Abstract
A novel circular polarization (CP) reconfigurable microstrip antenna is presented. The CP reconfigurable antenna is divided into three layers, composed of an annular radiating patch, ring slot, and reconfigurable orthogonal network (RON). The designed antenna is fed by dual vertical branches at the output port of the RON. By adjusting the bias voltage of the PIN switch loaded on the reconfigurable orthogonal network, the output phase can be changed, which means that the polarization direction of CP antenna is switchable. Simulation results show that the proposed feeding network provides constant phase difference and lower insertion loss for both states in the operating frequency band, thereby achieving good match and axial ratio characteristics either LHCP or RHCP state. Measured results show that the proposed antenna exhibits operational bandwidth of 1.2% with axial ratio below 3 dB and return loss above 10 dB in both polarized states. Good agreement between simulated and measured results is obtained.
Highlights
Satellite communication systems play an increasingly important role in the modern communication system
LHCP/ RHCP reconfigurable antenna is useful in T/R sharing design for the satellite communication system. e polarization direction of the antenna can be mechanically reconfigured between LHCP and RHCP by rotating the MS in [10]
In [13], an E-shaped patch antenna with dual RF switches was loaded on the radiation patch gap and surface current distribution was reversed by adjusting opposite state of the switches, which brings about different circular polarization modes
Summary
Satellite communication systems play an increasingly important role in the modern communication system. LHCP/ RHCP reconfigurable antenna is useful in T/R sharing design for the satellite communication system. In [13], an E-shaped patch antenna with dual RF switches was loaded on the radiation patch gap and surface current distribution was reversed by adjusting opposite state of the switches, which brings about different circular polarization modes. Eight diodes were used for loading on the feeding network for LP/LHCP/RHCP reconfigurability in [17] and 13.1% impedance bandwidth was obtained for both linear polarization and circular polarization. E antenna fed though coupling between ring slot on the ground plane and dual vertical feeding branches connected to the reconfigurable orthogonal network. By adjusting the state of the PIN diodes loaded at input port of the hybrid, the proposed antenna can be switched electronically between LHCP/RHCP. By adjusting the state of the PIN diodes loaded at input port of the hybrid, the proposed antenna can be switched electronically between LHCP/RHCP. is feeding network can be used in dual-feed circular polarization antenna to achieve CP reconfigurable
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