Vehicle-mounted 4G knife type antenna

Abstract

The invention discloses a vehicle-mounted 4G knife type antenna comprising a dielectric substrate, an antenna radiating unit printed on the front side of the dielectric substrate, and a metal floor. The antenna radiating unit consists of a low-frequency radiated branch segment, a high-frequency radiated branch segment, and a short-circuit branch segment connected between the antenna radiating unit and the metal floor. A microstrip feeder line for feeding power for the antenna is arranged at the edge of the antenna radiating unit; and a parasitic coupling patch is arranged on the back of the dielectric substrate. The antenna has the following advantages: the requirement on the shark fin outer case dimension is met; the 4G frequency band bandwidth is covered; the standing wave characteristic in the frequency band is good; and the antenna is suitable for automotive 4G communication.

Description

technical field [0001] The present invention relates to the technical field of antennas, and more specifically relates to a wireless communication antenna used on a mobile terminal. Background technique [0002] With the continuous development of modern automobiles in the direction of electronics, people's requirements for automobiles are no longer limited to being used as a means of transportation. Based on the development of my country's Internet of Vehicles technology, the Internet of Vehicles products with rich functions are continuously launched. People are eager to enjoy more intelligent functions such as GPS positioning, online fault diagnosis, vehicle status detection, abnormal alarm, location service, driving data statistics, and management scheduling. The rapid development of 4G communication technology provides high-speed network services for people's needs. As a device for transmitting and receiving wireless signals, the antenna also puts forward higher requireme...

AI Technical Summary

Problems solved by technology

The defect of this kind of antenna unit is: the national standard has a clear height requirement for the protrusions outside the vehicle, the height of the shark fin cover cannot be greater than 70mm, so the height of the mobile communication antenna integrated in the shark fin shell needs to be lower, so that the It is difficult for existing antennas to meet the above requirements; for 4G antennas, it is difficult to realize a small-sized antenna that covers 4G frequency bands and can be used for both transmission and reception, mainly due to the metal casing of the car. It has a great impact on the performance of the antenna, and at the same time, the low-frequency bandwidth is difficult to cover enough wide-band index requirements is also one of the difficulties in design

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