A Broadband Filtering Patch Antenna Using T-Probe, Transverse Stubs, and U-Slots

This paper presents a broadband filtering patch antenna. This antenna consists of a rectangular patch, a rectangular ground plane, and an upright substrate. A coplanar waveguide (CPW) with T-probe is printed on the front side of the substrate, which can engender the broadband characteristic. On the back side, two transverse stubs cross the slots of CPW. The two transverse stubs can not only broaden the bandwidth but also improve the selectivity of the realized gain and reflection coefficient. Two U-slots are etched on the patch for providing a radiation null at the lower band edge as well as increasing the selectivity of out-of-band edge. Ultimately, an impedance bandwidth of 71.17% (2.48–5.22 GHz) and an average realized gain of 4.2 dBi are obtained. Moreover, two radiation nulls occur at 2.25 and 5.3 GHz. The simulated results are in good agreement with the measured results.