Frequency modulation antenna and realization method and mobile terminal thereof

Abstract

The invention discloses a frequency modulation antenna, which comprises a keyboard, a connector, a frequency modulation (FM) antenna matching network and an FM receiving chip, wherein the metal support of the keyboard is used as an FM antenna to receive FM frequency band signals; the connector is used to connect the metal support of the keyboard with the feed end of the FM antenna matching network; the FM antenna matching network is connected with the connector through the feed end and is used to adjust the impedance of the metal support in the keyboard to enable the metal support to reach the resonance of the FM frequency band; and the FM receiving chip is used to receive the FM frequency band signals transmitted by the metal support in the keyboard and the FM antenna matching network. The invention additionally discloses a realization method and a mobile terminal for the frequency modulation antenna. By adopting the technical scheme, the invention has the advantages that one FM antenna is saved for the mobile terminal, the cost and the internal space of the mobile terminal are saved, and the loudspeaker function of the frequency modulation radio set is realized.

Description

technical field [0001] The present invention relates to frequency modulation antenna technology, in particular to a frequency modulation antenna device, its realization method and a mobile terminal. Background technique [0002] In the prior art, since the internal space of the mobile terminal is very small, the space left for FM antenna wiring can hardly reach the resonance of the FM frequency band. Therefore, the design of the FM antenna becomes a big problem. Moreover, with the popularization of the FM radio playback function in the entire mobile terminal industry, how to receive FM frequency bands without using earphones in mobile terminals has become a problem that major manufacturers are currently considering. [0003] The FM antenna in the mobile terminal described in the utility model patent whose application number is CN200420034296 is a loop antenna composed of a copper layer on at least one printed circuit board (PCB), which takes up space on the PCB; The FM ante...

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Problems solved by technology

[0003] The FM antenna in the mobile terminal described in the utility model patent whose application number is CN200420034296 is a loop antenna composed of a copper layer on at least one printed circuit board (PCB), which takes up space on the PCB; The FM antenna described in the utility model patent CN200720199278.1 is an assembly fixed under the main board of the mobile terminal, which is set up separately and will occupy the internal space of the mobile terminal to a certain extent, which is not conducive to miniaturization; application number CN200820156635. The FM antenna described in the utility model patent of 0 is an antenna realization method combining a shield frame and a ceramic antenna. In addition to occupying space, it also increases the cost of the mobile terminal, which is not conducive to the production of the manufacturer.

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