Design of double band Beidou navigation antenna with wide axial ratio beam
[Objectives]In order to effectively broaden the beam width of the 3 dB axis ratio of a Beidou an-tenna,this paper proposes a slotted laminated microstrip patch antenna loaded with parasitic elements.[Methods]The Beidou dual frequency band feature is realized through a two-layer substrate structure.The bandwidth is widened by slotting.Circular polarized radiation is achieved by cutting corners at the edge of the patch.At the same time,L-shaped parasitic elements are loaded around the patch to broaden the 3 dB axial ra-tio beam width of the antenna.[Results]The measured and simulated results are in good agreement.The rel-ative bandwidths of the antenna in the Beidou B1 and B2 bands are 3%and 7.5%.The beam width of the 3 dB axis ratio can reach 180° and 176°,and the maximum gain can reach 6 dBi.In the Beidou receiver test,the number of antenna satellites can reach more than 17,and the positioning accuracy is within meters.[Conclusions]This paper proposes and validates a high-precision positioning dual band Beidou navigation antenna with wide axis ratio beam width.The results can provide references for the design of small Beidou navigation antennas.
beidou navigation antennadual bandaxial ratio beam widthparasitic unitmulti-store
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