A modified split ring resonator based printed compact monopole UWB antenna with spiked elliptical radiator having five band rejection features

Abstract

A coplanar waveguide (CPW) fed printed compact monopole antenna with five band rejection features is presented. Wide bandwidth was achieved by beveling the lower part and adding a modified ellipse on the upper portion of the patch. An inverted circular arc, single circular split ring resonator (SRR) with wide opening and two symmetrical circular single SRRs were embedded for obtaining three stop-band characteristics. Two symmetrical slits were inculcated in the ground forming defected ground structure (DGS) to get another stop-band characteristic. Two concentric rectangular modified SRRs were etched to obtain a higher frequency stop-band feature. The proposed antenna was designed, fabricated, and experimentally tested for the validation of results. The overall dimensions of the proposed antenna were 29 mm ×24 mm × 1.6 mm. The measured impedance bandwidth of the antenna was 2.87 to 13.3 GHz at | S11|< − 10 dB. The measured results show that the proposed antenna has five band notches centred at 3.96, 4.35, 5.7, 8.54, and 9.95 GHz to reject WiMAX band (3.65-4.04 GHz), ARN band (4.29-5.18 GHz), WLAN band (5.5-6.9GHz), ITU-8 band (7.37-8.87), and amateur radio band (9.2-10.3 GHz) respectively. The proposed antenna maintains omnidirectional radiation pattern in H-Plane and dumbbell-shape radiation pattern in E-plane. Further, stable gain over the whole UWB except at notched frequency bands was reported.