Device and method for using radio frequency antenna as FM (Frequency Modulation) modulating antenna

Abstract

The invention discloses a device and a method for using a radio frequency antenna as an FM (Frequency Modulation) modulating antenna. The device comprises the radio frequency antenna, a matching isolating circuit, a low-noise amplifying circuit and an FM modulation-demodulation chip, wherein the radio frequency antenna is used for receiving an FM modulating signal and a radio frequency signal used for normal communication; the matching isolating circuit is connected to the radio frequency antenna and is used for isolating the radio frequency signal, matching the FM modulating signal and outputting the FM modulating signal within a preset frequency band; the low-noise amplifying circuit is connected to the matching isolating circuit and is used for amplifying the received FM modulating signal; and the FM modulation-demodulation chip is connected to the low-noise amplifying circuit and is used for demodulating the received FM modulating signal and outputting an analog audio frequency signal. In the device, the radio frequency antenna is used as the FM antenna, the matching isolating circuit is used for efficiently separating two paths of signals, the quality of the FM signal is excellent, the anti-jamming capability is excellent, the earphone playing is supported and the external loudspeaker playing is also supported. The problem of structural assembling is avoided, the cost is low, the device is easily designed and realized, and the device is suitable for all the wireless terminal products supporting an FM function.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a device and method for using radio frequency antennas as FM modulation antennas. Background technique [0002] At present, FM (Frequency Modulation, frequency modulation) is very popular in consumer electronics and wireless communication terminal products, and has become a standard function of wireless communication terminal products. At present, the methods used to implement FM antennas in the industry are mainly divided into two categories: the first type is external antennas, such as earphone cables are commonly used to receive FM signals; the second type is built-in FM antennas, including ceramic antennas, FPC ( Flexible and Rigid-Flex, flexible circuit board) antenna, PCB (Printed Circuit Board, printed circuit board) copper foil antenna, etc. [0003] In the prior art, using the charging interface and / or data interface cable to realize the FM antenna of the...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a device and method that uses the radio frequency antenna as the FM modulation antenna, so as to solve the problem of using an external FM antenna in the prior art, which has a high cost and cannot be placed outside when it is not carried and uses a built-in FM antenna. The problem of poor antenna effect

Images