Broadband Filtering Antenna with High Selectivity by Using Defected Ground Structure

Abstract

A new design structure of combining band-stop filters and planar antennas is presented in this letter. The slow-wave and band-stop properties of the defective ground structure are exploited in this antenna. The antenna consists of a pair of L-shaped dipole drivers, an unbalanced balun microstrip line, and a fan-shaped metal patch, and a set of complementary splits-ring resonators. Simulation results show, the simulation results show that the impedance bandwidth of the antenna proposed in this paper reaches 40%. Compared with the reference antenna, in the stopband of 5.4-5.5GHZ, the out-of-band isolation is 14dB stronger than the reference antenna.