Dual-Band Circularly Polarized Cavity-Backed Crossed-Dipole Antennas

Int J RF Microw Comput Aided Eng

2019

This paper presents a new approach to design dual‐band antenna with dual‐sense circularly polarized (CP) operation. A principle for CP radiation is the use of two orthogonal dipoles and properly choosing their lengths can produce either right‐hand CP (RHCP) or left‐hand CP (LHCP) operation. In the proposed structure, the lower frequency band at 2.4 GHz is designed with RHCP radiation and LHCP is the operating mode of the higher band at 3.5 GHz. For verification, an antenna prototype is fabricated and measured. Measured data indicate that good performances over the RHCP and LHCP bands can be obtained with usable bandwidths of 2.9% (2.36‐2.43 GHz) and 1.7% (3.48‐3.54 GHz). Along with this, it also observes good unidirectional radiation patterns and the measured broadside gains are around 7.7 and 7.4 dBic across these frequency ranges.

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Dual‐band dual‐sense circularly polarized antenna based on crossed dipole structure for WLAN/WiMAX applications

Int J RF Microw Comput Aided Eng

2019

“…In terms of gain, high gain radiation over very wide frequency band can be obtained by proper tuning the cavity's shape. This method has been investigated in References , thus the procedure to optimize the cavity's dimensions is not necessary to present in this article.…”

Section: Full Band Uwb Dual‐polarized Antennamentioning

confidence: 99%

Ultrawideband high‐gain dual‐polarized antenna with anti‐interference capability

Int J RF Microw Comput Aided Eng

2019

In this article, a high‐gain dual‐polarized antenna with band‐rejection capability for ultrawideband (UWB) applications is proposed. Tapered dipoles are chosen as a primary radiator to achieve UWB operation and it is reflected by a metallic cavity reflector for high gain radiation. A notch at WLAN band is realized by etching a set of four bent slots in the radiating elements. The measured results demonstrate that the proposed design with overall dimensions of 0.69λ L × 0.69λ L × 0.16λ L (λ L is free‐space wavelength at the lowest operating frequency) has operating bandwidth of 95.1% (3.2‐9.0 GHz) and the rejected frequency band from 5.0 to 5.9 GHz. Additionally, good unidirectional radiation patterns with a broadside gain from 8.1 to 11.5 dBi and radiation efficiency of better than 90% are also achieved.

“…The drawback of these antennas is their bi-directional radiation, which causes low broadside gain and is not suitable for many applications where unidirectional patterns are required. Cavity-backed antennas have been proposed to yield unidirectional radiation, a higher gain, and a better front-to-back ratio [6,7]. However, a relatively large antenna height is required to achieve good performance for these antennas.…”

Section: Introductionmentioning

confidence: 99%

A Dual-Wideband Circularly Polarized Antenna Using an Artificial Magnetic Conductor

Antennas Wirel. Propag. Lett.

Park

2016

A dual-wideband circularly polarized (CP) antenna was proposed based on the strategy of combining multi-mode resonances. The primary radiators were two barbed-shape dipoles and two bowtie dipoles printed on the same substrate. They were placed over an artificial magnetic conductor (AMC) for the low-profile antenna design purpose. Properly combining the fundamental mode of the barbed-shape dipole, the bowtie mode, the slot mode, the second mode of a barbed-shape dipole and extra resonance generated by the AMC surface, a dual-wideband operation can be achieved. The final design with an overall size of 0.64 λ o × 0.64 λ o × 0.16 λ o at 2.4 GHz had measured impedance bandwidth of 40% (2-3 GHz) and 49.5% (3.8-6.3 GHz) for the lower and upper bands, respectively. The measured 3 dB axial ratio bandwidths were 19.3% (2.25-2.73 GHz) and 33.8% (4.3-6.05 GHz) for the lower and upper bands, respectively. The antenna performed an average gain of about 6.6 dBic across the low CP region and 7.4 dBic across the high CP region.Index Terms-circular polarization, dual band, broadband, artificial magnetic conductor, crossed dipole 1536-1225 (c)