A logarithmic spiral antenna for polarization and incident angle insensitive broadband electromagnetic wave absorption

Prabir Garu; Wei-Chih Wang

doi:10.1117/12.2613818

7 March 2022 A logarithmic spiral antenna for polarization and incident angle insensitive broadband electromagnetic wave absorption

Prabir Garu, Wei-Chih Wang

Author Affiliations +

Proceedings Volume 12000, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XV; 1200003 (2022) https://doi.org/10.1117/12.2613818
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

To date, there have been very few research on electromagnetic (EM) wave absorption by such antennas in the infrared (IR) region. Therefore, in this article we have proposed a new type of gradient log-spiral antenna to enhance the absorption bandwidth. The unit cell antenna is designed by considering the special arrangements of different log-spiral arms. The unit cell antenna can achieve an average absorption ˃88.5% from 4.5 to 100 THz under normally incident plane waves. The absorption of the antenna is incident angle insensitive up to 45° and polarization independent up to 75° for both the transverse electric (TE) and transverse magnetic (TM) modes. The antenna shows high directivity of 6.68 dBi and high gain of 3.55 dB with 3dB beamwidth 59.2°. Moreover, omnidirectional directivity is observed in both low, mid and high frequencies. This innovative design approach opens a new path for thermal detection, bolometer, and energy harvesting research.

Conference Presentation

Citation Download Citation

Prabir Garu and Wei-Chih Wang "A logarithmic spiral antenna for polarization and incident angle insensitive broadband electromagnetic wave absorption", Proc. SPIE 12000, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XV, 1200003 (7 March 2022); https://doi.org/10.1117/12.2613818

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