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Electronically Tunable Half-Mode Substrate-Integrated Waveguide Coupler
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DOI：10.1109/ACCESS.2026.3654176.png)
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Abstract
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This paper presents the design and implementation of a compact and highly efficient –10 dB directional coupler based on a half-mode substrate integrated waveguide cavity resonator configuration. The proposed structure is based on stub-loaded cavity resonators that are responsible for coupling the desired energy to the auxiliary port. A four-resonator arrangement is used to realize the desired coupling level of –10 dB while maintaining compact dimensions. Experimental validation demonstrates a reflection coefficient better than –15 dB, insertion loss below 1.56 dB, and isolation exceeding 15 dB across the operational bandwidth 4.341-5.26 GHz ( $\boldsymbol {\approx 919}$ MHz bandwidth). Furthermore, a 90-degree phase difference between the through and coupled ports is maintained. The coupler also exhibits tunable coupling characteristics at the coupled port, with experimentally verified coupling levels ranging from 5 dB to 10 dB, highlighting its reconfigurability for adaptive microwave applications.
Keywords:
Coupler
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3.6
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9.8W
Citations:
29.4W
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