Article

A Tunable Bandpass-to-Bandstop Reconfigurable Filter With Independent Bandwidths and Tunable Response Shape

Dept. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA
IEEE Transactions on Microwave Theory and Techniques (impact factor: 1.85). 01/2011; DOI:10.1109/TMTT.2010.2086533 pp.3770 - 3779
Source: IEEE Xplore

ABSTRACT The theory of bandpass-to-bandstop reconfigurable filters is developed in this work, and example filters are demonstrated. Designs are developed that allow for reconfigurable response shape and independent bandwidths in the bandpass and bandstop modes of the filter. These capabilities could potentially be useful in dynamic, open spectrums, concurrent transmit-receive systems, and multimode antenna array applications. The demonstrated filters were fabricated using substrate integrated evanescent-mode cavity resonators. The resonators are tuned using deformation of a copper membrane induced by a piezoelectric actuator. In measurement, a 1.06% 3-dB bandwidth bandpass filter with 2.6-dB passband insertion loss was switched to a 0.82% 3-dB S 11 bandwidth bandstop filter with 45 dB of isolation.

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Keywords

1.06% 3-dB bandwidth bandpass filter
 
2.6-dB passband insertion loss
 
bandpass-to-bandstop reconfigurable filters
 
capabilities
 
concurrent transmit-receive systems
 
copper membrane induced
 
demonstrated filters
 
dynamic
 
evanescent-mode cavity resonators
 
example filters
 
multimode antenna array applications
 
open spectrums
 
piezoelectric actuator
 

E.J. Naglich