Multi-polarization Reconfigurable Antenna Design

Polarization reconfigurable antennas are usually used in applications that require polarization diversity,such as wireless communications,radar,and navigation systems.This article designs a number of multi-polarized antennas based on reconfigurable feed networks.First,two unit antennas are proposed to realize the reconstruction of circular polarization and arbitrary azimuth linear polarization;then,an array antenna is proposed,which realizes the dual-polarization and dual-beam function.By changing the excitation distribution of the array antenna,the polarization state of the dual beam can be independently adjusted.Specifically,the main content of this article includes:1.A left/right-handed dual-mode element antenna is designed,based on the principle of left/right-hand circularly polarized wave synthesis.The element antenna can achieve left-hand circular polarization(LHCP)and right-hand circular polarization in the main radiation direction(Switch arbitrarily between RHCP)and continuous angle linear polarization(LP)modes;a universal two-port feed network is designed,using voltage-controlled phase shifters and attenuators to achieve arbitrary phase and amplitude output,and the excitation unit antenna is realized Polarization state reconstruction;the simulated and measured peak gain of the antenna remains at about 6.8 d Bi at 2.45 GHz,the|S₁₁|?-10d B impedance matching bandwidth of each polarization state is 12.2%,and the impedance matching bandwidth of any polarization state coincides.For LHCP and RHCP modes,the axial ratio bandwidth of less than 3d B reaches12.7%;finally,the excitation distribution of the antenna in each polarization state is verified by the Maximum Power Transmission Theory(UMMPTE).2.An orthogonal linear polarization dual-mode element antenna is designed.Based on the principle of orthogonal linear polarization synthesis,the element antenna can achieve left-hand circular polarization(LHCP)and right-hand circular polarization(RHCP)in the main radiation direction.)And continuous angle linear polarization(LP)mode;in the same way,voltage-controlled phase shifters and attenuators are used to control the excitation phase and amplitude of the dual-mode antenna,so that the antenna can be in any polarization state.Refactoring.The|S₁₁|?-10d B impedance matching bandwidth of each polarization state is 11%,the axial ratio bandwidth of CP mode is less than 3d B is 20.4%,and the simulated and measured peak gain of the antenna remains at about 7.3 d Bi at 2.45 GHz;The excitation distribution of the antenna in each polarization state is verified by the Maximum Power Transmission Theory(UMMPTE).3.A 2×8 array antenna that can form dual-polarized beams is designed.First,the test receiving antennas working in different polarization states are placed in the far field to construct a power transmission system composed of transceiver array antennas;then,through the constraint of maximum power transmission theory(WMMPTE),the dual polarization dual beam state is obtained The excitation distribution of the transmitting array antenna.Using the principle that the polarization mode of the transmitting array corresponds to the polarization mode of the receiving antenna,the dual-polarization and dual-beam states of the four different polarization combinations of the array antenna are tested.