Impedance matching circuit of antenna and terminal

Abstract

The invention relates to the technical field of communication, and discloses an impedance matching circuit of an antenna and a terminal. In the invention, the impedance matching circuit of the antenna comprises an antenna matching network and an inductive coupler, wherein the antenna matching network and the inductive coupler are serially connected between a radio-frequency circuit and the antenna; the impedance of the antenna is R+jX, R is a resistance value, X is a reactive component, and j is an imaginary part unit; the impedance of the antenna matching network is _jX, the resistance value of the antenna matching network is zero, and the reactive component is equal to X; and the sum of the resistance value of the inductive coupler and the resistance value of the antenna is equal to the resistance value of the radio-frequency circuit. The embodiment of the invention further provides the terminal. Compared with the prior art, the embodiment of the invention can reduce the matching difficulty of the antenna and the radio-frequency circuit, the promotion of antenna performance is facilitated, and the implementation is simple.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an antenna impedance matching circuit and a terminal. Background technique [0002] In a mobile terminal, an antenna needs to be used to receive and transmit signals, and in the process of receiving signals by the antenna, whether the impedance matching between the antenna and the radio frequency circuit will directly affect the performance of the antenna for transmitting and receiving signals. [0003] In the process of realizing the present invention, the inventor found that there are the following problems: the current mobile phone antenna covers more and more frequency bands, due to the large difference in characteristic impedance between the high and low frequency bands of the antenna, and the traditional antenna matching network consists of a fixed value of inductance and The capacitor composition of a fixed value, either in the high frequency band of the antenna make...

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Problems solved by technology

[0003] In the process of realizing the present invention, the inventor found that there are the following problems: the current mobile phone antenna covers more and more frequency bands, due to the large difference in characteristic impedance between the high and low frequency bands of the antenna, and the traditional antenna matching network consists of a fixed value of inductance and The fixed-value capacitor composition, either in the high-frequency band of the antenna makes the antenna and the RF circuit better matched, or in the low-frequency band of the antenna makes the antenna and the RF circuit better matched, it is difficult to take into account all frequency bands at the same time

[0004] Moreover, the traditional antenna matching network needs to eliminate the reactance part of the antenna, and the sum of its own resistance value and the resistance value of the antenna must be close to the resistance value of the radio frequency circuit, which makes debugging difficult and the performance of the antenna is not ideal.

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