The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Untuk memahami mekanisme sinaran antena heliks sfera kecil elektrik, kami membangunkan teori tentang ciri sinaran antena. Model analitikal antena yang menganggap arus pada wayar diagihkan secara sinusoid dicadangkan dan dianalisis dengan pengembangan gelombang sfera. Kecekapan sinaran, rintangan sinaran dan corak sinaran diperoleh dalam ungkapan bentuk tertutup. Kecekapan sinaran jelas berbeza dengan luas permukaan wayar dan rintangan sinaran bergantung pada kuasa dua panjang wayar. Hasil yang diperoleh untuk corak sinaran menggambarkan kecondongan corak yang disebabkan oleh mod tidak simetri kepada paksi z. Formula kecekapan sinaran menunjukkan persetujuan yang baik antara simulasi dan hasil pengukuran. Di samping itu, rintangan sinaran hasil teori dan simulasi menunjukkan persetujuan yang baik. Memandangkan kesan struktur suapan antena yang direka, rintangan sinaran model analitik boleh dianggap sebagai hasil yang munasabah. Hasil corak sinaran juga menunjukkan persetujuan yang baik antara simulasi dan hasil pengukuran tidak termasuk sumbangan kecil daripada kabel suapan yang bertindak sebagai penyerak.
Keisuke FUJITA
Maebashi Institute of Technology
Keisuke NOGUCHI
Kanazawa Institute of Technology
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Salinan
Keisuke FUJITA, Keisuke NOGUCHI, "Closed-Form Expression of Radiation Characteristics for Electrically Small Spherical Helix Antennas" in IEICE TRANSACTIONS on Communications,
vol. E106-B, no. 5, pp. 459-469, May 2023, doi: 10.1587/transcom.2022EBP3094.
Abstract: To understand the radiation mechanism of an electrically small spherical helix antenna, we develop a theory on the radiation characteristics of the antenna. An analytical model of the antenna presuming a current on the wire to be sinusoidally distributed is proposed and analyzed with the spherical wave expansion. The radiation efficiency, radiation resistance, and radiation patterns are obtained in closed-form expression. The radiation efficiency evidently varies with the surface area of the wire and the radiation resistance depends on the square of the length of the wire. The obtained result for the radiation pattern illustrates the tilt of the pattern caused by the modes asymmetric to the z-axis. The radiation efficiency formula indicates a good agreement between the simulation and measurement result. In addition, the radiation resistance of the theoretical and simulation results exhibits good agreement. Considering the effect of the feeding structure of the fabricated antenna, the radiation resistance of the analytical model can be treated as a reasonable result. The result of radiation pattern also shows good agreement between the simulation and measurement results excluding a small contribution from the feeding cable acting as a scatterer.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2022EBP3094/_p
Salinan
@ARTICLE{e106-b_5_459,
author={Keisuke FUJITA, Keisuke NOGUCHI, },
journal={IEICE TRANSACTIONS on Communications},
title={Closed-Form Expression of Radiation Characteristics for Electrically Small Spherical Helix Antennas},
year={2023},
volume={E106-B},
number={5},
pages={459-469},
abstract={To understand the radiation mechanism of an electrically small spherical helix antenna, we develop a theory on the radiation characteristics of the antenna. An analytical model of the antenna presuming a current on the wire to be sinusoidally distributed is proposed and analyzed with the spherical wave expansion. The radiation efficiency, radiation resistance, and radiation patterns are obtained in closed-form expression. The radiation efficiency evidently varies with the surface area of the wire and the radiation resistance depends on the square of the length of the wire. The obtained result for the radiation pattern illustrates the tilt of the pattern caused by the modes asymmetric to the z-axis. The radiation efficiency formula indicates a good agreement between the simulation and measurement result. In addition, the radiation resistance of the theoretical and simulation results exhibits good agreement. Considering the effect of the feeding structure of the fabricated antenna, the radiation resistance of the analytical model can be treated as a reasonable result. The result of radiation pattern also shows good agreement between the simulation and measurement results excluding a small contribution from the feeding cable acting as a scatterer.},
keywords={},
doi={10.1587/transcom.2022EBP3094},
ISSN={1745-1345},
month={May},}
Salinan
TY - JOUR
TI - Closed-Form Expression of Radiation Characteristics for Electrically Small Spherical Helix Antennas
T2 - IEICE TRANSACTIONS on Communications
SP - 459
EP - 469
AU - Keisuke FUJITA
AU - Keisuke NOGUCHI
PY - 2023
DO - 10.1587/transcom.2022EBP3094
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E106-B
IS - 5
JA - IEICE TRANSACTIONS on Communications
Y1 - May 2023
AB - To understand the radiation mechanism of an electrically small spherical helix antenna, we develop a theory on the radiation characteristics of the antenna. An analytical model of the antenna presuming a current on the wire to be sinusoidally distributed is proposed and analyzed with the spherical wave expansion. The radiation efficiency, radiation resistance, and radiation patterns are obtained in closed-form expression. The radiation efficiency evidently varies with the surface area of the wire and the radiation resistance depends on the square of the length of the wire. The obtained result for the radiation pattern illustrates the tilt of the pattern caused by the modes asymmetric to the z-axis. The radiation efficiency formula indicates a good agreement between the simulation and measurement result. In addition, the radiation resistance of the theoretical and simulation results exhibits good agreement. Considering the effect of the feeding structure of the fabricated antenna, the radiation resistance of the analytical model can be treated as a reasonable result. The result of radiation pattern also shows good agreement between the simulation and measurement results excluding a small contribution from the feeding cable acting as a scatterer.
ER -