Dielectric Characterization and Optimization of Wide-band, Cavity-Backed Spiral Antennas

作者

  • Nahid Rahman High Frequency Materials Measurement and Information Center Tufts University, 161 College Avenue, Medford, Massachusetts 02155, USA
  • Anjali Sharma High Frequency Materials Measurement and Information Center Tufts University, 161 College Avenue, Medford, Massachusetts 02155, USA
  • Mohammed Afsar High Frequency Materials Measurement and Information Center Tufts University, 161 College Avenue, Medford, Massachusetts 02155, USA
  • Sandeep Palreddy Microwave Engineering Corporation, 1551 Osgood Street, North Andover, Massachusetts 01845, USA
  • Rudolf Cheung Microwave Engineering Corporation, 1551 Osgood Street, North Andover, Massachusetts 01845, USA

关键词:

Dielectric Characterization and Optimization of Wide-band, Cavity-Backed Spiral Antennas

摘要

This paper presents a novel approach to facilitate the design of wideband, cavity-backed spiral antennas. Using this approach, first, a 2-18 GHz, two-arm cavity backed Archimedean spiral antenna has been designed in FEKO. A multilayer dielectric absorber has been introduced in the cavity to facilitate unidirectional operation of the antenna. In order to incorporate the frequencydependent complex permittivity data of the absorbing materials inserted in the cavity, precise microwave instrumentation has been used to determine these parameters experimentally. Based on this data, a genetic algorithm optimization procedure has been applied to derive the most favorable geometry of the absorbing cavity. Our results show that a design thus optimized significantly improves key performance parameters, maximizes the co-polarized gain, and minimizes the cross-polarized gain of the antenna across its operational bandwidth. We have then extended the approach to the design of a zigzagged 2-arm Archimedean spiral antenna and also a 1.5:1 ratio elliptical spiral antenna and presented the radiation characteristics here.

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参考

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已出版

2022-05-02

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[1]
N. . Rahman, A. . Sharma, M. . Afsar, S. . Palreddy, 和 R. . Cheung, 《Dielectric Characterization and Optimization of Wide-band, Cavity-Backed Spiral Antennas》, ACES Journal, 卷 26, 期 2, 页 123–129, 5月 2022.

期

2011: Vol 26 Iss 2

栏目

General Submission