A compact filtering UWB antenna with band-notched function

Abstract

A compact filtering UWB antenna with band-notched function is proposed. The proposed antenna mainly consists a stepped impedance resonator feeding line with low-pass characteristic at the top of the dielectric substrate and two slots at the bottom. The stepped impedance resonator is used to enhance the upper band-edge selectivity, and the narrow slot near the stepped slot is employed to improve the lower band-edge selectivity. What’s more, two microstrip lines paralleling to the feeding line are located at the end of the slot, which can generate the notch band by controlling the length of the current path in two microstrip lines. Compared with the traditional antennas, the proposed antenna is not only smaller in size, but also has better suppression of the in-band and out-of-band interference signals in function.