An antenna

Abstract

The invention relates to an antenna, which comprises a reference ground, a first radiation branch and a second radiation branch, wherein the reference ground includes a first grounding point and a second grounding point; the first radiation branch is connected with the reference ground through the first grounding point; the second radiation branch is connected with the reference ground through the second grounding point; a slit is formed between the first radiation branch and the second radiation branch, and the first radiation branch and the second radiation branch are coupled with each other through the slit to form a distributed capacitance for signal coupling; and the connection point between one end of the second radiation branch for signal coupling and an RF feed line services as a feed point, which is located between the first grounding point and the second grounding point. The antenna has the advantages that a coplanar waveguide coupling structure between the resonant branches of the antenna is equivalent to capacitor loading, and the field loaded by the distributed capacitance is mainly centralized in the air, so that power loss caused by internal resistance of the device loaded with a lumped parameter capacitor is obviated, thereby lowering the resonant frequency of the antenna and reducing the antenna size.

Description

technical field [0001] The invention relates to the antenna technology of a communication terminal, in particular to an antenna. Background technique [0002] Using a multi-antenna system on a notebook requires installing multiple antenna units at the same time, but the space where the antenna units can be installed is limited, and the distance between the antenna units must be kept sufficient to reduce coupling, so the space that each antenna unit can occupy must not be limited. Do not shrink. Generally, the notebook antennas are installed on the edge of the machine in a long strip shape. Generally, the size of the antenna unit is required to be about a quarter of the wavelength. In this way, in the 900MHz GSM frequency band, the antenna unit should be about 80-90mm. The distance between the antenna units should be greater than one-third of the wavelength, that is, 110mm, and about 270mm is required to install two antenna units. And considering that other frequency bands...

AI Technical Summary

Problems solved by technology

[0004] Using capacitance or inductance as loading can reduce the size of the antenna, but the device loss is relatively large at mobile communication frequencies (above 800MHz), resulting in a lower actual gain of the antenna; folding the vibrator can reduce the electrical size, but using a folding vibrator on the edge of the notebook The vibrator, because the radiator is very close to the metal frame of the notebook, the radiation space is very limited, the radiation impedance is very low, it is not easy to match the impedance, and the antenna bandwidth is narrow; although slotting and slits can reduce the electrical size of the antenna, the antenna needs to be installed on the notebook At the edge of the screen, there is often not enough space for slots and slits

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