Antenna impedance matching device and method

Abstract

The invention discloses an antenna impedance matching device and method. The device comprises an application detection module, a self-adaptive control module and a matching and adjusting module, wherein the application detection module is used for detecting the current state of a terminal antenna and outputting a matching adjustment signal according to the state; the self-adaptive control module is used for responding the matching adjustment signal and controlling the matching adjustment process; and the matching and adjusting module is used for matching and adjusting the antenna impedance by an impedance matching network corresponding to the matching adjustment signal under the control of the self-adaptive control module. By adopting the technical scheme, the invention solves the problem of single impedance matching mode in the prior art, thus further achieving the effect of differentiation matching aiming at multiple application states of a terminal.

Description

technical field [0001] The present invention relates to the communication field, in particular to an antenna impedance matching device and method. Background technique [0002] The performance of the antenna directly determines the strength of the transmitted signal. When debugging the antenna, impedance matching and VSWR (Voltage Standing Wave Ratio) have a great influence on the performance of the antenna. Especially TRP (Total Radiated Power, total radiated power) and TIS (Total Isotropic Sensitivity, total omnidirectional sensitivity) and antenna efficiency are very important indicators of mobile phones, which affect the performance of the whole machine and determine the success or failure of the product. [0003] Impedance matching refers to a working state in which the load impedance and the internal impedance of the excitation source are mutually matched to obtain the maximum power output. It reflects the power transfer relationship between the input circuit and the o...

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Problems solved by technology

[0009] However, the above methods have some disadvantages. For example, the matching form of mode 1 is fixed, which is not conducive to multi-band adjustment; in mode 2, only different matching forms can be selected, and the matching forms are complex and redundant, and for each combination form, they are also quite independent and fixed. There is no fine-tuning function; method 3 provides fixed matching devices for each antenna, which is only used in multi-antenna RF systems; method 4 is based on traditional variable capacitance adjustment impedance matching, the adjustment range is narrow, and the adjustment ability is weak, which cannot meet the current requirements. Matching requirements for multiple applications

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