Wideband Circularly Polarized Antenna With Gain Improvement

Zhang, Zhi-Ya; Liu, Neng‐Wu; Zhao, Jie; Fu, Guang

doi:10.1109/lawp.2013.2253591

Cited by 86 publications

(40 citation statements)

References 10 publications

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“…It has been widely used in both military and civilian fields. Reconfigurable antenna can be divided to frequency reconfigurable antennas, pattern re-configurable antennas, polarized re-configurable antennas and now hybrid reconfigurable antennas have been developed [1][2][3]. Polarized re-configurable antennas have anti-multipath fading effect and have the advantages of improving frequency reuse [4,5].…”

Section: Introductionmentioning

confidence: 99%

Design and simulation of a novel circularly polarized antenna with polarization reconfigurable characteristics

Zhang

et al. 2016

MATEC Web of Conferences

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Abstract.A novel circularly polarized antenna with polarization reconfigurable characteristics was designed using co-simulation of Ansoft HFSS and Designer software. It consists of a dual-polarized antenna and phase switching network which act as the feed network for the dual-polarized antenna. The phase switching network was designed based on a Wilkinson power divider, where the output port was connected with SPDT to form a switching network. By controlling the SPDT state-off / on, the phase difference of the two ports could be alternated, which generated the orthogonal modes between the two ports of dual-polarized antenna. So that Left-hand circular polarization (LHCP) and Right-hand circular polarization (RHCP) could be achieved. The simulation shown that reflection coefficient was less than -12 dB and the axial ratio was below 3 dB between 1.8 GHz and 2.4 GHz with polarization reconfigurable characteristics.

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Section: Introductionmentioning

confidence: 99%

Design and simulation of a novel circularly polarized antenna with polarization reconfigurable characteristics

Zhang

et al. 2016

MATEC Web of Conferences

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“…In [24], a dual-fed crossed-dipole antenna achieved an axial-ratio (AR) bandwidth of 51.8%. The method of using two modes of a quadrature-fed dielectric resonator antenna enhanced the CP bandwidth (AR 4 dB) to 32.8% as presented in [25].…”

Section: Introductionmentioning

confidence: 99%

Wideband Magnetoelectric Dipole Antennas With Dual Polarization and Circular Polarization

Luk

2015

IEEE Antennas Propag. Mag.

103

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A new AE45 dual-polarized magnetoelectric dipole antenna is proposed. The antenna is excited by two À-shaped probes placed at a convenient location. The measured overlapped impedance bandwidth is 48% with standing-wave ratio (SWR) 1.5 from 1.69 to 2.76 GHz. The measured gains vary from 7.6 to 9.3 dBi and from 7.6 to 9.4 dBi for port 1 and port 2, respectively. The isolation between the two ports is larger than 30 dB. The proposed antenna achieves a low cross-polarization level of less than À21 dB and a low back radiation level of less than À29 dB over the operating frequency range. With a broadband 90 phase shifter and a power divider, the proposed antenna can radiate circularly-polarized (CP) wave and exhibit a wide impedance bandwidth (SWR 2) of 90% from 1.23 to 3.23 GHz, which covers the whole 3-dB axial-ratio (AR) bandwidth of 82% from 1.28 to 3.05 GHz. In this operation frequency band, the proposed CP antenna has a broadside gain of larger than 5 dBi above 1.45 GHz. Considering the common overlapped bandwidth limited by the impedance, AR, and gain, the proposed antenna exhibits an effective bandwidth of 71%.

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“…In order to meet these requirements, multi-feed configurations have been proposed in several antennas recently, including a 90 • hybrid feed network [6], a switch line balun [7] and a Γ-shaped feed [8]. However, these structures are complicated, and single-feed configurations are preferred.…”

Section: Introductionmentioning

confidence: 99%

A Dual-Broadband Circularly Polarized Antenna With Unidirectional Radiation Pattern

Liu¹,

Yao²,

Zhang³

et al. 2014

PIER C

Self Cite

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Abstract-A dual-band circularly polarized (CP) antenna with wide axial ratio (AR) and impedance bandwidths is proposed. Based on a rectangular ground, the antenna consists of a trapezoid patch, an L-shaped strip, a cavity, and T-shaped and L-shaped perturbations. By embedding a feeding line with a trapezoid patch and an L-shaped strip, dual-band input impedance performance and a CP performance at upper band are obtained. In order to achieve a CP performance at the lower band, a T-shaped perturbation is embedded inside the slot. Moreover, the CP performance is enhanced by inserting an Lshaped perturbation at the right bottom corner of the slot. Furthermore, using a cavity underneath the antenna, unidirectional radiation patterns with greatly gain enhancement are obtained. The measured results show that the impedance bandwidths for S 11 < −10 dB are 22.7% (2.34-2.94 GHz) and 79.8% (4.64-10.8 GHz) while the axial ratio bandwidths (AR < 3 dB) are 26.4% (2.3-3 GHz) and 12.6% (5.2-5.9 GHz) at the lower and upper bands, respectively. Additionally, the measured gain is more than 7.4 dB and 2.4 dB in the two operating bands, respectively. Thus, the antenna can be well applied for both 2.4/5.8 GHz WLAN bands and 2.5/5.5 GHz WiMAX bands.

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Wideband Circularly Polarized Antenna With Gain Improvement

Cited by 86 publications

References 10 publications

Design and simulation of a novel circularly polarized antenna with polarization reconfigurable characteristics

Design and simulation of a novel circularly polarized antenna with polarization reconfigurable characteristics

Wideband Magnetoelectric Dipole Antennas With Dual Polarization and Circular Polarization

A Dual-Broadband Circularly Polarized Antenna With Unidirectional Radiation Pattern

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