Tunable MEMS hybrid coupler and L-band tunable filter

Tamotsu Nishino*, Yusuke Kitsukawa, Masatake Hangai, Sang Seok Lee, Shin Nosuke Soda, Moriyasu Miyazaki, Izuru Naitoh, Yoshihiko Konishi


研究成果: Conference contribution

12 被引用数 (Scopus)


Simultaneous control of frequency and coupling coefficient of a directional coupler provides a wide band tunable hybrid coupler. This hybrid coupler is combined with identical two tunable band rejection filters (BRF), to achieve a small-size wide-band tunable band pass filter (BPF). The BPF is called a reflection-type BPF and has a feature of converting rejection frequency bands of the BRF to pass frequency bands. In this paper, we derive the minimum insertion/reflection loss of the lumped element BPF and BRF, considering only the equivalent series resistance (ESR) of tuning devices. The results showed their minimum insertion loss was -5.2dB and reflection loss was -0.35dB if the ESR is 1Ω. Considering the results, we prioritize a reflection-type filter as a prospective low insertion loss tunable BPF. Even though the BRF could be miniaturized and be adapted to wide frequency region by adopting lumped elements, the hybrid coupler might restrict the wide tuning range. Then we propose new tunable hybrid coupler, which alters its coupling coefficient as well as its center frequency, to provide equal transmission and coupling coefficients in wide frequency range. Validation has been done by fabricating tunable BPF composed of 1.2/2GHz selectable MEMS hybrid coupler and 800MHz-2.4GHz seven-band MEMS tunable BRF. The total loss was around -5dB and filter size was as small as 5.2 x 12.3mm2.

ホスト出版物のタイトルIMS 2009 - 2009 IEEE MTT-S International Microwave Symposium Digest
出版ステータスPublished - 2009
イベント2009 IEEE MTT-S International Microwave Symposium, IMS 2009 - Boston, MA, United States
継続期間: 2009 6月 72009 6月 12


名前IEEE MTT-S International Microwave Symposium Digest


Conference2009 IEEE MTT-S International Microwave Symposium, IMS 2009
国/地域United States
CityBoston, MA

ASJC Scopus subject areas

  • 放射線
  • 凝縮系物理学
  • 電子工学および電気工学


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