A Stacked Patch Antenna With Broadband Circular Polarization and Flat Gains

Kang Ding,Kun-Hua Wen,Yanjie Wu,Duo-Long Wu,Jian-Feng Li

doi:10.1109/access.2021.3059948

Kang Ding, Kun-Hua Wen + Show 3 more

Open Access

https://doi.org/10.1109/access.2021.3059948

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Abstract

In this paper, a stacked circular polarization (CP) patch antenna with broad impedance bandwidth, axial-ratio (AR) bandwidth, and flat gains is investigated. The antenna is composed of a square ring, double layers’ stacked patches, and four vertical patches. The corner truncated loop served as a sequential phase feeding structure for four driven patches. To improve the impedance matching, four square patches are stacked on the bottom layer. Furthermore, four vertical patches are introduced on the ground plane to broaden the AR bandwidth. Simulated and measured studies are conducted on an antenna prototype to validate the proposed design. The proposed design shows that the measured impedance bandwidth is 4.65–7.21 GHz (43.2%), measured 3-dB AR bandwidth at broadside is 4.9–6.4 GHz (26.5%) and the 1-dB gain bandwidth is 4.75–6.6 GHz (32.6%). Compared with other similar CP stacked patch antennas, the antenna owns advantages of wide bandwidth, compact size, and flat gain.

Highlights

Due to the advantages of suppressing multipath interferences and reducing polarization mismatch, some wireless communication systems require the antenna to have wideband and circular polarization (CP) characteristics [1], [2]
To obtain wide 3-dB AR bandwidth and flat gain, a stacked patch antenna with coupled vertical patches is developed in this paper
It is worth mentioning that the AR bandwidth of Ant.4 is not the optimal result since the dimensions are directly copied from the optimized wideband design that has vertical patches

Summary

Introduction

Due to the advantages of suppressing multipath interferences and reducing polarization mismatch, some wireless communication systems require the antenna to have wideband and CP characteristics [1], [2]. K. Ding et al.: Stacked Patch Antenna With Broadband CP and Flat Gains proposed in [26] to achieve broadband impedance matching and wideband CP characteristics. To obtain wide 3-dB AR bandwidth and flat gain, a stacked patch antenna with coupled vertical patches is developed in this paper. The square loop is initially proposed to obtain the original CP mode, the double layers’ stacked structure is employed to improve the impedance matching and to generate extra CP mode.

Results

Conclusion