Abstract
In this paper, a novel design of bandpass filter with both reconfigurable center frequency as well as controllable fractional bandwidth is presented. Proposed is a three-pole configurable evanescent mode (CEVA) filter that based on low loss Rogers 5880 and consists of two arrays of metallic electromagnetic bandgap (EBG) posts that oriented in both horizontal and vertical direction. In simulation model, all surfaces of the substrate of the filter are plated with copper and with two sets of surface-mount lumped capacitors. One set of the lumped capacitor on the top plate tunes the carrier frequency and another set on the side controls the fractional bandwidth. Both center frequency and fractional bandwidth could be individually tuned. The center frequency of the three-pole filter is tunable from 14.7 GHz to 16.0 GHz and with reconfigurable -3dB fractional bandwidth ranging from 5.2% to 7.0% while maintain consistent insertion loss (IL) throughout tuning.
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