REMOVABLE COLLAR FOR MATCHING HIGH FREQUENCY IMPEDANCE AND HIGH FREQUENCY CABLE TELEVISION USING THE SAME
A cable television device with high frequency impedance matching includes a housing and a removable collar. The removable collar is disposed on a signal inputting port or a signal outputting port of the housing and a cable wire is connected to the signal inputting port or a signal outputting port. When a high frequency is inputted, the impedance of the removable collar is substantially close to the impedance of the cable wire to reduce the reflected amount of the transmitting signal and the attenuation of the transmitting high frequency signal.
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1. Field of the Invention
The present invention relates to a high frequency cable television device, and in particular to high frequency cable television having a property of matching high frequency impedance.
2. Description of Prior Art
Cable television signals transmitting in the conventional cable television is split by a video splitter and separately transmitting to different buildings or communities so that the residents in the buildings, communities or companies can receive signals and watch cable television programs.
Because the frequencies of transmitting signals of the conventional cable television becoming higher and higher, and the signal is usually attenuated in the transmission process, the image quality showed in the television of the client end becomes worse. The main reason is due to high frequency impedance mismatched. If high frequency matching is desired, the loading impedance must be equal to or approximate to the impedance of the cable wire during the signal transmission process, and the reflecting amount of the transmitting signal is also reduced.
Therefore, a signal inputting port (or signal outputting port) 101 of the conventional cable television device 10 (shown in
Accordingly, the present invention provides a removable collar. The removable collar is disposed between a signal inputting port or a signal outputting port and a conductive bridge set. When a high frequency signal inputted, the impedance of the removable collar approximate the impedance of the cable wire so that to reduce the reflected amount of the transmitting signal to achieve the purpose of matching high frequency impedance.
Therefore, the present invention provides a removable collar for matching high frequency impedance. The removable collar used for matching high frequency impedance disposed with a signal inputting port and a signal outputting port of a high frequency cable television device and disposed with a signal transmitting terminal of a cable wire, the removable collar includes a main body. The main body has an external surface, the external surface has a joint part for disposing with a signal inputting port and a signal outputting port. The central of the main body having a via hole, the via hole having an inner wall surface and a thick part formed between the external surface and the inner wall surface. The thick part has two symmetrical notches for allowing a tool to clamp thereon, and then the main body of the removable collar is disposed into the signal inputting port or the signal outputting port. When a high frequency signal is inputted, the impedance of the removable collar is substantially close to the impedance of the cable wire so that a reflected amount of the transmitting signal is reduced and an attenuation of the transmitting high frequency signal is reduced.
The present invention further includes a high frequency cable television device having removable collar, the high frequency television device includes a housing, the housing having a signal inputting port on one side of the housing and a signal outputting port on another side of the housing and opposite to the signal inputting port. A conductive bridge set is disposed within the housing and between the signal inputting part and the signal outputting part. Two symmetric assembling parts are disposed on a lateral plane which is adjacent to the signal inputting port and the signal outputting port and corresponding to the conductive bridge set disposed within the housing. The signal inputting part and the signal outputting port respectively has an assembling part having screw thread surface.
A removable collar is disposed in the signal inputting port or the signal outputting port. The removable collar includes a main body. The main body has an external surface, the external surface has a joint part for disposing with a signal inputting port and a signal outputting port. The central of the main body having a via hole, the via hole has an inner wall surface and a thick part formed between the external surface and the inner wall surface. The thick part has two symmetrical notches for allowing a tool to clamp thereon, and then the main body of the removable collar is disposed into the signal inputting port or the signal outputting port. A cable wire includes a core wire, a joint and a signal transmitting terminal. The joint 32 is plugged into the signal inputting port or the signal outputting port and passed through the removable collar. When a high frequency signal is inputted, the impedance of the removable collar is substantially close to the impedance of the cable wire so that a reflected amount of the transmitting signal is reduced and an attenuation of the transmitting high frequency signal is reduced.
The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself, however, may be best understood by reference to the following detailed description of the invention, which describes an exemplary embodiment of the invention, taken in conjunction with the accompanying drawings, in which:
A preferred embodiment of the present invention will be described with reference to the drawings. Reference is made to
Reference is made to
When assembling, the main body 1 of the removable collar is disposed into the signal inputting port 22 (or the signal outputting port 23), the signal transmitting terminal 33 of the joint 32 of the cable wire 3 is plugged into the signal inputting port 22 (or the signal outputting port 23) and passed through the via hole 13, so that the signal transmitting terminal 33 penetrates into conductive pins 241 of the conductive bridge set 24. And then, a smaller screw 26 penetrates into the assembling port 25 and threaded with the conductive pin 241 so that the signal transmitting terminal 33 is fastened to the conducted pins 241 of the conductive bridge set 24. Afterward, a larger screw 27 is threaded through the assembling port 25.
Reference is made to
The calculation of characteristic impedance (Zo) is shown below:
Wherein a is the signal transmitting terminal 33, b is the via hole 13 of the removable collar, u is permeability and c is permittivity.
Referenced is made to
Although the present invention has been described with reference to the foregoing preferred embodiment, it will be understood that the invention is not limited to the details thereof. Various equivalent variations and modifications can still occur to those skilled in this art in view of the teachings of the present invention. Thus, all such variations and equivalent modifications are also embraced within the scope of the invention as defined in the appended claims.
Claims
1. A removable collar used for matching high frequency impedance disposed with a signal inputting port and a signal outputting port of a high frequency cable television device and disposed with a signal transmitting terminal of a cable wire, the removable collar comprising:
- a main body having an external surface and a via hole allowing the signal transmitting terminal to penetrate, the via hole having an inner wall surface, and a thick part formed between the external surface and the inner wall surface;
- wherein, when a high frequency signal is inputted, the impedance of the removable collar is substantially close to the impedance of the cable wire so that a reflected amount of the transmitting signal is reduced and an attenuation of the transmitting high frequency signal is reduced.
2. The removable collar in claim 1, wherein the main body is of circular cylinder shape and made of metallic material.
3. The removable collar in claim 2, wherein the external surface comprising a joint part which is of one of screw shape, smooth surface, arc surface and rough surface.
4. The removable collar in claim 1, wherein the impedance is 75±15 Ω.
5. The removable collar in claim 4, wherein the high frequency characteristic impedance is calculated by the ratio of the diameter of the via hole of the main body and the diameter of the signal transmitting terminal.
6. The removable collar in claim 4, wherein the high frequency characteristic impedance is calculated by the material permittivity of the main body.
7. The removable collar in claim 3, wherein the thick part has two symmetrical notches.
8. The removable collar in claim 5, wherein the inner wall surface of the main body has an isolated layer made of plastic material.
9. A high frequency cable television device used for connecting a cable wire having a core wire, a joint and a signal transmitting terminal, the high frequency cable television device including:
- a housing having a signal inputting port on one side of the housing and a signal outputting port on another side of the housing and opposite to the signal inputting port;
- a removable collar disposed in the signal inputting port and the signal outputting port;
- wherein when the joint is connected to the signal inputting port or the signal outputting port, the signal transmitting terminal passes through the removable collar, when a high frequency signal is inputted, the impedance of the removable collar is substantially close to the impedance of the cable wire so that the reflected amount of the transmitting signal is reduced and the attenuation of the transmitting high frequency signal is reduced.
10. The high frequency cable television device in claim 9, wherein a conductive bridge set is disposed in the housing and between the signal inputting port and the signal outputting port.
11. The high frequency cable television device in claim 10, further comprising two symmetric assembling ports arranged on a lateral surface adjacent to the signal inputting port and the signal outputting port, and the assembling ports are corresponding to the conductive bridge set disposed within the housing.
12. The high frequency cable television device in claim 11, wherein the signal inputting port and the signal outputting port have an assembling part with screw surface, respectively.
13. The high frequency cable television device in claim 12, wherein the removable collar comprises a main body, the main body comprising an external surface and a through hole, the through hole has an inner wall surface, a thick part being formed between the external surface and the inner wall surface.
14. The high frequency cable television device in claim 13, wherein the main body is of circular cylinder shape and made of metallic material.
15. The high frequency cable television device in claim 9, wherein the impedance is 75±15 Ω.
16. The high frequency cable television device in claim 14, wherein the high frequency characteristic impedance is calculated by the ratio of the diameter of the via hole of the main body and the diameter of the signal transmitting terminal.
17. The high frequency cable television device in claim 13, wherein the high frequency characteristic impedance is calculated by the material permittivity of the main body.
18. The high frequency cable television device in claim 14, wherein the external surface has a joint part which is of one of screw shape, smooth surface, arc surface and rough surface.
19. The high frequency cable television device in claim 18, wherein the thick part has two symmetrical notches.
20. The high frequency cable television device in claim 19, wherein the inner surface of the main body has an isolating layer made of plastic material.
Type: Application
Filed: Aug 10, 2011
Publication Date: Nov 1, 2012
Applicant:
Inventor: Chien-Chung LEE (New Taipei City)
Application Number: 13/206,871
International Classification: H03H 7/38 (20060101);