Dual Band Filtenna Design using Complementary Triangular Split Ring Resonators

A dual band filtering antenna with dimensions 38 mm X 34 mm is demonstrated in this paper capable for use in 5G and WLAN applications. The proposed filtenna consists of complementary triangular split ring resonators (CTSRRs) etched in the ground plane of a microstrip rectangular patch antenna. The antenna is designed to resonate at two frequencies of 3.3 GHz and 5.2 GHz. The CTSRRs are used as a band-reject filter to suppress a higher order spurious harmonic mode. The filtenna structure is designed on FR-4 lossy substrate with copper (annealed) as conducting microstrip lines. The designed filtenna shows good return loss performance, radiation pattern and directivity. Comparison with a triangular split ring resonator (TSRR) loaded antenna is also performed. The simulations are performed using CST Microwave Studio (CST) using Frequency Domain Solver.