Bibliografias temáticas / Polarization reconfigurable

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Literatura científica selecionada sobre o tema "Polarization reconfigurable"

Autor: Grafiati

Publicado: 8 de fevereiro de 2025

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Artigos de revistas sobre o assunto "Polarization reconfigurable"

Bai, Yawen, Pengfei Wang, Bo Peng e Tao Chu. "O-band reconfigurable silicon polarization rotator". Chinese Optics Letters 22, n.º 1 (2024): 011303. http://dx.doi.org/10.3788/col202422.011303.

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Antunes, Filipa, Amélia Ramos, Tiago Varum e João N. Matos. "Concept and Design of a Multi-Polarization Reconfigurable Microstrip Antenna with Symmetrical Biasing Control". Sensors 24, n.º 8 (10 de abril de 2024): 2408. http://dx.doi.org/10.3390/s24082408.

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Wireless communication systems have grown rapidly, moving towards being highly compact, intelligent, and flexible to adapt to changing operating requirements. Multifunctional and highly versatile antennas are key in this development to ensure system quality. Reconfigurable antennas, particularly regarding polarization, allow frequency reuse and enable the mitigation of fading effects. This work presents a square microstrip patch antenna operating in the ISM 5.8 GHz band with reconfigurable polarization by controlling its feeding. This antenna has four different states through the application of a symmetrical DC voltage that controls an RF circuit with PIN diodes. As a result, the microstrip patch can operate with three different polarizations: linear polarization and both circular polarizations (right-handed and left-handed). The antenna was fabricated to validate the proposed concept. The good agreement between the measurement and the simulation results was possible to observe regarding its polarization behaviour, impedance adaptation and radiation pattern.

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Al-Yasir, Yasir, Abdulkareem Abdullah, Naser Ojaroudi Parchin, Raed Abd-Alhameed e James Noras. "A New Polarization-Reconfigurable Antenna for 5G Applications". Electronics 7, n.º 11 (2 de novembro de 2018): 293. http://dx.doi.org/10.3390/electronics7110293.

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This paper presented a new circular polarization reconfigurable antenna for 5G wireless communications. The antenna, containing a semicircular slot, was compact in size and had a good axial ratio and frequency response. Two PIN diode switches controlled the reconfiguration for both the right-hand and left-hand circular polarization. Reconfigurable orthogonal polarizations were achieved by changing the states of the two PIN diode switches, and the reflection coefficient |S11| was maintained, which is a strong benefit of this design. The proposed polarization-reconfigurable antenna was modeled using the Computer Simulation Technology (CST) software. It had a 3.4 GHz resonance frequency in both states of reconfiguration, with a good axial ratio below 1.8 dB, and good gain of 4.8 dBic for both modes of operation. The proposed microstrip antenna was fabricated on an FR-4 substrate with a loss tangent of 0.02, and relative dielectric constant of 4.3. The radiating layer had a maximum size of 18.3 × 18.3 mm2, with 50 Ω coaxial probe feeding.

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Eom, Soon-Young, Ic-Pyo Hong e Jong-Myeon Kim. "Broadband Printed Cross-Dipole Element with Four Polarization Reconfigurations for Mobile Base Station Array Antenna Applications". International Journal of Antennas and Propagation 2011 (2011): 1–10. http://dx.doi.org/10.1155/2011/427015.

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This paper describes a broadband printed cross-dipole element with four polarization reconfigurations (BPCDE_PR). The BPCDE_PR can configure two linear and two circular polarizations in the operating band of 1.7–2.5 GHz. To implement the broadband polarization reconfigurations, switched network type broadband phase shifters are proposed and designed. The fabricated BPCDE_PR prototype with switched network including broadband phase shifters shows good electrical performances and the desired polarization reconfigurable functions in the operating band.

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van Aardt, Ruan, Johan Joubert e Johann W. Odendaal. "A Dipole with Reflector-Backed Active Metasurface for Linear-to-Circular Polarization Reconfigurability". Materials 15, n.º 9 (21 de abril de 2022): 3026. http://dx.doi.org/10.3390/ma15093026.

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In recent years, significant advances have been made in diversifying the capabilities of communication systems by using reconfigurable antennas. There are many types of reconfigurable antennas—to achieve pattern, frequency, or polarization reconfigurability. These antennas are reconfigured either by the mechanical rotation of surfaces or by enabling or disabling specific sections of the structure using electrical switches. This paper focuses on the concept of a polarization reconfigurable antenna based on an active reflector-backed metasurface. An antenna system based on an active reflector-backed metasurface combined with a planar dipole is designed to achieve reconfigurable polarization. The polarization of the designed antenna can be switched between linear and circular polarization states using positive-intrinsic-negative diodes located in the unit cell elements of the metasurface. The measured results correlate well with the simulated results. The antenna has a physical size of 308 × 162 × 35 mm3 with an impedance bandwidth of 4.5% in the linear state and 7% in the circular state, as well as an axial ratio bandwidth larger than 8.3%.

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Yuan, Xianjing, Siyuan Zheng, Binyun Yan e Weixing Sheng. "A Wideband Polarization-Reconfigurable Antenna Based on Fusion of TM10 and Transformed-TM20 Mode". Electronics 13, n.º 18 (22 de setembro de 2024): 3760. http://dx.doi.org/10.3390/electronics13183760.

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A wideband polarization-reconfigurable microstrip antenna based on a mode-fusion mechanism is proposed. This simple antenna structure consists of a rectangular radiation patch and a ground, both with crossed slots. The slots crossing the ground are connected by eight PIN diodes and four capacitors such that two orthogonal linear-polarization radiation modes can be realized. The radiation patch is slotted such that a transformed TM20 mode is excited, realizing broadside radiation that the traditional TM20 mode is unable to. With fusion of the fundamental TM10 mode and the transformed-TM20 (T-TM20) mode, a wide bandwidth of 30.1% is achieved in two reconfigurable polarizations. The measured results agree well with the simulation results. The total efficiency of the proposed antenna is more than 80.0% over the bandwidth.

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Monti, Giuseppina, Laura Corchia e Luciano Tarricone. "PATCH ANTENNA WITH RECONFIGURABLE POLARIZATION". Progress In Electromagnetics Research C 9 (2009): 13–23. http://dx.doi.org/10.2528/pierc09061505.

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Yu Hui-Cun, Cao Xiang-Yu, Gao Jun, Yang Huan-Huan, Han Jiang-Feng, Zhu Xue-Wen e Li Tong. "Broadband reconfigurable reflective polarization convertor". Acta Physica Sinica 67, n.º 22 (2018): 224101. http://dx.doi.org/10.7498/aps.67.20181041.

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Lin, Wei, e Hang Wong. "Wideband Circular Polarization Reconfigurable Antenna". IEEE Transactions on Antennas and Propagation 63, n.º 12 (dezembro de 2015): 5938–44. http://dx.doi.org/10.1109/tap.2015.2489210.

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Hao, Zhang-Cheng, Kui-Kui Fan e Honghui Wang. "A Planar Polarization-Reconfigurable Antenna". IEEE Transactions on Antennas and Propagation 65, n.º 4 (abril de 2017): 1624–32. http://dx.doi.org/10.1109/tap.2017.2670440.

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Mais fontes

Teses / dissertações sobre o assunto "Polarization reconfigurable"

Zaghloul, Yasser A. "Polarization based digital optical representation, gates, and processor". Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43675.

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A complete all-optical-processing polarization-based binary-logic system, by which any logic gate or processor could be implemented, was proposed. Following the new polarization-based representation, a new Orthoparallel processing technique that allows for the creation of all-optical-processing gates that produce a unique output once in a truth table, was developed. This representation allows for the implementation of all basic 16 logic gates, including the NAND and NOR gates that can be used independently to represent any Boolean expression or function. In addition, the concept of a generalized gate is presented, which opens the door for reconfigurable optical processors and programmable optical logic gates. The gates can be cascaded, where the information is always on the laser beam. The polarization of the beam, and not its intensity, carries the information. The new methodology allows for the creation of multiple-input-multiple-output processors that implement, by itself, any Boolean function, such as specialized or non-specialized microprocessors. The Rail Road (RR) architecture for polarization optical processors (POP) is presented. All the control inputs are applied simultaneously, leading to a single time lag, which leads to a very-fast and glitch-immune POP. A simple and easy-to-follow step-by-step design algorithm is provided for the POP, and design reduction methodologies are discussed. The algorithm lends itself systematically to software programming and computer-assisted design. A completely passive optical switch was also proposed. The switch is used to design completely passive optical gates, including the NAND gate, with their operational speeds only bound by the input beams prorogation delay. The design is used to demonstrate various circuits including the RS latch. Experimental data is reported for the NAND and the Universal gate operating with different functionality. A minute error is recorded in different cases, which can be easily eliminated by a more dedicated manufacturing process. Finally, some field applications are discussed and a comparison between all proposed systems and the current semiconductor devices is conducted based on multiple factors, including, speed, lag, and heat generation.

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Balcells, Ventura Jordi. "Radiation pattern reconfigurable microfabricated planar millimeter-wave antennas". Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/32032.

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Els serveis de telecomunicacions i sistemes radar estan migrant a freqüències mil•limètriques (MMW), on es disposa d 'una major amplada de banda i conseqüentment d'una major velocitat de transmissió de dades. Aquesta migració requereix de l'ús de diferents tecnologies amb capacitat d'operar a la banda de freqüències mil•limètriques (30 a 300 Ghz), i més concretament en les bandes Ka (26,5 - 40GHz), V (50 – 75GHz) i W (75 – 110GHz). En moltes aplicacions i sobretot en aquelles on l'antena forma part d'un dispositiu mòbil, es cerca poder utilitzar antenes planes, caracteritzades per tenir unes dimensions reduïdes i un baix cost de fabricació. El conjunt de requeriments es pot resumir en obtenir una antena amb capacitat de reconfigurabilitat i amb un baix nivell de pèrdues en cada una de les bandes de freqüència. Per tal d'afrontar aquests reptes, les dimensions de les antenes mil•limètriques, juntament amb els tipus de materials, toleràncies de fabricació i la capacitat de reconfigurabilitat ens porten a l'ús de processos de microfabricació. L'objectiu d'aquesta tesis doctoral és l'anàlisi dels conceptes mencionats, tipus de materials, geometries de línia de transmissió i interruptors, en el context de les freqüències mil•limètriques, així com la seva aplicació final en dissenys d'antenes compatibles amb els processos de microfabricació. Finalment, com a demostració s'han presentat dissenys específics utilitzables en tres aplicacions a freqüències mil•limètriques: Sistemes de Comunicació per Satèl•lit (SCS) a la banda Ka, Xarxes d'àrea personal inalàmbriques (WPAN) a la banda V i sistemes radar per l'automoció a la banda W. La primera part d'aquesta tesis consisteix en l'anàlisi d'algunes tecnologies circuitals a freqüències mil•limètriques. S'han presentat els materials més utilitzats a altes freqüències (Polytetrafluoroethylene or Teflon (PTFE), Quartz, Benzocyclobuten polymer (BCB) i Low Temperature Co-fired Ceramic (LTCC)) i s'han comparat en termes de permitivitat i tangent de pèrdues. També s'inclou un estudi de pèrdues a altes freqüències en les principals línies de transmissió (microstrip, stripline i CPW). Finalment, es presenta un resum dels interruptors RF-MEMS i es comparen amb els PIN diodes i els FET. En la segona part, es presenten diferents agrupacions d'antenes amb la capacitat de reconfigurar la polarització i la direcció d'apuntament. S'han dissenyat dos elements base reconfigurables en polarització: CPW Patch antena i 4-Qdime antena. La primera antena consisteix en un element singular amb interruptors RF-MEMS, dissenyada per operar a les bandes Ka i V. La segona antena consisteix en una arquitectura composta on la reconfigurabilitat en polarització s'obté mitjançant variant la fase d'alimentació de cada un dels quatre elements lineals. La fase és controlada mitjançant interruptors RF-MEMS ubicats en la xarxa de distribució. L'antena 4-Qdime s'ha dissenyat per operar en les bandes V i W. Ambdós elements base s'han utilitzat posteriorment pel disseny de dues agrupacions d'antenes amb capacitat de reconfigurar l'apuntament del feix principal. La reconfigurabilitat es dur a terme utilitzant desfasadors de fase d'1 bit. La part final de la tesis es centra en les toleràncies de fabricació i en els processo de microfabricació d'agrupacions d'antenes mil•limètriques. Les toleràncies de fabricació s'han estudiat en funció dels error d'amplitud i fase en cada element de l'agrupació, fixant-se en les pèrdues de guany, error d'apuntament, error en l'amplada de feix, errors en el nivell de lòbul secundari i en l'error en la relació axial. El procés de microfabricació de les diferents antenes dissenyades es presenta en detall. Els dissenys de l'antena CPW Patch reconfigurable en polarització i apuntament operant a les bandes Ka i V, s'han fabricat en la sala blanca del Cornell NanoScale Science & Technology Facility (CNF). Posteriorment, s'han caracteritzat l'aïllament i el temps de resposta dels interruptors RF-MEMS, i finalment, el coeficient de reflexió, el diagrama de radiació i la relació axial s'han mesurat a les bandes Ka i V per les antenes configurades en polarització lineal (LP) i circular (CP).
Telecommunication services and radar systems are migrating to Millimeter-wave (MMW) frequencies, where wider bandwidths are available. Such migration requires the use of different technologies with the capability to operate at the MMW frequency band (30 to 300GHz), and more specifically at Ka- (26.5 to 40GHz), V- (50 to 75GHz) and W-band (75 to 110GHz). For many applications and more concretely those where the antenna is part of a mobile device, it is targeted the use of planar antennas for their low profile and low fabrication cost. A wide variety of requirements is translated into a reconfiguration capability and low losses within each application frequency bandwidth. To deal with the mentioned challenges, the MMW antenna dimensions, together with the materials, fabrication tolerances and reconfigurability capability lead to microfabrication processes. The aim of this thesis is the analysis of the mentioned concepts, materials, transmission lines geometries and switches in the MMW frequencies context and their final application in antenna designs compatible with microfabrication. Finally, specific designs are presented as a demonstration for three MMW applications: Satellite Communication Systems (SCS) at Ka-band, Wireless Personal Area Network (WPAN) at V-band and Automotive Radar at W-band. The first part of this thesis consist to analyze some MMW circuit technologies. The four most used materials at MMW frequencies (Polytetrafluoroethylene or Teflon (PTFE), Quartz, Benzocyclobuten polymer (BCB) and Low Temperature Co-fired Ceramic (LTCC)) have been presented and compared in terms of permittivity (εr) and loss tangent (tanδ). An study of the main transmission lines attenuation (microstrip, stripline and CPW) at high frequencies is included. Finally, an overview of the RF-MEMS switches is presented in comparison with PIN diodes and FETS switches. The second part presents different polarization and beam pointing reconfigurable array antennas. Two polarization-reconfigurable base-elements have been designed: CPW Patch antenna and 4-Qdime antenna. The first consists of a single reconfigurable element with integrated RF-MEMS switches, designed to operate at Ka- and V-band. The second antenna presented in this thesis has a composed architecture where the polarization reconfigurability is obtained by switching the phase feeding for each of the four linear polarized elements in the feed network with RF-MEMS switches. The 4-Qdime antenna has been designed to operate at V- and W-band. The two base-elements have been used to design two beam pointing reconfigurable antenna arrays. Using phased array techniques, beamsteering is computed and implemented with 1-bit discrete phase-shifter. The final part of the thesis is focused into the fabrication tolerances and microfabrication process of Millimeter-wave antenna arrays. The fabrication tolerances have been studied as a function of the amplitude and phase errors presented at each elements array, focusing on the gain loss, beam pointing error, Half-Power Beamwidth (HPBW) error, sidelobe level error and axial ratio error. The microfabrication process for the designed antennas is presented in detail. Polarization- and pointing- reconfigurable CPW Patch antenna operating at Ka- and V- band have been fabricated in a clean-room facility at Cornell NanoScale Science & Technology Facility (CNF). The RF-MEMS switches isolation and time response have been characterized. Finally, the reflection coefficient, radiation pattern and axial ratio have been measured at Ka- and V-band for the fabricated antennas configured in Linear Polarization (LP) and Circular Polarization (CP).

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Nikolaou, Symeon. "Design and implementation of compact reconfigurable antennas for UWB and WLAN applications". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/24802.

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Thesis (Ph.D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Manos M. Tentzeris; Committee Co-Chair: John Papapolymerou; Committee Member: Andrew F. Peterson; Committee Member: Chang-Ho Lee; Committee Member: John D. Cressler; Committee Member: Joy Laskar.

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GRASSI, MARANGIONE FULVIO. "Centralized transmission techniques for full-duplex reconfigurable WDM optical access networks". Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/34507.

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This Thesis investigates and develops novel bidirectional and reconfigurable optical access architectures based on WDM technology with the aim of solving the problem of cost and complexity associated to the WDM-PON transceivers. In particular, depending on the capacity requirements of the network, the investigation and development deal with two specific environments of application. In case of low capacity access platforms, we propose and validate new dispersion tolerant optical transmission systems based on the employment of optical broadband sources operating in the third transmission band and whose adaptability to the transport of RoF signals is realized, for the first time, by means of Mach-Zehnder optical interferometer structures. The optical bandpass filtering feature of the Mach-Zehnder device is key to overcome the chromatic dispersion-induced limitations arising from the spectral width of the source and, thus, significantly increase the system operative bandwidth to several tens of GHz. The incorporation of a Mach-Zehnder structure has a relatively low degree of implementation complexity and opens the possibility to transmit RoF signals using cost-effective optical broadband sources in optical access platforms being, at the same time, a viable alternative to other dispersion compensation techniques under certain scenarios. Good RoF transmission performance is experimentally achieved over single mode and multi mode fiber links employing optical amplitude and optical phase modulation. The SCM technique is also used for the generation of down- and up-stream signals to improve the link bandwidth utilization and allow converging transport of wired and wireless services. Service flexibility is demonstrated by means of different types of codification concerning the transmitted binary information. In spectrum sliced optical broadband source multichannel applications, the dynamical assignment of capacity is realized by means of a compact routing scheme based on optical switching and validated over different routing scenarios. Moreover, two extra functionalities offered by the Mach-Zehnder device, such as the photonic suppression of harmonic and intermodulation distortion and the all-optical microwaves generation and up-conversion, are demonstrated. For optical access platforms requiring high capacity transport we propose and validate light sources-centralized optical transmission systems where the PolMUX technique is employed for the first time in the access platform as a novel strategy to minimize the cost and complexity of the terminal units in accordance with the centralization concept. The PolMUX principle uses light polarization as a degree of freedom to efficiently multiplex two orthogonal optical fields at the same wavelength into the same optical channel. Under this principle, the optical carriers required for the down- and uplink transmission can be provided by a single and centralized coherent source. It means that the terminal unit can be kept source-free and operative wavelength-independent. This concept is firstly validated over a single-channel full-duplex optical transmission system adopting RoF and SCM techniques for the generation and transport of the down- and upstream signals. Apart of fulfilling the requirements of quality of transmission after the polarization demultiplexing process, we demonstrate that the tracking and control of polarization can be also centralized at the central office for further minimization of the terminal unit complexity. Finally, the effectiveness of the PolMUX technique is exploited in the access network in order to perform full-duplex multichannel communications where reconfiguration of capacity depending on the actual demand and service convergence, required in RoF, are also demonstrated.
Grassi Marangione, F. (2013). Centralized transmission techniques for full-duplex reconfigurable WDM optical access networks [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/34507
TESIS

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Gokalp, Nihan. "Beam Steerable Meanderline Antenna Using Varactor Diodes And Reconfigurable Antenna Designs By Mems Switches". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609982/index.pdf.

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Recently, reconfigurable antennas have attracted significant interest due to their high adaptation with changing system requirements and environmental conditions. Reconfigurable antennas have the ability to change their radiation pattern, frequency or polarization independently according to the application requirements. In this thesis, three different reconfigurable antenna structures have been designed
beam-steerable meanderline antenna, dual circularly polarized meanderline antenna and dual-frequency slot-dipole array. Traveling wave meanderline antenna arrays are investigated in detail and a beam-steerable traveling wave meanderline antenna array has been introduced for X-band applications. Beam-steering capability of the antenna array has been achieved by loading the antenna elements with varactor diodes. Theoretical analysis and computer simulations of the proposed antenna have been verified with experimental results. Radiation direction of the 8-element meanderline array can be rotated 10°
by changing the varactor diode&rsquo
s bias voltage from 0V up to 20V. Also, a polarization-agile meanderline antenna array has been designed and simulated. Polarization of the circularly polarized meanderline array can be altered between right hand circularly polarized and left hand circularly polarized by using RF MEMS switches. The third type of reconfigurable antenna investigated in this thesis is a dual frequency slot-dipole array operating at X- and Ka-band. Electrical length of the slot dipoles has been tuned by using RF MEMS switches. Antenna prototypes have been manufactured for &lsquo
on&rsquo
and &lsquo
off&rsquo
states of RF MEMS switches and it has been shown that the operating frequency can be changed between 10 GHz and 15.4 GHz.

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Positano, Francesco. "Antennes reconfigurables pour réseaux IoT modernes : principes de conception et stratégies de mise en œuvre". Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ4062.

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La croissance rapide des applications de l’Internet des objets (IoT) a entrainé une forte demande en technologies sans fil avancées. Dans le contexte d’un paysage numérique en constante évolution, les antennes reconfigurables sont devenues un point focal crucial en raison de leur nature adaptable. Ce travail offre un aperçu complet du paysage actuel des technologies IoT et sans fil, en mettant l’accent sur les normes compatibles avec l’IoT et la manière dont elles ont influencé la conception des antennes. Cette recherche explore les défis de la conception, de l’optimisation et de la mise en œuvre de ces antennes spécifiquement pour les réseaux IoT modernes. Les principes fondamentaux des antennes miniatures électriquement petites (ESA) et des conceptions d’antennes reconfigurables pour les applications IoT constituent la base de ce travail. Tout d’abord, l’exploration d’une antenne à polarisation circulaire omnidirectionnelle (OCP) miniature est effectuée, et une analyse approfondie de ses paramètres d’optimisation et de sa polarisation circulaire est réalisée. Une étude sur l’antenne OCP reconfigurable est également fournie, avec un accent sur les stratégies de mise en œuvre pratique. En outre, la recherche explore la reconfigurabilité du diagramme, une caractéristique qui permet à l’antenne de modifier dynamiquement son diagramme de rayonnement. Une antenne à réseau parasitaire orientable électroniquement (ESPAR) reconfigurable et à profil bas est conçu et optimisé, avec présentation et analyse des résultats mesurés. La recherche propose également des solutions potentielles au problème de réoptimisation associé à la mise en œuvre pratique des circuits de commutation. L’étude inclut également des tests sur le terrain en conditions réelles. La conception et les essais sur le terrain d’une antenne ESPAR pour les applications IoT à longue portée basées sur les véhicules aériens sans pilote (UAV) sont discutés, en couvrant l’intégration du transceiver. Enfin, ce travail aborde la conception d’une antenne reconfigurable en fréquence pour les communications IoT basées sur les satellites, avec les défis de la miniaturisation et de la reconfigurabilité au premier plan
The rapid growth of Internet of Things (IoT) applications has led to a surge in demand for advanced wireless technologies.In the context of an ever-evolving digital landscape, reconfigurable antennas have emerged as a pivotal focus due to their adaptive nature.This work provides a comprehensive overview of the current landscape of IoT and wireless technologies, with a focus on the IoT-compliant standards and how they have influenced antenna design. This research explores the challenges of designing, optimizing, and implementing these antennas specifically for modern IoT networks. The fundamental principles of miniature Electrically Small Antennas (ESA)s and reconfigurable antennas designs for IoT applications builds the foundation of this work.Firstly, the exploration of a miniature Omnidirectional Circular Polarization (OCP) antenna, and an in-depth analysis of its optimization parameters and circular polarization is carried out. A study on reconfigurable OCP antenna is also provided, with a stress on practical implementation strategies. Further, the research explores pattern reconfigurability, a feature that allows the antenna to dynamically alter its radiation pattern. A low-profile Pattern Reconfigurable Electronically Steerable Parasitic Array Radiator (ESPAR) is designed and optimized, with measured results presented and analyzed. The research also proposes potential solutions to the re-optimization problem associated with the practical implementation of switching circuits. The study also includes real-life field-testing. The design and on-field testing of an ESPAR antenna for Unmanned Aerial Vehicle (UAV) based long-range IoT applications are thus discussed, covering the integration of the transceiver. Finally, this work discusses the design of a frequency reconfigurable antenna for satellite-based IoT communications, with the challenges of miniaturization and reconfigurability at the forefront

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BALDELLI, MARCO. "Innovative microwave devices for space applications". Doctoral thesis, Università Politecnica delle Marche, 2016. http://hdl.handle.net/11566/243076.

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Gli obiettivi di questo studio sono l'ideazione e il progetto di componenti a microonde innovativi, destinati in particolare alle applicazioni satellitari. Due sfide che i progettisti di queste architetture si trovano attualmente ad affrontare sono la necessità di ridurre peso e volume dei satelliti, e l'introduzione della capacità di riconfigurazione. Entrambi i requisiti puntano alla riduzione dei costi dei payload, e all'estensione della loro vita, intesa come intervallo di tempo durante il quale il payload rimane operativo. Il primo argomento discusso in questa tesi è il progetto di una classe di accoppiatori direzionali a microonde, che permetta la riduzione del peso del satellite fondendo le due reti di beam-forming che alimentano le due polarizzazioni ortogonali delle antenne in una singola struttura sovramodata. Questa classe di componenti è nota in letteratura come a "doppia polarizzazione". Degli accoppiatori a quattro-porte che supportano due polarizzazioni furono già introdotti nel 1997. In questo lavoro, vengono definite delle linee guida di progetto per questi componenti, basato sulla scelta ponderata del tipo di elementi di accoppiamento al fine di garantire un elevato accoppiamento, mantenendo l'isolamento tra le polarizzazioni ortogonali. Al momento della stesura di questo lavoro non sono reperibili, sia nella letteratura internazionale che nelle banche dati dei brevetti, esempi di accoppiatori direzionali a doppia polarizzazione con un numero di porte superiore a quattro. In questa tesi, viene descritto un accoppiatore direzionale a 6 porte, che supporta la doppia polarizzazione. Questo componente innovativo è stato inizialmente progettato con un simulatore elettromagnetico commerciale, ed in seguito ne è stato realizzato un prototipo con il quale sono stati verificati i risultati ottenuti. La seconda parte di questo studio riguarda dei diplexer riconfigurabili, dove la frequenza centrale dei canali può essere posizionata in modo arbitrario, fino al caso limite di canali contigui. Viene descritto e migliorato un prototipo circuitale di diplexer riconfigurabile basato sul concetto di 'dual-manifold' proposto da J. D. Rhodes. Inoltre, tale prototipo circuitale è stato adattato ad una realizzazione fisica in guida d'onda, appropriata per le applicazioni spaziali. Il progetto di questo componente ha richiesto l'introduzione di filtri composti di cavità sovramodate, in particolare cavità cilindriche operanti con il modo TE011, al fine di garantire basse perdite di potenza. Il progetto efficiente di tali strutture si è rivelato un compito impegnativo. Pertanto, questo studio comprende anche la descrizione di una tecnica innovativa per la segmentazione di filtri composti da cavità sovramodate, che può essere impiegata per predire in modo efficiente la risposta finale del filtro, riducendo la complessità delle simulazioni elettromagnetiche richieste. In tal modo, il progetto di queste strutture complesse risulta un compito più semplice.
The aim of this study is the ideation and design of innovative microwave components, particularly suited for satellite applications. Two actual challenges in the design of architectures for this kind of applications are the need to reduce the overall mass of the satellites, and the introduction of reconfigurable capabilities. Both the requirements aim to reduce the costs of the payload, and to extend its lifetime, that is the interval of time the payload remains operative. The first topic covered by this thesis is the design of a class of microwave passive directional couplers, that allows for the reduction of the mass of a satellite by fusing the two beam forming networks feeding each polarization of the double-polarization antennas into a single overmoded structure. This class of components has been referred as "dual-polarization" in the literature. Four-port directional couplers supporting two polarizations were already introduced in 1997. Here, the design guidelines of a dual-polarization directional couplers are defined. The design is based on a judicious choice of the coupling elements in order to guarantee acceptably large coupling and high isolation between orthogonal polarizations. Then, the case of a 6-port directional couplers is considered. No examples of dual-polarization directional couplers with more than 4 ports have been reported so far, both in the international literature and in the patent repositories. In this thesis a 6-port directional coupler working in double polarization is described. The novel component has been designed with commercial full-wave electromagnetical solver, and a prototype has been manufactured and tested. The second topic concerns diplexers whose channel centre frequencies can be arbitrarily positioned, resulting in contiguous and non-contiguous channel spacing. A circuit prototype of tunable diplexers based on the ‘dual-manifold’ concept, proposed by J.D.Rhodes, has been considered and improved. Moreover, the circuital prototype has been adapted to a physical realization in waveguide, suitable for space applications. The design of this component required the introduction of filters made of overmoded cavities, such as circular cavities operating in the TE011 mode, to guarantee low power losses. The efficient design of such structures is a challenging task. Therefore, this study also comprehends the description of a novel technique to segment a filter made of overmoded cylindrical cavities, that can be used to efficiently predict the overall response of the filter. The method reduces the complexity of the full-wave electromagnetic simulation to be performed, thus making easier the design of these complex structures.

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Di, Palma Luca. "Antennes réseaux transmetteur reconfigurables aux fréquences millimétriques". Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S092/document.

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De nombreuses applications civiles et militaires (faisceaux hertziens, futurs réseaux mobiles, communications par satellite, radars automobiles, systèmes d’imagerie haute résolution) nécessitent des antennes à faisceau reconfigurable (dépointage de faisceau, faisceaux multiples, faisceaux formés). Les antennes à réseaux transmetteurs apparaissent comme une alternative aux réseaux phasés classiques ou aux réseaux réflecteurs pour ces applications. L’objectif principal de cette thèse est de démontrer la faisabilité de réseaux reconfigurables fabriqués avec des technologies standards en bande Ka (20-30 GHz). Divers cellules élémentaires utilisant des diodes p-i-n et fonctionnant en polarisation linéaire ou circulaire ont été conçues, optimisées et caractérisées. Les mesures en guide d’onde montrent des pertes minimales de 1,09 dB à 29,0 GHz et une bande passante à 3 dB de 14,7%. Une méthode de simulation hybride a été développée afin d’analyser efficacement des réseaux de grandes dimensions utilisant des rotations séquentielles d’éléments pour optimiser la qualité de polarisation et les diagrammes de rayonnement. Un réseau de 400 cellules élémentaires fonctionnant en polarisation circulaire a été réalisé et testé en chambre anéchoïque. Un dépointage électronique de ±60° et la possibilité de commuter entre les deux polarisations circulaires (droite/gauche) ont été démontrés
Several civil and military applications (hertzian beams, satellite communications, automotive radars, high resolution imaging systems) require antennas with reconfigurable beam capabilities (beam-scanning, beamshaping, multiple beam generation). Transmitarray antennas are good candidates and represent an alternative to classical phased arrays or reflect-arrays for these applications. The main objective of this thesis is to demonstrate the feasibility of reconfigurable transmitarrays fabricated with standard technologies in Ka-band (20-30 GHz). Different unit-cell designs based on p-i-n diodes have been developed to work in linear and circular polarization. Their optimization and experimental characterization have been performed. Waveguide measurements show insertion losses of 1.09 dB at 29.0 GHz with a 3-dB bandwidth of 14.7%. A hybrid simulation technique has been developed in order to analyze efficiently large transmitarrays in which the sequential rotation technique has been applied to optimize the polarization quality and the radiation patterns. A 400-elements transmitarray operating in circular polarization has been realized and tested in anechoic chamber. A beam-scanning angular coverage of ±60° and circular polarization selection (left/right) have been demonstrated

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Bendimerad, Djalal Falih. "Contribution à l'étude et à la mise en oeuvre de fonction de filtrage pour les brasseurs optiques dédiés au traitement multi-longueurs d'onde". Phd thesis, Institut National des Télécommunications, 2012. http://tel.archives-ouvertes.fr/tel-00717600.

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La demande croissante des réseaux optiques actuels en termes de bande passante résulte en un besoin d'exploiter la capacité offerte par la fibre optique. Un des moyens indispensable pour permettre ceci est l'utilisation du multiplexage en longueur d'onde. Il en résulte la nécessité d'utilisation de dispositifs, parmi lesquels le filtre optique, agiles en longueur d'onde et transparents par rapport aux débits. C'est dans ce contexte que notre travail se situe. La technologie utilisée est celle des filtres interférentiels en polarisation. Contraint par un cahier des charges particulier aux applications télécoms, le principal objectif consiste en l'augmentation des performances de ce type de filtre d'une part, et l'association de fonctionnalités additionnelles nécessaires dans les réseaux d'autre part. En utilisant le principe physique des interférences en polarisation, une structure est alors implémentée, suivant les contraintes liées aux trois paramètres majeurs du filtre que sont le contraste, la fonction d'égalisation et la reconfiguration de la bande passante. Par ailleurs, les architectures des filtres optiques diffèrent selon l'emplacement dans le réseau. Ainsi, si une architecture des plus simples est utilisée à la réception, au niveau des nœuds du réseau, celle-ci devient beaucoup plus complexe, s'adaptant à différents degrés de nœuds, et portent le nom de multiplexeurs optiques à insertion/extraction de longueur d'onde (ROADM). Un dispositif de ce type, basé sur les filtres biréfringents, est donc présenté. Une approche système est ensuite menée dans le but de mettre en évidence les avantages et les limitations de la technologie utilisée

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Pham, Trung-Kien. "Étude et conception de réseaux transmetteurs reconfigurables en bande Ka". Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S065.

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Dans les systèmes de communication et de détection sans fil, l'antenne est un élément indispensable pour transformer l'énergie électrique en ondes électromagnétiques rayonnée dans l'espace, et vice versa. Les antennes sont utilisées dans de nombreux dispositifs militaires et civils, tels que les radars (SAR, secteur automobile, détection de débris, etc.), les instruments biomédicaux, les systèmes de télécommunication (téléphones mobiles, stations de base) pour les communications point à multi-point ou point à point par exemple. Les antennes jouent aussi un rôle essentiel pour le développement de futurs réseaux connectés reliant plusieurs appareils à des utilisateurs en temps réel, par exemple pour l'Internet des objets (IoT). Les réseaux transmetteurs sont une solution attrayante pour de nombreuses applications telles que les communications par satellite (Satcom) ou les futurs réseaux 5G. L'architecture des antennes à réseau transmetteur les rend extrêmement compétitifs comparés aux réseaux phasés par exemple grâce à leur alimentation par onde d’espace et car ils ne souffrent pas du blocage induit par la source primaire, comme c’est le cas pour les réseaux réflecteurs ou les antennes à réflecteur. Grâce à leur fonctionnement en mode transmission, les réseaux transmetteurs peuvent être également facilement montés sur des plates-formes mobiles.Les applications Satcom en bande Ka constituent le secteur applicatif majeur de cette thèse. Cette bande fournit un débit de données élevé à la fois pour les liaisons descendantes et les liaisons montantes, en remplacement des systèmes actuels en bande Ku. Dans ce contexte, il convient aussi de prêter une attention particulière aux communications avec des plates-formes mobiles, par exemple les trains à grande vitesse, les avions, etc., ce qui nécessite de mettre au point des antennes à balayage de faisceau. De nombreuses propriétés avancées sont exploitées depuis ces dernières années pour accroître les débits et la flexibilité des systèmes de communication sans fil, par exemple la polarisation circulaire, la double polarisation, le fonctionnement multi-fréquence ou large bande, le dépointage électronique de faisceau. Pour réduire les coûts, des preuves de concept de réseaux transmetteurs non diélectriques sont également proposées. Cette thèse s’est déroulée dans le cadre du projet ANR TRANSMIL (Reconfigurable TRANSmitarrays for beam steering and beam forming at MILlimetre wave). Les objectifs de cette thèse sont de proposer de nouvelles architectures de réseaux transmetteurs fonctionnant en bande Ka en liaison descendante (de 17,7 GHz à 21,2 GHz) et en liaison montante (de 27,5 GHz à 31 GHz). Différents prototypes ont été conçus et fabriqués afin de valider les concepts proposés en bande X et en bande Ka. Un bon accord entre les résultats numériques et mesurés a été obtenu systématiquement. En particulier, les réseaux transmetteurs à double polarisation que nous avons conçus en bande X présentent un gain de 25 dBi et une bande passante à 3 dB de 20% à 10 GHz. Ces propriétés sont indépendantes de la polarisation du champ rayonné, ce qui signifie que des faisceaux de polarisation linéaire orthogonale peuvent être rayonnés indépendamment dans des directions différentes. Un réseau transmetteur bi-bande fonctionnant en bande Ka a également été mis au point. Sa bande passante à 3 dB est de 10% autour des fréquences centrales (19,5 GHz et 29 GHz) et son efficacité de rayonnement atteint 60%. D’autres concepts ont également été étudiés (réseaux transmetteurs sans diélectrique, réseau transmetteur reconfigurable)
Transmitarray is an attractive solution for front-end devices in the next generation of communications (5G). The spatial-fed architecture of transmitarray antennas can compete with phase-arrays due to the absence of feeding network and with reflectarrays since they do not suffer from feed blockage. Thanks to their operation in transmission mode, transmitarrays can be easily mounted on platforms for outdoor environment applications. With mature printed-circuit board technology, there are unstoppable experiments in various frequency bands from cm-wave to mm-wave and up to terahertz in upcoming years for potential applications. Many advanced properties are exploited in transmitarrays in recent years to meet high demands of communications facilities, for example, circular-polarization, dual-/multi-polarization or frequencies through many techniques. Some experiments are consid-ered to validate eligibility of this antenna type in commercial services or military missions, namely electronically steering beam, broad bandwidth, etc. In terms of cost reduction and rigidity, non-dielectric prototypes are also proposed. The Ka-band Satcom applications are the main objective of this thesis through trans-mitarray solution. This band provides high data rate for both down-link and up-link in replacement of the current Ku-band systems with miniaturized module in next dec-ades. Hence, it is worth to pay attention to communications for moving platforms, for example, high-speed trains, planes, etc

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Livros sobre o assunto "Polarization reconfigurable"

Simons, Rainee N. Novel on-wafer radiation pattern measurement technique for MEMS actuator based reconfigurable patch antennas. Cleveland, Ohio: National Aeronautics and Space Administration, Glenn Research Center, 2003.

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Simons, Rainee. Novel on-wafer radiation pattern measurement technique for MEMS actuator based reconfigurable patch antennas. Cleveland, Ohio: National Aeronautics and Space Administration, Glenn Research Center, 2003.

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Capítulos de livros sobre o assunto "Polarization reconfigurable"

Babakhani, Behrouz, e Satish K. Sharma. "Polarization Reconfigurable Antennas". In Multifunctional Antennas and Arrays for Wireless Communication Systems, 122–71. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2021. http://dx.doi.org/10.1002/9781119535096.ch4.

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Bernhard, Jennifer T. "Methods for Achieving Polarization Reconfigurability". In Reconfigurable Antennas, 21–24. Cham: Springer International Publishing, 2007. http://dx.doi.org/10.1007/978-3-031-01535-9_5.

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Shah, Syed Imran Hussain, Shahid Bashir e Slawomir Koziel. "Polarization-Reconfigurable Origami Antennas". In Origami Antennas for Wireless Communication Systems, 95–107. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-53566-6_6.

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Zhu, Weiming, e Ai-Qun Liu. "Reconfigurable Metasurfaces for Dynamic Polarization Control". In Metasurfaces: Towards Tunable and Reconfigurable Meta-devices, 151–67. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6925-6_9.

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Ito, H., Y. Yamamoto e T. Nakagami. "A Polarization-Switched Optically Reconfigurable Interconnection Network". In Photonic Switching II, 200–203. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-76023-5_40.

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Koul, Shiban Kishen, e Rajesh K. Singh. "Polarization Reconfigurable Passive and Active Planar Antennas". In Reconfigurable Active and Passive Planar Antennas for Wireless Communication Systems, 65–101. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6537-1_5.

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Vast, Prachi P., e S. D. Apte. "Reconfigurable Circular Microstrip Patch Antenna with Polarization Diversity". In Proceedings of the International Conference on Data Engineering and Communication Technology, 383–89. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1678-3_37.

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Osman, Mohamed Nasrun, Mohamad Kamal A. Rahim, Mohd Fairus Mohd Yusoff, Mohamad Rijal Hamid, Huda A. Majid, Mohd Ezwan Jalil e Khairul Hilmi Yusof. "A Comparative Study on Polarization Reconfigurable Circular Patch Antenna". In Theory and Applications of Applied Electromagnetics, 339–47. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17269-9_37.

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Al-Yasir, Yasir I. A., Naser Ojaroudi Parchin, Issa Elfergani, Raed A. Abd-Alhameed, James M. Noras, Jonathan Rodriguez, Amar Al-jzari e Waleed I. Hammed. "A New Polarization-Reconfigurable Antenna for 5G Wireless Communications". In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 431–37. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-05195-2_42.

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Usman, Farha, Prakhar Yadav e Ram Suchit Yadav. "Multiband Reconfigurable Antenna Design with Frequency, Polarization and Pattern Diversities". In Proceedings of International Conference on Data Science and Applications, 81–91. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5348-3_6.

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Trabalhos de conferências sobre o assunto "Polarization reconfigurable"

Oliveira, Fúlvio F., Eduardo S. Silveira, Bernardo M. Fabiani, Daniel C. Nascimento e Daniel B. Ferreira. "Dual-Sense Polarization Reconfigurable Phased Array". In 2024 IEEE International Symposium on Antennas and Propagation and INC/USNC‐URSI Radio Science Meeting (AP-S/INC-USNC-URSI), 2251–52. IEEE, 2024. http://dx.doi.org/10.1109/ap-s/inc-usnc-ursi52054.2024.10686985.

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Parihar, Manoj S., A. Basu e S. K. Koul. "Polarization reconfigurable microstrip antenna". In 2009 Asia Pacific Microwave Conference - (APMC 2009). IEEE, 2009. http://dx.doi.org/10.1109/apmc.2009.5384516.

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Zhu, Zhengtao, Liangliang Liu, Zechen Tian, Hui Cong, Haochi Zhang, Changqing Gu e Zhuo Li. "Polarization Reconfigurable Metasurface Retroreflector". In 2023 International Conference on Microwave and Millimeter Wave Technology (ICMMT). IEEE, 2023. http://dx.doi.org/10.1109/icmmt58241.2023.10276613.

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Patriotis, M., F. N. Ayoub, C. G. Christodoulou e S. K. Jayaweera. "Polarization Reconfigurable Circular Patch". In 2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI). IEEE, 2021. http://dx.doi.org/10.1109/aps/ursi47566.2021.9704755.

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Cheung, S. W., C. F. Zhou, Q. L. Li e T. I. Yuk. "A simple polarization-reconfigurable antenna". In 2016 10th European Conference on Antennas and Propagation (EuCAP). IEEE, 2016. http://dx.doi.org/10.1109/eucap.2016.7481801.

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Zhang, Zhehao, Mei Li, Ming-Chun Tang e Xiaoheng Tan. "A Polarization-Reconfigurable Metasurface Antenna". In 2019 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM). IEEE, 2019. http://dx.doi.org/10.1109/iwem.2019.8887909.

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Bales, Kyle A., e Christopher Meagher. "A planar reconfigurable polarization antenna". In 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2013. http://dx.doi.org/10.1109/aps.2013.6711481.

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Qi, Changlong, Yuehui Cui e RongLin Li. "Multi-polarization reconfigurable omnidirectional antenna". In 2017 International Symposium on Antennas and Propagation (ISAP). IEEE, 2017. http://dx.doi.org/10.1109/isanp.2017.8228743.

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Wen-Jiao Liao, Sheng-Jie You e Hsi-Tseng Chou. "Polarization reconfigurable patch array antenna". In 2010 IEEE International Conference on Wireless Information Technology and Systems (ICWITS). IEEE, 2010. http://dx.doi.org/10.1109/icwits.2010.5611973.

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Hassan, Ahsaan Gul, Muhammad Sumaid, Salman Khattak, Fahad Ahmed e Nosherwan Shoaib. "Frequency Reconfigurable Polarization Conversion Metasurface". In 2022 International Conference on IT and Industrial Technologies (ICIT). IEEE, 2022. http://dx.doi.org/10.1109/icit56493.2022.9989176.

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