Diced and grounded broadband bow‐tie antenna with tuning stub for resonant tunnelling diode terahertz oscillators. Issue 3 (6th December 2016)

• Record Type: Journal Article
• Authors: Alharbi, Khalid Hamed; Khalid, Ata; Ofiare, Afesomeh; Wang, Jue; Wasige, Edward
• Is Part Of: IET microwaves, antennas & propagation. Volume 11:Issue 3(2017)
• Page Start: 310
• Page End: 316
• Publication Date: 2016-12-06
• Subjects: indium compounds -- III‐V semiconductors -- bow‐tie antennas -- broadband antennas -- millimetre wave antennas -- submillimetre wave antennas -- resonant tunnelling diodes -- submillimetre wave oscillators -- permittivity -- lenses -- slot antennas -- electron beam lithography -- antenna radiation patterns -- antenna feeds; diced broadband bow‐tie antenna -- grounded broadband bow‐tie antenna -- tuning stub -- resonant tunnelling diode -- terahertz oscillators -- antenna radiation -- indium phosphide -- dielectric constant -- hemispherical lenses -- ground plane -- substrate effects -- diced substrate -- air‐side direction -- two‐port bow‐tie slot antennas -- power combining -- RTD oscillator circuits -- mutual coupling -- electron beam lithography -- semiinsulating InP substrate -- air‐side radiation pattern -- antenna gain -- antenna feed line -- frequency 230 GHz to 325 GHz -- resistance 50 ohm -- resistance 30 ohm -- InP; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2016.0395
• Languages: English
• ISSNs: 1751-8725

Abstract

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 230–325GHz. Simulations shows air‐side radiation pattern and antenna gain of around 11dB at 280GHz. 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.