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A ring‐filter switch is suggested for a low loss wideband filter with on‐state and very sharp bandstop filter with off‐state. It consists of a ring filter and a switching diode. The ring filter is a wideband filter but a band‐stop filter with a certain condition. The fact can be used as a switch. To verify it, a microstrip ring‐filter switch is fabricated and measured at a center frequency of 3 GHz.
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Ahn et al. (2007) studied this question.
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