are theoretically analyzed, and a discussion on limitations and advantages of different AO DF architectures is given.
Practical millimeter wave realizations of AO DF antenna front-ends in the K/Ka/Q bands (18-45 GHz) are developed using two different architectures: a passive phased-array and a squinted antenna system. For the former, a tightly coupled two-element tapered slot antenna (TSA) array with a stacked arrangement is developed. A novel enclosure of the array inside an absorbing cavity is proposed and improved system performance with flush mounted configuration is demonstrated. The squinted antenna system avoids the use of a beamformer, therefore reducing insertion loss and amplitude/phase imbalances to reduce DF errors. For design robustness, the same TSA element used in the phased-array configuration is used. A novel tapered cavity is also developed to stabilize H-plane radiation patterns and suppress sidelobes. It is seen that the squinted antenna AO DF front-end has better performance than the phased-array antenna system at the expense of larger size.
A, Rahim Mohamad Kamal. "Wideband active antenna". Thesis, University of Birmingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404129.
Pełny tekst źródłaAdaniya, Hana L. "Wideband active antenna cancellation". Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/47896.
Pełny tekst źródłaIncludes bibliographical references (leaf 91).
There exists a simultaneous transmit and receive antenna system where the transmitted signal is creating wideband interference of the receiver. To resolve this interference problem, the isolation between the transmit antenna and the receive antenna must be increased. This thesis analyzes and discusses various strategies for antenna isolation and demonstrates the feasibility of an adaptive filtering approach on active signal cancellation. The final system design demonstrates that, with a broadband interference source in close proximity to a receiver, it is possible to provide 30 dB of isolation by using active cancellation.
by Hana L. Adaniya.
M.Eng.
Plaivech, Prachaya. "Wideband Antenna Over Ground Plane". Thesis, University of Sheffield, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515450.
Pełny tekst źródłaLourens, Jako. "A wideband monopole antenna design". Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80026.
Pełny tekst źródłaENGLISH ABSTRACT: The successful operation of a man-pack VHF jamming system requires a compact and efficient antenna operating over a wide bandwidth. The design of such an antenna is the focus of this thesis. The antenna should be of a practical size for a portable system and it must radiate energy efficiently across a frequency bandwidth in excess of a decade. A practical „target‟ specification of such an antenna has been drawn up based on the performance of a commercially available system. Several possible antenna topologies, each with a variety of loading section options, are tested using “Full wave” electromagnetic modelling (FEKO). Each topology/loading-section is numerically optimised for load element values by considering both its gain and reflection coefficient. Results of the „optimally loaded‟ solution for each topology are then compared to each other to arrive at the best overall design. The best result is found to be the traditional monopole whip-type antenna, with four R-L loading sections spread along its length. The simulated results show that the proposed antenna can be expected to meet the target standing wave ratio (SWR) specifications while offering a gain advantage of between 5 and 10 dBi higher than is available commercially. The selected design is constructed and its performance measured.
AFRIKAANSE OPSOMMING: Die suksesvolle werking van ʼn mobiele VHF "jammer‟ benodig ʼn kompakte antenna met ʼn bruikbare benuttingsgraad wat oor ʼn wyeband funksioneer. Die ontwerp van so ʼn antenna is die fokus van hierdie tesis. Die antenna moet kompak genoeg wees om draagbaar te wees en moet ʼn bruikbare benuttingsgraad hê oor ʼn frekwensie-bandwydte van meer as 10:1. ʼn Praktiese spesifikasie is opgestel vir die antenna deur te kyk na die sigblaaie van beskikbare stelsels. “Volgolf” elektromagnetiese modelleringsagteware is daarna gebruik om ʼn parametriese ondersoek te loods van verskillende antennas. Verskillende topologieë is getoets met ʼn verskeidenheid van belaaide seksies waar die topologieë ge-optimaliseer was vir wins en weerkaatskoëffisiënt. Die resultate vir elke optimale oplossing is vergelyk.Opgrond van hierdie resultate is bevind dat die beste topologie die tradisionele monopoolmas "whip-type‟ antenna is met vier RL lading afdelings langs die lengte versprei. Analise word gebruik om te wys dat verwag kan word dat dit aan die aanwins en staande golf verhouding (SGV) spesifikasies sal voldoen met n 10 dB verhoging in aanwins vir n laer SGV. Die geselekteerde ontwerp is gebou en gemeet om te verifieer dat dit aan die spesifikasies voldoen.
Seko, Murilo Hiroaki. "Antenas planares de micro-ondas multibandas para terminais móveis de sistemas de comunicação sem fio". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-31072013-002544/.
Pełny tekst źródłaIn this work, multi-band microwave planar antennas for application in mobile terminals of wireless communication systems were developed. A study on microwave planar antennas was performed with emphasis on design techniques that enable their operation in wide bands and multiple bands. From the knowledge gained from this study, antenna configurations for mobile terminals of current mobile telephony, WLAN and WPAN systems, which have experienced in recent years great popularity worldwide, were proposed. By means of a design procedure aided by computer electromagnetic simulation, the proposed antenna configurations were analyzed and optimized in order to meet the design specifications established for operation in the afore mentioned systems. The performance that can be obtained with these antenna configurations depends on their several geometric parameters, resulting in design flexibility for obtaining the desired operation bands. Prototypes of the designed antennas were fabricated and characterized to validate the proposed antenna configurations and the design procedure employed. Four antennas were developed for operation in mobile telephony, WLAN and WPAN systems employed in Brazil, Europe and USA: a tri-band planar inverted-F antenna with novel configuration for operation in GSM, DCS and PCS standard bands; a penta-band planar inverted-F antenna with novel configuration for operation in GSM, DCS, PCS and UMTS standard bands and 2,400 MHz ISM band; two quad-band antennas, one of them planar inverted-F and the other printed monopole with novel configuration, for operation in 2,400 MHz and 5,800 MHz ISM bands and 5,200 MHz and 5,600 MHz bands. The experimental results from the fabricated prototypes exhibited, in general, good agreement with the results provided by simulation and showed that the developed antennas met the specifications established for them. By means of both simulation and experimental results, the performance of the developed antennas could be verified, and the effectiveness of the design procedure adopted was demonstrated.
Lai, Hau Wah. "Wideband meandering probe-fed patch antenna /". access full-text access abstract and table of contents, 2005. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ee-b19887383a.pdf.
Pełny tekst źródła"Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references (leaves 144-153).
Powell, Johnna 1980. "Antenna design for ultra wideband radio". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28542.
Pełny tekst źródła"May 2004."
Includes bibliographical references (p. 108-109).
The recent allocation of the 3.1-10.6 GHz spectrum by the Federal Communications Commission (FCC) for Ultra Wideband (UWB) radio applications has presented a myriad of exciting opportunities and challenges for design in the communications arena, including antenna design. Ultra Wideband Radio requires operating bandwidths up to greater than 100% of the center frequency. Successful transmission and reception of an Ultra Wideband pulse that occupies the entire 3.1-10.6 GHz spectrum require an antenna that has linear phase, low dispersion and VSWR [< or =] 2 throughout the entire band. Linear phase and low dispersion ensure low values of group delay, which is imperative for transmitting and receiving a pulse with minimal distortion. VSWR [< or =] 2 is required for proper impedance matching throughout the band, ensuring at least 90% total power radiation. Compatibility with an integrated circuit also requires an unobtrusive, electrically small design. The focus of this thesis is to develop an antenna for the UWB 3.1-10.6 GHz band that achieves a physically compact, planar profile, sufficient impedance bandwidth, high radiation pattern and near omnidirectional radiation pattern.
by Johnna Powell.
S.M.
Licul, Stanislav. "Ultra-Wideband Antenna Characterization and Modeling". Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29487.
Pełny tekst źródłaPh. D.
Huynh, Minh-Chau. "Wideband Compact Antennas for Wireless Communication Applications". Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29853.
Pełny tekst źródłaPh. D.
Smith, Christopher Brian. "Wideband dual-linear polarized microstrip patch antenna". [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3162.
Pełny tekst źródłaLai, Kin-Yue Albert. "A novel antenna for ultra-wideband applications /". The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487685204967095.
Pełny tekst źródłaGemio, Valero Joan. "Multiband and Silicon Integrated Antennas for Wireless Sensor Networks". Doctoral thesis, Universitat Autònoma de Barcelona, 2011. http://hdl.handle.net/10803/79096.
Pełny tekst źródłaLas tecnologías inalámbricas han provocado una importante revolución en el mundo de las redes y servicios de telecomunicación. Han aparecidos nuevos sistemas, como los teléfonos móviles de última generación o las redes LAN inalámbricas, que han sido aceptados con entusiasmo por la población. En particular, el uso de redes de sensores (para controlar la temperatura, para detectar plazas libres de aparcamiento, etc.) está creciendo rápidamente. Esta tesis se centra en el diseño de antenas para redes de sensores inalámbricos distribuidos. EN concreto se analiza un sistema donde los sensores están conectados a una unidad central utilizando un enlace inalámbrico en la banda ISM de 5.8 GHz, y la unidad central envía la información recogida a Internet a través de una conexión WLAN. En la unidad central se necesitan antenas multibanda para dar servicio a varias bandas de frecuencias con un único elemento radiante. En esta tesis se presentan dos soluciones para obtener este comportamiento multibanda: Monopolos con plano de masa fractal y monopolos cargados con resonadores. Se han fabricado y medido diferentes prototipos que cubren las necesidades del sistema. En los sensores se desean dispositivos de reducidas dimensiones y bajo coste. Una buena opción para lograr estos requisitos es el uso de antenas integradas en silicio fabricadas con una tecnología CMOS estándar. En primer lugar se analizan los principales problemas de la integración de la antena en silicio, y a continuación se presenta una posible solución para mejorar la eficiencia de radiación junto con un estudio de la degradación introducida por otros componentes cuando éstos se fabrican en el mismo chip que la antena. Las medidas de los prototipos fabricados demuestran que la integración de la antena en la banda de 5,8 GHz usando una tecnología CMOS es factible, obteniendo unos alcances de algunos metros incluso cuando la antena se fabrica junto con otros elementos integrados en el mismo chip. Cada vez es una realidad más cercana el hecho de poder tener sensores implantados en el cuerpo. Por este motivo, la última parte de esta tesis se dedica a estudiar los efectos del cuerpo sobre antenas situadas en su interior y evaluar las pérdidas de propagación adicionales introducida por los tejidos humanos.
Wireless technologies have triggered an important revolution in the world of telecommunication networks and services. New systems, such as the latest generation mobile phones or wireless LANs, have appeared being enthusiastically accepted by people. In particular, applications related to remote sensor networks are growing rapidly (for temperature monitoring, the detection of free parking spaces, etc.). This thesis is focused on antenna design for distributed wireless sensor networks. The remote sensors we are considering are connected to a central unit using a wireless link in the 5.8 GHz ISM band and the central unit transmits the collected information to the Internet via a WLAN connection. In the central unit multiband antennas are necessary to cover several frequency bands with a single radiating element. Two solutions to obtain this multiband performance are proposed: fractal-based ground planes and resonator loaded monopoles. Several novel antennas that easily meet the system requirements are manufactured and measured. For remote sensors small dimensions and low costs are desired. The use of silicon integrated antennas fabricated with standard CMOS technology is a good choice to achieve these requirements. First, the main problems of antenna integration are discussed and, then a possible solution to improve the antenna efficiency is presented together with a study of the effects of other elements integrated in the same chip with the antenna. The measurements of the manufactured prototypes demonstrate that antenna integration at 5.8 GHz is feasible, and that system ranges of some meters can be obtained even when the antenna is fabricated together with other elements integrated in the same chip. The possibility of having some of the sensors implanted inside the body will be a reality in the near future, for this reason the particular case of implanted antennas is also analyzed. The last part of this thesis is devoted to study the body effects on antenna performance and evaluate the additional propagation losses introduced by the body tissues.
Alsawaha, Hamad Waled. "Synthesis of Ultra-Wideband Array Antennas". Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/54553.
Pełny tekst źródłaPh. D.
Choi, Tin Chau. "An ultra-wideband magnetic-electric dipole antenna and a shielded slot antenna". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ38622.pdf.
Pełny tekst źródłaSalehi, Mohsen. "Time-varying Small Antennas for Wideband Applications". Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/25435.
Pełny tekst źródłaPh. D.
Shapoury, Alireza. "Ultra wideband antenna array processing under spatial aliasing". [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1495.
Pełny tekst źródłaAdamiak, David V. "Transient field visualization for ultra--wideband antenna design". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA374319.
Pełny tekst źródła"December 1999". Thesis advisor(s): Michael A. Morgan. Includes bibliographical references (p. 89). Also Available online.
Karlsson, Magnus. "Ultra-wideband Antenna and Radio Front-end Systems". Doctoral thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10338.
Pełny tekst źródłaCheng, Shuo-peng, i 鄭碩鵬. "A Reconfigurable Multiband Monopole MIMO Antenna with Wideband Sensing Capability for Cognitive Radio". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/04928024500876707688.
Pełny tekst źródła國立中山大學
電機工程學系研究所
103
Recently, radio spectrum is in high demand as the usage of the spectrum increases day by day at an enormous rate; there is a need to find a solution to efficiently utilize these insufficient resources. Cognitive radio is a huge step towards this goal. Cognitive radio has become a promising technology thanks to its inherent spectrum sensing capability and frequency-agile radio functions for efficient spectrum utilization. In order to achieve a cognitive radio antenna system, we have to design a frequency reconfigurable antenna and a wideband sensing antenna. On the other hand, a multiple-input-multiple-output (MIMO) antenna system is a well-known technique to enhance the performance of wireless communication systems. Quite a few research has been available in each individual field but very few approaches are found in literature where both are combined and utilized. A cognitive radio MIMO antenna is presented in this paper. The proposed antenna consists of two reconfigurable printed monopole antennas and a coplanar waveguide (CPW) fed wideband sensing antenna located between the two antennas. The structure is specially designed for antenna miniature. For multi-channel wireless communication systems, it is essential that the designed multi-antenna would have high isolation between the antenna ports. To this end, the wideband antenna at the middle is utilized as a structure to enhance the isolation of two monopoles. When properly designed, the MIMO antenna can be electronically tuned over the lower ultrawideband (UWB) frequency band (2300–6300 MHz) using two pairs of varactor diodes. The wideband sensing antenna is used to cover a wide range frequency band from 2.2 GHz to more than 7 GHz. The proposed antenna elements develop a complete antenna platform for cognitive radio (CR) applications. The overall size of the antenna is set to be 60 × 40 mm2.
Sie, Bing-Yan, i 謝秉諺. "The Research of Microstrip Antenna of Wideband and Inverted F Antenna of Multibands for Mobile Phones Applications". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/99721918014394501882.
Pełny tekst źródła崑山科技大學
電腦與通訊研究所
103
We present a novel antenna of wideband and omnidirectional characteristics. This antenna fed by a microstrip line and tuned by a little “T” matching network generating three resonant frequency points to construct 2-6 GHz wide bandwidth. This antenna can be applied to the applications of 802.11b/g/n/a/p/h and WiMax. This printed antenna etched on a double-sided FR4 board, the top of the FR4 board is the radiator contains a circle and a rectangle metal components, the bottom is a feeding microstrip line and a little “T” matching network. This FR4 board of 1mm thickness and has the size of 45 mm ×22 mm. Simulation is implemented by software HFSS. Design parameters and comparisons of simulated and measured results of antenna will be discussed in this paper. A small-size double-sided three - layers inverted-F antenna suitable to be printed on the system circuit board for LTE 700/2300/2500 MHz, GSM 900 MHz, WLAN 2400/5200/5800 MHz and WiMax 3500/5500 MHz is presented. With mender microstrip line disperses on double-sided and coupled each other to produce enough bandwidth of low-band and multi-band of high-band, but also makes the size of the radiation side of the proposed antenna is 40 × 13mm2. Including the ground plane, the total antenna size is 0.8mm × 87mm × 40mm of the FR4 substrate. This size and performance of this proposed antenna are suitable to the mobile phone.
Srivastava, Prateek. "MULTIBAND TRIANGULAR PATCH ANTENNA". Thesis, 2015. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14330.
Pełny tekst źródłaDr. Priyanka Jain (Assistant Professor) Department of Electronics & Communication Engineering
KUO, Chun-Yi, i 郭俊逸. "Design of Multiband Planar Antenna". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/94193761606288531922.
Pełny tekst źródłaYUEH, WANG CHUNG, i 王忠嶽. "Multiband Antenna Simulation and Design". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/34012930120670476862.
Pełny tekst źródła大葉大學
電信工程學系碩士在職專班
97
This thesis presents the design of two printed dipole antennas. These two antennas were developed to produce multiple resonant bands so as to support multi-standard wireless-communication products, such as laptop computers, personal digital assistances (PDAs), and mobile wireless networking devices. These standards include GSM 900 MHz (Global System for Mobile Communications; 870-960 MHz), DCS 1800 MHz (Digital Communication System; 1710-1880 MHz), PHS 1900 MHz (Personal Handy-Phone System; 1890-1915 MHz), WCDMA 2100 MHz (Wideband Code-Division Multiple Access; 2100-2170 MHz), WiFi 2.4 GHz (Wireless Local-Area Network; 2400-2483 MHz; also called WLAN), and WiMAX 2.6 GHz (Worldwide Interoperability for Microwave Access; 2.5-2.7 GHz). Note that the antennas presented here were originally designed for FarEastone telecommunications company (FET), for which the required GSM and DCS bands are in the ranges of 870-890 MHz and 1800-1880 MHz, respectively. For these two standards, the designed antennas must cover these two frequency bands, instead of 870-960 MHz and 1710-1880 MHz. For cost saving, the antennas were printed on FR4 substrates with a thickness of 1 mm. Numerical simulation was carried out using Zeland’s IE3D, a full-wave electromagnetic simulator. Before antenna prototypes were constructed and measured, the structural parameters of the designed antennas were varied iteratively until antenna performances are close to the required specifications. The first antenna type is a co-directionally meandered dipole antenna, in which the structures in the two arms of the antenna are almost symmetric with respect to the feeding point. The second antenna type is a bi-directionally meandered dipole antenna, in which the structures in the two arms are nearly anti-symmetric with respect to the feeding point. It is observed that the bi-directionally meandered dipole antenna is slightly more compact than the co-directionally meandered one.
Chen, Wen-Wang, i 陳文旺. "Design of Multiband Operation Antenna". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/58373468536045029929.
Pełny tekst źródła高苑科技大學
電子工程研究所
98
The paper presents study of multi-band monopole antenna, which utilize simulation software Ansoft HFSS 10 to measure the antenna return loss which under -10dB with Smith chart and coincidence to the standard of range, and the multiband ( DVB、 GSM、GPS、DCS、PCS、Bluetooth、WLAN and WiMAX ) are contained and applied. The monopole antenna uses slot、meanderings、parasitic antenna、loop、reflecting board and “ PIFA ”, those techniques attempted to encourage each band effectively. Due to the design of antenna on the base, some slots are used the impedances of loops to compensate and close the impedances of resistors, also the meanderings is used to extension the length if antenna to fit the wavelength, parasitic antenna is used to gain the bandwidth in every each band, than this three prescriptions are inspired to lower noise interrupted at 1.6 GHz ~ 1.7 GHz、2.0 GHz ~ 2.2 GHz and 2.9 GHz ~ 3.2 GHz. At present, the laptop is miniaturization that ever, and the multiband monopole antenna could meet the requested. We will double the loop of antenna that we would use inside the limitation of space of laptop ,and it would be work by double the wave length, double the emerge between the frequencies of low-band and medium-band . The design of “ PIFA ” makes the bandwidth of high-band more wider, cause the Result of match of bandwidth between low-band and high-band is more than 25% ( above 500 MHz ) is fit the definition of Ultra Wide Band ( UWB ).
Siao, Sin-long, i 蕭新朧. "Miniaturized GPS chip antenna and multiband monopole antenna". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/09486805850704632333.
Pełny tekst źródła國立臺灣科技大學
電機工程系
97
For future communication systems, to simultaneously meet various requirements such as low profile, compact size, light weight and easy fabrication, the dimension consideration of antenna design is a very critical part. The radiation performance of the antenna also directly affects the received signal and communication quality. Therefore this thesis proposes a miniature GPS antenna to be built in the mobile phone, PDA and smart phone for obtaining the satellite signals. A commercial EM solver, HFSS has been utilized to design prototype and investigate the performance variation for antenna located at different positions in the test board. Moreover, a multi-band monopole antenna is also presented to integrate more wireless access functions. The operating band of the proposed antenna is composed of GSM, DCS, PCS, UMTS, Bluetooth, WLAN、WiMax, Hyper LAN, WWAN and WiFi. As to achieve a better radiation performance, the antenna also employs two back-strips to enhance more resonant frequencies and flexibly adjust input impedance in this study.
FAN, CHIH-WEI, i 范智偉. "Design of Multiband Coplanar slot antenna". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/63944947429000173611.
Pełny tekst źródła明新科技大學
電機工程系碩士班
104
Coplanar slot antennas with three different shapes of radiator, comb, flag and polygon are designed in this thesis. Changing the element of comb radiator, the suitable size parameters are obtained from simulation. The simulated results are used to produce containing WLAN and LTE frequency bands antenna. Changing ground area of coplanar flag type radiator slot antenna is used to shift the impedance bandwidth to lower frequency. It can also be used to produce containing WLAN and LTE frequency bands antenna. Changing the bevel of polygonal radiator is used to get better size parameters. It can also be used to produce containing WLAN and LTE frequency bands antenna. In this thesis, the glass fiber (FR4) substrate is adopted to fabricate the antenna and IE3D electromagnetic simulation software is used for analyzing the designed antenna. The fabricated comb-radiator slot antenna can be applied to 1.8 / 2.4 / 2.6 / 3.6 GHz bands. The fabricated flag-radiator slot antenna can be applied to 0.7/0.9/1.8/2.4/2.6/3.6 GHz bands. The fabricated polygon-radiator slot antenna can be applied to 1.8 / 2.4 / 2.6 / 3.6 / 4.9 / 5 / 5.1 / 5.8 / 5.9 GHz bands. The obtained polygonal radiator coplanar slot antenna which peak gains are 2.31dBi, 3.76 dBi, 3 dBi, 3.31 dBi, 3.03 dBi, 3.04 dBi, 4.21 dBi, and 4.37 dBi at 1.8 GHz, 2.4 GHz, 2.6 GHz, 3.6 GHz, 4.9 GHz, 5 GHz, 5.8 GHz, and 5.9 GHz, respectively. Keywords: Long term evolution, Coplanar waveguide antenna, Comb-type radiator, Flag-type radiator, Polygonal radiator
Chao, Chun-heng, i 趙君恒. "Study of multiband slot antenna designs". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/2gzp58.
Pełny tekst źródła逢甲大學
電機工程所
100
The thesis focuses on the design of slot antennas. Here, two slot antennas were proposed with different fed-techniques that allow the antennas to operate at different applications. A microstrip-fed slot antenna design for WLAN(2.4/5.2/5.8 GHz)application was initially proposed. In order to achieve dual-band operation, three slots were embedded into the ground plane that located beneath the microstrip feed-line. Two of the loaded slots were of step-impedance (SI) designs, and the third one was an inverted L-shaped slot. The proposed antenna exhibited 10-dB bandwidth of 607 MHz (24.78 %) and 1102 MHz (26.83 %) for the lower and upper operating bands, respectively. Besides demonstrating bi-directional radiation characteristic, steady gain variation and at least 66 % of efficiency were also measured. The second proposed antenna was a coplanar waveguide (CPW)-fed square-ring slot antenna with dual-band operation for WLAN (2.4/5.2/5.8 GHz) and WiMAX (2.3/2.5/3.5/5.7 GHz) applications. The lower operating band was excited by the square-ring with asymmetric ground plane, and the upper operating band was induced by a stub-protruded monopole and a double-bent stub loaded into the ground plane. The antenna has small structure and exhibited bi-directional radiation characteristics. In addition, it also demonstrated steady gain variation within the WLAN and WiMAX operating bands.
TIAN, CHANG-FU, i 田章甫. "Design of Multiband Planar Dipole Antenna". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9tuy5f.
Pełny tekst źródła明新科技大學
電機工程系碩士班
105
In this thesis, FR4 substrate and IE3D software are used to design multi-band antennas, including comb shaped with rectangular arm dipole antenna which can be applied to 1.8GHz,2.4GHz,2.45GHz and 2.6GHz frequency bands, comb shaped with needle arm dipole antenna which can be applied to 1.8GHz,2.4GHz,2.45GHz and 2.6GHz frequency bands, comb shaped with unequal rectangular arm dipole antenna which can be applied to 1.8GHz,2.4GHz,2.45GHz and 2.6GHz frequency bands , and comb shaped slot antenna which can be applied to 0.7GHz 0.9GHz and 1.8GH frequency bands. In this study, the size parameters of comb shaped planar dipole antenna are changed to observe the impacts on antenna characteristics. After simulation, the better parameter values of dipole antenna are obtained and can be used in GPS,RFID,WLAN and LTE frequency bands. The suitable size parameter L5=26.75mm of the comb shaped with uequal rectangular arm dipole antenna is obtained from simulated results. The proposed antenna can be used in RFID, WLAN and LTE frequency bands. The comb arm size parameters of the dipole slot antenna are adjusted to observe the variations with respect to the bandwidth, resonant frequency and gain of the proposed antenna. The better size parameters L5=29mm and L6=15mm are obtained to fabricate the comb dipole slot antenna which can be used in LTE 0.7GHz, LTE 0.9GHz and LTE 1.8GHz frequency bands. The proposed multiband dipole antennas by changing size parameters can be applied to GPS, WLAN, RFID and LTE frequency bands, respectively. Key words:planar dipole antenna、comb shaped rectangular arm、needle arm、WLAN、LTE
Hsieh, Yuan-pu, i 謝沅圃. "Multiband CPW-fed slot antenna design". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/10018352714300872868.
Pełny tekst źródła逢甲大學
電機工程所
98
The thesis focuses on the design of slot antennas and proposes a series of coplanar slot antennas with different structures by using a variety of design methods to meet different applicable frequencies. First, the thesis proposed a dualband coplanar triangle ring slot antenna. The lower band (2.34-2.8 GHz) is excited by the triangular ring slot and capacitive load, while the higher frequency band is excited by two T-slots embedded in the triangular radiation element, and its wide impedance bandwidth (5.15-6.9 GHz) is also due to the capacitive load. This novel antenna can be used in the WLAN 2.4/5.2/5.8 GHz. Then, a coplanar circular ring slot antenna design is proposed, and similar capacitive loading technique from the previous triangle ring slot antenna is used, so that the excited lower resonant mode can operate in the 2.4 GHz band. By inserting a pair of arc-shaped parasitic strip, a 5.8 GHz resonant mode is excited and by combining with the 4.5 GHz resonant mode, a broadband operation that covers the 5.2, 5.5 and 5.8 GHz bands is achieved. Besides demonstrating a bi-directional radiation characteristic, this antenna also shows steady gain variation in the WLAN 2.4/5.2/5.8 GHz operation. Finally, a coplanar rectangular slot antenna design is proposed for WLAN 2.4/5.2/5.8 GHz and WiMAX 2.6/3.5/5.5 GHz operations. The two wideband operations are excited by embedding two inverted L-shaped slot with dissimilar sizes into the rectangular radiating element. This novel antenna also shows steady gain variation in the WLAN and WiMAX operations.
Zeng, Jian-Hong, i 曾建弘. "Design of Multiband Planar MIMO Antenna". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/23593305021202076714.
Pełny tekst źródła龍華科技大學
電子工程系碩士班
102
This thesis presents a compact multiband planar MIMO antenna that covers the standards of the Global System for Mobile (GSM), Long Term Evolution (LTE) and Ultra-Wideband (UWB). The MIMO antenna contains two printed back-to-back multiband monopole elements with a closed distance of one-tenth wavelength of 900MHz. The element in the MIMO antenna is structured by merging an UWB antenna and a parasitic multi-loaded winding line monopole that is capable of providing the broadband coverage for the standards of the GSM, LTE and UWB. The size of the antenna element without ground plane was 30mm x 28mm. Because of the asymmetric element radiation pattern and, thus the MIMO antenna exhibits the desirable low mutual coupling effect at 900MHz frequency band. Further, a pair of meta-material resonator is constructed and placed between antenna elements in order to improve the correlation coefficient at 1.8GHz and 2.2GHz bands. The measured isolations of the prototype are less than -20 dB in all operating frequency bands.
Chen, Zhi-Ying, i 陳智穎. "Design of Printed Multiband LTE Antenna". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/u79ves.
Pełny tekst źródła元智大學
通訊工程學系
106
With the rapid development of cellular communication and higher quality demands by the customers, the communication system has evolved to the fourth generation. Supporting multiple frequency bands in different regions becomes a must for the modern smart phone. In this thesis, a multiband printed antenna for Long-Term-Evolution(LTE) is presented. The proposed antenna is based on a ultra-wide band (UWB) planar triangular monopole antenna (PTMA) and have a volume of 60×100×1.6〖mm〗^3. The size of a PTMA is first enlarged to cover the target LTE multiple bands and a mesh consisting of rectangular metal patch is applied to the additional space above the radiator. The orthogonal array (OA) method is employed to decide the distribution of these grids. Although the OA method doesn’t find the mesh distribution that will cover the LTE lowest band from 700MHz to 960MHz, but it does provide a initial mesh distribution that covers half of this band. Based on the initial pattern calculated by using OA, multiple current path approachs are used to meet the requirements of the lowest LTE band. With several modifications to further improve the impedance matching at higher frequence band, the final antenna is implemented. This S11 of the final antenna matchs the requirement of the LTE bands with two return losses. The bandwidth of the lower band is 262MHz(698-960MHz) with 6dB return loss and that of the higher band is 2590MHz(1410-4000MHz) with 10dB return loss. The measurements of the antenna in chamber, indoor, outdoor, and handled by hands are also presented in this study.
YU, JIA-YI, i 余家一. "Designs on Multiband Antenna for LTE Applications". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/02510455459107705088.
Pełny tekst źródła明新科技大學
電機工程系碩士班
104
In this thesis, coplanar waveguide feed and symmetrical ground are used to design the antenna. Chapter 3 and chapter 4 are themed with miniaturization, broadband and multi-band. Chapter 5 is focused on designing the antenna’s operating frequency bands which cover LTE 0.7/0.9/1.8/2.6GHz and WLAN 4.9GHz bands. In chapter 3, the radiator’s notch size parameter L5, the ground size parameters L2 and W2, and height of needle-shaped radiator H are changed to design the antenna which peak gain are 1.41dBi, 2.93dBi, 3.30dBi, 3.19dBi, 1.99dBi, 3.72dBi, 6.28dBi and 4.15dBi at 1.8GHz, 2.4GHz, 2.45GHz, 2.6GHz, 3.5GHz, 3.6GHz, 5.8GHz and 5.9GHz, respectively. In chapter 4, the parameters including needle-shaped size parameter of radiator W3, feed copper foil size parameter of ground L3, and notch size parameter of ground C2 are changed to design the antenna which peak gain are 3.60dBi, 1.80dBi, 2.80dBi, 2.88dBi, 2.48dBi, 2.14dBi, 2.41dBi, 2.76dBi, 4.96dBi and 3.98dBi at 1.8GHz, 2.4GHz, 2.45GHz, 2.6GHz, 3.5GHz, 3.6GHz, 4.9GHz, 5.1GHz, 5.8GHz and 5.9GHz, respectively. In chapter 5, the upper copper foil size parameter of ground L2 and the size parameters of radiator’s notch W6 and W7 are changed to design the antenna which peak gain are 3.01dBi, 3.08dBi, 1.61dBi, 2.64dBi and 4.36dBi at 0.7GHz, 0.9GHz, 1.8GHz, 2.6GHz and 4.9GHz, respectively. The antennas designed in this study can be used in LTE, WLAN, RFID, GSM, and Bluetooth bands.
Pan, Po-Yu, i 潘柏宇. "Study of Multiband Monopole Antenna for LTE". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/3jrg8n.
Pełny tekst źródła義守大學
電機工程學系
102
Antenna device needs to be able to send and receive signals in wireless network communications. As technology advances, Mobile band from the early GSM 900/1800 (2G) and now widely used cellphone multimedia transmission UMTS 2100 (3G) and is developing LTE 700/900/1800/2600 (4G). This paper presents the multiband antennas applicable for LTE, this antenna have three- frequency band, the main design principles combined with G-type monopole antenna and L-type monopole antenna, with two different shapes monopole excitation frequency to complete. First, use of G-type monopole antenna structure resonance of 700MHz/1800MHz modal, then by adding L-shaped monopole antenna structure to increase the resonance path length, in addition to produce 2600MHz modal. The design frequency bands are for LTE 700/1800/2600. The simulator HFSS is employed for simulation and results show that 700/1800/2600MHz are included in the band.
Chien, Shih Chieh, i 簡世杰. "Wideband and Multiband Millime-ter-Wave Front-End Circuits". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/45488008294814444352.
Pełny tekst źródła國立清華大學
電機工程學系
103
With the high demands of the high-speed point-to-point communications and real time multimedia streaming, increasing communication standards are proposed at the millimeter-wave band. Fully integrated wideband and multi-band voltage-controlled oscillators (VCOs), low-noise amplifiers (LNAs) and power amplifiers (PAs) have gained momentum in the past few years. However, the designs of the wideband and multi-band front-end circuits are complicated and challenging in order to achieve high performance on the specifications such as the phase noise of the VCO, the noise figure of the LNA and the efficiency of the PA. In this thesis, fundamental of these circuits are first revisited followed by the design methodologies and discussion of five novel works. Two millimeter-wave wideband and multi-band VCOs are introduced with a high order tank, a switch resonator, and digital controlled artificial dielectric (DiCAD) transmission line. A unique architecture with a 4th-order tank in a dual-band input matching network and a bandpass filter with a notch is proposed to achieve a concur-rent dual-band LNA. Finally, two PAs are designed to provide the concurrent du-al-band operation by leveraging a built-in notch of a transformer that couples from adjacent stages.
Lee, Meng-Che, i 李孟哲. "A Novel Method for Multiband Filtering Antenna Design". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/n72zq3.
Pełny tekst źródła國立交通大學
電信工程研究所
103
Filtering antenna is a single component which integrated bandpass filter and antenna in one module to achieve miniaturization and improve performance of microwave front ends. Most of the filtering antenna literatures operate in single band because the method they use is too difficult to design in multiband, especially in wideband. The integration approach they use is to substitute the last resonator and the load impedance of the bandpass filter with an antenna. As there is no literature about triple-band filtering antenna, it is a good topic for worthy discussion. A novel compact triple-band filtering antenna operated at 2.45 / 3.5 / 5.5 GHz with wide bandwidth is proposed in this thesis. We use a different kind of method to design multiband filtering antenna. In order to achieve triple-band filtering antenna, we need to design triple-band bandpass filter first. The proposed triple-band bandpass filter is composed of stepped-impedance resonator (SIR) and uniform-impedance resonator (UIR). Second, we changed the energy direction by using inverted-U shape structure for integrating antenna. Using wide slot fork-shape antenna as our radiator is the key point of this triple-band filtering antenna. This filtering antenna is realized by 33 × 23 mm2. The design of the filtering antenna and the experiment result will be given and discussed in detail in the thesis.
Chen, Weichuan, i 陳韋銓. "Design of Compound Multiband Antenna for Portable Devices". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/65785114206860943501.
Pełny tekst źródła明志科技大學
電子工程研究所
100
In this thesis, we have proposed a compound multiband antenna design for portable devices. The designs are composed of different monopole antenna models to composition small size, simple structure, multi-band operation of the monopole antenna for the mobile devices and USB dongle. The advantages of the proposed antennas overcome the problem of insufficient bandwidth and meet the radiation efficiency of the industry standards. The used designs of compound multiband antennas can cover the wide-band operation of GSM850/900/1800/1900/UMTS and ISM/WiMAX, respectively. Above all, the experimental results show that the radiation efficiencies of the proposed antennas are more than 50% and satisfy the requirements of industry standards.
Wang, Tai-Ming, i 汪泰名. "The Study in Multiband Elliptical-truncated Microstrip Antenna". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/72692904210775834297.
Pełny tekst źródła中華技術學院
飛機系統工程研究所
96
In this thesis, a multiband elliptical patch microstrip antenna that have simple structure and was analyzed and optimized by using the IE3D software is proposed. The proposed antenna uses elliptical metal patch and coupling feed line on the FR4 printed board, in addition to increasing frequencies of antenna and improving whole performance by using shorting ping. It operates at GSM (880–960 MHz)、DCS (1710–1880 MHz)、PCS(1880–1990 MHz)、UMTS (1900–2170 MHz)、WiBro (2300–2390MHz)、Bluetooth (2.4–2.48 GHz).
YANG, YI-YUNG, i 楊義勇. "Multiband antenna designs for applications in smart watches". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/58834346466725631023.
Pełny tekst źródła國立高雄師範大學
光電與通訊工程學系
104
Three novel designs of the multiband antenna designs for applications in smart watches are presented in this thesis. The first proposed antenna has a simple open slot structure excited by a microstrip feedline. The achieved impedance bandwidths of the proposed antenna can cover the Bluetooth/Wi-Fi 2.4 GHz band (2400 ~ 2484 MHz). For the spacing 2 mm between the antenna and wrist, the antenna efficiency is 25% ~ 29%. The second proposed antenna consists of an open slot, a tuning slot and a two-branch microstrip feedline integrated with a chip capacitor. The achieved impedance bandwidths can cover the GPS 1.6 GHz bands (1560 ~ 1610 MHz) and Bluetooth/Wi-Fi 2.4 GHz band. The antenna efficiencies are 21% ~ 27% at 1.6 GHz band and 24% ~ 27% at 2.4 GHz band. As for the third proposed antenna, a triple-branch PIFA is used. The bandwidths of the antenna can cover the GSM900 band (880 ~ 960 MHz), GSM900 band (1710 ~ 1880 MHz), and Bluetooth/Wi-Fi 2.4 GHz band.
Chan, Chao-Kai, i 詹兆凱. "A Coupling Slot Multiband Antenna for Mobile Phones". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/65325308419270386965.
Pełny tekst źródła國立交通大學
電信工程系所
97
A novel internal multiband slot antenna for mobile phone applications is presented. The antenna consists of two L-shaped slots of different lengths cut at the edge of the system ground and added a parasitic strip. It is shown that with a proper design, the two L-shaped slots can generate the operating bandwidths by coupling effect. And the parasitic strip is electromagnetically coupled and excited by the slot to generate the WLAN band. Hence, three elements can separately control the operating frequencies of the three excited resonant modes, which generate the three bands centered at about 900, 2100 and 5200 MHz to cover the GSM/DCS/PCS/UMTS/Bluetooth/WiMAX/WLAN bands. Furthermore, the antenna has a simple planar structure and occupies a small area of 35×22mm2. Good radiation characteristics are obtained over the three operating bands. The design details for the proposed antenna are described, and the experimental results of the antenna performances are presented and discussed.
Wang, Yi-Shiang, i 王奕翔. "Planar Multiband Antenna Designs for Tablet Computer Application". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/58632872871716047666.
Pełny tekst źródła國立高雄海洋科技大學
電訊工程研究所
101
In this dissertation, two internal multiband antenna designs for tablet computer devices are proposed. First, by adding an internal printed loop as the LC matching circuit, the antenna design provides the impedance bandwidths of 262/1610 MHz for the application of LTE/WWAN system. The proposed uniplanar antenna reduces the antenna size by at least 30% since the overall antenna size is only 40 × 15 × 0.8 mm3. Meanwhile, the measured peak gains and antenna efficiencies are about 2.81/4.79 dBi and 79/87 %, respectively. Next, the second antenna design proposes a G-shaped coupled feed structure to obtain the impedance bandwidth of 264/1046 MHz across dual operating bands to meet the specifications of the fourth generation mobile communication system. Furthermore, with more than 40% antenna size reduction, the measured peak gains and antenna efficiencies are about 3.61/5 dBi and 67/67 %, respectively. Additionally, the analysis of the body specific absorption rate (SAR) for two proposed monopole antennas are discussed and less than 1.6 W/kg for 1-g body tissue. Finally, the discussions for MIMO operations of both two proposed antenna designs are presented with good isolation.
Gu, Jiun-Peng, i 辜駿鵬. "An LTE smart mobile antenna with multiband operation". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/36566617569139439907.
Pełny tekst źródła國立臺灣海洋大學
電機工程學系
101
Two kinds of LTE smart mobile antenna with multiband operation are proposed to work in the bands of LTE, GSM, DCS, PCS, PHS, UMTS, Bluetooth, and WLAN. The initial design consists of a three-dimensional meandering monopole antenna constructed on the extended region of the PCB to reduce the space and also acting as the main radiator operating in the bands of LTE, DCS, and PCS, PHS, and UMTS. Subsequently, by adjusting the coupling between the monopole antenna and the shorted stub, the GSM band is added and the impedance matching in the band of LTE is improved. Finally, an additional shorted stub is constructed to radiate in the WLAN. The numerical results show that the -6dB return-loss bandwidths are from 0.7 GHz to 0.985 GHz (0.285 GHz, 34%) for the lower band and from 1.64 GHz to 2.535 GHz (0.895GHz, 43%) for the higher band. The corresponding measured data are from 0.7 GHz to 1.03 GHz (0.33 GHz, 38%) for the lower band and from 1.64 GHz to 2.55 GHz (0.91 GHz, 43%) for the higher band. A second antenna is designed by replacing the coupling stub in the first antenna with a wider one. The wider stub is placed on the top of the substrate so that more space is available on the ground plane, resulting in more suitable application in the mobile device. The numerical results show that the -6dB return-loss bandwidths are from 0.7 GHz to 0.9668 GHz (0.2688 GHz, 27.2%) for the lower band and from 1.5953 GHz to 2.6 GHz (1.0047 GHz, 47%) for the higher band. The corresponding measured data are from 0.688 GHz to 1.03 GHz (0.315 GHz, 39.8%) for the lower band and from 1.61 GHz to 2.65 GHz (1.04 GHz, 48.8%) for the higher band.
Wan, Yu-Chang, i 萬育章. "LTE Multiband Antenna Design for Wireless Network Applications". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/7nrv6y.
Pełny tekst źródła國立臺北科技大學
電子工程系
106
To adapt the trend for the 4G LTE ( 4 Generation Long Term Evolution), this research paper is going to present the antenna for supporting 4G multi-band. Its applied on the wireless router and makes the channel selection more flexible with the WiSprys RF-MEMS technology. Eventually, to execute a system of the MIMO and adjust the high isolation. In this case, antenna is made by the techniques of the FR4 PCB. To meet the requirement from the different telecommunication operators, the author uses CPW-fed Monopole antenna which can apply the LTE Band 28/8/3/7. The traditional antennas generally lose the gains for the bandwidths. In order to overcome that, the author uses WiSprys RF-MEMS technology to make more advantageous Impedance matching. In the measuring results, the operating frequency can actually cover LTE Band 28/8/3/7, that covering the Band of the 4G FDD-LTE. The radiation pattern which is closed to Omni-direction is suitable for the antenna for wireless router. In LTE Band 28, the measured peak radiation gain and efficient are 0.08 dBi and 30 %. In LTE Band 8, the measured peak radiation gain and efficient are 0.57 dBi and 40 %. In LTE Band 3, the measured peak radiation gain and efficient are 1.61 dBi and 50 % and in LTE Band 7, the measured peak radiation gain and efficient are 2.99 dBi and 55%. On the other hand, the calculated results of MIMO system of the envelope correlation coefficient in all of the operating frequency band meet isolation requirement.
謝維庭. "Multiband Antenna for WWAN/LTE Mobile Phone Applications". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/fzfmb3.
Pełny tekst źródła逢甲大學
通訊工程學系
106
This thesis focuses on multi-band antennas for handheld devices including smart phones and tablet computer. There are three antennas proposed in this research. The main structures of the antennas are monopole antenna and slot antenna. The first antenna is a multi-band antenna for smart phone. It can provide LTE 700/2300/2500 (698~787, 2300~2400, 2500~2690 MHz), GSM 850/900/1800/1900 (824~894, 890~960, 1710~1880, 1850~1990 MHz), UMTS 2100 (1920~2170 MHz) and WLAN 2400 (2400~2488 MHz). The antenna consists of three branches monopole antenna and a shorting strip with a matching capacitor. In order to reduce the overall antenna size, a 3-dimensional structure is designed. The volume of the proposed antenna is 70×8×3