Quasi-self-complementary ultra-wideband antenna with band rejection characteristics

Abstract

This article presents a compact novel quasi-self-complementary semi-octagonal-shaped antenna for ultra-wideband (UWB) application. The proposed novel structure is fed by a microstrip line where different rectangular truncation is etched to the ground plane as an impedance matching element, which results for much wider impedance bandwidth (VSWR<2) from 2.9 to 20 GHz. In order to obtain band-notched characteristics at 5.5 GHz, an open-ended, quarter wavelength, spiral-shaped stub is introduced in the vicinity of the truncated part of the ground plane. An equivalent circuit model is adopted to investigate the band rejection characteristics of the ground plane stub. Sharpness of the rejection band can be controlled by maintaining the gap between stub resonator and the slotted periphery of ground plane. The proposed antenna design is validated by experimental measurements.

Half Hexagonal Shaped UWB antenna with triple band notch using resonating structures for wireless communication

“…Various methods have been proposed to achieve band-notch characteristics [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The most common technique is to cut a slot on the patch or the feed line and the ground plane.…”

“…In this, the position and size of the slot determine the middle frequency and the bandwidth of the notch. In slot techniques, a quarterwavelength or half wavelength of different shapes such as U-shaped, L-shaped, split ring resonators are cut in the patch or the ground plane [2][3][4][5][6][7][8][9][10][11][12]. Although the slot methods are efficient in generating band notches, only single or double notches can be produced [3].…”

A printed multiband quasi‐self‐complementary antenna for broadband applications

“…Similarly, a compact semi-octagonal-shaped QSCA has a wideband from 2.9 to 20 GHz. 11 In Reference 12, a QSCA with a rectangular strip inserted in the ground plane is presented for UWB systems. Except for these UWB QSCAs, uniplanar printed QSCAs with dual-band operation in WLAN are proposed and investigated in References 13-15.…”

“…Recently, some applications of ultra‐wideband (UWB) QSCAs have been reported in References 8–12. A bow‐tie QSCA is proposed with a bandwidth from 3.04 to 11.47 GHz in Reference 8.…”

“…A printed QSCA fed by a microstrip line is proposed in Reference 10, a triangular slot is etched on the ground to improve the impedance characteristics of the antenna. Similarly, a compact semi‐octagonal‐shaped QSCA has a wideband from 2.9 to 20 GHz 11 . In Reference 12, a QSCA with a rectangular strip inserted in the ground plane is presented for UWB systems.…”