Electronically switchable microstrip bandpass filter with good selectivity

Po Ying Chang, Yo Shen Lin

研究成果: 書貢獻/報告類型會議論文篇章同行評審


In this work, an electronically switchable cross-coupled microstrip bandpass filter using p-i-n diodes is proposed. The basic filter structure is based on the cascade of λ/8 parallel and anti-parallel coupled-line sections. Therefore, it occupies only about half the circuit size of conventional parallel-coupled filters. The magnetic cross-coupling is also introduced to achieve two transmission zeros in the lower and upper stopbands. In addition, by employing the four-line anti-parallel coupled microstrip structure, two more transmission zeros in the upper stopband are obtained. Two p-i-n diodes along with a common bias control circuitry are then introduced to allow the bandpass filter to be switched on and off. For design purpose, suitable equivalent-circuit for the filter is also introduced. Specifically, a switchable 4th-order microstrip bandpass filter with a center frequency of 1.5 GHz, passband insertion loss less than 2 dB, 3-dB bandwidth of 19.5%, and four transmission zeros is demonstrated. The ON-OFF isolation is better than 20 dB from dc up to 4.3 GHz.

主出版物標題Asia-Pacific Microwave Conference Proceedings, APMC 2011
出版狀態已出版 - 2011
事件Asia-Pacific Microwave Conference, APMC 2011 - Melbourne, VIC, Australia
持續時間: 5 12月 20118 12月 2011


名字Asia-Pacific Microwave Conference Proceedings, APMC


???event.eventtypes.event.conference???Asia-Pacific Microwave Conference, APMC 2011
城市Melbourne, VIC


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