A Single-Layer and Compact Circularly Polarized Wideband Slot Antenna Based on ``Bent Feed''

Abstract

Abstract-This communication presents a novel compact and wideband circularly polarized (CP) slot antenna fed by microstrip feedline. The proposed antenna consists of a corner-truncated square-ring slot patch and a novel bent strip. The CP radiation is formed by using the bent strip to excite CP resonance modes. By intruding several open stubs to the corners of the square-ring slot patch, the impedance matching and axial ratio (AR) bandwidth are improved. The measured results show that the proposed antenna has the advantage of wideband characteristics in terms of an impedance bandwidth of 90.59% (3.2-8.5 GHz) and 3-dB axial ratio bandwidth of 84.2% (3.3-8.1 GHz). The principle as well as simulated and measured results of the proposed antenna is revealed.

Printed Circularly Polarised Asymmetric Ultra-Wideband Antenna

“…Moreover, the radiation patterns of the antenna are stable and symmetrical in both XZ and Y Z planes. [6] 25 × 25 × 0.8 3-11.1 5.05-7.1 27.33 [7] 20 × 20 × 0.8 2.95-14 3.73-7.1 44.9 [8] 25 × 25 × 1.6 3.5-9.25 4.6-6.9 30.7 [9] 40 × 40 × 1.0 3.72-9.2 4.5-8.0 46.7 [10] 47.7 × 58 × 0.254 5.0-7.0 5.0-6.0 13.3 [11] 28 × 28 × 1.6 3.25-8 4.4-6.67 30.27 [12] 42 × 44 × 0.8 2.19-4.6 2.2-4.9 24.0 [13] 25 × 25 × 1.5 3.2-8.5 3.3-8.1 64.00 [14] 54 × 54 × 0. These antennas offered omnidirectional patterns and are highly suitable for UWB communication.…”

“…Major design strategies of antennas that have been investigated include an antenna having coplanar wave guide (CPW) fed quasi trapezoidal shaped radiating patch with two semicircular notches and two rectangular notches applied to the diagonal corners of the border ground [5], CPW fed square slot antenna with L-shape and crooked T-shape grounded strips square slot antenna [6], CPW fed square slot antenna with two corners connected by a strip line [7], antenna with a rectangular slot and horizontal stub [8], frequency selective surface backed wideband CP dual slot antenna [9], wideband CP perturbed psi shaped antenna [10], square slot antenna with antipodal Y strip [11], V shaped slot antenna [12], wideband slot antenna based on bent feed [13], slot antenna loaded by a multiple-circularsector patch [14] and a square slot antenna with dual-sense circularly polarized radiation [15]. The highest percentage ARBW coverage of the UWB spectrum obtained by the antennas under study is 64% [13].…”

“…The ground plane size and placement of the slot on the ground plane affect the antenna's behaviour, to a great extent [3]. The conventional design strategies adopted in most of the reported works in literature [5][6][7][8][9][10][11][12][13][14][15] rely on symmetric antenna design technique, where ARBW values obtained do not cover the UWB spectrum to a good extent, with structures of comparable dimensions. Even though 100% ARBW was obtained with spiral and travelling wave structures [2], dimensions of such structures are more than doubled, compared to the proposed antenna in this work.…”

A Circularly Polarized Quad-Band Annular Ring Antenna With Asymmetric Ground Plane Using Theory of Characteristic Modes

“…Nowadays, multiple circularly polarized antennas are replaced by a single antenna which satisfies multiple band operation. Slot antenna [4][5][6][7][8] research has greatly impacted various fields like telecommunication, medical, military, and commercial applications by helping in realizing miniaturized microstrip antennas needed in these areas. Very recently, a triple band circularly polarized antenna has been demonstrated using slot/strips [9].…”

Truncated Circular Microstrip Ultra Wideband Antenna Exhibiting Wideband Circular Polarization

“…Many of the works based on slot antennas could not handle the entire 10-dB impedance bandwidth specified by UWB. Nevertheless, their axial ratio bandwidth covers 50% of the band except for [12] where a smooth bent feed line is introduced to attain wide CP operation (ARBW = 4.8 GHz). This antenna has a moderate gain ranging from 0.81 dBi to 3.56 dBi.…”