An ultra-wide band frequency tuning filtering antenna for P- and L-band applications

An ultra-wide tuning range filtering antenna is proposed in this paper. The frequency tuning range is from 200 MHz to 1.8 GHz which covers from P to L bands by a varactor and two single-pole-doube-throw switches. The switches controls two groups of inductors which corresponding to two frequency tuning range. The filtering antenna has high selectivity and low insertion loss and very wide frequency tuning range.