Wideband Circularly Polarized Slotted-Patch Antenna With a Reflector

IET Microwaves, Antennas & Propagation

Gong

2017

A broadband circularly polarised antenna with a compact structure is proposed based on a microstrip‐coplanar waveguide (CPW) fed rectangular slot antenna. The wideband feeding network power divider (PD) consists of a Wilkinson PD and a 90° phase difference comparator. The even modes of four CPW feed lines are generated to provide equal amplitudes but in phase quadrature. Circular polarisations can be excited over a very broad frequency band. A reflector is added to the antenna structure to improve the antenna gains. The inverted configuration, which places the reflector in the slot side, is ultilised to enhance the impedance matching. The measured impedance bandwidth for |S11| < −10dB is 74.4%. A broad 3‐dB axial ratio bandwidth of 70.8% is also obtained. The measured 3‐dB gain bandwidth is 53.65% with the peak gain of 7.4 dBic.

Section: Comparison With Other Broadband Cp Antennasmentioning

confidence: 87%

“…Printed slot antennas have received much attention for their inherent wideband properties and low profile. A microstrip fed slotted-patch antenna with circular polarisation is proposed in [6]. The antenna has a 3-dB AR bandwidth of 53%.…”

Section: Introductionmentioning

confidence: 99%

Broadband microstrip‐CPW fed circularly polarised slot antenna with inverted configuration for L‐band applications

IET Microwaves, Antennas & Propagation

Gong

2017

“…Due to their significant merits, circularly polarized (CP) antennas have widely been used in various wireless communication systems, such as satellite communications, mobile communications, radio frequency identification, wireless power transmission and local area networks . Some techniques have been used to feed the CP antenna.…”

Section: Introductionmentioning

confidence: 99%

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

Int J RF Microw Comput Aided Eng

Kong

et al. 2020

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

“…For example, a circular slot antenna with a fractal slot geometry in the slot has been reported in Reference with an ARBW of 21.81% and impedance bandwidth of 25.47%. A 53% 3‐dB ARBW has been achieved in Reference by rectangular slotted‐patch antenna with metallic reflector for unidirectional radiation. A single feed with circular and meandered slotted patch antenna has been employed in Reference to realize an enhanced ARBW of 2.3% and 4.6% of impedance bandwidth for GPS applications.…”

Section: Introductionmentioning

confidence: 99%

A wideband circularly polarized slot antenna with antipodal strips for WLAN and C‐band applications

Rasool

Muhammad

Int J RF Microw Comput Aided Eng

2019

A single-fed circularly polarized square shaped wide slot antenna with modified ground plane and microstrip feed has been presented. The field in the slot is perturbed by introducing an antipodal strips section attached with a microstrip line to produce circular polarization in a wide band of frequencies. The antipodal strip section consists of a group of four strips of unequal length and separation. The presence of asymmetric perturbations in the slot is mainly responsible for exciting two orthogonal modes in the slot having equal magnitude and 90 phase difference which results in circular polarization. A wide bandwidth of 3.3 GHz (4.4 GHz-7.7 GHz) has been achieved for an axial ratio value AR < 3 dB with the minimum axial ratio value being 0.3 dB. The impedance bandwidth for |S 11 | < −10 dB ranges from 4.3 GHz to 8 GHz, and therefore covers most of the C-band communication systems. The antenna exhibits stable radiation patterns throughout the circular polarization bandwidth with a gain around 6 dBi in entire operational bandwidth. A prototype of antenna was fabricated and measured. The antenna has a planar size 0.40λ 0 × 0.40λ 0 and thickness of 0.02λ 0 where λ 0 is the wavelength in free space at the lowest frequency. With its compact size and low profile, the antenna is a favorable choice for WLAN (5.15-5.85 GHz) and a wide variety of Cband wireless applications. K E Y W O R D SARBW, circular polarization, microstrip-fed slot, slot antenna, wideband