Circularly-Polarized Shaped Pattern Planar Antenna for Aerial Platforms

Hamza Nawaz,Muhammad Shahzad Sadiq,Xianling Liang,Ronghong Jin,Junping Geng

doi:10.1109/access.2020.2964008

Hamza Nawaz, Muhammad Shahzad Sadiq + Show 3 more

Open Access

https://doi.org/10.1109/access.2020.2964008

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Abstract

Circularly-polarized planar antenna with a shaped pattern for airborne applications, is proposed in this letter. The proposed antenna consists of vertically-polarized formation and horizontally-polarized stubs to provide circularly-polarized configuration, which is loaded by a copper curl based top layer to control current distribution for beam shaping and filling of zenith null. The antenna also contains split ring resonators beside partial ground to make it deployable over larger ground planes (metallic bodies) without distorting circular polarization by controlling phase of reflected waves. The power density of presented airborne shaped pattern antenna differs for variant elevation and azimuth angles, to have uniform wireless coverage over the earth's surface by managing variations of the signal strength because of different path lengths. The demonstrated antenna also possesses circular polarization and direction based circular polarization diversity at angles against the greatest path-lengths. Antenna retains a null-filled pattern in the vertical plane along with having high absolute peak gain (5.5 ± 1 dBi) and adequate peak polarization gain (2 to 4 dBi) through-out the operational bandwidth from 2.82 GHz to 2.89 GHz (Measured reflection coefficient less than -10 dB). Moreover, the radiating element exhibits omnidirectional radiation characteristics, with good horizontal gain (greater than -3.6 dBi).

Highlights

Antennas are always regarded as an essential part of wireless systems, whereas their radiation and polarization characteristics play a vital role in defining the performance and efficiency of such systems [1], [2]
The designed configuration presented in this paper proposed the use of split-ring resonators to avoid circular polarization distortion and provide mounting compatibility with metallic vehicular structures
A circularly-polarized, pattern shaped antenna is proposed in this letter

Summary

INTRODUCTION

Antennas are always regarded as an essential part of wireless systems, whereas their radiation and polarization characteristics play a vital role in defining the performance and efficiency of such systems [1], [2]. Apart from targeting the benefit of covering more illumination range, the proposed antenna provides direction based polarization diversity Such antennas can be worthy of modern aerial platforms for data sectoring and secure communication, apart from grabbing other benefits of polarization diversity. Another issue catered during the design is the compatibility of circularly. The designed configuration presented in this paper proposed the use of split-ring resonators to avoid circular polarization distortion and provide mounting compatibility with metallic vehicular structures. A planar, conformal antenna having an omnidirectional azimuth pattern, stable horizontal gain, and null-filled radiation characteristics in the elevation plane is proposed, which fulfills beam shape requirements of airborne applications.

ANTENNA DESIGN AND GEOMETRY

CONCLUSION