Multiband antenna and communication device with multiband antenna

Abstract

The invention relates to a multiband antenna and a communication device with the multiband antenna. The multiband antenna is used for a communication device and comprises a medium substrate, a grounding part and a radiation metal part. The medium substrate comprises two surfaces. The grounding part comprises a first grounding surface, a second grounding surface and a connecting metal wire; the first grounding surface of the grounding part is positioned on one surface of the medium substrate and has a first connecting point and a short circuit point; the second grounding surface is close to the first grounding surface and has a second connecting point; one end of the connecting metal wire is connected with the first connecting point and the other end is connected with the second connecting point; and at least one part of the connecting metal wire is positioned on one surface of the medium substrate. The radiation metal part is positioned on one surface of the medium substrate and is not overlapped with the first grounding surface; and the radiation metal part comprises a radiation section and a feed-in section, wherein one end of the radiation section is connected to the short circuit point, and the other end is an open end; one end of the feed-in section is connected to a signal source, the other end is an open end, and the distance between the open end and the radiation section is less than 3mm.

Description

technical field [0001] The invention relates to an antenna and a communication device, in particular to a small-sized multi-frequency antenna suitable for a foldable communication device, and a foldable communication device with a multi-frequency antenna. Background technique [0002] With the vigorous development of wireless communication, various wireless communication technologies and products continue to progress and appear. Among them, the miniaturization of the antenna of portable communication devices has always been a very important research topic. For most portable communication devices, multi-frequency operation is a basic requirement. However, regardless of the form of the portable communication device, at present, the multi-frequency operation is mainly achieved by exciting the resonant mode of the antenna itself. However, in order to cover the operation of the low frequency band, it is often necessary to increase the area occupied by the antenna. [0003] In th...

AI Technical Summary

Problems solved by technology

However, to cover low frequency band operation, the area occupied by the antenna often has to be increased

[0003] In the prior art, China Taiwan Patent Publication No. I 258,891 "Mobile Mobile Phone Antenna" and China Taiwan Patent Publication No. I 262,620 "A Built-in Mobile Mobile Phone Antenna" are both antenna designs applied to foldable mobile phones , which uses the quarter-wavelength resonant mode of the inverted F-shaped antenna to cover the desired frequency band, so if you want to cover the low frequency band in this way, it is necessary to increase the length of the antenna, forcing the antenna to increase the area

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