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A high quality factor (Q) microcavity is an efficient device for generating a Kerr comb via a four-wave mixing process inside the cavity [1]. Kerr comb platforms are candidates for such applications as optical frequency combs, optical communications, arbitrary waveform generation, and microwave oscillators. Although a silica toroid microcavity (Fig. 1(a)) also has good characteristics for Kerr comb...
Mobile terminals are required to cover wide range of RF frequencies for the enhancement of mobile communication systems. Thus reconfigurable RF circuits for the terminals attract much attention because they flexibly change many frequency bands under the control of the communication systems. Reconfigurable bandpass filter (BPF) with eight-frequency selection capability has been studied for this goal...
In recent years, RF circuits that can flexibly select many RF frequency bands have been pursued. A two-stage reconfigurable band-pass filter (BPF) with three-bit/eight-frequency selection capability has been proposed for this goal. However, it employs λ/4 resonant mode only, resulting in a limited frequency variable range. This paper proposes a new four-bit reconfigurable resonator employing λ/2 and...
A two-stage three-bit reconfigurable bandpass filter (BPF) using branch-line type resonators has been proposed to achieve low insertion loss. However, it employed transmission line resonators and has limitation for miniaturization. This paper proposes a three-bit reconfigurable resonator consisting of lumped elements. The circuit replaces the short stub with a LC resonant circuit, while open stubs...
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