Design and Performance Comparison of Various Terahertz Microstrip Antennas on GaN-On-Low Resistivity Silicon Substrates for TMIC

Benakaprasad, B., Eblabla, A., Li, X. , Wallis, D.J., Guiney, I. and Elgaid, K. (2016) Design and Performance Comparison of Various Terahertz Microstrip Antennas on GaN-On-Low Resistivity Silicon Substrates for TMIC. In: 2016 Asia-Pacific Microwave Conference (APMC), New Delhi, India, 5-9 Dec 2016, ISBN 9781509015924 (doi:10.1109/APMC.2016.7931368)

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Abstract

In this paper we demonstrate various configurations of THz microstrip antenna on GaN-on low resistivity silicon substrates (ρ <; 40 Ω.cm). To reduce the losses caused by the substrate and to enhance the antenna performance, the driven patch is shielded by a ground plane and silicon nitride, with BCB as the inset layer between them. Second patch (elevated patch) is suspended in air using gold posts, which makes the design stack configuration. Here, study of various design performances has been represented by changing the shape of the antenna between rectangular and circular, optimising the BCB and stack height and evaluating performance of stack using air and BCB as dielectric. Better fabricated performance was obtained when the patch was elevated in air and by using rectangular-circular stack configuration with BCB and elevation height of 5 μm. 3D EM model showed directivity, gain, and radiation efficiency as high as 8.3 dB, 3.4 dB, and 32 % respectively, a significant improvement over single or stack configuration antenna. Better simulated gain (6.7 dB) was obtained with the BCB height of 30 μm using a single antenna and highest gain and directivity (7.5 dB and 8.8 dB respectively) for stack antenna of height 15 μm. To the authors' knowledge this is the first time such a study has been carried out at Terahertz frequency and this developed technology is suitable for high performance III-V material on low resistivity/high dielectric substrates.

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Benakaprasad, Bhavana and Li, Dr Xu and Eblabla, Mr Abdalla and Elgaid, Dr Khaled
Authors: Benakaprasad, B., Eblabla, A., Li, X., Wallis, D.J., Guiney, I., and Elgaid, K.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
ISBN:9781509015924
Copyright Holders:Copyright © 2017 IEEE
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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