Low-sidelobe circular polarized microstrip array antenna applied to electronic toll collection system
An electronic non-parking and charging system technology, applied in the field of low-side lobe right-handed circularly polarized microstrip array antennas, can solve the problem of simultaneous antenna satisfaction, achieve high gain, low axial ratio, and reduce side lobe levels
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[0029] The invention is a low-side lobe circularly polarized microstrip array antenna for an electronic non-stop charging system, such as figure 1 , figure 2 As shown, it includes a microstrip antenna board 1 and a feed connector 2 . The microstrip antenna board 1 is composed of two layers of metal foil 101 and a layer of dielectric substrate 102, such as image 3 As shown, a dielectric substrate 102 is arranged between two layers of metal foils 101, and the three are fixed to each other. The dielectric substrate 102 is polytetrafluoroethylene glass cloth. Compared with ceramic plates and epoxy plates, polytetrafluoroethylene glass cloth has a smaller dielectric constant (2.1-3.5) and a smaller loss angle (tanδ≤3× 10 -3 ), moderate hardness and less loss. In order to reduce the loss as much as possible and improve the antenna gain, the dielectric constant of the dielectric substrate 102 selected by the present invention is 2.65, and the loss angle tanδ≤7×10 -4 , a thickn...
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