Printed Monopole Antenna for Ultra-Wideband Application with Tunable Triple Band-Notched Characteristics

In this paper, a compact ultra-wideband (UWB) microstrip-fed printed monopole antenna with triple band-notched characteristics is proposed. The proposed design consists of a radiating patch with two bevels at the bottom edge and the modified ground plane with two bevels of its upper edge to cause the wideband from 3.1 to 10.6 GHz for UWB application. Additionally, a triangular cut is introduced at the upper edge of the ground plane for improving the impedance matching beyond 6 GHz. The band notch at 3.4 GHz is achieved with a pair of slots along patch length and placed symmetrically on both the sides of the patch whereas notch band at 5.2 GHz is achieved using complementary split ring resonator (CSRR) on the patch. The third notch frequency at 5.8 GHz also achieved by using a pair of CSRR on the ground plane. The antenna size is 24 mm × 34.6 mm and designed using FR4 substrate having ε_r = 4.4 and thickness of 0.8 mm. Design and optimizations have been carried out using HFSS v13.0 and there is good agreement with measured results. The proposed antenna exhibits a nearly omni-directional radiation pattern in the H-plane, and a dipole-like radiation pattern in the E-plane for the entire pass band.