volume | PIER Journals

2018-11-06

Polarizations of Crossed-Dipole Antenna Loaded with Different NFRP Elements

Son Xuat Ta

Dr. Son Xuat Ta

School of Electronics and Telecommunications

Hanoi University of Science and Technology

Vietnam

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Progress In Electromagnetics Research M, Vol. 75, 131-140, 2018

doi:10.2528/PIERM18092301

Abstract

In this paper, the polarizations of single-feed crossed-dipole antennas loaded with different near-field resonant parasitic (NFRP) elements are investigated. The antennas are placed above a metallic reflector for a broadside radiation pattern. Meander line with an arrowhead-shaped ending is applied in all arms of the crossed-dipole and NFRP elements for the compactness. By adjusting the ending sizes of the NFRP element, the polarization of antenna can be right-hand circularly polarized (RHCP) - linearly polarized (LP) - left-hand circularly polarized (LHCP). For validation, two antennas with RHCP and LHCP performances are implemented and measured. The RHCP antenna yields a |S₁₁| < -10 dB bandwidth of 1.454-1.668 GHz (214 MHz) and a 3-dB axial ratio (AR) bandwidth of 1.525-1.585 GHz (60 MHz). The LHCP antenna yields a |S₁₁| < -10 dB bandwidth of 1.475-1.702 GHz (227 MHz) and a 3-dB AR bandwidth of 1.535-1.580 GHz (45 MHz). Moreover, both antennas yield a good broadside radiation with a gain of > 6.0 dBic and a radiation efficiency of > 65% across their operational bandwidth.

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Son Xuat Ta, "Polarizations of Crossed-Dipole Antenna Loaded with Different NFRP Elements," Progress In Electromagnetics Research M, Vol. 75, 131-140, 2018.
doi:10.2528/PIERM18092301

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