Al-Khalidi, A. , Alharbi, K. H., Wang, J., Morariu, R. , Wang, L., Khalid, A., Figueiredo, J. and Wasige, E. (2020) Resonant tunnelling diode terahertz sources with up to 1 mW output power in the J-band. IEEE Transactions on Terahertz Science and Technology, 10(2), pp. 150-157. (doi: 10.1109/TTHZ.2019.2959210)
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Abstract
Terahertz (THz) oscillators based on resonant tunneling diodes (RTDs) have relatively low output power, tens to hundreds of microwatts. The conventional designs employ sub-micron sized RTDs to reduce the device self-capacitance and, as a result, realise higher oscillation frequencies. However, reducing the RTD device size leads to lower output power. In this paper we present RTD oscillators which can employ one or two RTD devices of relatively large size, 9 - 25 μm2, for high power and, at the same time, can oscillate at THz frequencies. This is achieved through low resonating inductances realized by microstrip or coplanar waveguide (CPW) transmission line short stubs with low characteristic impedances (Z0), which have lower inductance values per unit length and so compensate the increase of the self-capacitance of large area RTD devices. Thus, fabrication using only photolithography is possible. It is also shown that device sizing, which is limited only by bias stability considerations, does not limit device bandwidth. Further, we report a new way to estimate the RTD oscillator output power with frequency. A series of oscillators with oscillation frequencies in the 245 - 309 GHz range and output powers from 0.1 - 1 mW have been demonstrated showing the feasibility of the proposed approach.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Wasige, Professor Edward and Morariu, Razvan and Wang, Dr Jue and Al-Khalidi, Dr Abdullah |
| Authors: | Al-Khalidi, A., Alharbi, K. H., Wang, J., Morariu, R., Wang, L., Khalid, A., Figueiredo, J., and Wasige, E. |
| College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
| Journal Name: | IEEE Transactions on Terahertz Science and Technology |
| Publisher: | IEEE |
| ISSN: | 2156-342X |
| ISSN (Online): | 2156-3446 |
| Published Online: | 12 December 2019 |
| Copyright Holders: | Copyright © 2019 IEEE |
| First Published: | First published in IEEE Transactions on Terahertz Science and Technology 10(2): 150-157 |
| Publisher Policy: | Reproduced in accordance with the copyright policy of the publisher |
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