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Implementation of tunable resonators in planar groove gap waveguide technology

Published online by Cambridge University Press:  22 April 2021

Titus Oyedokun Open the ORCID record for Titus Oyedokun [Opens in a new window] ,
Riana H. Geschke  and
Tinus Stander
Titus Oyedokun*
Affiliation:
Department of Electrical Engineering, University of Cape Town, Cape Town, South Africa
Riana H. Geschke
Affiliation:
Department of Electrical Engineering, University of Cape Town, Cape Town, South Africa Fraunhofer Institute for High Frequency Physics and Radar Techniques FHR, Wachtberg, Germany
Tinus Stander
Affiliation:
Department of Electrical, Electronic and Computer Engineering, Carl and Emily Fuchs Institute for Microelectronics, University of Pretoria, Pretoria, South Africa
*
Author for correspondence: Titus Oyedokun, E-mail: oydtit001@myuct.ac.za
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Abstract

We present a tunable planar groove gap waveguide (PGGWG) resonant cavity at Ka-band. The cavity demonstrates varactor loading and biasing without bridging wires or annular rings, as commonly is required in conventional substrate-integrated waveguide (SIW) resonant cavities. A detailed co-simulation strategy is also presented, with indicative parametric tuning data. Measured results indicate a 4.48% continuous frequency tuning range of 32.52–33.98 GHz and a Qu tuning range of 63–85, corresponding to the DC bias voltages of 0–16 V. Discrepancies between simulated and measured results are analyzed, and traced to process variation in the multi-layer printed circuit board stack, as well as unaccounted varactor parasitics and surface roughness.

Keywords

Groove gap waveguideplanar waveguidesubstrate-integrated waveguide
Type
Metamaterials and Photonic Bandgap Structures
Information
International Journal of Microwave and Wireless Technologies , Volume 14 , Issue 4 , May 2022 , pp. 438 - 444
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press in association with the European Microwave Association

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