New Bandstop Filter Circuit Topology and Its Application to Design of a Bandstop-to-Bandpass Switchable Filter

作者：Lee Juseop^*; Naglich Eric J; Sigmarsson Hjalti H; Peroulis Dimitrios; Chappell William J

来源：IEEE Transactions on Microwave Theory and Techniques, 2013, 61(3): 1114-1123.

DOI：10.1109/TMTT.2012.2237036

• Bandpass filter
• bandstop filter
• filter synthesis
• resonator filter

In this paper, we show a new bandstop filter circuit topology. Unlike conventional bandstop filter circuit topologies, the new circuit topology has inter-resonator coupling structures. The presence of these inter-resonator coupling structures enables convenient switching from a bandstop to a bandpass filter. Using the new bandstop filter topology, this paper demonstrates a design of a frequency-agile bandstop-to-bandpass switchable filter. The filter is composed of tunable substrate-integrated cavity resonators and can be switched to have either a bandstop or bandpass response. Switching is achieved by turning on and off switches placed within the filter structure. A prototype of the proposed design is fabricated and the concept is verified experimentally.

• 出版日期2013-3