Broadband suspended plate antenna with vertical grounded wall

A novel feeding scheme was proposed to feed a suspended plate antenna for broadband applications and investigated experimentally. The feeding consists of a thin vertical dielectric slab. One of two surfaces of the slab was completely covered by a grounded wall and a probe-fed strip was etched onto other surface. The two prototypes with square and circular plates fed by the proposed feeding were designed and fabricated. Both square and circular plates were put parallel to the ground plane and perpendicular to the grounded walls. The plates were fed by the probe-fed strips at the midpoints of their edges close to the grounded wall. The input impedance and radiation patterns of the antennas were examined experimentally. The results showed that 50% bandwidth were achieved and radiation patterns were similar to those of the planar inverted-L or -F antennas