Low-sidelobe lens array antenna for ETC system

A lens array, low side lobe technology, applied to antenna arrays, antennas, slot antennas and other directions that are powered on separately, can solve the problems of car following interference, reduced efficiency, active standing waves, etc., to avoid amplitude and phase errors and improve production. Efficiency, the effect of simplifying installation costs
CN110635233AInactive Publication Date: 2019-12-31XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2019-12-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of antennas, and discloses a low-sidelobe lens array antenna for an ETC system. The antenna is characterized in that 8*18 microstrip loading patches are printed on a first dielectric substrate; and the upper surface of a second dielectric substrate is selectively electroplated with a microstrip line coupled feeding 8*18 slot antenna array. The microstrip line coupled feeding 8*18 slot antenna array comprises 8*18 microstrip slot antennas and 18 groups of one-to-eight unequal T-shaped power division networks; and the slot microstrip antennas generatenew resonance points by loading the microstrip patches above slots, so that the working bandwidth is broadened. A Rotman lens network is provided with seven wave beam ports and eighteen array ports;and by combining a wave beam outline, a receiving outline, phase shift microstrip lines and pi-type attenuators, signal output of equal-amplitude linear phase difference and Taylor amplitude distribution is achieved and the low-sidelobe characteristic of the pitching surface of the array antenna is obtained. The problems that a traditional ETC antenna is complex in feeding structure and large in directional diagram sidelobe interference are solved.
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Description

Technical field

[0001] The present invention belongs to the field of antenna technology, and particularly relates to a low sidelobe lens array antenna used in an ETC system. Background technique

[0002] At present, in highways or busy bridges, tunnels and other toll places, the ETC system can allow vehicles to pass without stopping under unattended conditions, which can improve vehicle traffic efficiency, thereby improving highway traffic capacity and reducing toll management costs . Existing ETC antennas mainly use linear phased arrays to realize beam scanning on the elevation plane, and perform regional communication and identification and positioning of ETC vehicles. The communication area of ​​the ETC phased array antenna is scanned in the front and rear directions of the lane, that is, the beam is required to be scanned in the elevation direction, and the beam is fixed when the horizontal direction is possible. The current problem is that the phased array will form gratin...

Claims

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