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A tunable 3-D filter/antenna integration implementation is presented herein. The tunable integrated device consists of a tunable coaxial substrate integrated waveguide (SIW) resonator coupled to a tunable cavity-backed slot antenna. The filter/antenna synthesis presented in this work follows closely with traditional filter synthesis with the antenna coupling energy to free space used as the second...
This paper presents a vertically-integrated second-order tunable planar filter/antenna that expands upon previous work with tunable filter/antennas. This work demonstrates the use of a radiating element as a resonator in the filter and uses mixed electric and magnetic coupling to achieve a constant absolute bandwidth over the filter tuning range without the need of additional tuning elements on the...
A high-Q 3-D filter/antenna integration is presented herein. The filter/antenna is composed of a surface gap ring resonator and a cavity-backed slot antenna, where the slot antenna has a narrower bandwidth than the filter causing it to behave as a resonator and contribute a pole to the filtering function. The filter/antenna operates at a center frequency of 3.75 GHz with a fractional bandwidth of...
An electrically tunable planar hairpin filter integrated with a microstrip patch antenna is proposed in this paper. The patch antenna is integrated as a resonator, contributing to a second-order filter. The integration is performed to eliminate 50-ohm transition losses and reduce the overall structure size. The antenna is magnetically coupled to the hairpin resonator and operates at a center frequency...
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