A New Compact Digitally Tuned Filtenna

In this paper, a new topology for a digitally tuned filtenna is proposed. The filtenna response is reconfigured by relying on a bridging digitally tunable capacitor (DTC), which is integrated into the stub of a contained coupled line band-pass filter. The contained tunable band-pass filter constitutes the feeding network of a wideband antenna structure. Activating different DTC states result in altering the electrical length of the band-pass filter's embedded stub. Such alteration tunes the operating frequency of the whole filtenna system and thus yields a narrowband frequency-tunable type of operation. The filtenna maintains acceptable gain figures and minimal distortion in its radiation characteristics across the different DTC configurations.