<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">radioelectronics</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений России. Радиоэлектроника</journal-title><trans-title-group xml:lang="en"><trans-title>Journal of the Russian Universities. Radioelectronics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1993-8985</issn><issn pub-type="epub">2658-4794</issn><publisher><publisher-name>Saint Petersburg Electrotechnical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32603/1993-8985-2019-22-5-42-51</article-id><article-id custom-type="elpub" pub-id-type="custom">radioelectronics-374</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ЭЛЕКТРОДИНАМИКА, МИКРОВОЛНОВАЯ ТЕХНИКА, АНТЕННЫ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ELECTRODYNAMICS, MICROWAVE ENGINEERING, ANTENNAS</subject></subj-group></article-categories><title-group><article-title>Моделирование и практическая реализация широкополосной двухгребневой рупорной антенны с шириной рабочей полосы более октавы и высоким уровнем кроссполяризационной развязки</article-title><trans-title-group xml:lang="en"><trans-title>Modeling and Practical Implementation of a Broadband Double-Ridged Horn Antenna with an Operating Range More Than an Octave and a High Level of Cross-Polarization Discrimination</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4953-3671</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мещеряков</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Meshcheriakov</surname><given-names>Viktor V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Мещеряков Виктор Владимирович – магистр по направлению "Электроника и наноэлектроника" (2013), старший инженер ООО "Апстек Лабс". Автор 18 научных работ. Сфера интересов – ВЧ-моделирование; алгоритмы радиовидения; прикладная физика; программирование ПЛИС и МК.</p><p>наб. Обводного канала, д. 199-201, корп. И, Санкт-Петербург, 190020, Россия</p></bio><bio xml:lang="en"><p>Viktor V. Meshcheriakov – Master Sci. (2013) on Electronics and Nanoelectronics, Senior Engineer in Apstec Labs LTD. The author of 18 scientific publications. Area of expertise: high frequency modeling; radio vision algorithms; applied physics; FPGA programming.</p><p>199–201 Nab. Obvodnogo kanala, Saint Petersburg 190020, Russia</p></bio><email xlink:type="simple">mescheryakov.v.v@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Маркова</surname><given-names>Н. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Markova</surname><given-names>Natalia V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Маркова Наталья Владимировна – инженер по специальности "Радиофизика" (1975, Томский государственный университет), инженер ООО "Апстек Лабс". Сфера интересов – практическая электродинамика для антенных систем.</p><p>наб. Обводного канала, д. 199-201, корп. И, Санкт-Петербург, 190020, Россия</p></bio><bio xml:lang="en"><p>Natalia V. Markova – Graduate Engineer on Radiophysics (1975, Tomsk State University), Engineer in Apstec Labs LTD. Area of expertise: practical electrodynamics for antenna systems.</p><p>199–201 Nab. Obvodnogo kanala, Saint Petersburg 190020, Russia</p></bio><email xlink:type="simple">nmarkova@apsteclabs.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Юрманов</surname><given-names>П. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Iurmanov</surname><given-names>Pavel D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Юрманов Павел Дмитриевич – магистр по направлению "Техническая физика" (2005), начальник производственного отдела ООО "Апстек Лабс". Автор трех научных публикаций. Сфера интересов – НЧ- и ВЧсхемотехника; моделирование; разработка печатных плат.</p><p>наб. Обводного канала, д. 199-201, корп. И, Санкт-Петербург, 190020, Россия</p></bio><bio xml:lang="en"><p>Pavel D. Iurmanov – Master Sci. (2005) on Technical Physics, Head of Production in Apstec Labs LTD. The author of 3 scientific publications. Area of expertise: LF and HF circuitry; modeling; development of printed circuit boards.</p><p>199–201 Nab. Obvodnogo kanala, Saint Petersburg 190020, Russia</p></bio><email xlink:type="simple">piurmanov@apsteclabs.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">ООО "Апстек Лабс"<country>Россия</country></aff><aff xml:lang="en">Apstec Labs LTD<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>04</day><month>12</month><year>2019</year></pub-date><volume>22</volume><issue>5</issue><fpage>42</fpage><lpage>51</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Мещеряков В.В., Маркова Н.В., Юрманов П.Д., 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Мещеряков В.В., Маркова Н.В., Юрманов П.Д.</copyright-holder><copyright-holder xml:lang="en">Meshcheriakov V.V., Markova N.V., Iurmanov P.D.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://re.eltech.ru/jour/article/view/374">https://re.eltech.ru/jour/article/view/374</self-uri><abstract><sec><title>Введение</title><p>Введение. Для решения задачи радиополяриметрии в многопозиционных микроволновых досмотровых системах (ММДС) с апертурным синтезом необходимо использовать антенны с высоким уровнем кроссполяризационной развязки (КПР) в широком пространственном угле. Восстановление радиоизображений в ММДС происходит на дистанциях, соизмеримых с размерами апертуры антенных структур, поэтому значение пространственного угла, в котором необходимо выполнение требования высокой КПР, может достигать 30°. Таким образом, возникает новая задача создания антенной структуры X- и Ku-диапазонов, применение которой в ММДС позволило бы решить задачу построения радиоизображения деполяризованного микроволнового излучения, рассеянного скрытыми опасными объектами на теле человека.</p></sec><sec><title>Цель работы</title><p>Цель работы. Разработка приемной антенны жесткой конструкции для долговременной эксплуатации в ММДС с уровнем КПР 28 дБ при пространственном угле 30° и рабочих частотах 8… 20 ГГц.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Определены требования для приемной антенны в ММДС. Приведены теоретические обоснования для выбора конструкции антенны. В разработанной ММДС для построения микроволнового изображения используется апертурный синтез. Представлены этапы и результаты моделирования широкополосных двухгребневых антенн в программе трехмерного моделирования электромагнитного поля CST Studio. Рассмотрены результаты моделирования двухгребневых антенн: пирамидальной, конической, в круглом и эллиптическом волноводах. Произведено сравнение результатов измерения в безэховой камере для макета полученной антенны и результатов моделирования.</p></sec><sec><title>Результаты</title><p>Результаты. Разработана и изготовлена двухгребневая эллиптическая антенна жесткой конструкции, с КСВН не более 2 и кроссполяризационной развязкой в пространственном угле 30° не менее 28 дБ в диапазоне частот, перекрывающем октаву.</p></sec><sec><title>Заключение</title><p>Заключение. Антенна может быть использована в ММДС для детектирования эффекта деполяризации микроволнового излучения скрытыми опасными объектами на теле человека. Высокое значение КПР антенны в широком пространственном угле позволит в дальнейшем внедрить микроволновую поляриметрию в ММДС.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. The resolution of the problem of radio polarimetry in multiposition microwave screening systems (MMSS) with aperture synthesis requires the use of antennas with a high level of cross-polarization discrimination (XPD) in a wide spatial angle. The radio images are reconstructed in MMSS at distances commensurate with the aperture of the antenna structures. Therefore, the value of the spatial angle, at which high XPD is required, can reach 30°. This leads to a new problem of creating an antenna configuration of the X and Ku band, the application of which in MMSS will resolve the problem of constructing a radio image of depolarized microwave radiation scattered on the human body in the form of hidden dangerous objects.</p></sec><sec><title>Aim</title><p>Aim. To develop a double-ridged receiving antenna for long-term operation in MMSS with an XPD level of 28 dB at a spatial angle of 30° and operating frequencies of 8…20 GHz.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. The requirements for the receiving antenna in MMSS were determined. Theoretical justifications were proposed for the choice of antenna design. Aperture synthesis was used to construct microwave images in MMSS. The stages and results of modelling broadband double-ridge antennas were presented using the CST Studio software broadly applied for three-dimensional electro-magnetic field modelling. The results of modelling pyramidal and conical double-ridged antennas, as well as those in circular and elliptical waveguides, were analyzed. The designed antenna was tested in an anechoic chamber. The measurement results were compared with those obtained during simulation.</p></sec><sec><title>Results</title><p>Results. An elliptical double-ridged horn antenna with a VSWR of no more than 2 and cross-polarization discrimination in a spatial angle of 30° of no less than 28 dB for the frequency range that covers an octave was designed and constructed.</p></sec><sec><title>Conclusion</title><p>Conclusion. The developed antenna can be used in MMSS for the purpose of detecting the effect of micro-wave radiation depolarization as hidden dangerous objects on a human body. Such characteristics of the antenna as its high XPD value in a wide spatial angle will allow the future introduction of microwave polarimetry in MMSS.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>двухгребневая рупорная антенна</kwd><kwd>кроссполяризационная развязка</kwd><kwd>эллиптическая двухгребневая антенна</kwd></kwd-group><kwd-group xml:lang="en"><kwd>double-ridged horn antenna</kwd><kwd>cross-polarisation discrimination</kwd><kwd>double-ridged elliptical antenna</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Григорьев А. Д., Мещеряков В. В., Семенов С. Н. Исследование эффекта изменения поляризации микроволнового излучения скрытыми объектами на теле человека // Изв. вузов России. Радиоэлектроника. 2015. № 6. С. 41–45.</mixed-citation><mixed-citation xml:lang="en">Grigoriev A. D., Mesheryakov V. V., Semenov S. N. Investigation of polarization changing effect by hidden objects placed on a human body. Journal of the Russian Universities. Radioelectronics. 2015, no. 6, pp. 41–45. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Cameron W. L., Youssef N. N., Leung L. K. Simulated Polarimetric Signatures of Primitive Geometrical Shapes // IEEE Trans. on Geoscience and Remote Sensing. 1996. Vol. 34, № 3. P. 793–803. doi: 10.1109/36.499784</mixed-citation><mixed-citation xml:lang="en">Cameron W. L., Youssef N. N., Leung L. K. Simulated Polarimetric Signatures of Primitive Geometrical Shapes. IEEE Trans. on Geoscience and Remote Sensing. 1996, vol. 34, no. 3, pp. 793–803. doi: 10.1109/36.499784</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Touzi R., Charbonneau F. Characterization of Target Symmetric Scattering Using Polarimetric SARs // IEEE Trans on Geoscience and Remote Sensing. 2002. Vol. 40, № 11. P. 2507–2516. doi: 10.1109/TGRS.2002.805070</mixed-citation><mixed-citation xml:lang="en">Touzi R., Charbonneau F. Characterization of Target Symmetric Scattering Using Polarimetric SARs. IEEE Trans on Geoscience and Remote Sensing. 2002, vol. 40, no. 11, pp. 2507–2516. doi: 10.1109/TGRS.2002.805070</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Design and Implementation of 0.7 to 7 GHz Broadband Double-Ridged Horn Antenna / H. Fallahi, M. Kaboli, S. A. Mirtaheri, A. Mehrdadian // 7 th Intern. Symp. on Telecommunications (IST'2014). Tehran, Iran, 9–11 Sept. 2014, Piscataway: IEEE, 2014. P. 250–255. doi: 10.1109/ISTEL.2014.7000707</mixed-citation><mixed-citation xml:lang="en">Fallahi H., Kabo-li M., Mirtaheri S. A., Mehrdadian A. Design and Implementation of 0.7 to 7 GHz Broadband Double-Ridged Horn Antenna. 7 th Intern. Symp. on Telecommunications (IST'2014). 9–11 Sept. 2014, Tehran, Iran. Piscataway, IEEE, 2014, pp. 250–255. doi: 10.1109/ISTEL.2014.7000707</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Paez C. I., Criollo E. H. Improved Broadband Double Ridged Horn Antenna without Split Radiation Pattern // IEEE Latin America Trans. 2016. Vol. 14, iss. 3. P.1156–1161. doi: 10.1109/TLA.2016.7459593</mixed-citation><mixed-citation xml:lang="en">Paez C. I., Criollo E. H. Improved Broadband Double Ridged Horn Antenna without Split Radiation Pattern. IEEE Latin America Trans. 2016, vol. 14, iss. 3, pp.1156–1161. doi: 10.1109/TLA.2016.7459593</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Migliaccio M., Gambardella A., Tranfaglia M. SAR Polarimetry to Observe Oil Spills // IEEE Trans. on Geoscience and Remote Sensing. 2007. Vol. 45, iss. 2. P. 506–511. doi: 10.1109/TGRS.2006.888097</mixed-citation><mixed-citation xml:lang="en">Migliaccio M., Gambardella A., Tranfaglia M. SAR Polarimetry to Observe Oil Spills. IEEE Trans. on Geoscience and Remote Sensing. 2007, vol. 45, iss. 2, pp. 506–511. doi: 10.1109/TGRS.2006.888097</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Martorella M., Berizzi F., Bruscoli S. Use of Genetic Algorithms for Contrast Maximization and Entropy Minimization in ISAR Autofocusing // EURASIP J. on Applied Signal Processing. Vol. 2006. Article ID 87298. P. 1–11. doi: 10.1155/ASP/2006/87298</mixed-citation><mixed-citation xml:lang="en">Martorella M., Berizzi F., Bruscoli S. Use of Genetic Algorithms for Contrast Maximization and Entropy Minimization in ISAR Autofocusing. EURASIP J. on Applied Signal Processing. Vol. 2006, article ID 87298, pp. 1–11. doi: 10.1155/ASP/2006/87298</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Jacobs O. B., Odendaal J. W., Joubert J. Elliptically Shaped Quad-Ridge Horn Antennas as Feed for a Reflector // IEEE Antennas and Wireless Propagation Lett. 2011. Vol. 10. P. 756–759. doi: 10.1109/LAWP.2011.2163050</mixed-citation><mixed-citation xml:lang="en">Jacobs O. B., Odendaal J. W., Joubert J. Elliptically Shaped Quad-Ridge Horn Antennas as Feed for a Reflector. IEEE Antennas and Wireless Propagation Lett. 2011, vol. 10, pp. 756–759. doi: 10.1109/LAWP.2011.2163050</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Broadband Dual-Polarization Microstrip Antenna with High Cross-Polarization Isolation for SAR / Y. Ma, J. Hu, Y. Zhang, L. Li, L. Liu // 2018 China Intern. SAR Symp. (CISS). Shanghai, China, 10–12 Oct. 2018, Piscataway: IEEE, 2018. doi: 10.1109/SARS.2018.8551999</mixed-citation><mixed-citation xml:lang="en">Ma Y., Hu J., Zhang Y., Li L., Liu L. Broadband DualPolarization Microstrip Antenna with High CrossPolarization Isolation for SAR. 2018 China Intern. SAR Symp. (CISS). Shanghai, China, 10–12 Oct. 2018. Piscataway, IEEE, 2018. doi: 10.1109/SARS.2018.8551999</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Stojce D. I. Global Mobile Satellite Communications Theory. Cham, Switzerland: Springer International Publishing, 2017. 599 p. doi: 10.1007/978-3-319-39171-7</mixed-citation><mixed-citation xml:lang="en">Stojce D. I. Global Mobile Satellite Communications Theory. Cham, Switzerland: Springer International Publishing, 2017, 599 p. doi: 10.1007/978-3-319-39171-7</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Ludwig A. The Definition of Cross Polarization // IEEE Trans. on Antennas and Propagation. 1973. Vol. 21, iss. 1. P. 116–119. doi: 10.1109/TAP.1973.1140406</mixed-citation><mixed-citation xml:lang="en">Ludwig A. The Definition of Cross Polarization. IEEE Trans. on Antennas and Propagation. 1973, vol. 21, iss. 1, pp. 116–119. doi: 10.1109/TAP.1973.1140406</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Многопозиционная система построения микроволнового изображения в режиме реального времени / С. И. Воробьев, В. П. Аверьянов, М. Ю. Осипов, С. Н. Семенов // Сб. статей 13-й Междунар. науч.-практ. конф. "Фундаментальные и прикладные исследования, разработка и применение высоких технологий в промышленности и экономике". Санкт-Петербург, Россия, 24–26 мая 2012. С. 44–47.</mixed-citation><mixed-citation xml:lang="en">Vorobiev S. I., Averyanov V. P., Osipov M. Yu., Semenov S. N. Multi-Position System for Constructing a Microwave Image in Real Time. Collection of articles of the 13th intern. scien. and practical conf. “Fundamental and Applied Research, Development and Application of High Technologies in Industry and Economics”, St. Petersburg, Russia, May 24–26, 2012, pp. 44–47. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Automatic standoff detection of threats in crowed areas / V. Averianov, A. Evsenin, I. Gorshkov, P. Iurmanov, A. Kuznetsov, G. Labzovsky, V. Meshcheryakov, M. Mokhova, S. Semenov, D. Vakhtin, I. Vorobev, S. Vorobyev, D. Kellermann // 9th Future Security. Security Research Conf. Proc., Berlin, Germany, 16–18 Sept. 2014. Stuttgart: Fraunhofer Verlag, 2014. P. 322–329.</mixed-citation><mixed-citation xml:lang="en">Averianov V., Evsenin A., Gorshkov I., Iurmanov P., Kuznetsov A., Labzovsky G., Meshcheryakov V., Mokhova M., Semenov S., Vakhtin D., Vorobev I., Vorobyev S., Kellermann D. Automatic Standoff Detection of Threats in Crowed Areas. 9 th Future Security. Security Research Conf. Proc., Berlin, Germany, 16–18 Sept., 2014. Stuttgart: Fraunhofer Verlag, 2014,pp. 322–329.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Analysis of Elliptical Ridged Waveguide / J. Xu, W. Wang, Y. Gong, Y. Weiz // 2006 Joint 31st Intern. Conf. on Infrared Millimeter Waves and 14th Intern. Conf. on Teraherz Electronics. Shanghai, China, 18–22 Sept. 2006. doi: 10.1109/ICIMW.2006.368473</mixed-citation><mixed-citation xml:lang="en">Xu J., Wang W., Gong Y., Weiz Y. Analysis of Elliptical Ridged Waveguide. 2006 Joint 31st Intern. Conf. on Infrared Millimeter Waves and 14th Intern. Conf. on Teraherz Electronics. Shanghai, China, 18–22 Sept. 2006. doi: 10.1109/ICIMW.2006.368473</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Айзенберг Г. З., Ямпольский В. Г., Терешин О. Н. Антенны УКВ. Ч. 1. М.: Связь, 1977. 384 с.</mixed-citation><mixed-citation xml:lang="en">Aizenberg G. Z., Yampolsky V. G., Tereshin O. N. Antennas VHF. Pt. 1. Moscow, Svyaz’, 1977, 384 p. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Устройства СВЧ и антенны / Д. И. Воскресенский, В. Л. Гостюхин, В. М. Максимов, Л. И. Пономарев; под ред. Д. И. Воскресенского. 2-е изд. М.: Радиотехника, 2006. 376 с.</mixed-citation><mixed-citation xml:lang="en">Voskresenskii D. I., Gostyukhin V. L., Maksimov V. M., Ponomarev L. I. Microwave Devices and Antennas; ed. by D. I. Voskresenskii. 2nd ed. Мoscow, Radiotekhnika, 2006, 376 p. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Tsogkas G. D., Roumeliotis J. A., Savaidis S. P. Cutoff Wavelengths of Elliptical Metallic Waveguides // IEEE Trans. on Microwave Theory and Techniques. 2009. Vol. 57, iss. 10. P. 2406–2415. doi: 10.1109/TMTT.2009.2029636</mixed-citation><mixed-citation xml:lang="en">Tsogkas G. D., Roumeliotis J. A., Savaidis S. P. Cutoff Wavelengths of Elliptical Metallic Wave-guides. IEEE Transactions on Microwave Theory and Techniques. 2009, vol. 57, iss. 10, pp. 2406–2415. doi: 10.1109/TMTT.2009. 2029636</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Nel M., Joubert J., Odendaal J. W. The Measurement of Complex Antenna Transfer Functions for UltraWideband Antennas in a Compact Range // IEEE Antennas and Propagation Magazine. 2014. Vol. 56, iss. 6. P. 163–170. doi: 10.1109/MAP.2014.7011037</mixed-citation><mixed-citation xml:lang="en">Nel M., Joubert J., Odendaal J. W. The Measurement of Complex Antenna Transfer Functions for Ultra-Wideband Antennas in a Compact Range, IEEE Antennas and Propagation Magazine. 2014, vol. 56, iss. 6, pp. 163–170. doi: 10.1109/MAP.2014.7011037</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
