Relevant bibliographies by topics / Multiple antenna

Academic literature on the topic 'Multiple antenna'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 January 2023

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Journal articles on the topic "Multiple antenna"

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Hidayat, M. Reza, Reza Agung Permana, and Susanto Sambasri. "Konversi Antena Mimo 2x2 Frekuensi 2,4 Ghz Menjadi 5,5 Ghz Menggunakan Patch Bowtie Berbasis Dual Slot Segi Empat dan Single Slot Segitiga." TELKA - Telekomunikasi Elektronika Komputasi dan Kontrol 7, no. 2 (November 22, 2021): 161–73. http://dx.doi.org/10.15575/telka.v7n2.161-173.

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Perkembangan antena radar semakin cepat dan beragam, salah satunya adalah antena MIMO (multiple output). Antena MIMO banyak digunakan untuk teknologi 5G karena efisiensi spectral dan fekuensi yang tinggi. Antena MIMO juga merupakan suatu sistem yang menggunakan multi antena baik pengrim (Transmitter) maupun penerima (receiver) yang bisa mengatasi kelemahan pada sistem komunikasi wireless. Penelitian ini merancang sebuah antena mikrostrip MIMO 2X2 dengan menggunakan patch bowtie untuk mengkonversi frekuensi dari 2,4 GHz menjadi 5,5 GHz dengan menambahkan dual slot segiempat dan single slot segitiga. Hasil simulasi menunjukkan penambahan dual slot segiempat dan single slot segitiga pada patch antena bowtie dapat menggeser frekuensi kerja dari 2,4 GHz menjadi 5,5 GHz. Dari hasil simulasi antena MIMO 2X2 didapatkan nilai return loss S11 sebesar -46,5 dB, insertion loss S21 sebesar -25,2 dB, bandwidth sebesar 192,2 MHz, VSWR sebesar 1,00 dan gain sebesar 3,11 dBi. Hasil dari pengukuran antena MIMO menunjukkan perbedaan dari parameter antena 1 dan 2. Hal ini disebabkan adanya ketidaksamaan ukuran dari antena 1 dan antena 2. Pengukuran nilai return loss untuk antena 1 yaitu sebesar -22,32 dB dan -15,63 dB untuk antena 2. Hasil pengukuran insertion loss antena 1 dan 2 memiliki nilai yang sama yaitu -43,5 dB dan untuk lebar bandwidth memiliki perbedaan nilai yaitu 50 MHz untuk antena 1 dan 100 MHz untuk antena 2. Pengukuran nilai VSWR 1 didapatkan nilai sebesar 1,96, VSWR 2 sebesar 1,41. The development of radar antennas is getting faster and more diverse, one of which is the MIMO (multiple output) antenna. MIMO antennas are widely used for 5G technology because of their high spectral efficiency and frequency. MIMO antenna is also a system that uses multiple antennas, both transmitter and receiver which can solving the weaknesses in wireless communication systems. The research designed a 2X2 MIMO microstrip antenna using a patch bowtie to convert the frequency from 2.4 GHZ to 5.5 GHz by adding dual rectangular slots and single triangular slots. The simulation results show that the addition of dual rectangular slots and single triangular slots on the patch bowtie antenna can shift the working frequency from 2.4 GHz to 5.5 GHz. From the simulation results of MIMO 2X2 antenna, the return loss value of S11 is -46.5 dB, insertion loss S21 is -25.2 dB, bandwidth is 192.2 MHz, VSWR is 1.00 and gain is 3.11 dBi. The results of the MIMO antenna measurements show differences in the parameters of antennas 1 and 2. This is due to the difference size of antenna 1 and antenna 2. The measurement of the return loss value for antenna 1 is -22.32 dB and -15.63 dB for antenna 2 The results of the insertion loss measurements for antennas 1 and 2 have the same value, which is -43.5 dB and for the width of the bandwidth has a different value, 50 MHz for antenna 1 and 100 MHz for antenna 2. Measurement of the value of VSWR 1 obtained a value of 1.96, VSWR 2 is 1.41.
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Dong, P. D. Si, Jennifer Scholz Dicks, and Grace Panganiban. "Distal-less and homothorax regulate multiple targets to pattern the Drosophila antenna." Development 129, no. 8 (April 15, 2002): 1967–74. http://dx.doi.org/10.1242/dev.129.8.1967.

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The Drosophila antenna is a highly derived appendage required for a variety of sensory functions including olfaction and audition. To investigate how this complex structure is patterned, we examine the specific functions of genes required for antenna development. The nuclear factors, Homothorax, Distal-less and Spineless, are each required for particular aspects of antennal fate. Coexpression of Homothorax, necessary for nuclear localization of its ubiquitously expressed partner Extradenticle, with Distal-less is required to establish antenna fate. Here we test which antenna patterning genes are targets of Homothorax, Distal-less and/or Spineless. We report that the antennal expression of dachshund, atonal, spalt, and cut requires Homothorax and/or Distal-less, but not Spineless. We conclude that Distal-less and Homothorax specify antenna fates via regulation of multiple genes. We also report for the first time phenotypic consequences of losing either dachshund or spalt and spalt-related from the antenna. We find that dachshund and spalt/spalt-related are essential for proper joint formation between particular antennal segments. Furthermore, the spalt/spalt-related null antennae are defective in hearing. Hearing defects are also associated with the human diseases Split Hand/Split Foot Malformation and Townes-Brocks Syndrome, which are linked to human homologs of Distal-less and spalt, respectively. We therefore propose that there are significant genetic similarities between the auditory organs of humans and flies.
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Singhwal, Sumer Singh. "Novel Flower-Shaped Multiple Input Multiple Output Dielectric Resonator Antenna." Acta Marisiensis. Seria Technologica 19, no. 1 (May 19, 2022): 9–12. http://dx.doi.org/10.2478/amset-2022-0002.

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Abstract In modern communication systems, dielectric resonator antennas (DRA) play an important role due to its several advantages over contemporary antennas. In this paper, novel flower-shaped multiple input multiple output (MIMO) DRA is proposed for wireless applications in X- band. The proposed antenna with four ports displays more than -15 dB isolation between ports with defected ground technique. The antenna exhibits 7.2-7.5 GHZ impedance bandwidth and 4.66 dBi gain at 7.3 GHz. MIMO performance parameters: Envelope Correlation Coefficient (ECC) and Diversity Gain (DG) of the proposed antenna are also studied and calculated.
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Abdullah, Mujeeb, Saad Hassan Kiani, Lway Faisal Abdulrazak, Amjad Iqbal, M. A. Bashir, Shafiullah Khan, and Sunghwan Kim. "High-Performance Multiple-Input Multiple-Output Antenna System For 5G Mobile Terminals." Electronics 8, no. 10 (September 25, 2019): 1090. http://dx.doi.org/10.3390/electronics8101090.

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In this paper, the systematic design of a multiple antenna system for 5G smartphone operating at 3.5 GHz for multiple-input multiple-output (MIMO) operation in smartphones is proposed. The smartphone is preferred to be lightweight, thin, and attractive, and as a result metal casings have become popular. Using conventional antennas, such as a patch antenna, Inverted-F antennas, or monopole, in proximity to metal casing leads to decreasing its total efficiency and bandwidth. Therefore, a slot antenna embedded in the metal casing can be helpful, with good performance regarding bandwidth and total efficiency. The proposed multiple antenna system adopted the unit open-end slot antenna fed by Inverted-L microstrip with tuning stub. The measured S-parameters results agree fairly with the numerical results. It attains 200 MHz bandwidth at 3.5 GHz with ports isolation of (≤−13 dB) for any two antennas of the system. The influence of the customer’s hand for the proposed multiple antenna system is also considered, and the MIMO channel capacity is computed. The maximum achievable MIMO channel capacity based on the measured result is 31.25 bps/Hz and is about 2.7 times of 2 × 2 MIMO operation.
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M, Vasujadevi, K. Akhil Teja, G. Divya, VV Sai Shanmukh, and K. R Dheeraj. "Fractal Antenna Design for Multiple Applications." International Journal of Engineering & Technology 7, no. 2.7 (March 18, 2018): 602. http://dx.doi.org/10.14419/ijet.v7i2.7.10889.

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The sudden development in in wireless applications has leveled up the use of antennas. Multiband antennas are used to operate at different frequencies for the reliability in various applications. This paper presents design of a novel fractal antenna for multiband applications. Attributes of proposed antenna are simulated using Ansoft HFSS. Due to the homogeneous property in the design of proposed fractal receiving wire it has the various multiband applications. Proposed Antenna design consists of FR4_epoxy material with dielectric constant of 4.4, height 1.6 mm. The operating frequency is taken as 2.4GHz. The antenna is simulated. The proposed antenna resonates at different frequencies. The results are measured and return losses are compared. Here the geometry of fractal antenna is analyzed for the C band resonating at 6.2 GHz, X band resonating at 11.9 GHz and Ku band resonating at 13.8 GHz for S11<-10db.
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Dwairi, Majed Omar, Mohamed Salaheldeen Soliman, Amjad Yousef Hendi, and Ziad AL-Qadi. "The effect of changing the formation of multiple input multiple output antennas on the gain." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 1 (February 1, 2023): 531. http://dx.doi.org/10.11591/ijece.v13i1.pp531-548.

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In this paper, different 2×1 and 2×2 multiple input multiple output (MIMO) antennas were investigated with changing substrate shapes and changing the placing of the patches on the substrate, all the investigated antennas based on FR-4 substrate are characterized by , and loss , with a partial ground. The original antenna covered 3.4 to 13.5 GHz. The best simulation results of the proposed 2×1 MIMO antenna received for 2×1 inverted with high ultra-wideband (UWB) with bandwidth up to 40 GHz, the received maximum gain was up to 6.51 dB, with an average gain of more than the original single antenna at about +1.27 dB. The best of eight 2×2 MIMO antennas configurations that give good results were shown. The best-received gain compared with a single antenna gain were at 4.2 GHz about +2.73, +1.17, and +0.92 dB for plus-shaped, loop, and chair-shaped respectively. A comparison between the proposed MIMO antennas and other reported works were done. The proposed MIMO antennas give a good maximum gain and are suitable for different narrow bands within the UWB such as wireless local area network (WLAN), worldwide interoperability for microwave access (WiMAX), aeronautical radio navigation (ARN), International Telecommunication Union 8-GHz (ITU-8), and X-Band applications with the ability to give high gain without the need to increase the radiated power of the transmitter antenna.
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Wu, Chia-Hao, Jwo-Shiun Sun, and Bo-Shiun Lu. "Watchstrap-Embedded Four-Element Multiple-Input–Multiple-Output Antenna Design for a Smartwatch in 5.2–5.8 GHz Wireless Applications." International Journal of Antennas and Propagation 2018 (2018): 1–16. http://dx.doi.org/10.1155/2018/1905984.

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This paper presents a compact four-element multiple-input–multiple-output (MIMO) antenna design operating within the WiFi 802.11 ac bands (5.2–5.84 GHz) for a smartwatch. The antenna is fabricated using a polyamide substrate and embedded into the strap of a smartwatch model; the strap is created using three-dimensional etching of plastic materials. The four-element MIMO antenna is formed by four monopole antennas, has a simple structure, and is connected to the system ground plane of the smartwatch. Due to the stub and notched block between two antennas and the slit in the system ground, the four-element MIMO antenna exhibits favorable isolation. Moreover, the envelope correlation coefficient of the antennas is considerably lower than 0.005 in the operating band. The measured −6 dB impedance bandwidths of the four elements of the antenna (Ant1–Ant4) with the human wrist encompass the WiFi 802.11 ac range of 5.2–5.84 GHz; moreover, an isolation of more than 20 dB is achieved. The measured antenna efficiency with and without a phantom hand are 45%–55% and 93%–97%, respectively.
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Tan, Ping, Tinaye Hamufari Tsinakwadi, Zhe Xu, and He Xu. "Sing-Ant: RFID Indoor Positioning System Using Single Antenna with Multiple Beams Based on LANDMARC Algorithm." Applied Sciences 12, no. 13 (July 3, 2022): 6751. http://dx.doi.org/10.3390/app12136751.

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RFID localization methods have been widely used in indoor positioning systems (IPS). Most localization techniques involve the use of multiple antennas and the placement of antennas and readers in order to ensure accurate positioning results. However, most localization techniques are complex and require high overhead costs in terms of needing multiple antennas and RFID readers. In this paper, we proposed a method to use a single antenna to perform all the reads and rely rather on the antenna beams to acquire multiple positioning data. A single array of antennas is configured to have multiple angles of operation and rely on different power levels as compared to regular antennas. By manipulating the beam pattern, direction and power, multiple sub-antennas can be conceived and the method utilizes antenna beams and relies mainly on one antenna to realize two-dimensional localization.
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Saini, Mehak, and Surender K. Grewal. "Transmit Antenna Selection Methods For Mimo Systems In Wireless Communications." Journal of University of Shanghai for Science and Technology 23, no. 08 (August 16, 2021): 523–31. http://dx.doi.org/10.51201/jusst/21/08424.

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Though MIMO systems improve performance of a wireless communication network by the usage of multiple antennas, demand of distinct set of RF chain (i.e., electronic components required for antenna transmission and reception, in wireless communication) for all the antennas leads to an increase in complexity and cost. Antenna selection technique of MIMO has proved to be a good means to solve this issue. Antenna Selection methods find optimal number of antennas required out of the total antennas present in the MIMO (Multiple Input Multiple Output) system. The selection of antenna can be performed at both ends of the communication network i.e., transmitter or receiver. In this paper, an overview of various Transmit Antenna Selection techniques for various MIMO systems is presented.
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Wang, Quanxin, Zhongxiang Shen, and Erping Li. "Modal-Expansion Analysis of Multiple Monopole Antennas." International Journal of Antennas and Propagation 2007 (2007): 1–10. http://dx.doi.org/10.1155/2007/76930.

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The modal-expansion method is employed to analyze an array of multiple monopole antennas. A perfectly conducting plate is introduced at the top of the monopole array to facilitate the modal-expansion analysis. Expansion coefficients in the field expressions are found by enforcing continuity conditions of the tangential field components across the regional surfaces. Cylindrical function's addition theorem is employed to realize the transformation of field expressions in different coordinate systems. Numerical results for theS-parameters of a two-monopole antenna are presented and they are in good agreement with experimental ones. Also examined is the effect of the distance between two monopoles on the antenna's mutual coupling and radiation pattern. A four-monopole antenna is studied for its beam-steering capability and simulated results for its radiation properties are compared with those obtained by high frequency structure simulator (HFSS).
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Dissertations / Theses on the topic "Multiple antenna"

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Nair, Sidharth. "A Multiple Antenna Global Positioning System Configuration for Enhanced Performance." Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1090937438.

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Ghosh, Soham. "Compact multiple-antenna structures." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110651.

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Multiple-Input-Multiple-Output (MIMO) communications, which employ multiple antennas at the transmitter and receiver, have become quite ubiquitous today due to its capability to increase the system spectral efficiency and reliability. With the current niche of miniaturization of communication devices, one of the key problems is the design of low-profile multi-antennas. Moreover, when the antenna elements are too close to each other, the inherent problem of mutual coupling can greatly reduce the system capacity. Addressing these two issues at the same time remains an engineering challenge given the spatial constraints inside the device. This thesis investigates antenna miniaturization, mutual coupling reduction and antenna performance characterization for various realistic channel scenarios. Electromagnetic Band-Gap structures are used to reduce the size and mutual coupling of multi-element Microstrip Patch Antennas (MPAs), which can be envisioned to be incorporated in WLAN/LTE base-stations. Furthermore, ultra-miniaturized multi-element Planar Inverted-F Antennas (PIFAs) exploiting pattern and polarization diversity are proposed for receiver terminals, such as a handheld device. The capacity and diversity performance of these multi-antennas have been evaluated in free-space and various fading environments.
Les systèmes de communication à entrée multiple sortie multiple, utilisant plusieurs antennes à l'émetteur et au récepteur, sont devenus omniprésents de nos jours en raison de leur capacité d'augmenter le rendement spectral et la fiabilité du système. Avec le marché de niche actuelle dans la miniaturisation des périphériques de communication, l'un des principaux problèmes est la conception d'antennes multiples avec un profile modéré. De plus, quand les antennes sont trop proche les uns des autres, le problème inné de couplage mutuel peut réduire substantiellement la capacité du système. Trouver une solution qui résout deux problèmes simultanément demeure un défi d'ingénierie compte tenu des contraintes d'espace à l'intérieur des périphériques. Ce mémoire examine la miniaturisation des antennes, la réduction du couplage mutuel, et la caractérisation de la performance des antennes dans divers scénarios avec des voies de transmissions réalistes. Les structures de bande interdite électromagnétique sont utilisées pour réduire les dimensions et le couplage mutuel dans les antennes planaires à microrubans (MPA) multiples. Ces structures peuvent être envisagées pour être incorporées dans les stations de base de technologie d'évolution à long terme (LTE) et de réseau local sans fil (WLAN). De plus, des antennes planaires F inversées (PIFA) ultra-miniatures à éléments multiples qui exploitent les diversités du motif et de la polarisation sont proposées pour les terminaux récepteurs tels que les périphériques de poche. La capacité et la performance de la diversité de ces antennes multiples sont évaluées dans l'espace libre et dans divers environnements d'évanouissement.
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Evans, Daniel N. "Near-Optimal Antenna Design for Multiple Antenna Systems." Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd2796.pdf.

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Zarei, Hossein. "RF variable phase shifters for multiple smart antenna transceivers /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/5964.

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Sandhu, Waseem Hussain, and Muhammad Awais. "MULTIPLE ANTENNA TECHNIQUES IN WiMAX." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-1120.

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Now-a-days wireless networks such as cellular communication have deeply affected human lives and became an essential part of it. The demand to buy high capacity and better performance devices and cellular services has been rapidly increased. There are more than two hundred different countries and almost three billion users all over the world which are using cellular services provided by Global System for Mobile (GSM), Universal Mobile Telecommunication System (UMTS), Wireless Local Area Network (WLAN) and Worldwide Interoperability for Microwave Access (WiMAX). In the past decade, one antenna is connected to only one communication radio device at the same time but currently this scenario has been completely changed. To increase the capacity of the channels and to improve the bit error performance between mobile station and service station, it is now possible to connect one antenna with more than one communication radio device at the same time. Multiple Input Multiple Output (MIMO) systems are designed to obtain this requirement. In MIMO systems, antennas are combined in the form of small frames like coupling in cellular devices. Diversity means to obtain successful transmission and reception of radio signals with accordance to polarization and correlation. Due to diversity the capacity of the channels and bit error rate are improved, so diversity is one of the main and important properties of MIMO systems. This thesis is emphasized to study WiMAX systems by implementing multiple antenna techniques, by observing the bit error rate performance and data rate in WiMAX systems using two important and currently widely applied multiple access communication techniques. The research will also elaborate these techniques and explain the basic parameters, operations, mathematical calculations and different relevant observations. The simulation tool used in this research thesis is MATLAB which is also used to illustrate the results with figures and graphs.
Nu för tiden trådlösa nätverk såsom cellulär kommunikation har stor påverkan på människors liv och blev en viktig del av det. Kravet att köpa hög kapacitet och bättre utrustning prestanda och mobiltelefoni har snabbt ökat. Det finns mer än två hundra olika länder och nästan tre miljarder användare över hela världen som använder mobiltelefoni som Global System for Mobile (GSM), Universal Mobile Telecommunication System (UMTS), Wireless Local Area Network (WLAN) och Worldwide Interoperability för Microwave Access (WiMAX). Under det senaste decenniet har en antenn ansluten till en kommunikationsradio enhet vid samma tidpunkt, men för närvarande detta scenario har fullständigt förändrats. Att öka kapaciteten av kanalerna och för att förbättra prestandan lite fel mellan mobil station och bensinstationen, är det nu möjligt att ansluta en antenn med mer än en kommunikationsradio enhet samtidigt. Multiple Input Multiple Output (MIMO) system är utformade för att uppnå detta krav. I MIMO-system, antenner kombineras i form av små ramar som kopplingsanordningar i cellulär enheter. Mångfald innebär att få lyckad överföring och mottagning av radiosignaler i enlighet med polarisation och korrelation. På grund av mångfalden kapacitet av kanalerna och bit error rate förbättras, så att mångfald är en av de största och viktigaste egenskaper MIMO-system. Denna avhandling är betonas att studera WiMAX system genom att genomföra flera antenn teknik, genom att observera bitars prestanda felfrekvensen och datahastighet i WiMAX system med hjälp av två viktiga och som för närvarande tillämpas allmänt flera tekniker tillgång kommunikation. Forskningen kommer också att utveckla dessa metoder och förklara de grundläggande parametrarna, operationer, matematiska beräkningar och olika relevanta iakttagelser. Den simuleringsverktyg som används i denna forskning avhandling är MATLAB som också används för att illustrera resultaten med siffror och diagram.
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Ray, Siddharth 1979. "Energy efficient multiple antenna communication." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38228.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.
Includes bibliographical references (leaves 111-115).
We consider a multiple-input, multiple-output (MIMO) wideband Rayleigh block fading channel where the channel state is unknown at the transmitter and receiver and there is only an average input power constraint. We compute the capacity and analyze its dependence on coherence length, number of antennas and receive signal-to-noise ratio (SNR) per degree of freedom. We establish conditions on the coherence length and number of antennas for the non-coherent channel to have a "near coherent" performance in the wideband regime. We also propose a signaling scheme that is near-capacity achieving in this regime. We compute the decoding error probability and study its dependence on SNR, number of antennas and coherence length. We show that error probability decays inversely with coherence length and exponentially with the product of the number of transmit and receive antennas. Moreover, in the wideband regime, channel outage dominates error probability and the critical and cut-off rates are much smaller than channel capacity. In the second part of this thesis, we introduce the concept of a fiber aided wireless network architecture (FAWNA), which allows high-speed mobile connectivity by leveraging the speed of optical networks.
(cont.) Specifically, we consider a single-input, multiple-output (SIMO) FAWNA, which consists of a SIMO wireless channel interfaced with an optical fiber channel through wireless-optical interfaces. We propose a design where the received wireless signal at each interface is sampled and quantized before being sent over the fiber. The capacity of our scheme approaches the capacity of the architecture, exponentially with fiber capacity. We also show that for a given fiber capacity, there is an optimal operating wireless bandwidth and number of interfaces. We show that the optimal way to divide the fiber capacity among the interfaces is to ensure that each interface gets enough rate so that its noise is dominated by front end noise rather than by quantizer distortion. We also show that rather than dynamically change rate allocation based on channel state, a less complex, fixed rate allocation scheme can be adopted with very small loss in performance.
by Siddharth Ray.
Ph.D.
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Gopala, Kalyana. "Multiple Antenna Communications for 5G." Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS352.

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Duplexage par division dans le temps (TDD) Massive Multiple Input Multiple Output (MaMIMO) dépend de la réciprocité de canal pour obtenir des informations d'état de canal au niveau de l'émetteur (CSIT). Toutefois, le canal numérique global de bout en bout n’est pas réciproque en raison de la présence de chaînes de transmission (Tx) et de réception (Rx), qui doivent être corrigées à l’aide de facteurs de calibration. Nous fournissons une expression simple et élégante du Cramér-Rao Bound (CRB) pour l’estimation des paramètres de calibration. Nous analysons des approches des moindres carrés existants et proposons des algorithmes optimaux. Nous considérons également la beamforming pour une liaison MIMO point à point variant rapidement dans le temps. Dans un système Orthogonal Frequency Division Multiplexing (OFDM), il en résulte une interférence entre porteuses (ICI). Avec une hypothèse de variation linéaire de canal à travers le symbole OFDM, il a été observé que le problème est similaire à celui d'une conception de beamformer MIMO par canal de diffusion à interférence (IBC). Le design du beamformer prend en compte le fenêtrage de réception en utilisant le préfixe cyclique en excès. En plus de la CSIT complète, nous étudions également des approches qui maximisent le Expected Weighted Sum Rate (EWSR) lorsque la Tx n’a qu’une connaissance partielle du canal. Premièrement, nous utilisons une approximation de système large qui fonctionne également bien pour un petit nombre d’antennes Tx et Rx. Nous analysons également la possibilité d’utiliser la métrique Expected-signal-expected-interference-WSR de signal EWSR. Enfin, les résultats expérimentaux sont présentés
Time Division Duplexing (TDD) Massive Multiple Input Multiple Output (MaMIMO) with a massive number of base station (BS) antennas relies on channel reciprocity to obtain Channel State Information at Transmitter (CSIT). However the overall end to end digital channel is not reciprocal due to the presence of Transmit (Tx) and Receive (Rx) chains which need to be corrected using calibration factors. Our work provides a simple and elegant expression of the Cramer Rao Bound (CRB) for calibration parameter estimation. We provide analysis for the existing least squares approaches and propose optimal algorithms to estimate the calibration parameters. We also consider beamforming for a rapidly time-varying point to point MIMO link. In an Orthogonal Frequency Division Multiplexing (OFDM) sytem, this results in inter-carrier interference (ICI). With an assumption of linear channel variation across the OFDM symbol, it is observed that the beamformer design problem is similar to that of a MIMO Interfering Broadcast Channel (IBC) beamforming design. The beamformer design takes into account receive windowing using the excess cyclic prefix and the window is jointly designed with the Tx beamformer. In addition to full CSIT, we also investigate partial CSIT approaches that maximize Expected Weighted Sum Rate (EWSR) where the Tx has only partial knowledge of the channel. First, we use a large system approximation that also works well for a small number of Tx and Rx antennas to derive the beamformers. In our work, we also analyze the possibility of using the Expected-signal- expected-interference-WSR metric instead of the EWSR. Finally, experimental results on the Eurecom MaMIMO testbed are presented
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Stewart, Scot Howard. "Multiple feed reflector antenna analysis." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/94472.

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A method of calculating the secondary pattern of a reflector illuminated by a feed array is developed. Geometrical optics is used to determine the incident field via a coordinate transformation approach. The incident field from each element is superimposed to form the total field used in finding the surface currents of the physical optics radiation integral. The technique allows each element to be arbitrarily excited, positioned and oriented. The element patterns may be different allowing mutual coupling to be included.
M.S.
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Li, Hui. "Decoupling and Evaluation of Multiple Antenna Systems in Compact MIMO Terminals." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96239.

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Research on multiple antenna systems has been a hot topic in recent years due to the demands for higher transmission rate and more reliable link in rich scattering environment in wireless communications. Using multiple antennas at both the transmitter side and the receiver side increases the channel capacity without additional frequency spectrum and transmitted power. However, due to the limited space at the size-limited terminal devices, the most critical problem in designing multiple antennas is the severe mutual coupling among them. The aim of this thesis is to provide compact, decoupled and efficient multiple antenna designs for terminal devices. At the same time, we propose a simple and cost effective method in multiple antenna measurement. All these efforts contribute to the development of terminal devices for the fourth generation wireless communication. The background and theory of multiple antenna systems are introduced first, in which three operating schemes of multiple antenna systems are discussed. Critical factors influencing the performance of multiple antenna systems are also analyzed in details. To design efficient multiple antenna systems in compact terminals, several decoupling methods, including defected ground plane, current localization, orthogonal polarization and decoupling networks, are proposed. The working mechanism and design procedure of each method are introduced, and their effectiveness is compared. Those methods can be applied to most of the terminal antennas, reducing the mutual coupling by at least 6dB. In some special cases, especially for low frequency bands below 1GHz, the chassis of the device itself radiates like an antenna, which complicates the antenna decoupling. Thus, we extend the general decoupling methods to the cases when the chassis is excited. Based on the characteristic mode analysis, three different solutions are provided, i.e., optimizing antenna locations, localizing antenna currents and creating orthogonal modes. These methods are applied to mobile phones, providing a more reliable link and a higher transmission rate, which are evaluated by diversity gain and channel capacity, respectively. In order to measure the performance of multiple antenna systems, it is necessary to obtain the correlation coefficients. However, the traditional measurement technique, which requires the phase and polarization information of the radiation patterns, is very expensive and time consuming. In this thesis, a more practical and convenient method is proposed. Fairly good accuracy is achieved when it is applied to various kinds of antennas. To design a compact and efficient multiple antenna system, besides the reduction of mutual coupling, the performance of each single antenna is also important. The techniques for antenna reconfiguration are demonstrated. Frequency and pattern reconfigurable antennas are constructed, providing more flexibility to multiple antenna systems.
QC 20120604
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Mukherjee, Souvick. "Multiple antenna microwave ablation: impact of non-parallel antenna insertion." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/19058.

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Master of Science
Department of Electrical and Computer Engineering
Punit Prakash
Microwave ablation is a minimally invasive therapeutic modality used for the treatment of cancer in various organs. In this procedure, microwave energy is sent through a thin antenna placed inside the tumor. The microwave energy radiated from the antenna generates heat which kills the tumor cells by necrosis. During multiple-applicator microwave ablation, geometric estimates of treatment outcome are typically obtained by assuming parallel insertion of the applicators. This assumption is based on the guidelines provided in the brochures of antenna manufacturing companies. This assumption is flawed because it is rare to insert the antennas in parallel configuration due to the flexible nature of the antennas and the presence of intervening organs. Furthermore, movement of patients during the treatment procedure alters the position of the antennas. In order to see the effect of non-parallel insertion of antennas, model-based treatment planning may be instructive. Treatment planning can also determine the changes needed to be made for prospective ablation therapy if the antennas are not positioned in their ideal parallel configuration. This thesis provides a detailed computational comparison of the skewed configurations of microwave antennas to their closest parallel configurations. The metric used for com-paring the similarity between the cases is Dice Similarity Coefficient (DSC). Experimental results to validate the computational data are also discussed. Computations were done by using realistic cases of antenna positions obtained from Rhode Island Hospital.
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Books on the topic "Multiple antenna"

1

Wireless communications over MIMO channels: Applications to CDMA and multiple antenna systems. Chichester, England: John Wiley & Sons, 2006.

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Muth, Lorant A. A theory of mutual impedances and multiple reflections in an N-element array environment. Washington, D.C: National Bureau of Standards, 1985.

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Földes, Péter. A design study for the use of a multiple aperture deployable antenna for soil moisture remote senisng satellite applications. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1986.

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Manning, Robert Michael. Space communication link propagation data for selected cities within the multiple beam and steerable antenna coverage areas of the Advanced Communications Technology Satellite. [Washington, DC]: National Aeronautics and Space Administration, 1988.

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Tucker, Randall Jay. Coupling losses in multiple beam antennas. Monterey, Calif: Naval Postgraduate School, 1992.

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Costa, Nelson. Multiple-input multiple-output channel models: Theory and practice. Hoboken, N.J: Wiley, 2010.

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Biglieri, Ezio. Transmission and reception with multiple antennas: Theoretical foundations. Hanover, MA: Now, 2004.

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Simons, Rainee N. Spatial frequency multiplier with active linearly tapered slot antenna array. [Washington, DC: National Aeronautics and Space Administration, 1994.

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Lau, Vincent K. N., and Yu-Kwong Ricky Kwok. Channel-Adaptive Technologies and Cross-Layer Designs for Wireless Systems with Multiple Antennas. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/0471774065.

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Channel-Adaptive Technologies and Cross-Layer Designs for Wireless Systems with Multiple Antennas. New York: John Wiley & Sons, Ltd., 2006.

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Book chapters on the topic "Multiple antenna"

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Dziunikowski, W. "Multiple-Input Multiple-Output (MIMO) Antenna Systems." In Adaptive Antenna Arrays, 259–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05592-2_15.

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Sälzer, Thomas, David Gesbert, Cornelius van Rensburg, Filippo Tosato, Florian Kaltenberger, and Tetsushi Abe. "Multiple Antenna Techniques." In LTE - The UMTS Long Term Evolution, 249–77. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9780470978504.ch11.

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Morais, Douglas H. "Multiple Antenna Techniques." In Key 5G Physical Layer Technologies, 169–96. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51441-9_8.

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Prasad, Ramjee, and Fernando J. Velez. "Multiple Antenna Technology." In WiMAX Networks, 423–50. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-8752-2_11.

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Ergen, Mustafa. "Multiple Antenna Systems." In Mobile Broadband, 221–60. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-68192-4_6.

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Morais, Douglas H. "Multiple Antenna Techniques." In Key 5G Physical Layer Technologies, 191–220. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89209-8_8.

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Blair, David, Sergio Frasca, and Guido Pizzella. "Gravnet, Multiple Antenna Coincidences and Antenna Patterns For Resonant Bar Antennas." In Gravitational Wave Data Analysis, 285–98. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1185-7_21.

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Ramiro-Moreno, Juan, Lars T. Berger, Laurent Schumacher, and Troels B. Sørensen. "Multiple Antenna Processing and Performance in WCDMA." In Adaptive Antenna Arrays, 568–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05592-2_32.

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Bhat, Anup P., Sanjay J. Dhoble, and Kishor G. Rewatkar. "Multiple-Input Multiple-Output Antenna Design and Applications." In Microstrip Antenna Design for Wireless Applications, 99–144. New York: CRC Press, 2021. http://dx.doi.org/10.1201/9781003093558-11.

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Zhao, Zhongyuan, Mugen Peng, Li Wang, Wenqi Cai, Yong Li, and Hsiao-Hwa Chen. "Antenna Selection in Large-Scale Multiple Antenna Systems." In Wireless Algorithms, Systems, and Applications, 756–66. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21837-3_74.

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Conference papers on the topic "Multiple antenna"

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James, Sagil, Shubham Birar, Riken Parekh, Kushal Jain, and Kiran George. "Preliminary Study on Fractal-Based Monopole Antenna Fabricated Using 3D Polymer Printing and Selective Electrodeposition Process." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2901.

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Abstract Modern wireless communication industries need high performance antennas having better connectivity, ultra-wide bandwidth, lightweight and miniaturized. The current design and manufacturing process for antennas have several limitations. This study aims to address some of the limitations of designing and fabricating modern radio frequency wireless antennas. The study proposes a combination of fractal-based monopole antenna design followed by fabrication using additive manufacturing and selective electrochemical deposition process. Multiple designs of monopole antennas are compared, and the performance testing showed that the three-dimensional fractal-based antenna design showed the highest performance. The results of this study would be extremely crucial for overcoming challenges of modern antenna technologies.
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Shah, Hamil, Abdullahi Inshaar, Chengzhe Zou, Shreyas Chaudhari, Saad Alharbi, Asimina Kiourti, and Ryan L. Harne. "Multiphysics Modeling and Experimental Validation of Reconfigurable, E-Textile Origami Antennas." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85603.

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Physical deformation mechanisms are emerging as compelling and simple ways to adapt radio frequency (RF) characteristics of antennas in contrast to digital steering approaches acting on topologically fixed antennas. Concepts of physical reconfigurability also enable exceptional capabilities such as deployable and morphing antenna arrays that serve multiple functions and permit compact transport with ease. Yet, the emergent concepts lack broad understanding of effective approaches to integrate conformal, electrically conductive architectures with high-compliance foldable frameworks. To explore this essential interface where electrical demands and mechanical requirements may conflict, this research introduces a new class of origami-based tessellated antennas whose RF characteristics are self-tuned by physical reconfiguration of the antenna shape. E-textile materials are used to permit large antenna shape change while maintaining electrical conductivity. Dipole and patch antennas are considered as conventional antenna platforms upon which to innovate with the e-textile origami concept. Multiphysics modeling efforts establish the efficacy of foldable antenna geometries for broad tailoring of the RF characteristics. Experiments with proof-of-concept antennas confirm the large adaptability of wave radiation properties enabled by the reconfiguration of the e-textile origami surfaces. The results suggest that e-textile antennas can be integrated into clothing and mechanical structures, providing a non-invasive way of quantifying deformation for a wide range of applications.
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Broyde, Frederic, and Evelyne Clavelier. "A new multiple-antenna-port and multiple-user-port antenna tuner." In 2015 IEEE Radio and Wireless Symposium (RWS). IEEE, 2015. http://dx.doi.org/10.1109/rws.2015.7129728.

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Volakis, John L., Gil-Young Lee, Dimitris Psychoudakis, and Chi-Chih Chen. "Multiple body-worn antenna diversity." In 2009 IEEE International Workshop on Antenna Technology "Small Antennas and Novel Metamaterials" (iWAT). IEEE, 2009. http://dx.doi.org/10.1109/iwat.2009.4906965.

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Landeau, Thomas, Onofrio Losito, Giuseppe Palma, Vincenza Portosi, Alain Jouanneaux, and Franceso Prudenzano. "Multiple rhombus monopole antenna." In 2015 German Microwave Conference (GeMiC). IEEE, 2015. http://dx.doi.org/10.1109/gemic.2015.7107829.

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Brou, William-Fabrice, Duong Quang Thang, and Minoru Okada. "Multiple-input multiple-output dynamic charging using multiple parallel line feeders." In 2016 International Workshop on Antenna Technology (iWAT). IEEE, 2016. http://dx.doi.org/10.1109/iwat.2016.7434837.

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Tak, Jinpil, Adnan Kantemur, and Hao Xin. "A Reconfigurable UWB Multiple-Input Multiple-Output Antenna." In 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2018. http://dx.doi.org/10.1109/apusncursinrsm.2018.8609095.

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Lee, Changhee, Eunsung Park, and Inkyu Lee. "Antenna Placement Designs for Distributed Antenna Systems with Multiple-Antenna Ports." In 2012 IEEE Vehicular Technology Conference (VTC Fall). IEEE, 2012. http://dx.doi.org/10.1109/vtcfall.2012.6398923.

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Bhardwaj, Ram Prakash, Vinod Kumar, and Charanjeet Singh. "Multiple antenna techniques in WiMax." In the 2011 International Conference. New York, New York, USA: ACM Press, 2011. http://dx.doi.org/10.1145/1947940.1947951.

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Yan Li, Xia Zhu, and Liangliang Hu. "General multiple antenna evaluation platform." In IEE Mobility Conference 2005. The Second International Conference on Mobile Technology, Applications and Systems. IEEE, 2005. http://dx.doi.org/10.1109/mtas.2005.207154.

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Reports on the topic "Multiple antenna"

1

Carter, M. D., D. B. Batchelor, and E. F. Jaeger. Multiple Antenna Implementation System (MAntIS). Office of Scientific and Technical Information (OSTI), January 1993. http://dx.doi.org/10.2172/10146649.

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Carter, M. D., D. B. Batchelor, and E. F. Jaeger. Multiple Antenna Implementation System (MAntIS). Office of Scientific and Technical Information (OSTI), January 1993. http://dx.doi.org/10.2172/6492877.

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Chen, Biao. Advanced Multiple In-Multiple Out (MIMO) Antenna Communications for Airborne Networks. Fort Belvoir, VA: Defense Technical Information Center, March 2015. http://dx.doi.org/10.21236/ada621897.

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Huang, Haiying. Quantification of Multiple Cracks Using MM-wave Antenna Sensor Network. Fort Belvoir, VA: Defense Technical Information Center, October 2011. http://dx.doi.org/10.21236/ada563782.

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Paulraj, Arogyaswami J. Multiple Antenna Communication With Time Reversal Mirror (MIMO-TRM) Pre-Processing. Fort Belvoir, VA: Defense Technical Information Center, September 2004. http://dx.doi.org/10.21236/ada426625.

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Bernhard, Jennifer T. Enabling Technology for Multiple Input Multiple Output (MIMO) Systems on Mobile Military Platforms: Antennas, Switches, and Packaging. Fort Belvoir, VA: Defense Technical Information Center, May 2011. http://dx.doi.org/10.21236/ada544844.

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