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Microstrip antenna, electronic device, and OBU of ETC system

A technology of microstrip antenna and feeding network, applied in the direction of antenna, slot antenna, ticketing equipment, etc., can solve the problems of large internal space, radiating patch 24 area, large antenna volume, and occupying electronic equipment, etc., to meet the requirements of volume, The effect of saving internal space and reducing the area

Active Publication Date: 2013-10-23
SHENZHEN GENVICT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the path length of the current provided by the feed network flowing from one end of the radiation patch 24 to the other determines the resonant frequency of the antenna, and the resonant frequency of the antenna corresponds to its operating wavelength. The length of the flow path on 24 reaches half of the working wavelength to ensure the working frequency and performance of the antenna. In order to achieve this purpose, the side length of the radiation patch 24 of this microstrip antenna must meet a certain length, and this length leads to radiation The area of ​​the patch 24 and the overall volume of the antenna are relatively large, and it needs to occupy a large internal space of the electronic device, which is difficult to adapt to the development trend of miniaturization and precision of portable electronic devices

Method used

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  • Microstrip antenna, electronic device, and OBU of ETC system
  • Microstrip antenna, electronic device, and OBU of ETC system
  • Microstrip antenna, electronic device, and OBU of ETC system

Examples

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Effect test

Embodiment 1

[0034] Such as Figure 6 to Figure 8 As shown, the microstrip antenna in this embodiment includes a first circuit board 31 and a second circuit board 32 arranged up and down and separated, both of which are PCB boards. The radiation patch 34 is a rectangular or square patch made of conductive material, and is arranged on the top or bottom surface of the first circuit board 31. The metal surface 33 can also be a rectangle or a square. The metal surface 33 and the feed network 39 are respectively arranged on The top surface and the bottom surface of the second circuit board 32, the dielectric layer is the air layer between the first circuit board 31 and the second circuit board 32, of course other dielectric layers can also be used, the structure of the microstrip antenna using the air layer is relatively simple, Easy to process. Two coupling slots 36 corresponding to the two adjacent ends of the patch slot 35 are provided on the metal surface 33 for coupling with the radiation...

Embodiment 2

[0044] An OBU of an ETC system includes the microstrip antenna described in Embodiment 1. In this example, if Figure 6 to Figure 8 As shown, the first circuit board 31 is made of FR4 board, and the second circuit board 32 is also made of FR4 board. In the design process, adopt the design method of Embodiment 2, first determine the side length of the radiation patch 34 as , then, by adjusting the size of the patch slot 35 and the auxiliary slot 35 on the radiation patch 34, and the coupling on the metal surface The size of the slot 36 enables the microstrip antenna to work stably within the prescribed working frequency band. Specifically, in this embodiment, the auxiliary slot 351 is arranged at the end of the patch slot 35 in a straight shape, and the coupling slot 36 is just located in the vertical projection area B below the radiation patch 34 . In the feed network 39, the isolation resistor of the power divider 38 is a chip resistor. The feed network 39 divides the sign...

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Abstract

The invention discloses a microstrip antenna, an OBU of an ETC system, and an electronic device. The microstrip antenna comprises a radiation patch, a metal surface and a feed network feeding the radiation patch, wherein the radiation patch is provided with two patch slots which are vertically crossed to form a cross, and each patch slot is also provided with an auxiliary slot communicating therewith. The radiation patch provided by the invention enables the antenna to have relatively wide bandwidth and relatively high gains under the feeding effects of dual feed points of the feed network, and excellent circular polarization performance is also exhibited, at the same time, by increasing the flow paths of current on the radiation patch, the microstrip antenna may still satisfy the requirements for working frequency even when the size is reduced, and therefore, the space that the microstrip antenna occupies is saved.

Description

technical field [0001] The present invention relates to the technical field of antennas, in particular to a microstrip antenna, an electronic device, and an on-board unit (OBU: On board Unit) of an Electronic Toll Collection (ETC: Electronic Toll Collection) system. Background technique [0002] A microstrip antenna refers to an antenna that uses a microstrip line to feed a radiating patch to achieve signal reception and transmission. Because microstrip antennas have the characteristics of small size, light weight, and easy integration, they are often used in sensors and various electronic devices with signal transceiver functions. For example, it can be used in the OBU of ETC. When the vehicle equipped with OBU passes through the non-stop toll passage of the expressway, the entrance and exit of the parking lot, etc., it needs to pass the microstrip antenna and the roadside unit (RSU: Road- Side Units) to communicate, receive management signals from RSU or report vehicle in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q13/08H01Q13/10H01Q1/38G07B15/06
Inventor 殷忠良徐根华李兴锐
Owner SHENZHEN GENVICT TECH
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