Inverted-F antenna with double-branch, short-circuit structure

Abstract

This invention relates to a kind of inverse F type antenna with double braches short circuit structure. The antenna concludes: a main radiating metal sheet, a accessory radiating metal sheet, a ground connected face, a dielectric base, a double branches short circuit metal sheet and a feeding metal sheet. The main radiating metal sheet concludes a first sub-radiating metal sheet, a secondary sub-radiating metal sheet, a feeding point and a first short circuit point. The first sub-radiating metal sheet forms a long electric current path, which generates first (low-frequency) operation mode of the antenna. The secondary sub-radiating metal sheet forms a short electric current path, which generates second (high-frequency) operation mode of the antenna. The accessory radiating metal sheet is used for increasing the operating frequency band of second (high-frequency) operation mode of the antenna. The accessory radiating metal sheet concludes a secondary short circuit point. One end of thedouble branches short circuit metal sheet connects to the ground connected face, the other end has a double branches structure which connects to the first short circuit point of main radiating sheet and the secondary short circuit point of accessory radiating metal sheet respectively. One end connects to the feeding point of main radiating metal sheet, the other end to system signal source so as to transferring signal. This invention has multi-frequency ability. Its frequency band is defined that it can reach 90MHz and 300MHz respectively at low-frequency and high-frequency range. It can easily cover GSM 900 / 1800 and DCS three-frequency frequency band of mobile communication.

Description

technical field [0001] The invention relates to an inverted-F antenna (inverted-F antenna), especially an antenna applied to wireless communication products. Background technique [0002] With the rapid development of wireless communication in recent years, the performance requirements of antennas have also gradually increased. In addition to the reduction in size, the antenna characteristics must also have the characteristics of multi-band or large bandwidth in order to meet market demand. In terms of appearance and practical convenience, it is gradually moving towards the miniaturized built-in antenna design. In order to achieve the reduction in size and maintain the characteristics of multi-band or wide-band antenna characteristics, the built-in antenna is usually made The design tends to be complicated. Therefore, how to use effective antenna parameters to meet the specifications required by the product in a limited environment and space has become an important guidelin...

AI Technical Summary

Problems solved by technology

[0003] The built-in antennas currently used in mobile communication devices such as mobile phones, personal digital assistants (PDAs) and other products usually adopt an inverted-F antenna design, and the conventional inverted-F antenna design is such as US Patent No. 6,727,854 "inverted-F" Panel Antenna"( figure 1 ), which discloses a built-in antenna applied to mobile phones. The antenna mainly radiates the metal sheet part, which can be roughly divided into three current paths 10, 13, and 14 starting from the feed-in point 15 and the short-circuit point 16. The path excites different resonant frequencies to synthesize dual-frequency operation that meets the requirements of the GSM / DCS frequency band; this type of inverted-F antenna design usually only has a short-circuited metal sheet with a single branch, and its structure is relatively complex, and the current path is more winding , resulting in a narrow bandwidth that can only achieve dual-band operation, and it is difficult to adjust the characteristics of the antenna in practical applications

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