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

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5 Author(s)
Juseop Lee ; Department of Computer and Communications Engineering, Korea University, Seoul, Republic of Korea ; Eric J. Naglich ; Hjalti H. Sigmarsson ; Dimitrios Peroulis
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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.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:61 ,  Issue: 3 )