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
CN102394360AInactive Publication Date: 2012-03-28BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2012-03-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a low-sidelobe circular polarized microstrip array antenna applied to an electronic toll collection (ETC) system, wherein the antenna is has a three-layer structure successively including a metal foil, a dielectric substrate and a metal foil. A microstrip feed network and radiation units are arranged on the metal foil on the top of the structure; the radiation units employs a grouping mode in which n radiation units are arranged transversely and two radiation units are arranged longitudinally. There is a rotation angle difference of 90 degrees anticlockwise between each of the radiation unit above the longitudinal column and each of the radiation unit below the longitudinal column; compared with a feed phase of the radiation unit below the longitudinal column, a feed phase of the radiation unit above the longitudinal column is delayed by 90 degrees; and magnitudes of the feed currents of the radiation units at the same longitudinal column are equal. A feed joint is utilized to realize application of current excitation on a whole microstrip feed network, so that the whole microstrip feed network applies currents on all the radiation units. A simplified dolph-chebyshev distribution is utilized for current magnitude ratios that are needed by the radiation units on a same transverse line; and current phases are equal. According to the invention, the microstrip antenna has advantages of low axial ratio, low sidelobe and high gain; and moreover, the antenna is easy to process and install; therefore, the provided antenna can be widely applied to the electric toll field and other related fields.
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Description

technical field

[0001] The invention belongs to the field of non-contact toll collection systems, in particular, it is a low-side-lobe right-hand drive for a road-side unit (RSU, Road-Side Unit) in an electronic toll collection system (ETC, Electronic Toll Collection). Circularly polarized microstrip array antenna. Background technique

[0002] The electronic non-stop toll collection system uses Automatic Vehicle Identification (AVI for short) technology to complete the wireless data communication between the vehicle and the toll station, to carry out automatic vehicle identification and the exchange of relevant toll data, and to process the toll data through the computer network to realize Fully electronic toll collection system with automatic toll collection without parking.

[0003] The electronic toll collection system works mainly through the non-contact communication between the RSU and the on-board unit (OBU, On-Board Unit). When using ETC, the owner only needs to i...

Claims

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