Relevant bibliographies by topics / Near-Field Radiation Pattern

Academic literature on the topic 'Near-Field Radiation Pattern'

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Published: 14 March 2023

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Journal articles on the topic "Near-Field Radiation Pattern"

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Shankpal, Preetham, Varun Arur, Govind Kadambi, and James Shuttleworth. "A Generalized Approach for Computation of Near Field Radiation Pattern of an Antenna." International Journal of Antennas and Propagation 2014 (2014): 1–18. http://dx.doi.org/10.1155/2014/958148.

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A generalized procedure in the form of an analytical formulation for the determination of radiation pattern of an antenna at any arbitrary distance which covers the near field as well as far field is presented in this paper. With the prior knowledge of either the current or field distribution on the radiating aperture, the proposed near field analysis is generic and can be applied for wide variety of antenna elements. The underlying principle of the generalized procedure is tantamount to considering the radiating aperture as an array of point electric and magnetic dipoles. The validity and novelty of the proposed new approach have been substantiated considering an open ended circular cylindrical waveguide and a conical horn as case studies and treating the far field as a special case of near field with pertinent distance criterion. The effect of change in the distance of observation ranging from reactive near field to far field on the radiation patterns of these antennas has also been discussed. The simulation studies reveal that the depicted normalized phase patterns of both the circular waveguide and conical horn follow the changes in the profile of the corresponding amplitude patterns.
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Aho-Mantila, L., F. Subba, M. Bernert, D. P. Coster, S. Wiesen, M. Wischmeier, X. Bonnin, et al. "Predictions of radiation pattern and in–out asymmetries in the DEMO scrape-off layer using fluid neutrals." Nuclear Fusion 62, no. 5 (March 2, 2022): 056015. http://dx.doi.org/10.1088/1741-4326/ac4d62.

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Abstract Strongly radiating and detached high-power discharges in present-day full-metal tokamaks have a characteristic radiation pattern involving condensation of radiation near the X-point, with significant radiative losses above the X-point. In contrast, Demonstration Fusion Power Plant (DEMO) divertor exhaust scoping studies using reduced physics models, including a fluid description for the neutrals, place the strongest radiation fronts in the divertor legs, near the separatrix. The present contribution studies sensitivity of the radiation pattern corresponding to maximal divertor impurity radiation to those physics models that are typically neglected in the simulations due to their computational expense: cross-field drifts, complex impurity models and kinetic neutrals. Model benchmarking is carried out in comparison to L-mode discharges, which are shown to feature both divertor and X-point radiation. The simulated plasma conditions with maximal divertor radiation have in–out asymmetries in the divertor legs and at the divertor entrance, and the asymmetries and the radiation patterns are observed to be sensitive to both cross-field drift effects and the neutral model. DEMO simulations, carried out using SOLPS-ITER, show an impact of cross-field drifts on the divertor asymmetries, but the impact is not large enough to move the radiation front from the divertor legs to regions above the X-point.
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Isernia, T., G. Leone, and R. Pierri. "Radiation pattern evaluation from near-field intensities on planes." IEEE Transactions on Antennas and Propagation 44, no. 5 (May 1996): 701. http://dx.doi.org/10.1109/8.496257.

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Peña-Ruiz, S., J. Sosa-Pedroza, F. Martinez-Zuñiga, A. Rodríguez-Sánchez, E. Garduño-Nolasco, and And M. Enciso-Aguilar. "Near field analysis and field transformation applied to a parabolic profile at 5GHz." Revista Mexicana de Física 65, no. 3 (May 7, 2019): 268. http://dx.doi.org/10.31349/revmexfis.65.268.

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We proposed a method of analysis and field transformation is applied to a 1.5 m diameter parabolic reflector at a frequency of 5 GHz, an antenna of these dimensions requires at least a 75 m region to obtain its radiation pattern, and this represents a problem, here arises the necessity to make field transformations like the one presented in this work. Near field is modeled by means of Finite Difference Time Domain Method (FDTD) and current distribution is obtained using the discrete Pocklington equation. Radiation pattern is calculated applying the array factor for parabolic profiles. Results are compared with those obtained by CST Microwave Studio with a very good agreement.
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Calazans, T., H. D. Griffiths, A. L. Cullen, D. E. N. Davies, and R. Benjamin. "Antenna radiation pattern measurement using a near-field wire scattering technique." IEE Proceedings - Microwaves, Antennas and Propagation 145, no. 3 (1998): 263. http://dx.doi.org/10.1049/ip-map:19981775.

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Stangl, N. "MF AM antenna radiation pattern verification method by near field measurements." IEEE Transactions on Broadcasting 47, no. 3 (2001): 285–91. http://dx.doi.org/10.1109/11.969377.

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Herschmann, R., and O. Büchel. "Radiation characteristics of a coaxial waveguide with eccentric inner conductor for application in hyperthermia and microwave reflex therapy." Advances in Radio Science 5 (June 13, 2007): 189–95. http://dx.doi.org/10.5194/ars-5-189-2007.

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Abstract. This paper examines the radiation characteristics of a contact emitter conceived for application in hyperthermia and microwave reflex therapy. It is important to analyse the distribution of power density in the near field area, as the radiator's therapeutic sphere of activity is localized here. The contact emitter is a coaxial radiator with an eccentric course of the inner conductor. According to Huygens principle, a theoretical view of the near field radiation characteristics is made by determining the equivalent current densities in the emitter aperture. It is shown that by an eccentric shift of the inner conductor, an almost isotropic near field radiation pattern and power density can be achieved. For this, the electromagnetic field in the emitter aperture is determined by using a Bipolar coordinate system. This calculation considers only the fundamental TEM mode of the contact emitter. Besides the theoretical results near and far fields are simulated using the programme system Ansoft HFSS.
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Shum, S. M., and K. M. Luk. "An efficient FDTD near-to-far-field transformation for radiation pattern calculation." Microwave and Optical Technology Letters 20, no. 2 (January 20, 1999): 129–31. http://dx.doi.org/10.1002/(sici)1098-2760(19990120)20:2<129::aid-mop14>3.0.co;2-c.

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Huang, Quan, Yuxin Wu, Yan Gao, Wenxiao Fang, Zhiqiang Yi, Yun Huang, Guoguang Lu, and Kaiwei Wang. "An EMI radiation grouping approach based on spectral cluster in near filed scanning for assessment." IOP Conference Series: Materials Science and Engineering 1207, no. 1 (November 1, 2021): 012018. http://dx.doi.org/10.1088/1757-899x/1207/1/012018.

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Abstract With the ever-increasing operating frequency in integrated circuit, it is very essentialto assess the radiation used to help the IC designer. Based on the similarity of electromagnetic patterns obtained from the radiation of ICs and their nonlinear edge, we develop a post-processing technique to group the electromagnetic patterns. A near field scanning is performed to obtain and extract the electromagnetic pattern that is used to validate the technique. Experiment results show that it can accurately group the electromagnetic patterns by which radiation assessment can be performed.
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Maisto, Maria Antonia, Giovanni Leone, Adriana Brancaccio, and Raffaele Solimene. "Efficient Planar Near-Field Measurements for Radiation Pattern Evaluation by a Warping Strategy." IEEE Access 9 (2021): 62255–65. http://dx.doi.org/10.1109/access.2021.3074786.

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Dissertations / Theses on the topic "Near-Field Radiation Pattern"

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Scott, H. M. "Near field modification techniques for pattern shaping in antenna elements and arrays." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269176.

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Herzog, Scott M. "Radiation pattern calculation for missile radomes in the near field of an antenna." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA320828.

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Thesis (M.S. in Aeronautical Engineering (Avionics)) Naval Postgraduate School, September 1996.
Thesis advisor(s): David C. Jenn, Robert E. Ball. "September 1996." Includes bibliographical references (p. 69). Also available online.
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GIORDANENGO, GIORGIO. "Hybrid Measurement/Simulation Approaches for Antenna Testing." Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2643123.

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This work investigate the performance of a set of techniques to reduce the number of measurement points and then the associated measurement time, by introducing a set of algorithms able to perform fast antenna testing by mixing together measurements and simulations. More specifically, the following points will be investigated: 1) introduction of a new hybrid system that joins suitable simulations of the Device Under Test (DUT) and measured data; 2) definition of suitable metrics to evaluate the performance of the reconstructions; 3) introduction of a probe compensation technique able to take into account of the effects that a probe can introduce (due to the close distance between DUT and probe itself); 4) introduction of Reduced Order Model (ROM) techniques applied to the specific problem of antenna placing.
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Diakite, Cheick. "Identification d’un modèle de mesure au sol du diagramme de rayonnement des antennes installées sur aéronefs." Thesis, Université Côte d'Azur (ComUE), 2018. http://www.theses.fr/2018AZUR4007.

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La détermination du diagramme de rayonnement d’une antenne installée sur un porteur est indispensable pour la validation des systèmes RF auxquels sont associées ces antennes. Lorsque l’antenne est placée sur le porteur, la structure rayonnante est formée par l’antenne et le porteur. Le diagramme doit être déterminé à grande distance de la source dans la zone de champ lointain. Suivant la fréquence de travail et la taille de la source rayonnante, cette distance peut être grande. Elle est par exemple de l’ordre 85m lorsque l’on cherche à caractériser à 88MHz une source rayonnante de dimension maximale 12m. Actuellement, cette distance de champ lointain, est obtenue lors des essais en vol au cours desquels l’aéronef est à 80km de la station sol relevant le diagramme. Cette méthode de caractérisation n’est pas tenable à long terme, en raison de son coût et des temps de mesure. C’est pourquoi Airbus Helicopter veut mettre en œuvre une mesure au sol mais ce dernier perturbe grandement le rayonnement. La méthode de caractérisation retenue permet d’effectuer les mesures au sol dans un espace réduit et permet de s’affranchir de l’influence du sol. La méthode retenue repose sur la caractérisation en champ proche dans une géométrie cylindrique, associée à une technique de correction de diagramme de rayonnement basée sur la décomposition de modes. La mesure champ proche requiert l’acquisition des données de champ proche sur une surface cylindrique, puis un algorithme de transformation développé en environnent MATLAB effectue le passage en champ lointain. Le champ lointain est décomposé en modes cylindriques, puis un filtrage modal est appliqué pour s’affranchir de l’influence du sol
Aircraft antennas radiation pattern must be measured before radiofrequency systems deployment. When an antenna is on the aircraft, radiating structure is not only antenna element but it’s the set antenna and aircraft. Radiation pattern have to be determined at great distance from the radiating structure. This distance is located in area called far field area depending on the frequency of operation and the maximal size of the aircraft. For example, to measure an antenna on an aircraft of 12 m of long at 88 MHz; the far field area is at 85m.To get this distance, flight measurement is performed. During flight test, radiation pattern is determined by a ground station which is at 80 km of the aircraft. This method is very expensive and takes much time and causes serious delays on aircraft delivery. For these reasons Airbus Helicopters explores new innovative solution, like as radiation pattern measurement on the ground. The last one disturbs the radiation pattern. The proposed method allows to perform measurement in compact volume and cancel out the ground influence. Proposed solution is based on cylindrical near field measurement, and cylindrical modes decomposition. Near field data are scanned on cylinder surface, then an algorithm developed on MATLAB environment do near field to far field transformation. Cylindrical modes decomposition and modal filtering rid of ground reflections. Proposed solution has been validated numerically through comparison with electromagnetic simulator software results. Antenna measurement range in the laboratory has served to validate experimentally the proposed solution on a prototype in scale size
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Kojima, Seishiro. "Novel Beamforming and Antenna Techniques for Microwave Power Transmission in Radiating Near Field." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263667.

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Chen, Yao-Jen, and 陳躍仁. "Near-field radiation pattern characterization of ultra-wideband chaotic waveform." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/85649229267483215200.

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碩士
國立陽明大學
生醫光電工程研究所
93
According to statistical data, arising rate of breast cancer has grown three times than past twenty years, and is still increasing. Early detection and timely medical therapy are the key factors to improve survival rate. In this thesis, I successfully construct an optical-injection semiconductor laser system, several dynamical states can be obtained when three experimental accessible parameters are adjusted. Chaotic state is the dynamic state mainly concerned in the experiment. The characterization of the chaotic oscillation state is ultra-wideband (7GHz) and, therefore, it provides better spatial resolution. Then optical signal is transduced to electrical signal utilizing high-speed photodetector, the near-field antenna pattern is characterized through the microwave system and power spectrum. We hope that this technique can be used to image breast cancer in the future. Thanks to auto-correlation analysis of time-series of chaotic oscillation, the far-field axial resolution is 1cm. We analyze the power spectrum and use the 3dB attenuation rate to be the resolution. When Z=1mm, the near-field axial resolution is 0.5mm, when Z=5mm, the axial resolution is 1mm. When Z=1mm and Z=5mm, the near-field lateral resolution is 2mm, when Z=10mm, the lateral resolution is 5~6mm.
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Li, Wen-Hsien, and 李文賢. "Near-field radiation pattern characterization of sub-nanosecond chaotic pulses." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/28604675949763724062.

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碩士
國立陽明大學
生醫光電工程研究所
93
Field pattern of a series of chaotic pulses emitted through a near-field antenna is studied in this thesis to investigate the possibility of 3-D microwave imaging. The chaotic pulses are generated from a semiconductor laser subject to positive optoelectronic feedback. It is observed that the optoelectronic feedback mechanism can generate sub-nanosecond microwave pulses when the optical signal is converted into microwave signal through a high-speed photodiode. The width of the pulses is measured as short as 0.3∼0.5 nanoseconds. It is revealed that the non-periodic pulses can provide 1.8 cm axial resolution when correlation scheme at far-field range is used. While axial resolution can be obtained through the correlation measurement, lateral resolution cannot. A concept of a near-field imaging is therefore investigated in this thesis. This thesis focuses on characterizing the near-field pattern of an antenna with 0.65 mm aperture. The result has shown that different frequency components varied with distance differently. This characteristic provides lateral resolution varied from 1 mm to 8 mm, which depend on the distance from the antenna tip, and the axial resolution ranging from 2 mm to 8 mm. This preliminary study has shown the possibility of utilizing a near-field antenna to obtain 3-dimensional resolution. Since it was reported that cancer tumors in breast have high refractive index compared to normal surrounding tissues in the microwave range, this research will later be used to investigate the feasibility of microwave imaging for the detection of early-stage beast cancer.
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FUSCALDO, WALTER. "Advanced radiating systems based on leaky wave and nondiffracting waves." Doctoral thesis, 2017. http://hdl.handle.net/11573/943920.

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In recent years, microwave, millimeter-wave, and THz applications such as medical and security imaging, wireless power transfer, and near-field focusing, just to mention but a few, have gained much attention in the area of ICT due to their potentially high social impact. On one hand, the need of highly-directive THz sensors with tunable radiating features in the far-field region has recently boosted the research activity in the design of flexible, low-cost and low-profile devices. On the other hand, it is of paramount importance to focus energy in the near-field region, and thus the generation of limited-diffraction waves in the microwave and millimeter-wave regime is a topic of recent increasing interest. In this context, leaky-wave theory is an elegant and extremely useful formalism which allows for describing in a common fashion guiding and radiating phenomena in both the near field and the far field, spanning frequencies from microwaves to optics passing through THz. In this PhD thesis we aim to exploit the intrinsic versatility of the leakywave approach to design advanced radiating systems for controlling the far-field radiating features at THz frequencies and for focusing electromagnetic radiation in the near field at millimeter waves. Specifically, the use of relatively new materials such as graphene and liquid crystals has been considered for the design of leaky-wave based radiators, achieving very promising results in terms of reconfigurability, efficiency, and radiating capabilities. In this context, an original theoretical analysis has provided new general formulas for the evaluation of the radiating features (e.g., half-power beamwidth, sidelobe level, etc.) of leaky-wave antennas. Indeed, the current formulations are based on several simplifying hypotheses which do not allow for an accurate evaluation of the beamwidth in different situations. In addition to the intriguing reconfigurable capabilities offered by leaky waves in far-field applications, interesting focusing capabilities can be obtained in the near field. In particular, it is shown that leaky waves can profitably be used to generate limited-diffraction Bessel beams by means of narrow-band radiators in the microwave range. Also, the use of higher-order leaky-wave modes allows for achieving almost the same performance in the millimeter-wave range, where previous designs were subjected to severe fabrication issues. Even more interestingly, the limited-diffractive character of Bessel beams can also be used to generate limited-diffraction pulses as superpositions of monochromatic Bessel beams over a considerable fractional bandwidth. In this context, a novel theoretical framework has been developed to understand the practical limitations to efficiently generate limited-diffraction, limited-dispersion pulses, such as X-waves, in the microwave/millimeter-wave range. As a result of this investigation, a class of wideband radiators has been thoroughly analyzed, showing promising capabilities for the generation of both zeroth-order and higher-order Xwaves. The latter may pave the way for the first localized transmission of orbital angular momentum in the microwave range.
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Books on the topic "Near-Field Radiation Pattern"

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Radiation Pattern Calculation for Missile Radomes in the Near Field of an Antenna. Storming Media, 1996.

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Book chapters on the topic "Near-Field Radiation Pattern"

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Weik, Martin H. "near-field radiation pattern." In Computer Science and Communications Dictionary, 1075. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_12125.

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Conference papers on the topic "Near-Field Radiation Pattern"

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Chou, Min, Kai-Wen Liang, Meng-Hua Tu, and Sung-Mao Wu. "Transmission line signal radiation pattern by near-field measurement." In 2017 International Conference on Electronics Packaging (ICEP). IEEE, 2017. http://dx.doi.org/10.23919/icep.2017.7939366.

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Basikolo, Thomas, Hirovuki Arai, Satoshi Hori, and Shinya Iwanaga. "Reconstruction of Far Field Radiation Pattern from Hemispherical Near Field Measurements." In 2018 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM). IEEE, 2018. http://dx.doi.org/10.1109/iwem.2018.8536677.

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Speciale, Ross A. "Computer-simulation of near-field phased-array radiation-pattern scanning." In 2007 IEEE Antennas and Propagation Society International Symposium. IEEE, 2007. http://dx.doi.org/10.1109/aps.2007.4395822.

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Williamson, Thomas G., Paul Simmons, Jacob Houck, Daniel Leatherwood, Jason Whelan, Walter Disharoon, and Drew Kerr. "Mathematical Techniques for Near Field Radiation Pattern Characterization of Digital Arrays." In 2022 IEEE Aerospace Conference (AERO). IEEE, 2022. http://dx.doi.org/10.1109/aero53065.2022.9843281.

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Sukpreecha, Kitiphon, Kittisak Phaebua, Titipong Lertwiriyaprapa, Kittima Lertsakwimarn, and Danai Torrungrueng. "Radiation Pattern Measurements of Small Antennas Using Spherical Near-field Measurement Technique." In 2022 Research, Invention, and Innovation Congress: Innovative Electricals and Electronics (RI2C). IEEE, 2022. http://dx.doi.org/10.1109/ri2c56397.2022.9910277.

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Hirayama, H., and Y. Kami. "Estimation of near-E field and far-field radiation pattern with only near-H field measurement by using the Yee scheme." In 2003 IEEE International Symposium on Electromagnetic Compatibility, 2003. EMC '03. IEEE, 2003. http://dx.doi.org/10.1109/icsmc2.2003.1428199.

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Yang, M. R., T. Y. Liu, and B. Zhao. "A method for improving near-field BP imaging that Uses radiation pattern compensation." In 2022 3rd China International SAR Symposium (CISS). IEEE, 2022. http://dx.doi.org/10.1109/ciss57580.2022.9971293.

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Shu, Yufei, Xingchang Wei, and Yanbin Yang. "Patch Antenna Radiation Pattern Evaluation Based on Phaseless and Single-Plane Near-Field Scanning." In 2019 IEEE International Conference on Computational Electromagnetics (ICCEM). IEEE, 2019. http://dx.doi.org/10.1109/compem.2019.8778952.

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Pivnenko, S., J. M. Nielsen, and O. Breinbjerg. "Very high-accuracy calibration of radiation pattern and gain of a near-field probe." In 2014 8th European Conference on Antennas and Propagation (EuCAP). IEEE, 2014. http://dx.doi.org/10.1109/eucap.2014.6902114.

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Xu, Rui, Hanjie Chen, and Zhengyuan Xu. "The Near-field Radiation Pattern of an OLED Panel and Its Application in Detection." In 2018 11th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP). IEEE, 2018. http://dx.doi.org/10.1109/csndsp.2018.8471896.

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