Improvements in Band Rejection Characteristics of a Wideband Antenna Using Resonant Slots

摘要

This article presents a method to improve and control the band rejection characteristics of wideband bow-tie patch antennas by using two notch slots. The two-pole band rejection characteristics were obtained by adjusting the mutual coupling values, as in a two-pole band rejection filter (BRF), between two horizontal resonant slots on the main patch of the antenna. The wideband antenna itself is composed of an electromagnetically coupled bow-tie patch and a parasitic semicircular ground patch. By adjusting the dimensions of the slots, the other characteristics of the notch response, such as the center frequency and the band rejection skirt gradient, can also be changed. Therefore, optimized slots can give a wideband patch antenna the required rejection band and sharp skirt characteristic, as is often required for ultra-wideband (UWB) antennas and multi-band antennas, compared to the conventional one with or without a notch slot.