Bandwidth enhancement of a circularly polarized tapered crossed slot antenna with corner parasitic directors

Abstract

This paper presents a single-feed wideband circularly polarized (CP) antenna with tapered crossed slots and corner directors. According to the multimode resonance concept, the antenna uses two identical cross placed Vivaldi-like tapered slots as the wideband radiating elements, and four rectangular parasitic patch directors are connected on each corner of the ground for further enhancing the bandwidth. A simple second-order stepped microstrip line with a via on the other side of the substrate is used to feed the antenna. Two pairs of capacitors and inductors are placed on each slot to realize a 90 phase difference for CP operation. The proposed antenna is designed, fabricated and measured. Simulation results are in good agreement with the measured results that demonstrate a 10 dB impedance bandwidth (IMBW) from 1.98 to 5.71 GHz (3.73 GHz, 97.01%) and a 3 dB axial ratio bandwidth (ARBW) from 2.13 to 3.91 GHz (1.78 GHz, 58.94%). The antenna outperforms most of the reported cross slot antennas for its wide IMBW and ARBW. K E Y W O R D Smulti-mode resonance, parasitic patch directors, wideband circularly polarized (CP) antenna

Broadband Circular Polarised Printed Antennas for Indoor Wireless Communication Systems: A Comprehensive Review

“…As reported by Jhajharia et al [137], a shorting pin was used to c nect the horizontal arm of a radiator patch to a rectangular stub on a modified gro plane to increase the physical dimension of the horizontal arm and thereby provide other path for the current rotation. However, the use of a shorting pin to expand the band results in a low isolation between the achieved bidirectional radiation patte Hence, the application of this technique to microstrip indoor antennas is limited beca of the importance of bidirectional radiation patterns in IWC systems [21].…”

“…However, the use of a shorting pin to expand the CP band results in a low isolation between the achieved bidirectional radiation patterns. Hence, the application of this technique to microstrip indoor antennas is limited because of the importance of bidirectional radiation patterns in IWC systems [ 21 ].…”

“…Printed antennas are receiving considerable attention with regard to their use in indoor environments because of their compact size, low profile, simple design, uncomplicated design and fabrication and low production cost [ 10 , 16 , 17 , 18 ], in addition to their capabilities of generating CP waves whilst retaining a compact antenna size [ 19 , 20 ] and providing bidirectional radiation patterns, RHCP and LHCP; these properties are essential for antennas which are used in indoor environments [ 21 ]. However, these types of antennas suffer from the difficult trade-off between the achieved IBW and axial ratio bandwidth (ARBW) and their size [ 22 , 23 , 24 , 25 , 26 ].…”

A wide circularly polarized dual‐band isosceles trapezoidal monopole antenna with modified ground plane

“…But single‐feed CP antenna has a constraint of narrow 3‐dB axial ratio BW. Various single‐fed monopole CP antennas with different configuration have been designed in the recent few years 8–14 …”

“…Various single-fed monopole CP antennas with different configuration have been designed in the recent few years. [8][9][10][11][12][13][14] In this paper, an isosceles trapezoidal monopole antenna (ITMA) with dual broadband characteristics of impedance bandwidth (IBW) and a single wideband axial ratio bandwidth (AR BW) is proposed. The antenna is designed on a single layer, single microstrip line feed configuration, and low-cost substrate (FR4).…”