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Radio frequency matching circuit and radio frequency system

A technology of radio frequency matching and matching circuit, which is applied in the field of radio frequency matching circuit and radio frequency system, can solve the problems of reducing the complexity of the impedance matching network and failing to improve the power loss in the wide frequency band, so as to shorten the radio frequency debugging time and speed up the research and development Progress, the effect of filtering out harmonic interference

Active Publication Date: 2017-12-15
扬州茂德电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention provides an active broadband matching structure applied to power amplifiers, which can effectively reduce the complexity of the impedance matching network, reduce chip area and cost, but cannot improve the problem of power loss in the broadband band

Method used

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  • Radio frequency matching circuit and radio frequency system
  • Radio frequency matching circuit and radio frequency system
  • Radio frequency matching circuit and radio frequency system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] like Figure 1-2 As shown, this embodiment provides a radio frequency matching circuit, and the radio frequency matching circuit includes: an L-shaped matching circuit 210, a first transmission line 220, and a second transmission line 230, and the first transmission line 220 and the second transmission line 230 are connected Two sections of open transmission lines in parallel are formed, a transmission line connection point is formed between the first transmission line 220 and the second transmission line 230 , and the transmission line connection point is connected to the L-shaped matching circuit 210 . When one end of the transmission line is open, the impedance of the other end will be infinitely small, which can meet the loss of less power. Therefore, the connected transmission line in the circuit design of this embodiment is set to be open.

[0036] Cables for transmitting radio frequency signals are generally called transmission lines, and there are two commonly u...

Embodiment 2

[0040] The difference between this embodiment and the previous embodiments is that this embodiment provides a radio frequency matching circuit with better broadband matching performance, wherein the lengths of the first transmission line 220 and the second transmission line 230 are different. The characteristics of a transmission line are usually related to the number of wavelengths of the length, and people usually use the number of wavelengths to describe the length of the transmission line, rather than the absolute length, so the length here is defined as the number of wavelengths.

[0041] Experimental data proves that when the lengths of the first transmission line 220 and the second transmission line 230 are different, better radio frequency matching effects can be produced, especially for wide-screen radio frequency signals, which can greatly reduce the power loss of radio frequency signals during transmission. Keep the voltage standing wave ratio (VSWR) at the different...

Embodiment 3

[0045] like Figure 4-Figure 7 As shown, the difference between this embodiment and Embodiment 2 is that this embodiment provides more combinations of components of the L-shaped matching circuit in a radio frequency matching circuit, and the L-shaped matching circuit 210 includes: a first matching element 211 and A second matching element 212 , one end of the first matching element 211 is grounded, and the other end is connected to the connection point of the transmission line through the second matching element 212 .

[0046] The first matching element 211 is a capacitor or an inductor, and the second matching element 212 is a capacitor or an inductor. Here, the first matching element 211 and the second matching element 212 are set as capacitors or inductors, which can be used to meet the matching of conventional signals and ensure greater transmission of signals. Among them, the capacitance value and inductance value depend on the working frequency band, and the capacitance...

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Abstract

The invention discloses a radio frequency matching circuit and a radio frequency system. The radio frequency matching circuit comprises an L-form matching circuit, a first transmission line and a second transmission line, wherein the first transmission line and the second transmission line are connected to form two sections of open circuit transmission lines in parallel; a transmission line connection point is formed between the first transmission line and the second transmission line; the transmission line point is connected with the L-form matching circuit and can be arranged at the output end of a radio frequency power amplifier and used for an in-band signal power loss problem of the radio frequency (especial the wide frequency band radio frequency), and the echo interference is greatly reduced; the radio frequency system comprises radio frequency transmitting / receiving circuits connected in order, the above-mentioned radio frequency matching circuit, a filtering circuit and an antenna, wherein the lengths of the first transmission line and the second transmission line are different. The system disclosed by the invention can make improvement on a wide frequency band power loss problem and shorten the radio matching debugging time when changing the frequency band port impedance.

Description

technical field [0001] The invention relates to the communication field, in particular to a radio frequency matching circuit and a radio frequency system. Background technique [0002] Radio frequency (Radio Frequency, RF) refers to radio frequency current, which is a high-frequency alternating electromagnetic wave with long-distance transmission capability, and its frequency range is between 300KHz and 300GHz; the radio frequency system is used to generate radio frequency. The main application fields of the system include satellite communication, personal mobile communication (GSM, 4G, etc.), wireless local area network, aviation communication, optical fiber communication, TV and radio broadcasting, etc., which shows that it is widely used. The circuit in the radio frequency system is basically composed of passive components (capacitors, inductors, resistors), active devices and passive networks, and the specific circuits include transmitter circuits, matching circuits, rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40
CPCH04B1/40
Inventor 郭万荣
Owner 扬州茂德电子科技有限公司
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