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An ultra‐wideband surface wave antenna with reduced ground plane effects

This article presents a surface wave based ultra‐wideband antenna. Radiation is obtained from the fast TE0 mode in a dielectric slab. A microstrip line is connected to a triangular patch excites the desired radiating mode. Further, a rectangular ring made off two vertical parallel strips and shorted by periodic metallic vias isolates the radiating structure from other part of the antenna. Thus, it can be easily integrated in a microwave system without any significant coupling with other circuit components. The antenna can be realized in standard printed circuit board (PCB) technology. Two antennas are fabricated with varying size of the metal plane without changing the basic radiator. In both the cases, measured results show that the 10 dB impedance bandwidth remains almost unaffected by the change of ground plane size and always cover 3–11.12 GHz maintaining good radiation characteristics.