Planar band-notched ultra-wideband antenna with square-looped and end-coupled resonator

Abstract

A square-looped and an end-coupled resonator used in a planar ultra-wideband (UWB) antenna to achieve bandnotched performance are presented here. To obtain notched performance in the wireless local area network band, both the square-looped and end-coupled resonator are designed and placed in a fork-shaped UWB antenna centre. The characteristics and schematic equivalent circuit of each resonator are also discussed. Parametric studies of a fork-shaped antenna with square-looped resonator are given as an example to explore the operating mechanism. Accordingly, the band-notched antenna can effectively select target bands by adjusting different resonator structures. The proposed antenna features flat gainfrequency response and group delay as well as 10-25 dB gain suppression in the notched band.

A state-of-art review on band-notch characteristics in UWB antennas

“…Wu et al, with square loaded resonator and end coupled resonator loaded to the radiating element for generating notch performance. Ojaroudi et al, have obtained frequency band notch performance by incorporating T‐shaped stubs inside a square ring resonator. Two configurations are proposed by a folded T‐shaped element embedded in a fractal radiating patch to eliminate the unnecessary frequency band causing interference …”

Ultra-Wideband Antenna and Design

“…For the printed UWB monopole design, Zhang et al [77] introduced a segmented circular planar monopole antenna with a notched band. Through cutting apart a circular monopole patch with a pair of symmetrical slots, the patch is divided into three segments: the center patch and two side patches.…”

A Compact Printed Slot Antenna with High Out-of-band Rejection for WLAN/WiMAX Applications

“…In order to mitigate the EMIs, printed broadband or ultra-wideband antennas with band notches are very attractive from a design perspective. Various techniques are employed for EMI reduction such as the uses of narrow slits, parasitic strips, and resonator techniques [3][4][5][6][7][8][9][10][11]. Although these printed monopole antennas have the ability to reduce EMIs, many antennas [3], [7][8][9][10][11] were designed by using both sides of the substrates.…”