Triple-Rectangular Band Rejection Monopole Ultrawide-Band Antenna with Spiral Electromagnetic Band-Gap Structures

Abstract

A printed ultrawideband (UWB) monopole antenna with triple-rectangular band rejection characteristics at WiMAX, WLAN, and satellite band is presented in this paper. The frequency selectivity of each rejection band is improved by employing the mutual coupling of two spiral-shaped electromagnetic band-gap (EBG) structures. The proposed design consists of the modified rectangular patch with a compact size of 23.5 × 23 mm2 having a partial ground plane and three pairs of spiral EBGs. To mitigate the interference from the WiMAX band, one pair of the spiral is coupled with the microstrip line, which exhibits band rejection of 3.3–3.7 GHz (11.42%). WLAN band from 5.1 to 5.9 GHz (14.5%) is notched by another pair of spiral EBGs designed on the opposite side of the radiating patch, and for satellite band rejection, two spiral EBGs are embedded on the opposite side of the microstrip line which ranges from 7.25 to 7.8 GHz (7.3%). Moreover, peak gain, radiation pattern, and time domain behavior of the proposed design are also investigated in Ansys Electronics Desktop 17.0 to find its suitability in UWB applications.