Design of UWB multi-folded patch antenna at UHF band

Abstract

This paper presents the design of a compact ultra-wide-band (UWB) multi-folded patch antenna at UHF Band. The geometry of the antenna is derived from an ordinary L-shaped monopole antenna, with the L- shaped radiating patch folded over the ground plane. Compared to ordinary patch antennas, the proposed design uses a smaller ground plane, resulting into a compact antenna. The design is presented for antenna operating over the frequency range from 250-850 MHz. Simulations are performed using the MoM-based Ansoft Designer CAD software. A prototype antenna is fabricated and tested. The prototype antenna has a 10- dB RL bandwidth of 560 MHz ( 117%) and a gain of 4.1dBi at the centre frequency. The gain variation over the band is 1.8 dB. The features of UWB performance combined with compact form factor make it an attractive candidate for handheld portable UWB systems.