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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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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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Angle of arrival estimation using hybrid rat race coupler for X-band applications | The European Physical Journal Plus
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