CN220492966U

CN220492966U - Radio frequency impedance matching converter

Info

Publication number: CN220492966U
Application number: CN202321766253.0U
Authority: CN
Inventors: 胡鹏; 李良; 任东; 薛伟杰
Original assignee: Guangdong Dongdian Testing Technology Co ltd
Current assignee: Guangdong Dongdian Testing Technology Co ltd
Priority date: 2023-07-06
Filing date: 2023-07-06
Publication date: 2024-02-13
Anticipated expiration: 2033-07-06

Abstract

The utility model relates to the technical field of testing, in particular to a radio frequency impedance matching converter. The technical scheme includes that the portable electronic device comprises an outer shell, and a signal input end and a signal output end which are respectively arranged at two ends of the outer shell; the signal input end is connected with the signal output end of the external signal generator and is used for inputting signals into the converter; the signal output end is connected with an external receiver signal end and is used for conveying the converted signal to a receiver. According to the utility model, a signal is input to the signal input end of the converter through the signal generator, and the harmonic signal passing through the signal input end of the first filter circuit is matched with impedance through the impedance conversion matching circuit and converted. Before the signal is output to the receiver, the second filter circuit is used for filtering harmonic signals at the signal output end of the converter, so that impedance conversion is realized, and meanwhile, the signal is effectively input to the receiver.

Description

Radio frequency impedance matching converter

Technical Field

The utility model relates to the technical field of testing, in particular to a radio frequency impedance matching converter.

Background

In the current test of audio and video products, radio frequency signals are required to be injected into the products, but the output impedance of a general vector signal generator is 50 ohms, and the receiving tuner of a receiver (such as tuner of a television, tuner of an AM/FM receiver, set-top box and other products) is 75 ohms, so when the sensitivity of the receiver, overload of the receiver, blocking of the receiver and other projects are tested, an impedance matching conversion is required, and the port impedance of signal output end equipment and signal receiving end equipment is perfectly matched; most of the existing televisions at the outlet are provided with DVB-T/T2 and DVB-S/S2, wherein the DVB-S module has a voltage of about 19V at the input end of the tuner, which causes signal mismatch and frequent damage to the output port of the signal generator.

The problem that the receiver signal is unstable and normal test cannot be performed due to impedance mismatch in the current test process is solved, and the problem that test equipment and an impedance converter are damaged frequently is also solved. In the case of impedance mismatch, both-and-shot will be present on the transmission line. From the transmission point of view, every effort is made to avoid the occurrence of impedance mismatch phenomena, because the occurrence of reflected waves means that the power delivered to the transmission line terminals cannot be absorbed by the load entirely, reducing the transmission efficiency; in the case of high transmission power, the antinode of the voltage or current may damage the medium of the transmission line; in addition, the input impedance at the beginning of the transmission line changes with frequency, and distortion occurs when the multi-frequency signal is transmitted because the impedance of the transmission line and the impedance of the transmission line are difficult to match.

The consequences of impedance mismatch in digital circuits are as follows:

1. the digital signal is reflected back and forth at the input of the receiving device and at the output of the transmitting device. The reflected signal bounces back and forth on both sides until eventually completely absorbed by the resistor.

2. The reflected signal introduces a ringing signal to propagate along the trace. Ringing affects the voltage and timing of the signal and severely affects signal quality.

3. A mismatched signal path will cause the signal to radiate into the environment.

Disclosure of Invention

Aiming at the problems in the background technology, the utility model provides a radio frequency impedance matching converter which enables signals of a signal generator to effectively reach a receiver.

The technical scheme of the utility model is as follows: the radio frequency impedance matching converter comprises an outer shell, and a signal input end and a signal output end which are respectively arranged at two ends of the outer shell;

the signal input end is connected with the signal output end of the external signal generator and is used for inputting signals into the converter;

the signal output end is connected with an external receiver signal end and is used for conveying the converted signal to a receiver.

Preferably, a first filter circuit, an impedance conversion matching circuit and a second filter circuit are arranged in the outer shell;

the first filter circuit is used for filtering harmonic signals of the signal input end of the converter;

the second filter circuit is used for filtering harmonic signals at the signal output end of the converter.

Preferably, the outer shell is made of a metal shell material.

Preferably, the converter employs a straightener.

Preferably, the impedance of the signal input terminal is 50Ω.

Preferably, the impedance of the signal output end is 75Ω.

Compared with the prior art, the utility model has the following beneficial technical effects:

according to the utility model, a signal is input to the signal input end of the converter through the signal generator, and the harmonic signal passing through the signal input end of the first filter circuit is matched with impedance through the impedance conversion matching circuit and converted. Before the signal is output to the receiver, the second filter circuit is used for filtering harmonic signals at the signal output end of the converter, so that impedance conversion is realized, and meanwhile, the signal is effectively input to the receiver.

Drawings

FIG. 1 shows a schematic diagram of an embodiment of the present utility model;

fig. 2 shows a schematic diagram of an access signal generator and receiver of the present utility model;

FIG. 3 is a schematic diagram of the present utility model;

fig. 4 is an internal circuit diagram of the present utility model.

Reference numerals: a 10 converter; an outer housing; 12 signal output terminals; 13 signal input terminal; a 20 signal generator; 30 receiver.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Examples

As shown in fig. 1 and 2, the rf impedance-matching converter according to the present utility model includes an outer housing 11, and a signal input terminal 13 and a signal output terminal 12 respectively disposed at two ends of the outer housing 11;

the signal input end 13 is connected with the signal output end of the external signal generator 20 and is used for inputting signals into the converter;

the signal output 12 is connected to an external signal terminal of the receiver 30 for transmitting the converted signal to the receiver 30.

As shown in fig. 3 and 4, specifically, a first filter circuit, an impedance conversion matching circuit, and a second filter circuit are disposed in the outer case 11;

the first filter circuit is used for filtering harmonic signals of the signal input end 13 of the converter 10;

the second filter circuit is used for filtering harmonic signals of the signal output end 12 of the converter 10.

The impedance of the signal input terminal 13 is 50Ω. The impedance of the signal output 12 is 75Ω.

The signal generator 20 inputs a signal to the signal input terminal 13 of the converter 10, and the harmonic signal passing through the signal input terminal 13 of the first filter circuit is impedance-matched by the impedance conversion matching circuit and converted. The second filter circuit is used to filter out harmonic signals at the signal output 12 of the converter 10 before the signals are output to the receiver 30, thereby achieving impedance conversion and improving the effective input of the signals to the receiver.

The outer shell 11 is made of a metal shell material. The metal shell can effectively shield interference signals.

The converter adopts a straight blocking device. The voltage of the antenna end of the product or the floating voltage can be effectively isolated by using the straight-blocking device, and the signal generator can be effectively protected.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "configured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically coupled, directly coupled, or indirectly coupled via an intermediate medium. The specific meaning of the above terms in the present utility model is understood by those of ordinary skill in the art according to the specific circumstances.

The above-described embodiments are merely one or several preferred embodiments of the present utility model, and many alternative modifications and combinations of the above-described embodiments will be apparent to those skilled in the art based on the technical solutions of the present utility model and the related teachings of the above-described embodiments.

Claims

1. A radio frequency impedance matching converter (10), characterized by: comprises an outer shell (11), a signal input end (13) and a signal output end (12) which are respectively arranged at two ends of the outer shell (11);

the signal input end (13) is connected with a signal output end of an external signal generator (20) and is used for inputting signals into the converter;

the signal output end (12) is connected with the signal end of an external receiver (30) and is used for conveying the converted signal to the receiver (30);

a first filter circuit, an impedance conversion matching circuit and a second filter circuit are arranged in the outer shell (11);

the first filter circuit is used for filtering harmonic signals of a signal input end (13) of the converter (10);

the second filter circuit is used for filtering harmonic signals of the signal output end (12) of the converter (10).

2. A radio frequency impedance matching converter (10) according to claim 1, characterized in that the outer housing (11) is made of a metal housing material.

3. A radio frequency impedance matching converter (10) according to claim 1, characterized in that the converter employs a dc-divider.

4. A radio frequency impedance matching converter (10) according to claim 1, characterized in that the impedance of the signal input (13) is 50Ω.

5. A radio frequency impedance matching converter (10) according to claim 1, characterized in that the impedance of the signal output (12) is 75 Ω.