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A tuneable rat-race coupler for full duplex communications | International Journal of Microwave and Wireless Technologies | Cambridge Core
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Miniaturized filtering rat‐race coupler based on hybrid circular substrate integrated waveguide and coplanar waveguide resonators - Wang - 2022 - International Journal of RF and Microwave Computer-Aided Engineering - Wiley Online Library
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Figure 1 from Miniaturized rat-race coupler with bandpass response and good stopband rejection | Semantic Scholar
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Figure 1 from A compact dual-mand metamaterial-based rat-race coupler for a MIMO system application | Semantic Scholar
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