Reconfigurable dual-slit perturbed patch antenna for circular polarization diversity

et al. 2022

A novel dual-band circularly-polarized frequency reconfigurable microstrip antenna with the feasibility of obtaining a relatively smaller size is proposed and demonstrated. Fed by a Wilkinson power divider with 90° phase difference, the proposed circularly-polarized frequency reconfigurable patch antenna, consisting of a patch radiator etched with a square-ring slot and a double-sided printed DC bias circuit, is designed, analyzed and fabricated. Good agreement between simulated and measured results is observed. Simulation and measurement results reveal that the proposed dual-band circularly polarized (CP) antenna for BeiDou navigation satellite system can provide impedance bandwidths of 4.1% (1.592-1.658 GHz) and 5.5% (2.43-2.568 GHz) for lower L band and upper S band respectively, as well as 3-dB axial ratio (AR) bandwidths of 1.5% (1.602-1.626 GHz) and 1.7% (2.465-2.507 GHz) for LHCP and RHCP respectively. Meanwhile, within the effective LHCP/RHCP bandwidths, the proposed antenna has gains from 3.6 dBic to 4.2 dBic with an average gain of 4.0 dBic for LHCP, and gains from 3.3 dBic to 3.6 dBic with an average gain of 3.4 dBic for RHCP, respectively.

Section: Introductionmentioning

confidence: 99%

Compact dual-band circularly-polarized frequency reconfigurable microstrip antenna for BeiDou navigation satellite system application

Liang¹,

He²,

et al. 2022

“…Many electrical reconfigurable antennas use p-i-n diode [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19] or MEMS [20,21] as RF switches, which can be switched faster and more convenient than mechanical reconfigurable antennas [22,23,24,25,26,27,28]. In some designs, switches are integrated into the antenna, chang-ing the surface current distribution on the antenna by switching on and off to achieve different polarizations [5,6,7,8,9,10,11,12,13,14,15,16,20,21]. As an alternative design, switches can also be integrated into the feeding network of antennas.…”

Section: Introductionmentioning

confidence: 99%

A compact reconfigurable feeding network for 5G quadri-polarization antennas

Huang

Sun

et al. 2022

This letter presents a compact reconfigurable feeding network, which can provide four polarizations. The feeding network includes a branch-line hybrid, two p-i-n diodes, and two grounded capacitors. By manipulating the on/off states of the two diodes, the capacitor can be selectively integrated into the hybrid circuit. Hence, the power distribution of the output ports is changed. The feeding network operating in state I provides a pair of orthogonal linear polarizations (LPs) when both diodes are turned off. The feeding network operating in state II provides a pair of orthogonal circular polarizations (CPs) when both diodes are turned on. Experimental results show that the proposed feeding network has a wide operating bandwidth from 3400 to 3800 MHz with S 11 ≤ −20 dB and isolation level > 20 dB in two states. Moreover, the amplitude imbalance of the output ports is less than 1.3 dB with a 90 • stable phase difference when the feeding network operates in state II. The presented reconfigurable feeding network is suitable for fifth-generation (5G) quadri-polarization antennas.

“…Circularly polarized (CP) antennas have been increasingly popular in various wireless communication systems, including satellite, radar, wireless local area networks, and radio frequency identification systems due to their outstanding advantages of mitigating polarization mismatch and suppressing multipath interference [1,2,3]. With the recent trend in high-speed data transmission in wireless technology, the demand for CP antennas with wideband operation is also high.…”

Section: Introductionmentioning

confidence: 99%

A low-profile and wideband crossed dipole antenna based on AMC reflector for circularly polarized applications

Sun

2018

Based on the AMC (Artificial Magnetic Conductor) reflector, a low-profile and wideband crossed dipole antenna for circularly polarized (CP) applications is presented in this paper. The antenna consists of a doublesided printed crossed dipole radiator, four parasitic loops and an AMC reflector. The crossed-dipole radiator is fed by a pair of vacant-quarter printed rings, generating circularly polarized radiation. By using the parasitic loops, an additional CP mode is produced, which combines with the original CP resonance to provide wideband CP operation. Also, an AMC reflector is used here to obtain unidirectional radiation pattern and the low-profile property. To verify the feasibility of the proposed design, a prototype has been fabricated and measured. The results show good performance of 10-dB impendence bandwidth is approximately 50.0% (1.29-2.15 GHz), and 3-dB axial ratio bandwidth of 27.7% (1.4-1.85 GHz). Moreover, the prototype has a low profile of 0.11λ 0 (in terms of the center frequency of passband) and an average gain of approximately 8.9 dBic within passband.