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Wideband Band-Stop X-Band Filter Using Electrically Small Tightly Coupled Resonators

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4 Author(s)
Timothy Palomo ; Electrical Engineering Department, University of South Florida, Tampa, FL, USA ; Paul Herzig ; Thomas M. Weller ; Gokhan Mumcu

An electrically small, coupled resonator X-band filter capable of exhibiting a 25% fractional bandwidth band-stop response is presented. Different than the existing designs, the capacitively-loaded open loop resonators of the filter are realized over a 7 μm thin Benzocyclobutene (BCB) layer in order to bring them in close proximity of a microstrip feed line to achieve the desired wideband response. The resonator shape was specifically modified to minimize the width of the filter to 2.5 mm (i.e., λ0/13) at the center frequency of 9.2 GHz in order to be employed within the gaps of a tightly packed tile antenna array. The filter exhibits a measured band-stop performance with > 25 dB insertion loss from 8.1 to 9.64 GHz. Within the band-pass regime (<; 7.3 GHz and > 11.2 GHz), the filter is shown to operate with <; 1.5 dB measured insertion loss.

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:23 ,  Issue: 7 )