低剖面宽带圆极化天线阵列

基于双馈双线极化微带天线，结合威尔金森功分器、T形结功分器及顺序旋转馈电的优点，设计了一种新型低剖面宽带圆极化2×2天线阵列。把辐射贴片和馈电网络集成在同一介质层，有效地利用了介质空间，降低了天线的剖面，增加了天线的带宽。4个天线单元顺序旋转90°，利用一分四T形结功分器给4个单元等幅、相位依次相差90°馈电。根据Ansoft''s HFSS仿真结果，制作了样机。样机实测结果和仿真结果吻合。实测结果表明，该天线阵驻波带宽可以达到27.78%，3-dB轴比带宽可以达到52%，最大增益为14.19 dB。

Low-profile broadband circularly polarized antenna array

Combining the advantages of Wilkinson power divider, T-junction power splitter and sequential-rotation feed method, a novel low-profile broadband circularly polarized 2×2 antenna array is designed based on the dual-fed dual-polarized microstrip antenna. Radiation patch and feed network are integrated on the same substrate to improve the usage efficiency of the substrate, thus low-profile and broadband are obtained. Four elements are rotated 90° in turn. One-to-four T-junction power splitter provides the elements with balanced signals of equal magnitude and an incremental 90° phase. An antenna prototype is fabricated after simulation in Ansoft''s HFSS. Good agreement is found between measurement and simulation. Experimental results show that the array has a 2-VSWR bandwidth of 27.78%, and a 3-dB axial ratio bandwidth of 52%. The maximum gain is 14.19 dB.