CN201097459Y - A broadband RF distributor - Google Patents
A broadband RF distributor Download PDFInfo
- Publication number
- CN201097459Y CN201097459Y CNU200720075287XU200720075287XU CN200720075287U CN201097459Y CN 201097459 Y CN201097459 Y CN 201097459Y CN U200720075287XU200720075287X U CNU200720075287XU200720075287X U CN U200720075287XU200720075287XU CN 200720075287 U CN200720075287 U CN 200720075287U CN 201097459 Y CN201097459 Y CN 201097459Y
- Authority
- CN
- China
- Prior art keywords
- coil
- output
- resistor
- distributor
- terminal network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Details Of Television Systems (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The utility model discloses a broadband radiofrequency distributor, which is characterized in that: the output end of the distribution winding is connected into the earth by a first two-port network, simultaneously the output end of the distribution winding is also connected with the output end of the distributor by a second two-port network, a resistor is also connected between the two output ends of the distribution winding, wherein the first two-port network is composed of the resistor and an inductance that are connected in series, the second two-port network is composed of the resistor and a capacitor that are connected in parallel. The utility model has the advantages of improving the reflective loss of input end when the load at output end is open-circuited and changing the balance of output amplitude.
Description
Technical field
The utility model relates to a kind of wide band radio-frequency distributor, particularly a kind of wide band radio-frequency distributor that improves the reflection loss of input when the output load open circuit and change the output amplitude equilibrium specifically is a kind of distributor that improves the reflection loss of input when the output load open circuit and change the cable TV of output amplitude equilibrium.
Background technology
In the coaxial network of cable TV, carrying out of multiple communication service, especially digital communication business is an aspect of network function developing.For ensureing carrying out of digital communication business, require the impedance matching of network, signal frequency response that better index is arranged than before, to satisfy the index requests such as linear distortion of network, the communication of guaranteeing is normal.Like this, require the distributor in the network whether all certain reflection loss should be arranged regardless of its output load open circuit; The amplitude output signal frequency response is smooth.And conventional distributor often can not satisfy these requirements, and the reflection loss of their its inputs when the output load open circuit is all very little; The amplitude output signal frequency response is also uneven, and its amplitude of signal that frequency is low is bigger.Its result can cause the linear distortion index of network to exceed standard, causes error to communication.
Summary of the invention
The purpose of this utility model provides a kind of reflection loss simple in structure, input in the time of can improving the output load open circuit and changes the wide band radio-frequency distributor of output amplitude equilibrium.
To achieve these goals, the technical solution of the utility model is: a kind of wide band radio-frequency distributor, comprise housing, be provided with the winding coil of one group of high frequency transformer in the housing, the primary coil of this winding coil is the impedance conversion coil, the secondary coil of this winding coil is for distributing coil, it is characterized in that distributing each output of coil by the first two-terminal network ground connection, should distribute the output of coil also to be connected with the corresponding output of this distributor simultaneously by second two-terminal network, also be connected with isolation resistor between two outputs of this distribution coil, wherein first two-terminal network is composed in series by resistor and inductor, and the second two-terminal network resistor and capacitor compose in parallel.
The utility model has the advantages that: can improve the reflection loss of input when the output load open circuit, change the output amplitude equilibrium.
Description of drawings
Accompanying drawing 1 is a structural representation of the present utility model
Accompanying drawing 2 is a circuit diagram of the present utility model
Embodiment
Below in conjunction with accompanying drawing and example the utility model is elaborated.
Among the figure, housing 1 is provided with has an input 2 and two outputs 3 at least, one magnetic core 4 is arranged in the housing 1, the winding coil 5 that one group of high frequency transformer is arranged on the magnetic core 4, winding coil 5 elementary is the impedance conversion coil 6 in the coiling of impedance conversion ratio, the secondary of winding coil 5 is to distribute coil 9, and each output-parallel first two-terminal network ground connection of distributing coil 9, this first two-terminal network is that first resistor 7 is in series with inductor 8, each output of the distribution coil 9 of this high frequency transformer is simultaneously also connected and is connect the output port 3 of distributor behind second two-terminal network, this second two-terminal network is that second resistor 11 is formed in parallel with capacitor 10, also connects the 3rd resistor R between two outputs of this high frequency transformer distribution coil 9.
When the utility model output 3 open circuits (not connecting load), it is owing to distribute each output of coil 9 to obtain extra attenuation by first resistor 7 of ground connection and the existence of inductor 8 that cable TV signal forms reflected signal strength at input 2, make the reflected signal energy greatly reduce, thereby improved the reflection loss of input when the output load open circuit.When the utility model output 3 connects load (operate as normal), though arrive the low signal of the cable TV signal frequency of output port 3 because the existence of first resistor 7 and second resistor 11 and by an attenuation part, the signal that frequency is high is because its attenuation of existence of inductance 8 and electric capacity 10 is very little.The output amplitude of distributor also just can be by equilibrium like this.The existing narration of many relevant books is made and be selected in to impedance conversion coil 6, distribution coil 9 and resistor R, and the utility model will not be explained.Usually, the resistor 7 in first two-terminal network is tens to hundreds of ohm, and inductor 8 is tens to the hundreds of nanohenry.Resistor 11 in second two-terminal network is a few to tens of ohms, and capacitor 10 is a few to tens of pico farads.
Claims (1)
1, a kind of wide band radio-frequency distributor, comprise housing, be provided with the winding coil of one group of high frequency transformer in the housing, the primary coil of this winding coil is the impedance conversion coil, the secondary coil of this winding coil is for distributing coil, it is characterized in that distributing the output of coil by the first two-terminal network ground connection, should distribute the output of coil also to be connected with the output of this distributor simultaneously by second two-terminal network, also be connected with resistor between two outputs of this distribution coil, wherein first two-terminal network is composed in series by resistor and inductor, and second two-terminal network is composed in parallel by resistor and capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720075287XU200720075287XU CN201097459Y (en) | 2007-09-30 | 2007-09-30 | A broadband RF distributor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720075287XU200720075287XU CN201097459Y (en) | 2007-09-30 | 2007-09-30 | A broadband RF distributor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201097459Y true CN201097459Y (en) | 2008-08-06 |
Family
ID=39924499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720075287XU200720075287XU Expired - Fee Related CN201097459Y (en) | 2007-09-30 | 2007-09-30 | A broadband RF distributor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201097459Y (en) |
-
2007
- 2007-09-30 CN CNU200720075287XU200720075287XU patent/CN201097459Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080806 Termination date: 20120930 |