Design of a Broadband Dual Circular Polarization Microstrip Antenna Array
To support the requirements of broadband data transmission from low orbit satellites,a wide band dual circular polari-zation microstrip antenna is proposed.The microstrip antenna is taken as the basic radiation unit,the antenna bandwidth based on the stacked parasitic patch and loaded air cavity methods is widened,and the gain value of the antenna is improved.The antenna unit is fed by using a capacitor loaded three-way branch directional coupler to further widen the antenna bandwidth and achieve the character-istics of the dual circularly polarized radiation.The simulation results of unit electrical performance are good,with an impedance rela-tive bandwidth of 28.2％,an axial relative bandwidth of 14.5％,and a peak gain of 5.6 dBi.Based on radiation units,a 4×4 array combination is designed,with an impedance bandwidth covering 7.7～8.9 GHz.The isolation degree between different polarizations and ports of the same unit is not less than 15 dB,with a axial ratio of not greater than 3 dB within the pass band.The simulation re-sults of the directional pattern are in good agreement with the testing results,the designed scheme is verified.
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