Kunihiro Kawai

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A single-path configuration and use of single-band devices with distributed reconfigurable matching networks have the potential to achieve the optimum RF front-end for future multi-band mobile terminals. Considering the difficulties in configuring a practical tunable filter as a top filter, collaboration between the filter and low-noise amplifier (LNA) is a(More)
Reconfigurable radio frequency (RF) circuits will be a predominant solution for future global and compact mobile terminals, which supports 2G, 3G, and LTE cellular systems in various frequency bands. A single-path configuration and use of single-band devices with distributed reconfigurable matching networks have the potential to achieve the optimum RF(More)
This paper proposed a reconfigurable resonator and BPF comprising a pair of transmission lines and switches. The proposed resonator provides independent tunability for the bandwidth and resonant frequency. In addition, the number of resonators used in the structure for the BPF can be changed. The prototype BPF changed its center frequency from 6 GHz to 8(More)
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