Diced and grounded broadband bow-tie antenna with tuning stub for resonant tunnelling diode terahertz oscillators

Alharbi, K. H., Khalid, A. , Ofiare, A., Wang, J. and Wasige, E. (2017) Diced and grounded broadband bow-tie antenna with tuning stub for resonant tunnelling diode terahertz oscillators. IET Microwaves, Antennas and Propagation, 11(3), pp. 310-316. (doi:10.1049/iet-map.2016.0395)

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Abstract

Radiation from antennas integrated with indium phosphide (InP)-based resonant tunnelling diode (RTD) oscillators is mainly through the substrate because of the effects of the large dielectric constant. Therefore, hemispherical lenses are used to extract the signal from the backside of the substrate. In this study the authors present a broadband bow-tie slot antenna with a tuning stub which is diced and mounted on a ground plane to alleviate the substrate effects. Here, the large dielectric constant substrate around the antenna conductor is removed. In addition, the ground plane underneath the diced substrate acts as a reflector and, ultimately, the antenna radiates to the air-side direction. Antenna integration with RTD oscillators is described in this study as well. Two-port bow-tie slot antennas were designed and characterised and showed the suitability of integration with power combining RTD oscillator circuits which are based on mutual coupling. The antennas were fabricated using electron beam lithography on a semi-insulating InP substrate. Simulated and measured bandwidth almost extends the entire frequency range 230–325  GHz. Simulations shows air-side radiation pattern and antenna gain of around 11  dB at 280  GHz. Simulations also show that the antenna may be fed with a 50-Ω or 30-Ω feed line, i.e. suitable feed lines, without compromising its performance which may prove beneficial for optimum loading of RTD oscillators.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Wasige, Professor Edward and Wang, Dr Jue and Ofiare, Dr Afesomeh and Khalid, Dr Ata-ul-Habib and Alharbi, Khalid
Authors: Alharbi, K. H., Khalid, A., Ofiare, A., Wang, J., and Wasige, E.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IET Microwaves, Antennas and Propagation
Publisher:Institution of Engineering and Technology
ISSN:1751-8725
ISSN (Online):1751-8733
Published Online:30 September 2016
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in IET Microwaves, Antennas and Propagation 11(3):310-316
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
585691Compact MMIC Teraherz Sources in the 0.1-1 THz RangeEdward WasigeEngineering & Physical Sciences Research Council (EPSRC)EP/J019747ENG - ENGINEERING ELECTRONICS & NANO ENG
671271iBROW - Innovative ultra-BROadband ubiquitous Wireless communications through terahertz transceiversEdward WasigeEuropean Commission (EC)UNSPECIFIEDENG - ENGINEERING ELECTRONICS & NANO ENG