Gotowe bibliografie tematyczne / Adaptive antennas

Gotowa bibliografia na temat „Adaptive antennas”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 28 lipca 2024

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Artykuły w czasopismach na temat "Adaptive antennas"

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Bansal, Preeti, i Nidhi Chahal. "Smart Antennas for Various Applications". CGC International Journal of Contemporary Technology and Research 4, nr 2 (5.08.2022): 316–18. http://dx.doi.org/10.46860/cgcijctr.2022.07.31.316.

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The paper presents about smart antennas for advancement in wireless and mobile communication. Smart antennas also called adaptive array antennas with better signal processing & can be used to calculate beam forming vectors which helps in tracking & locating antenna beam of target. Smart antennas are helpful in health monitoring in covid-19 pandemic and provides better service quality. Smart antenna is one of the rising innovations which can satisfy the prerequisites. Smart antennas are being used for controlling, monitoring and analyzing real time systems for various applications In smart antennas spatial division of the signal is used as compared to spectrum division, it can be beneficial for improving the performance of wireless communication. This paper describes how switched beam & adaptive array antennas differ from basic antennas.
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Wang, Chaowei, Weidong Wang, Cheng Wang, Shuai Wang i Yang Yu. "A Fast Adaptive Receive Antenna Selection Method in MIMO System". International Journal of Antennas and Propagation 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/175783.

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Antenna selection has been regarded as an effective method to acquire the diversity benefits of multiple antennas while potentially reduce hardware costs. This paper focuses on receive antenna selection. According to the proportion between the numbers of total receive antennas and selected antennas and the influence of each antenna on system capacity, we propose a fast adaptive antenna selection algorithm for wireless multiple-input multiple-output (MIMO) systems. Mathematical analysis and numerical results show that our algorithm significantly reduces the computational complexity and memory requirement and achieves considerable system capacity gain compared with the optimal selection technique in the same time.
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M. Africa, Aaron Don, Rica Rizabel M. Tagabuhin i Jan Jayson S. D. Tirados. "Design and simulation of an adaptive beam smart antenna using MATLAB". Indonesian Journal of Electrical Engineering and Computer Science 21, nr 3 (10.03.2021): 1584. http://dx.doi.org/10.11591/ijeecs.v21.i3.pp1584-1593.

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<span id="docs-internal-guid-ad3b6b0d-7fff-2d92-685e-3d423ac2713f"><span>Signals transmitted over a long range of distance may pass through several obstacles and scatter, taking multiple paths to reach the receiver. Beamforming antennas are controlled electronically to adjust the radiation pattern following the first received signal. This allows the antenna to maximize the received signal and consequently, suppress the interfering signals received. A smart antenna should be able to diminish noise, increase the signal to noise ratio, and have better system competence. The adaptive beam makes use of the spacing of the several antennas and the phase of the signal of each antenna array to control the shape and direction of the signal beam. This paper focuses on the use of smart antennas using an adaptive beam method as a better system for the transmission of signals. A simulation between the existing Omnidirectional antenna system and the smart antenna system will be made and compared. The paper will discuss the corresponding advantages that a smart antenna system has compared to the Omnidirectional antenna system.</span></span>
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Rajitha, Datla, i Godi Karunakar. "Effect of chaos factor in radiation pattern in planner antenna arrays with chaos adaptive invasive weed optimization". Indonesian Journal of Electrical Engineering and Computer Science 27, nr 2 (1.08.2022): 692. http://dx.doi.org/10.11591/ijeecs.v27.i2.pp692-700.

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For mobile <span>communication and spatial detection of antennas should have high directive radiation pattern, in this context pattern synthesis of planar circular antenna arrays is highly significant such design has been done inverse weed optimization. The basic objective e is to study invasive weed optimization in compression with modified chaotic adaptive invasive weed optimization. The focus of the study is the effect of chaotic factors suitable for sinusoidal mapping for chaos as applicable to the context of the design of antennas. Taking various numbers of elements of the antenna and the distance between the antenna’s radiation patterns are studied by varying chaos factors through MATLAB programming. It is found that the critical point of 2.3 for chaos factor makes the map enter into phase of chaos prior to the critical point is a phase of periodicity starting with chaos factor of 2. Below this value there is no chaos but a phase of convergence. These phases are useful having a trade of convergence and chaos. By varying the factor of chaos the impact on the radiation factor of non-uniform planar antennas has been found to give phases of convergence of chaos which are essential for making trade of between exploitation and exploration required in optimization.</span>
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Ojaroudi Parchin, Naser, Haleh Jahanbakhsh Basherlou, Yasir Al-Yasir, Raed Abd-Alhameed, Ahmed Abdulkhaleq i James Noras. "Recent Developments of Reconfigurable Antennas for Current and Future Wireless Communication Systems". Electronics 8, nr 2 (26.01.2019): 128. http://dx.doi.org/10.3390/electronics8020128.

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Reconfigurable antennas play important roles in smart and adaptive systems and are the subject of many research studies. They offer several advantages such as multifunctional capabilities, minimized volume requirements, low front-end processing efforts with no need for a filtering element, good isolation, and sufficient out-of-band rejection; these make them well suited for use in wireless applications such as fourth generation (4G) and fifth generation (5G) mobile terminals. With the use of active materials such as microelectromechanical systems (MEMS), varactor or p-i-n (PIN) diodes, an antenna’s characteristics can be changed through altering the current flow on the antenna structure. If an antenna is to be reconfigurable into many different states, it needs to have an adequate number of active elements. However, a large number of high-quality active elements increases cost, and necessitates complex biasing networks and control circuitry. We review some recently proposed reconfigurable antenna designs suitable for use in wireless communications such as cognitive-ratio (CR), multiple-input multiple-output (MIMO), ultra-wideband (UWB), and 4G/5G mobile terminals. Several examples of antennas with different reconfigurability functions are analyzed and their performances are compared. Characteristics and fundamental properties of reconfigurable antennas with single and multiple reconfigurability modes are investigated.
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Maruti Rajaram Jadhav, Maruti Rajaram Jadhav. "Navigating The Complexity Overcoming Mobility Obstacles in Massive MIMO Systems with MIMO Antennas." International Journal on Recent and Innovation Trends in Computing and Communication 11, nr 9 (30.11.2023): 4912–21. http://dx.doi.org/10.17762/ijritcc.v11i9.10087.

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This research investigates the synergy between Massive Multiple Input, Multiple Output (MIMO) systems and mobility challenges, with a focus on the pivotal role played by Multiple Antenna Systems (MIMO antennas). Employing a sophisticated experimental setup featuring a 3.5 GHz Massive MIMO base station equipped with 64 MIMO antennas, mobile terminals on motorized platforms, and advanced RF measurement tools, the study explores adaptive beamforming, spatial multiplexing, and diversity techniques. Results from 100 experiments, each lasting 10 minutes, reveal that adaptive beamforming dynamically improves user tracking in response to mobility-induced channel variations. Spatial multiplexing and diversity techniques enhance throughput and reliability, especially in high user mobility scenarios. The quantitative findings align with existing literature, providing practical insights for the deployment of MIMO antennas. The study addresses limitations and proposes avenues for future research, enhancing our understanding of MIMO antenna applications and contributing to the evolution of wireless communication technologies in dynamic environments.
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Easa,, Haider, Musa Wali i Adheed Sallomi. "Cellular Networks Pollution Reduction". Al-Kitab Journal for Pure Sciences 2, nr 2 (30.12.2018): 84–95. http://dx.doi.org/10.32441/kjps.02.02.p6.

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The potential of adaptive antennas to optimize the wireless network performance make it one of the promising technologies that can face the increased demand for wireless communications services with the limited available bandwidth. Adaptive antennas have the ability to steer their main lobe in the direction of interest and placing nulls in the direction of interference. This can result in co-channel interference minimization, maximizing Signal to Interference Ratio (SIR) and then improve the receiver sensitivity. In this paper, the base-station sensitivity improvement and its effect on the mobile transmit power were investigated at different scenarios. Results show that using adaptive antenna yields in RF pollution reduction.
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Wnuk, Marian. "Adaptive Antenna Array Control Algorithm in Radiocommunication Systems". Algorithms 17, nr 2 (14.02.2024): 81. http://dx.doi.org/10.3390/a17020081.

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An important element of modern telecommunications is wireless radio networks, which enable mobile subscribers to access wireless networks. The cell area is divided into independent sectors served by directional antennas. As the number of mobile network subscribers served by a single base station increases, the problem of interference related to the operation of the radio link increases. To minimize the disadvantages of omnidirectional antennas, base stations use antennas with directional radiation characteristics. This solution allows you to optimize the operating conditions of the mobile network in terms of reducing the impact of interference, better managing the frequency spectrum and improving the energy efficiency of the system. The work presents an adaptive antenna algorithm used in mobile telephony. The principle of operation of adaptive systems, the properties of their elements and the configurations in which they are used in practice are described. On this basis, an algorithm for controlling the radiation characteristics of adaptive antennas is presented. The control is carried out using a microprocessor system. The simulation model is described. An algorithm was developed based on the Mathcad mathematical program, and the simulation results of this algorithm, i.e., changes in radiation characteristics as a result of changing the mobile position of subscribers, were presented in the form of selected radiation characteristics charts.
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Africa, Aaron Don Munsayac, Benjamin Emmanuel Uy i Bianca Clarisse Tan. "Simulations on the effects of an optimized bowtie dipole antenna with an adaptive FIR filter". Bulletin of Electrical Engineering and Informatics 12, nr 3 (1.06.2023): 1550–59. http://dx.doi.org/10.11591/eei.v12i3.4406.

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In the evolution of technology through the years, antennas are use in varying wireless systems have been in demand. Antennas play a great role in transmitting and receiving signals. As its application is heavily used in many days to day activities, it is important to create a cost-efficient and quick way to analyze its performance, characteristics, and relationship to different variables. As many radiation pattern acquisition devices are expensive, this simulation proposes a quick, reliable, and cost-friendly way to simulate 2D patterns in the E-plane and H-plane of a bowtie dipole antenna with an adaptive finite impulse response (FIR) filter. Through this study, the software MATLAB will be utilized to successfully simulate the radiation patterns of antennas with varying lengths. With the use of MATLAB toolboxes, the researchers aim to be able to compare different antenna lengths and determine the relationship and effect of it in the obtained 2D radiation pattern. If this method is successful various antenna applications may be implemented in the future with the use of 2D radiation pattern results.
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So, Hideya, Kouhei Suzaki i Daisuke Goto. "Undesired Radiation Suppression Technique with Adaptive Control for Distributed Array Antenna Systems in Mobile Environment". Journal of communications software and systems 16, nr 2 (11.05.2020): 163–69. http://dx.doi.org/10.24138/jcomss.v16i2.1044.

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We have proposed a distributed array antenna (DAA) system for high-speed satellite communications. The DAA system uses multiple small tracking antennas and combines the transmission signals in-phase to increase the antenna gain. DAA system has a problem that the undesired radiation at the sidelobe direction increases as the antenna gain at the main lobe direction increases. In the mobile environment, the conventional technique can suppress the undesired radiation in the limited condition because of changing the direction of the undesired radiation according to the movement of the mobile station. This paper proposes a DAA technique that suppresses the undesired radiation by setting a transmission plate at each antenna aperture and moving them via adaptive control. The transmission plate consisting of a metal patch or slot retransmits electromagnetic waves and changes the amplitude and phase of the waves. To change the radiation patters of each antenna, the transmission plate rotates according to movement of the mobile station. After combining these changed signals, the adaptive control selects the rotate angle of the transmission plate to decrease the undesired radiation at the sidelobe direction. The antenna gain on the main lobe direction after combining is achieved with lower loss because the insertion loss through the transmission plate is smaller. The proposed technique offers more than $2.4$ dB improvement with three antennas and more than $3.5$ dB improvement with four antennas assuming each consists of $8 ¥times 8$ patches.
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Rozprawy doktorskie na temat "Adaptive antennas"

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Hwang, Seung-Hyeon. "Adaptive antenna techniques for smart antennas and radar systems". Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2005. http://wwwlib.umi.com/cr/syr/main.

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Bustamante, Roberto M. "Adaptive multiple beam antennas". Thesis, University of Surrey, 1986. http://epubs.surrey.ac.uk/842903/.

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This work assesses the performance of reflector antennas under adaptive control. In this study, a conventional reflector antenna is given adaptive control by placing additional feeds in the reflector focal plane. The antenna effectively becomes a Multiple Beam Antenna (MBA). This configuration has received far less attention than the Sidelobe Canceller which achieves spatial discrimination by placing low gain elements in the periphery of the reflector. The applications that motivate this work involve rotating radar antennas subject to main beam interference or multiple targets that must be resolved within a 3-db beamwidth. The possibility of the interference being correlated with the wanted signal is also considered. Within the context of these applications the assessment addresses: The basic (main-beam and sidelobe) cancellation performance of this type of antenna. The influence of beam characteristics such as crossover levels, gain, sidelobe levels, etc. in performance. The Control Laws that avoid cancellation of a wanted signal while rejecting interference even if knowledge in signal direction is only approximate. Algorithms to solve adaptively the above Control Laws at speeds consistent with rotating antennas and rapidly changing interference. The use of the beamformer output to generate a reference signal to avoid cancellation of the wanted signal. An algorithm, so far used in the frequency domain, applied in this work to the space domain with the purpose of avoiding cancellation of the wanted signal in the presence of correlated interference such as multipath. The construction of an experimental antenna is also undertaken and it is demonstrated that adaptive nulling is readily achieved in practice.
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Schlub, Robert Walter, i n/a. "Practical Realization of Switched and Adaptive Parasitic Monopole Radiating Structures". Griffith University. School of Microelectronic Engineering, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040610.112148.

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Switched and adaptive parasitic monopole array radiating structures are investigated. Antenna design is orientated toward increasing practicability for implementation in terrestrial wireless communication systems. A number of antennas are designed with the aid of optimization and commercial simulation software. Simulation procedure was verified with the experimental manufacture and measurement of the arrays. The antennas presented in this thesis comprise an active monopole surrounded by a ring of parasitic monopoles. Parasitic radiators are constructed with static loading to enable simple experimental realization. Beam positions of an electrically steered equivalent antenna are thus simulated. Antenna symmetry ensures the beam can be reproduced throughout the azimuth. Complex antenna geometries require antenna design through optimization. A genetic algorithm is employed with HFSS and NEC for electromagnetic analysis. The robust optimization method couples with simulation software flexibility to provide an effective design tool for arbitrary structures. The genetic algorithm is employed strictly for design and not complete structural optimization. Dual band, five and six element switched parasitic antennas are presented. Lumped elemental loading along the radiators provide resonance and directed radiation at two GSM frequencies. Load value, radiator dimension and spacing are incorporated as design parameters. Experimentally built, 10dB return loss bandwidths of 17.2% and 9.6% and front to back ratios of 12.6dB and 8.4dB at 900MHz and 1900MHz respectively are measured. To reduce the ground requirements of monopole arrays, a skirted ground structure for switched parasitic antennas is analyzed. A six element switched parasitic monopole array with conductive ground skirt exhibits a front to back ratio of 10.7dB and main lobe gain of 6.4dBi at 1.575GHz. Radiation is not elevated despite lateral ground terminating at the parasitic elements. Skirt height is observed to linearly control radiation elevation, depressing the principal lobe through 40 degrees from 23 degrees above the horizontal. The Electronically Steerable Passive Array Radiator or ESPAR antenna is an adaptive parasitic monopole array. An ESPAR radiating structure incorporating a conductive ground skirt is designed for operation at 2.4GHz. Utility is confirmed with a frequency sensitivity analysis showing consistent electrical characteristics over an 8.1% bandwidth. The antenna design is improved with optimization to reduce average principal lobe elevation from 25 degrees to 9.7 degrees.
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Schlub, Robert Walter. "Practical Realization of Switched and Adaptive Parasitic Monopole Radiating Structures". Thesis, Griffith University, 2004. http://hdl.handle.net/10072/366803.

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Switched and adaptive parasitic monopole array radiating structures are investigated. Antenna design is orientated toward increasing practicability for implementation in terrestrial wireless communication systems. A number of antennas are designed with the aid of optimization and commercial simulation software. Simulation procedure was verified with the experimental manufacture and measurement of the arrays. The antennas presented in this thesis comprise an active monopole surrounded by a ring of parasitic monopoles. Parasitic radiators are constructed with static loading to enable simple experimental realization. Beam positions of an electrically steered equivalent antenna are thus simulated. Antenna symmetry ensures the beam can be reproduced throughout the azimuth. Complex antenna geometries require antenna design through optimization. A genetic algorithm is employed with HFSS and NEC for electromagnetic analysis. The robust optimization method couples with simulation software flexibility to provide an effective design tool for arbitrary structures. The genetic algorithm is employed strictly for design and not complete structural optimization. Dual band, five and six element switched parasitic antennas are presented. Lumped elemental loading along the radiators provide resonance and directed radiation at two GSM frequencies. Load value, radiator dimension and spacing are incorporated as design parameters. Experimentally built, 10dB return loss bandwidths of 17.2% and 9.6% and front to back ratios of 12.6dB and 8.4dB at 900MHz and 1900MHz respectively are measured. To reduce the ground requirements of monopole arrays, a skirted ground structure for switched parasitic antennas is analyzed. A six element switched parasitic monopole array with conductive ground skirt exhibits a front to back ratio of 10.7dB and main lobe gain of 6.4dBi at 1.575GHz. Radiation is not elevated despite lateral ground terminating at the parasitic elements. Skirt height is observed to linearly control radiation elevation, depressing the principal lobe through 40 degrees from 23 degrees above the horizontal. The Electronically Steerable Passive Array Radiator or ESPAR antenna is an adaptive parasitic monopole array. An ESPAR radiating structure incorporating a conductive ground skirt is designed for operation at 2.4GHz. Utility is confirmed with a frequency sensitivity analysis showing consistent electrical characteristics over an 8.1% bandwidth. The antenna design is improved with optimization to reduce average principal lobe elevation from 25 degrees to 9.7 degrees.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Microelectronic Engineering
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Petrus, Paul. "Blind adaptive antenna arrays for mobile communications". Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07112009-040414/.

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Pham, Tien D. "Adaptive antennas in multipath wireless communications". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq35282.pdf.

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Da, Silveira Marthinus Willem. "Analysis of spatially distributed adaptive antenna array systems in cellular networks". Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-06032005-090336/.

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Mousari, Bafrooei Seyed Pedram. "Reflector feeds for large adaptive reflector antennas". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ57513.pdf.

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Tyler, Neville Roy. "Robust adaptive antennas for mobile wireless networks". Thesis, King's College London (University of London), 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418121.

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Piazza, Daniele Dandekar Kapil. "Reconfigurable antennas for adaptive MIMO communication systems /". Philadelphia, Pa. : Drexel University, 2009. http://hdl.handle.net/1860/3037.

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Książki na temat "Adaptive antennas"

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M, Weiner Melvin, red. Adaptive antennas and receivers. Boca Raton, FL: Taylor & Francis, 2005.

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L, Haupt Randy, i Miller Thomas W, red. Introduction to adaptive arrays. Wyd. 2. Raleigh, NC: SciTech Pub., 2011.

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Tapan, Sarkar, red. Smart antennas. Hoboken, N.J: IEEE Press, 2003.

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Compton, R. T. Adaptive antennas: Concepts and performance. Englewood Cliffs, N.J: Prentice-Hall, 1988.

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Compton, R. T. Adaptive antennas: Concept sand performance. Englewood Cliff, New Jersey: Prentice Hall, 1988.

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1968-, Tsoulos George V., red. Adaptive antennas for wireless communications. New York: IEEE Press, 2001.

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Jian, Li, i Stoica Petre, red. Robust adaptive beamforming / edited by Jian Li and Petre Stoica. Hoboken, NJ: John Wiley, 2006.

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Jian, Li, i Stoica Petre, red. Robust adaptive beamforming / edited by Jian Li and Petre Stoica. Hoboken, NJ: John Wiley, 2006.

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Fenn, A. J. Adaptive antennas and phased arrays for radar and communications. Boston: Artech House, 2008.

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Lee, Frederick W. Adaptive radar. Washington, DC: Naval Research Laboratory, 1991.

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Części książek na temat "Adaptive antennas"

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Ohira, Takashi, i Jun Cheng. "Analog Smart Antennas". W Adaptive Antenna Arrays, 184–204. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05592-2_11.

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Zmuda, Henry. "Optical Beamforming for Phased Array Antennas". W Adaptive Antenna Arrays, 219–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05592-2_13.

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Bloch, Samuel. "Adaptive Antennas for GPS". W High Precision Navigation, 149–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74585-0_9.

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Tsoulos, George. "Adaptive Antennas and MIMO Systems for Mobile Communications". W Adaptive Antenna Arrays, 3–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05592-2_1.

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Okamoto, Garret. "Implementation of Smart Antennas for Wireless LAN Systems". W Adaptive Antenna Arrays, 500–520. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05592-2_28.

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Bonek, Ernst, Michael Tangemann i Alexander Kuchar. "Implementation Issues for Fully Adaptive DOA-Based Smart Antennas". W Adaptive Antenna Arrays, 423–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05592-2_24.

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Britto, Elizabeth Caroline, Sathish Kumar Danasegaran, Susan Christina Xavier, A. Sridevi i Abdul Rahim Sadiq Batcha. "Study of Various Beamformers and Smart Antenna Adaptive Algorithms for Mobile Communication". W Smart Antennas, 111–30. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-76636-8_10.

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Weerackody, Vijitha. "The IEEE 802.11 System with Multiple Receive Antennas". W Adaptive Signal Processing, 323–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-11028-7_11.

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Trinkle, Matthew, i Behnam Jamali. "Adaptive Antenna Arrays in RFID". W Handbook of Smart Antennas for RFID Systems, 283–300. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470872178.ch10.

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Yarlagadda, Ramakrishna, V. Ratna Kumari i Venkata Subbaiah Potluri. "A Novel Adaptive Beamforming Algorithm for Smart Antennas". W Advances in Intelligent Systems and Computing, 589–97. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-3393-4_60.

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Streszczenia konferencji na temat "Adaptive antennas"

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Sulic, E., B. Pell, S. John, Rahul K. Gupta, W. Rowe, K. Ghorbani i K. Zhang. "Performance of Embedded Multi-Frequency Communication Devices in Smart Composite Structures". W ASME 2008 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2008. http://dx.doi.org/10.1115/smasis2008-402.

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Lately, there has been an increased demand for vehicle manufacturers to incorporate a large number of communication, security, guidance and entertainment devices in their new vehicle models. In recent decades, the list has expanded from the AM and FM radio antennas to include GPS, mobile phone, collision avoidance radar, Digital Radio and Digital TV antennas. In addition, new technologies such as vehicle to vehicle and vehicle to road side communication are being implemented at 5.9 GHz in the next generation of vehicles. In the past the AM/FM antenna was typically a mast antenna protruding from the vehicle’s exterior, recently however, the trend has been to limit the visibility of vehicular antennas as much as possible to improve vehicle design and aerodynamics. This has lead to integration of antennae so that they become a seamless part of the vehicle structure. This paper reports on a parametric study of embedding an antenna in a polymeric composite substrate in relation to several material processing and coating parameters.
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Daliri, Ali, Sabu John, Chun H. Wang, Amir Galehdar, Wayne S. T. Rowe, Kamran Ghorbani i Paul J. Callus. "Effect of Filler Materials on the Performance of Conformal Load-Bearing Spiral Antennas". W ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-7955.

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The slots in spiral antennas induce stress concentrations and hence may adversely affect the load-carrying capacity of the structural antenna. To minimise the detrimental effect of the slots, appropriate fillers are required to provide structural reinforcement without compromising the radar performance of the antenna. This paper presents an investigation of the effects of electrical and mechanical properties of potential filler materials on the performance of slot spiral antennas. Finite element analysis is carried out for a slot spiral that is designed to work in the C-Band range of frequencies (4–8 GHz). Computational simulations performed using commercial software packages ANSYS® and HFSS® show that by using commercially available filler materials the stress concentration factor of the spiral slot can be reduced by 20%. The results from this research enhance the previously introduced advantages of this type of conformal load-bearing antenna structure (CLAS). This CLAS concept provides a promising solution of replacing conventional externally mounted antennas, thus reducing aircraft weight and aerodynamic drag.
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Daliri, Ali, Chun H. Wang, Sabu John, Amir Galehdar, Wayne S. T. Rowe, Kamran Ghorbani i Paul J. Callus. "FEA Evaluation of the Mechanical and Electromagnetic Performance of Slot Log-Spiral Antennas in Conformal Load-Bearing Antenna Structure (CLAS)". W ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5137.

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Conformal load-bearing antenna structures (CLAS) have been attracting the attention of aerospace industries in recent years. This type of multifunctional structures combines the features of conventional antennas with load-bearing capacity and has important applications in military and commercial airplanes especially for Unmanned Aerial Vehicles (UAVs). Equiangular slot spiral antennas are an alternative to traditional rectangular slots because of its wideband radiation characteristics. However, the mechanical characteristics of such a spiral antenna integrated into a structure are so far largely unexplored. In this paper, the electromagnetic (scattering parameter, radiation pattern and gain) and mechanical properties (stress concentration factor (SCF)) of spiral antennas is investigated using finite element analysis (FEA). The results lead to a recommendation for using this type of antenna for future CLAS concepts.
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Daliri, Ali, Sabu John, Amir Galehdar, Wayne S. T. Rowe i Kamran Ghorbani. "Strain Measurement in Composite Materials Using Microstrip Patch Antennas". W ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3703.

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In this paper the feasibility of using a circular microstrip patch antenna to detect strain in composite plates and the effects of different materials on sensitivity of the patch antenna are investigated. Also the effect of strain direction on the frequency shift is studied. The theoretical model shows a linear relationship between strain and the shift in the resonant frequency of the antenna in any material. A circular microstrip patch antenna is designed and fabricated to work at 1.5GHz and attached to three different materials for testing. Both Finite Element Analysis (FEA) and experimental tests have been undertaken to corroborate the relationship between strain and frequency shift. The ultimate intention of this work is to configure antennas for the detection of relatively small damage zones in structures and to do so wirelessly.
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Yi, Xiaohua, Chunhee Cho, Yang Wang, Benjamin S. Cook, James Cooper, Rushi Vyas, Manos M. Tentzeris i Roberto T. Leon. "Passive Frequency Doubling Antenna Sensor for Wireless Strain Sensing". W ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-7923.

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This paper presents the design, simulation, and preliminary measurement of a passive (battery-free) frequency doubling antenna sensor for strain sensing. Illuminated by a wireless reader, the sensor consists of three components, i.e. a receiving antenna with resonance frequency f0, a transmitting antenna with resonance frequency 2f0, and a matching network between the receiving and transmitting antennas. A Schottky diode is integrated in the matching network. Exploiting nonlinear circuit behavior of the diode, the matching network is able to generate output signal at doubled frequency of the reader interrogation signal. The output signal is then backscattered to the reader through the sensor-side transmitting antenna. Because the backscattered signal has a doubled frequency, it is easily distinguished by the reader from environmental reflections of original interrogation signal. When one of the sensor-side antennas, say receiving antenna, is bonded to a structure that experiences strain/deformation, resonance frequency of the antenna shifts accordingly. Through wireless interrogation, this resonance frequency shift can be measured by the reader and used to derive strain in the structure. Since operation power of the diode is harvested from the reader interrogation signal, no other power source is needed by the sensor. This means the frequency doubling antenna sensor is wireless and passive. Based on simulation results, strain sensitivity of this novel frequency doubling antenna sensor is around −3.84 kHz/με.
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Weverka, Robert T., Anthony W. Sarto i Kelvin Wagner. "Photorefractive Phased-Array-Radar Processor Dynamics". W Optical Computing. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/optcomp.1993.owd.2.

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Large adaptive, two dimensional phased-array radar antennas can consist of thousands of antenna elements, have GHz bandwidths, and must be able to steer and adapt the antenna beam rapidly in a dynamic signal environment.
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Daliri, Ali, Chun H. Wang, Sabu John, Amir Galehdar, Wayne S. T. Rowe i Kamran Ghorbani. "Multidirectional Circular Microstrip Patch Antenna Strain Sensor". W ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5065.

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In this paper, a new design for microstrip patch antenna strain sensors is proposed. The new antenna sensor works based on the meandered microstrip patch antennas. It is threefold more sensitive than previously proposed circular microstrip patch antenna strain sensors. Also, the overall physical dimension of the new antenna sensor is reduced by the factor of five. The current sensor is able to detect strain in all directions. In order to design the antenna sensor, two available commercial FEM software packages ANSYS™ and HFSS™ are used. Both experimental and FEM results corroborate the multidirectional feature of the new antenna sensor. Also, the effect of the hole size in the structure (for coaxial connection to the antenna) on the antenna performance has been studied. Based on the results obtained, the antenna sensor can be recommended for use in structural health monitoring for strain-based damage detection in aerospace structures.
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"Antenna arrays, adaptive and smart antennas". W 2015 International Conference on Antenna Theory and Techniques (ICATT). IEEE, 2015. http://dx.doi.org/10.1109/icatt.2015.7136813.

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Shafai, Lotfollah, Satish K. Sharma i Cyrus Shafai. "Antenna Miniaturization and Adaptive Aperture Antennas". W 2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting. IEEE, 2020. http://dx.doi.org/10.1109/ieeeconf35879.2020.9330116.

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Daliri, Ali, Sabu John, Chun H. Wang, Amir Galehdar, Wayne S. T. Rowe i Kamran Ghorbani. "Wireless Strain Sensors Using Electromagnetic Resonators". W ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-7954.

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The concept of wireless passive strain sensors has been introduced in the last few years for applications such as structural health monitoring. This study investigates the use of circular microstrip patch antenna (CMPA) sensors for wireless passive measurement of strain. The strain induced in an aluminium plate was measured wirelessly up to 5 cm away from the sensor using a CMPA made from commercial FR4 substrate, and at a distance up to 20 cm using a CMPA made from Rogers® RT/duroid 6010™. These results show the substrate of antennas is one of the factors affecting the interrogation distance. The interrogation distance between the sensor and the patch antenna was improved significantly using the Rogers® substrate.
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Raporty organizacyjne na temat "Adaptive antennas"

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Ziolkowski, Richard W. Metamaterial-Based Patch Antennas and Adaptive Rectifying Circuits for High Power Rectenna Applications. Fort Belvoir, VA: Defense Technical Information Center, styczeń 2005. http://dx.doi.org/10.21236/ada435786.

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Magill, D. T. Adaptive Beam Antenna Communication Networks. Fort Belvoir, VA: Defense Technical Information Center, maj 1988. http://dx.doi.org/10.21236/ada200953.

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Buche, Robert T., i Harold J. Kushner. Adaptively Optimizing the Algorithms for Adaptive Antenna Arrays for Randomly Time-Varying Mobile Communications Systems. Fort Belvoir, VA: Defense Technical Information Center, styczeń 2002. http://dx.doi.org/10.21236/ada461804.

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Himed, Braham. Effects of Antenna Mutual Coupling in Space-Time Adaptive Processing (STAP). Fort Belvoir, VA: Defense Technical Information Center, wrzesień 1998. http://dx.doi.org/10.21236/ada358691.

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Buche, Robert, i Harold J. Kushner. Adaptive Optimization of Least Squares Tracking Algorithms: With Applications to Adaptive Antenna Arrays for Randomly Time-Varying Mobile Communications Systems. Fort Belvoir, VA: Defense Technical Information Center, luty 2003. http://dx.doi.org/10.21236/ada461785.

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Capraro, Gerard T., Christopher T. Capraro i Donald D. Weiner. Increasing Secondary Data or Enhanced Adaptive Displaced Phase Centered Antenna Approaches. Volume II. Fort Belvoir, VA: Defense Technical Information Center, marzec 2001. http://dx.doi.org/10.21236/ada387495.

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Blum, Rick S. Increasing Secondary Data or Enhanced Adaptive Displaced Phase Centered Antenna Approaches. Volume I. Fort Belvoir, VA: Defense Technical Information Center, marzec 2001. http://dx.doi.org/10.21236/ada387578.

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Williams, Jonathan H., Robert J. Davis i Eddie N. Rosario. Multipath Mitigation Performance of Planar GPS Adaptive Antenna Arrays for Precision Landing Ground Stations. Fort Belvoir, VA: Defense Technical Information Center, styczeń 2000. http://dx.doi.org/10.21236/ada459739.

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Ertin, Emre, Lee C. Potter i Joel T. Johnson. Multi-Mode, Multi-Antenna Software Defined Radar for Adaptive Tracking and Identification of Targets in Urban Environments. Fort Belvoir, VA: Defense Technical Information Center, październik 2011. http://dx.doi.org/10.21236/ada567616.

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