Researchers at Columbia University in New York have created an rf circulator that works at 25GHz. It uses a non-reciprocal structure – one whose physical characteristics differ depending on the direction of flow. In this case, it has a double ring where section of each ring are either directly-connected or cross-connected by switches. If the ...
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from Electronics Weekly https://www.electronicsweekly.com/news/research-news/single-chip-25ghz-mmwave-circulator-works-without-magnets-2017-10/
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