Simple Reconfigurable Circularly Polarized Antenna at Three Bands.

Tu Le,Han-Young Park,Tae-Yeoul Yun

doi:10.3390/s19102316

Abstract

In this paper, a simple design for a triple-band circularly polarized (CP) antenna with the capability of switching its polarization between dual-sense CPs is presented. The proposed antenna is comprised of a monopole loop antenna as a primary radiator. By placing a parasitic loop around the primary radiator, an additional CP band is achieved. Reconfigurability of the polarization between right-hand CP (RHCP) and left-hand CP (LHCP) at three different frequencies of 2.5, 3.3, and 3.8 GHz was realized by controlling the ON/OFF states of two PIN diodes. For validation, the fabricated antenna yielded an impedance bandwidth of 52.6% (2.34–4.01 GHz), while the axial ratio bandwidths for both the RHCP and LHCP states were 3.5% (2.47–2.56 GHz), 6.6% (3.20–3.42 GHz), and 2.4% (3.74–3.83 GHz). The measured broadside gains within the axial ratio bandwidth were 1.2, 2.7, and 1.4 dBi, respectively. Compared to other reconfigurable multi-band CP antennas, the proposed design is the first work to achieve a reconfigurable polarization at three distinct bands at a low fabrication cost by using only two diodes. The proposed antenna is suitable for WLAN and WiMAX applications.

Highlights

Polarized antennas with outstanding features exhibit many advantages over linearly polarized (LP) antennas, including the ability to mitigate polarization mismatch and establish stable communication between the transmitter and receiver sides
Compared to other reconfigurable multi-band circularly polarized (CP) antennas, the proposed design is the first work to achieve a reconfigurable polarization at three distinct bands at a low fabrication cost by using only two diodes
CP (LHCP) states have increasingly been used in wireless communication systems

Summary

Introduction

Polarized antennas with outstanding features exhibit many advantages over linearly polarized (LP) antennas, including the ability to mitigate polarization mismatch and establish stable communication between the transmitter and receiver sides. CP (LHCP) states have increasingly been used in wireless communication systems This antenna type is desirable for single antennas that can operate with multiple wireless applications. To achieve these needs, the first solution is to design antennas with reconfigurable polarization and wideband characteristics [1,2,3,4,5,6,7,8]. Other antennas with simple feeding methods were explored in [3,4,5,6,7,8] These could consist of an electric dipole [3] or the combination of an electric dipole and a magnetic dipole [4,5].

Methods

Results

Conclusion