KR20080000915A - Impedance matching multiplexer for communication system using cable network inside building and in-building-system thereby - Google Patents

Abstract

An impedance matching multiplexer for a communication system using a cable network constructed in a building and an in-building system using the device are provided to use public TV in-building transmission line equipment of 75-ohm characteristic-impedance commonly completed at the time of construction of a building, or to use security CCTV(Closed Circuit TV) transmission line equipment, thereby solving a shadow area at a relatively low cost. Plural 75-ohm coupling connectors(20) are exposed to the outside of a case(10). One 50-ohm coupling connector(30) is exposed to the outside of the case(10). A heterogeneous impedance matching diplexer(40) comprises an LPF(Low Pass Filter) for passing CATV(Cable TV) signals and CCTV signals only, and an HPF(High Pass Filter) for passing mobile communication/broadcasting signals only, and is connected with the 75-ohm coupling connectors(20). A quarter-wave interface multi-level transmission line(50) connects the 50-ohm connector(30) with the diplexer(40).

Description

Impedance matching multiplexing device for communication system using cable network in building and in-building system using same

1 is a diagram conceptually showing a configuration (Ziplexer-W) of an impedance matching multiplexing device for a communication system using a cable network constructed in the present invention.

2 is a diagram conceptually illustrating a separate configuration (Ziplexer-M) added to an impedance matching multiplexing device for a communication system using a cable network constructed in the present invention.

3 is a graph showing the characteristics of the combined port.

4 is a simulation graph of a 70 Ω-50 Ω converted quarter-wave matched 4-stage transmission line.

5 is a simulation graph of a bandpass filter having different impedance characteristics of an intermediate impedance matching multiplexer according to the present invention.

6 is a simulation graph of a 1/4 wavelength matched single transmission line.

FIG. 7 is a diagram illustrating a configuration of an integrated in-building system using a structure of a impedance matching multiplexing device (Ziplexer-W) for a communication system using a cable network constructed in the present invention.

FIG. 8 is a diagram illustrating the configuration of an integrated in-building system in a large building using Ziplexer-W and Ziplexer-M, which is configured of an impedance matching multiplexing device for a communication system using a cable network constructed in the present invention.

Explanation of reference numerals for the main parts of the drawing

10: case 20: 75Ω connector

30: 50Ω connector 40: Heterogeneous impedance matching diplexer

50: 1/4 wavelength matched multistage transmission line 60: Medium impedance matched multiplexer

70: 1/4 wavelength matched single transmission line

The present invention relates to a mobile communication / broadcasting relay apparatus, and in particular, an in-building light-distribution system and an in-building RF-dispersion system presented as a method for solving a shadow area inside a building, and a cable network for TV viewing. It relates to an apparatus for building using.

Due to the advancement of mobile communication technology and the increase of various services, the dependence on mobile communication in the modern society is increasing rapidly. As a result, mobile operators are investing a lot of capital and facilities to clear up shadow areas. In general, the call quality outside the building is mostly good, but in a dense area of a large city or a high-rise apartment complex, the call quality deterioration due to the shadows inside the building is a big problem.

This problem is called In-Building-Problem in mobile communication, and in general, the signal of mobile communication penetrates one wall in the process of penetrating into the building, and the signal attenuation occurs about 10-15 dB. In particular, the central part of a large building has to pass through several walls, which leads to an inability to talk due to signal attenuation of 30 to 50 dB.

In addition, signals such as WCDMA, GSM1800, Wibro, etc., which use relatively high frequencies, are more severe in-building signal attenuation, leading to a serious degree.

In order to solve such In-Building-Problem, in-building light dispersion, in-building RF dispersion type relay system is usually used.

However, the in-building light-dispersion / RF-dispersion method requires enormous costs by separate construction communication line construction costs, and damage to the building due to the installation of communication cables is inevitable. Exposed cables and track equipment can also damage building aesthetics.

The present invention was devised to solve the above problems, and is usually completed at the construction time of a building without using high-cost line equipment such as light-dispersion / RF-dispersion for mobile communication / broadcasting. The purpose of the present invention is to provide a device capable of constructing a wired / wireless broadcasting / communication In-Building-System by using a transmission line facility of 75 TV characteristic-impedance public hearing TV or using a security CCTV transmission line facility. It is done.

An impedance matching multiplexing device for a communication system using a cable network constructed in the present invention for achieving the technical problem to be achieved by the above-described invention is a case 10 having a predetermined size and a space formed therein, the case A plurality of 75 Ω connection connector 20 exposed to the outside of the case, one 50 Ω connection connector 30 exposed to the outside of the case, located inside the case, the low pass filter passing only the CATV signal and CCTV signal And a high pass filter for passing only a mobile communication / broadcast signal, and connecting the heterogeneous impedance matching diplexer 40 and the heterogeneous impedance matching diplexer connected to the plurality of 75 GHz connection connectors. It is characterized in that it comprises a 1/4 wavelength matched multi-stage transmission line 50 (hereinafter referred to as "Ziplexer-W").

In addition, the apparatus according to the present invention has a predetermined size and a space formed inside the case 10-1 with the Ziplexer-W in order to correspond to a plurality of mobile communication / broadcasting providers, a plurality of exposed to the outside of the case 75 Ω connection connector 20-1 of the plurality of 50 Ω connection connector 30-1 exposed to the outside of the casing, located inside the case, and a low pass filter that passes only the CATV signal and CCTV signal and A heterogeneous impedance matching diplexer 40-1, which includes a high pass filter for passing only a mobile communication / broadcast signal, is connected to the plurality of 75 kHz connection connectors, and is located inside the case. Intermediate impedance-matching multiplexer 60, which is connected to a placer to separate the frequency band of the signal, and 1/4 which connects each of the 50 kHz connection connectors and the intermediate impedance-matching multiplexer. It is characterized by further comprising a wavelength matched single transmission line 70 (hereinafter referred to as 'Ziplexer-M').

In addition, the in-building system according to the present invention is an in-building system for eliminating shadow areas in a building, wherein the cable network constructed in the building consisting of the above-described Ziplexer-W or Ziplexer-W and Ziplexer-M Among the impedance matching multiplexing device for the communication system using the Ziplexer-W characterized in that it comprises.

In addition, the in-building system according to the present invention in order to cope with a plurality of mobile communication / broadcasting providers in the in-building system for eliminating the shadow area in the building, the above-described Ziplexer-W or Ziplexer-W and Ziplexer Among the impedance matching multiplexing device for a communication system using a cable network built in the building consisting of -M characterized in that it comprises the Ziplexer-W and Ziplexer-M.

Hereinafter, an impedance matching multiplexing device and an in-building system using the same for a communication system using a cable network constructed in the present invention with reference to the accompanying drawings.

1 is a diagram conceptually showing a configuration (Ziplexer-W) of an impedance matching multiplexing device for a communication system using a cable network constructed in the present invention. As shown in FIG. 1, the Ziplexer-W includes a case 10, a plurality of 75 Ω connection connectors 20, a 50 Ω connection connector 30, a heterogeneous impedance matching diplexer 40, and a 1/4 wavelength matching multi-stage transmission line. The furnace 50 is comprised.

The case 10 serves to protect component elements installed therein by forming an inner space and being sealed to the outside by assembly. It is typically a general case for protecting parts and is not limited to any particular case.

The 75Ω connector 20 and the 50Ω connector 30 are installed outside the case 10, and are connected to the component elements inside the case 10. Therefore, the 75 Ω connection connector 20 and the 50 Ω connection connector 30 serve to connect the component elements with a cable, and the connector has the same structure as the connection connector used as a means for connecting with a conventional cable. It is not limited to connectors.

The Heterogeneous Impedance Matching Diplexer (40, Dual Impedance Matching Diplexer) is a low pass filter (LPF) that passes only the CCTV signal that does not use the carrier frequency, CATV signal using 5 ~ 650 MHz and 800 ~ 2,500 MHz It consists of HPF (High pass Filter) which passes only mobile communication / broadcasting signal. It has characteristic of coupling port's characteristic-impedance is 75 LP, LPF port's characteristic-impedance is 75Ω and HPF port's characteristic-impedance is 50Ω. .

As shown in the simulation graph of the coupling-port characteristic of FIG. 3, even if the signals have different impedance characteristics, there is no difference in attenuation characteristics, but the return loss shows a significant difference.

Therefore, in the present invention, a method of matching impedance in stages uses a method of matching the characteristic-impedance of the coupling port having the characteristic shown in FIG. 3 (b) to 75 Hz and the characteristic of the HPF port to 70 Hz. At this time, the method of Figure 3 (c) has the effect of switching to 50Ω characteristic at a time, while the Return Loss characteristic is significantly worsened and is excluded from the present invention.

The 1/4 wavelength matched multi-stage transmission line (50, 4-Stage 1 / 4-Wave Length Matching Micro Strip Line) is optimized by a circuit connecting the 50 Ω connection connector 30 and the heterogeneous impedance matching diplexer 40. It works to achieve a match.

The 1/4 wavelength matched multi-stage transmission line 50 is connected to one mobile communication / broadcasting port, and a subscriber-oriented wide-band service antenna is installed therein to provide downlink / uplink service of mobile communication / broadcasting. As shown in the simulation graph of Fig. 4 70Ω-50Ω conversion quarter-wave matching 4-stage transmission line, it has stable return loss characteristics at 800 ~ 2500 MHz.

Ziplexer-W, an impedance matching multiplexing device for a communication system using a cable network constructed in a building as shown in FIG. 1, is a mobile communication / broadcasting repeater and a CATV / CCTV transmission line in an in-building system. It is possible to combine the installation.

However, there is no problem in the case of single-band single-operator, but in the case of multi-band multi-operator, a separate multiplexer or divider / combiner is required, the construction process is cumbersome, and a lot of signal loss occurs. A combination of a repeater / intermediate liner (Line Repeater) and a CATV / CCTV transmission line is preferably Ziplexer-M as shown in FIG.

2 is a diagram conceptually illustrating a separate configuration (Ziplexer-M) added to an impedance matching multiplexing device for a communication system using a cable network constructed in the present invention. As shown in FIG. 2, the Ziplexer-M includes a case 10-1, a plurality of 75 Ω connection connectors 20-1, a plurality of 50 Ω connection connectors 30-1, and a heterogeneous impedance matching diplexer 40-40. 1), an intermediate impedance matching multiplexer 60 and a quarter wavelength matching single transmission line 70.

The Inter Impedance Matching Multiplexer (60) is configured to separate the frequency band of a signal in order to correspond to various Multi-Band Multi-Operators using various frequencies. 60), the intermediate impedance matching multiplexer 60 is also connected to the plurality of 50 kHz connection connectors 30-1 and the 1/4 wavelength matching single transmission line 70 as described in FIG.

Such an intermediate impedance matching multiplexer 60 is different from the attenuation characteristic even if the signal has different impedance characteristics as shown in the simulation graph of the bandpass filter of different impedance characteristics of the intermediate impedance matching multiplexer according to the present invention. Although there is no, Return Loss characteristics, such as the heterogeneous impedance matching diplexer 40 of the Ziplexwe-W of FIG.

Therefore, in the present invention, a band pass filter having an input of 70 Hz and an output of 65 Hz having characteristics as shown in FIG. 5 (b) is used for matching the stepped impedance and stable return loss characteristics.

The intermediate impedance matching multiplexer 60, which consists of a plurality of such band pass filters, has the effect of eliminating crosstalk noise with respect to other signals and suppressing second-harmonics by a line repeater.

The single stage 1 / 4-wave length matching transfer strip line (70) is a circuit connecting the intermediate impedance matching multiplexer 60 and each of the 50 Ω connectors to achieve an optimized match. It works.

Such a 1/4 wavelength matched single transmission line 70 has a characteristic impedance of 50 Ω using a 1 / 4-wave matched single transmission line as shown in FIG. 6 1/4 wavelength matched single transmission line simulation graph. There is a method of switching to the characteristic impedance, but as shown in the simulation graph of FIG. 6 (a), the section showing return loss of 25 dB or more is unstable about 1 / 3-octave, and the simulation graph of FIG. 6 (b). As shown in Figure 6, when the characteristic impedance of 50Ω is converted to 65Ω characteristic impedance, which is the intermediate impedance by using a 1 / 4-wavelength matched single transmission line, a section with a return loss of 25dB or more is formed to be about 2 / 3-octave, resulting in stable characteristics. You can get it.

Therefore, the present invention uses the method of FIG. 6 (b) which has a stable return loss characteristic by stepwise impedance matching.

In addition, since the heterogeneous impedance matching diplexer 10 of FIG. 1 and the intermediate impedance matching multiplexer 60 of FIG. 2 must have a cross band rejection of 42 dBc or more, to achieve such suppression. Since the performance of the cavity type is excellent, but the price and the volume are large, the present invention uses a method in which an LC (Inductor & Capacitor) Lumped Element is integrated. As a result, the impedance matching multiplexing apparatus (Zipler-W, Zipler-M) according to the present invention eliminates crosstalk noise and high frequency harmful noise of CATV / CCTV signals. That is, it improves the S / N ratio (Signal & Noise Ratio) to provide good image quality, and the mobile communication / broadcast signal also removes low frequency harmful noise to improve Ec / Io quality.

The impedance matching multiplexing apparatus (Ziplexer-W, Ziplexer-M) for a communication system using a cable network constructed in the present invention has been described above. Hereinafter, an in-building system using such Ziplexer-W to Ziplexer-M will be described. (Ziplexer-W is denoted as 'Zx-W' and Ziplexer-M is denoted as 'Zx-M' in FIGS. 7 to 8).

FIG. 7 is a diagram illustrating a configuration of an integrated in-building system using a configuration of an impedance matching multiplexing device (Ziplexer-W) for a communication system using a cable network constructed in the present invention. As shown in FIG. 7, the integrated in-building system using the present invention Ziplexer-W combines a Mobile Repeater and a CATV Line Repeater and a Ziplexer-W connected to a Donor Antenna installed outside the building, and the Ziplexer-W. The CATV Dividwe Unit is connected to the TV-Port on the wall of the building and to other Ziplexer-W combined with the Mobile SVC Antenna.

FIG. 8 is a diagram illustrating the configuration of an integrated in-building system in a large building using Ziplexer-W and Ziplexer-M, which is configured of an impedance matching multiplexing device for a communication system using a cable network constructed in the present invention. The present invention as shown in FIG. 8 further includes a Ziplexer-M for coupling with a mobile repeater connected to a plurality of donor antennas. As described above, the Ziplexer-M, which is connected to a plurality of Mobile Repeaters and CATV Line Repeaters, is connected to the TV-Port installed on the wall of the building through the CATV Dividwe Unit and connected to other Ziplexer-W combined with the Mobile SVC Antenna.

As described above, the present invention does not use high-cost line equipment such as optical-dispersion / RF-dispersion of in-building system to solve In-Building-Problem of mobile communication / broadcasting, and generally, construction time of building It has the effect of using the 75 Ω characteristic-impedance public hearing TV premises transmission line facility, or the security CCTV transmission line facility, which can be completed at a relatively low cost.

In addition, through the device according to the present invention there is an effect that can build a wired / wireless broadcasting / communication integrated In-Building-System.

In addition, impedance matching multiplexing devices (Ziplexer-W, Ziplexer-M) eliminate the crosstalk noise and high frequency harmful noise of CATV / CCTV signals, that is, improve the S / N ratio (Signal & Noise Ratio) to improve the image quality. In addition, the mobile communication / broadcast signal also has the effect of improving the Ec / Io quality by eliminating low-frequency harmful noise.

Although the present invention described above has been described in detail only with respect to the specific examples described, it will be apparent to those skilled in the art that various modifications and changes are possible within the technical scope of the present invention, and such modifications and modifications belong to the appended claims. .

Claims (4)

A case having a predetermined size and having a space formed therein; A plurality of 75 Ω connection connectors exposed to the outside of the case; One 50 Ω connection connector exposed to the outside of the case; A heterogeneous impedance matching die located inside the case and including a low pass filter for passing only a CATV signal and a CCTV signal and a high pass filter for passing only a mobile communication / broadcast signal, and connected to the plurality of 75 Ω connection connectors. Flexure; And And a quarter-wave matched multi-stage transmission line connecting the 50 Ω connection connector and the heterogeneous impedance matching diplexer (Ziplexer-W) to a communication system using a cable network constructed in a building. Impedance matching multiplexing device. The method of claim 1, wherein the Ziplexer-W A case having a predetermined size and having a space formed therein; A plurality of 75 Ω connection connectors exposed to the outside of the case; A plurality of 50 Ω connection connectors exposed to the outside of the case; A heterogeneous impedance matching die located inside the case and including a low pass filter for passing only a CATV signal and a CCTV signal and a high pass filter for passing only a mobile communication / broadcast signal, and connected to the plurality of 75 Ω connection connectors. Flexure; An intermediate impedance matching multiplexer located inside the case and connected to the heterogeneous impedance matching diplexer to separate a frequency band of the signal; And And a quarter-wave matched single transmission line connecting the respective 50 kHz connection connectors and the intermediate impedance matched multiplexer (Ziplexer-M). Impedance Match Multiplexer for Systems. In-building system to solve the shadow area in the building, An in-building system using an impedance matching multiplexing device for a communication system using a cable network constructed in a building comprising Ziplexer-W. The method of claim 3, An in-building system using an impedance matching multiplexing device for a communication system using a cable network constructed in a building, further comprising a Ziplexer-M.

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