JP2008295005A - Low/high frequency separator on coaxial line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low/high frequency separator on a coaxial line, which makes it possible to enhance a separation performance between low and high frequency signals, as well as a productivity. <P>SOLUTION: The low/high frequency separator on a coaxial line includes a high band terminal 10 for transferring a high frequency signal, a low band terminal 20 for transferring a low frequency signal, and a mixing terminal 30 for transferring a mixing signal of the high and low frequency signals. It further includes a low pass filter 40 provided between the mixing terminal and the low band terminal for cutting off the high frequency signal and passing only the low frequency signal, a high pass filter 50 provided sequentially between the mixing terminal and the high band terminal for cutting off the low frequency signal and passing only the high frequency signal, and a band pass filter 60 for passing a high frequency signal of a bandwidth of 1.7 to 2.2 GHz. Thus, signal transfer of high quality can be carried out, and a high performance of separation between low and high frequency signals by the band bass filter can be assured, which makes it possible to minimize degradation of characteristics on the line or unfavorable effect on other components due to impedance mismatching. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a low and high frequency separator on a coaxial line, and more specifically, a low frequency terminal, a high frequency filter, and a mixing terminal are mutually connected by minimizing component elements such as a low pass filter, a high pass filter, and a band pass filter. Good quality low-frequency and high-frequency signals are transferred between them, and especially the separation characteristics of low-frequency and high-frequency signals are ensured by a band-pass filter. The present invention also relates to a low and high frequency separator on a coaxial line that can minimize the influence on other component elements.

  In general, CCTV utilizes low frequency signals in the 5-6 MHz frequency band, CATV utilizes low frequency signals in the 50-870 MHz frequency band, FSK modem utilizes high frequency signals in the 900 MHz frequency band, and mobile communication terminals. The machine utilizes high frequency signals in the 1700-2200 MHz frequency band.

  At this time, the low frequency band signal used in CCTV or CATV is usually transferred through a 75Ω coaxial cable, that is, a low frequency line, and used in an FSK modem or a mobile communication terminal. The high-frequency signal is designed to be transferred through a 50Ω coaxial cable, that is, a high-frequency line after passing through the transceiver.

  FIG. 2 is a conceptual diagram showing a use state of a low frequency band separator on a general coaxial line.

  As shown in FIG. 2, the high frequency signal of the FSK modem or the mobile communication terminal transferred through the transceiver 300 installed outside the apartment house or building passes through the high frequency line 210, and the CCTV or CATV frequency. The low-frequency signal of the band passes through the low-frequency line 220, and the high-frequency signal and the low-frequency signal transferred through the high-frequency line 210 and the low-frequency line 220, respectively, are also converted into the low-high frequency separator 100 on the coaxial line. And then transferred to the inside of the apartment house and the building, or underground, along the low-frequency line 220.

  At this time, since the 75Ω coaxial cable for transferring the low frequency signal in the CCTV or CATV frequency band, that is, the low frequency line 220 is embedded in the apartment house or building, the transmission of the low frequency signal is a big problem. However, in order to transfer the high-frequency signal of the FSK modem or mobile communication terminal to the inside of apartment buildings and buildings, or underground, it is necessary to install a 50Ω coaxial cable, that is, a high-frequency line 210. However, in this case, since the installation cost increases and the appearance due to the installation of the additional line is not good, it is desirable to use the low-frequency line 220 already installed in the building or inside the building as much as possible.

  As a result, the low frequency signal of CCTV or CATV frequency band via the external low frequency line 220 and the high frequency signal of the FSK modem or mobile communication terminal via the external transceiver 300 are low on the external coaxial line. After being mixed through the high-frequency separator 100, transferred through the low-frequency line 220 already installed in the apartment house or building, and then hybrid-divided by the low-high-frequency separator 100 on the indoor coaxial line. Thus, the low frequency signal is displayed on a TV or a monitor, and the high frequency signal is transmitted to the mobile communication terminal through the indoor transceiver 300.

  3a and 3b are structural views showing a hybrid connector according to the prior art (2006.03.14. Korean Patent Application No. 10-2006-0023323).

  As shown in FIGS. 3a and 3b, the hybrid connector according to the prior art includes a high frequency terminal 110 for transferring a high frequency signal, a low frequency terminal 120 for transferring a low frequency signal, and a high frequency signal and a low frequency signal. A mixing terminal 130 for transferring a mixing signal, a high band mixing line 140 (High Band Mixing Line) provided between the high band terminal 110 and the mixing terminal 130, and a low band terminal 120 and the mixing terminal 130 are provided. The low-band mixing line 150 (Low Band Mixing Line) and the mixing terminal 130 are connected to the high-band mixing line 140 and the low-band mixing line 150 to form a Chebyshev impedance matching theory. The impedance adjustment unit 161 formed so as to be identical by matching theory) and the impedance adjustment unit 161 One or more high-frequency cutoff elements 151 included in the low-frequency mixing line 150 and one or more included in the high-frequency mixing line 140 so that the loss of two signals identified through the node 161 can be minimized and mixed. The low-frequency cutoff element 141.

  At this time, the impedance adjusting unit 161 is provided in the high frequency mixing line 140 so that when the impedance increases, the width of the line is gradually narrowed, whereas the impedance adjusting unit 161 is provided in the low frequency mixing line 150. When the impedance decreases, the width of the line is gradually increased.

  The high-frequency mixing line 140 includes a low-frequency grounding element 142 so as to prevent noise caused by signals in the non-identical band that are applied to the high-frequency mixing line 140 and the low-frequency mixing line 150 and cannot be transferred. The low-frequency mixing line 150 is provided with a high-frequency grounding element 152.

  However, the hybrid connector according to the prior art described above includes a high-frequency mixing line 140, a low-frequency mixing line 150, an impedance adjustment unit 161, a high-frequency cutoff element 151, a low-frequency cutoff element 141, a low-frequency grounding element 142, and a high frequency range. Like the grounding element 152, it is composed of a large number of parts and has the disadvantage that the productivity of the product is remarkably reduced.

  The present invention has been developed to solve the above-described problems, and includes a low-pass filter, a high-pass filter, and a band-pass filter with minimized component elements between low-frequency terminals, high-frequency terminals, and mixing terminals. A low and high frequency separator on a coaxial line that can improve the separation characteristics and productivity between low frequency signals and high frequency signals while allowing high quality low frequency and high frequency signals to be transferred. Its purpose is to provide.

  In order to achieve the above object, the present invention provides a high frequency terminal 10 (High Band Terminal) for transferring a high frequency signal (High Band Signal) and a low frequency signal (Low Band Signal; A coaxial line including a low band terminal 20 for transferring a low band signal (Low Band Terminal) and a mixing terminal 30 for transferring a high band signal and a mixing signal for the low band signal (Mixing Terminal) Regarding the low and high band frequency diplexer on the (Coaxial Cable), it is provided between the mixing terminal 30 and the low band terminal 20 to cut off the high band signal and allow only the low band signal to pass. A low-pass filter 40 (Low Pass Filter), a high-pass filter 50 (High Pass Filter) that is provided sequentially between the mixing terminal 30 and the high-frequency terminal 10 and blocks the low-frequency signal and passes only the high-frequency signal; Bandpass filter 60 for passing a high-frequency signal .7~2.2GHz band (Band Pass Filter) and the basic features on the technical configuration include (claim 1).

  The low-pass filter 40 may be configured to pass a low-frequency signal of 5 to 6 MHz frequency band of CCTV or a low-frequency signal of 50 to 870 MHz frequency band of CATV (Claim 2).

  Further, the high-pass filter 50 may be configured to pass a high-frequency signal in the 1.7 GHz frequency band of PCS or a high-frequency signal in the 2 GHz frequency band of WCDMA (Claim 3).

  The low and high frequency separators on the coaxial line according to the present invention include the low frequency terminal 20, the high frequency terminal 10, and the mixing terminal 30 using the component elements in which the low pass filter 40, the high pass filter 50, and the band pass filter 60 are minimized. Impedance mismatch (Impedance Miss Matching), enabling high-quality low-frequency and high-frequency signals to be transferred between each other and ensuring the isolation characteristics of the low-frequency and high-frequency signals by the bandpass filter 60 ) Can be minimized, and the effect on other component elements can be minimized. This eliminates the need for a prior art impedance matching circuit, so that the excellent effect of minimizing components can be achieved. Have.

  Hereinafter, a preferred embodiment of a low and high frequency separator on a coaxial line according to the present invention will be described with reference to the drawings. A better understanding of the objects, features and advantages of the present invention is provided.

  FIG. 1 is a structural diagram showing a low and high frequency separator on a coaxial line according to the present invention.

  The present invention is designed so that a low-frequency signal and a high-frequency signal can be freely transferred through a low-high frequency separator on a coaxial line, and transfers a high-frequency signal as shown in FIG. It basically includes a high frequency terminal 10, a low frequency terminal 20 for transferring a low frequency signal, and a mixing terminal 30 for transferring a high frequency signal and a low frequency signal.

  At this time, a 50Ω coaxial cable, that is, a high frequency line is connected to the high frequency terminal 10, and a 75Ω coaxial cable, that is, a low frequency line is connected to the low frequency terminal 20.

  More specifically, the low and high frequency separator on the coaxial line according to the present invention is provided between the mixing terminal 30 and the low frequency terminal 20 to cut off the high frequency signal and allow only the low frequency signal to pass. A low-pass filter 40 is provided, and includes a high-pass filter 50 provided between the mixing terminal 30 and the high-frequency terminal 10 to cut off the low-frequency signal and allow only the high-frequency signal to pass. The high-pass filter 50 and the high-frequency terminal 10 includes a band-pass filter 60 that passes a high-frequency signal in the 1.7 to 2.2 GHz band.

  A low-pass filter 40 is provided between the mixing terminal 30 and the low-frequency terminal 20, and with this, a low-pass signal is cut off between the mixing terminal 30 and the high-frequency terminal 10, and only a high-frequency signal is allowed to pass. 50 and 1.7-2.2 GHz band high-pass signal is sequentially provided, band pass filter 60 is sequentially provided, and only the low-frequency signal and high-frequency signal can be transferred with the component elements minimized between each other. Not only can the productivity be remarkably improved, but the isolation characteristics of the low-frequency signal and the high-frequency signal by the bandpass filter 60 are ensured, and the characteristic on the line is reduced due to the impedance mismatch. As a result, the influence on other component elements can be minimized, and this eliminates the need for a prior art impedance matching circuit, thereby minimizing the components. It will be possible.

  The low pass filter 40 applied to the low and high frequency separator on the coaxial line according to the present invention passes a low frequency signal in the 5-6 MHz frequency band of CCTV or a low frequency signal in the 50 to 870 MHz frequency band of CATV. In addition, it is desirable that the high-pass filter 50 allows a high-frequency signal in the 1.7 GHz frequency band of PCS or a high-frequency signal in the 2 GHz frequency band of WCDMA to pass.

With such a configuration, a 1.7 GHz frequency band PCS high frequency signal, or 2 GHz
A WCDMA high-frequency signal in a frequency band can be transferred between the mixing terminal 30 and the high-frequency terminal 10 through a high-pass filter 50 and a band-pass filter 60, and a CCTV low-frequency signal in a 5-6 MHz frequency band, or The low-frequency signal of 50 to 870 MHz frequency band CATV can be transferred between the mixing terminal 30 and the low-frequency terminal 20 through the low-pass filter 40. A band signal and a high band signal can be provided.

FIG. 3 is a structural diagram showing a low and high frequency separator on a coaxial line according to the present invention. The conceptual diagram which shows the use condition of the low high frequency separator on a common coaxial line. FIG. 3 is a structural diagram showing a hybrid connector according to the prior art. FIG. 3 is a structural diagram showing a hybrid connector according to the prior art.

Explanation of symbols

10 High-frequency terminal (high-band terminal)
20 Low frequency terminal (Low frequency terminal)
30 Mixing terminal 40 Low pass filter 50 High pass filter 60 Hand pass filter

Claims (3)

Low-frequency separation on a coaxial line including a high-frequency terminal for transferring a high-frequency signal, a low-frequency terminal for transferring a low-frequency signal, and a mixing terminal for transferring the high-frequency signal and the mixing signal of the low-frequency signal A vessel,
A low-pass filter that is provided between the mixing terminal and the low-frequency terminal, blocks the high-frequency signal, and allows only the low-frequency signal to pass;
A high-pass filter that is sequentially provided between the mixing terminal and the high-frequency terminal, cuts off the low-frequency signal and allows only the high-frequency signal to pass, and a high-frequency signal of 1.7 to 2.2 GHz band. A bandpass filter to pass,
A low and high frequency separator on a coaxial line, comprising:   2. The low-pass filter on the coaxial line according to claim 1, wherein the low-pass filter passes a low-frequency signal of 5 to 6 MHz frequency band of CCTV or a low-frequency signal of 50 to 870 MHz frequency band of CATV. Separator.   3. The low and high frequency separation on a coaxial line according to claim 1, wherein the high pass filter passes a high frequency signal of 1.7 GHz frequency band of PCS or a high frequency signal of 2 GHz frequency band of WCDMA. vessel.

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