KR20040025083A - Antenna system having repeater for reducing a signal loss in cable - Google Patents

Abstract

PURPOSE: An antenna embedded repeater system is provided to reduce the size and weight of the repeater system, while minimizing losses of intensity of signal between the antenna and repeater circuit. CONSTITUTION: An antenna embedded repeater system comprises an outdoor unit(100) and an indoor unit(200). The outdoor unit includes a link antenna(110); and a first repeater circuit embedded in the link antenna, wherein the first repeater circuit low-noise amplifies the forward Tx signal received from a base station through the link antenna, and power amplifies the reverse Rx signal and outputs the amplified signal through the link antenna. The indoor unit is connected to the outdoor unit through an RF cable. The indoor unit includes a coverage antenna(230); and a second repeater circuit embedded in the coverage antenna, wherein the second repeater circuit processes the forward Tx signal received from the outdoor unit through the RF cable and outputs the processed signal to the terminal through the coverage antenna, and processes the reverse Rx signal received from the terminal and outputs the processed signal to the outdoor unit through the RF cable.

Description

Antenna system having repeater system {Antenna system having repeater for reducing a signal loss in cable}

The present invention relates to a repeater. More specifically, the circuit of the repeater is separated and relates to an antenna embedded repeater system embedded in the base station-oriented antenna and the terminal-oriented antenna respectively.

1 is an exemplary view showing the configuration of a conventional home-type repeater, Figure 2 is an exemplary view for explaining the signal loss by the cable between the antenna and the repeater at the transmitting and receiving end of the conventional home-type repeater.

The repeater includes a base station oriented antenna 10, a terminal oriented antenna 11, a repeater circuit portion 12 coupled to the terminal oriented antenna 11, a base station oriented antenna 10 and a repeater circuit portion 12 located outside the building. ) Is composed of an RF cable (13) for electrically connecting. When the repeater is represented by an equivalent circuit and simulated, it can be seen that a large difference occurs in the output of the repeater due to the loss between the base station-oriented antenna and the transmit / receive amplifier in the repeater.

As shown in FIG. 2, in the existing repeater, the cable loss between the antenna and the main body of the repeater, that is, the signal loss, has a great effect on the reception sensitivity and the transmission output. In the case of the forward Tx signal, in the conventional repeater represented by an equivalent circuit, the power loss by the RF cable 13 is about ?? 6 dB, and the noise figure of the LNA 14 is about 7 dB higher, indicating that the repeater It greatly affects the reception sensitivity. Moreover, 1W should be transmitted, which causes 0.25W to be finally output due to cable loss. Therefore, if you want to transmit 1W, 4W HPA should be used, resulting in relatively high MC burden, deterioration and system.

In addition, since components such as the heat generating LNA 14 and the PA 15 are gathered in one place, many methods are used to solve heat dissipation. Typical methods include adding a heat sink, adding a heat pipe, adding a FAN, adding a cooling device, and the like. As a result, the weight and volume of the repeater enclosure exterior are increased, and the cost burden is increased.

Accordingly, in order to solve the above problems, an object of the present invention is to provide a repeater system with a built-in antenna that can overcome the decrease in the reception sensitivity of the repeater due to the cable loss and the power attenuation of the transmission signal. To this end, by minimizing the loss between the base station-oriented antenna and the LNA of the forward link (lower than 1.0 dB), the noise figure of the LNA is improved, thereby improving the reception sensitivity of the repeater and minimizing the loss between the base station facing antenna and the PA of the reverse link. To overcome the power attenuation of the transmission signal.

Another object of the present invention is to provide an antenna-integrated repeater system that can solve the heat problem of the existing repeater by separating the heat generating parts of the repeater circuit unit and embedded in the base station-oriented antenna and the terminal-oriented antenna, respectively.

In addition, another object of the present invention is to provide a repeater system with a built-in antenna that can be configured in an environmentally friendly shape, such as ornaments mechanical appearance.

1 is an exemplary diagram showing the configuration of a conventional home-type repeater.

Figure 2 is an exemplary view for explaining the signal loss caused by the cable between the antenna and the repeater in the transceiver of the conventional home-type repeater.

Figure 3 is a block diagram showing the configuration of an antenna built-in repeater system according to a preferred embodiment of the present invention.

Figure 4 is a block diagram showing the configuration of the indoor unit of the antenna built-in repeater system according to another embodiment of the present invention.

In order to achieve the above object, according to a preferred embodiment of the present invention, in the antenna embedded repeater system in which the circuit of the repeater is separated into the base station-oriented antenna and the terminal-oriented antenna, in the base station-oriented antenna and the base station-oriented antenna An outdoor unit and a radio wave shading area built-in, comprising a first repeater circuit unit for low noise amplifying and outputting a forward Tx signal received from a base station through the base station oriented antenna, and amplifying a reverse Rx signal through the base station oriented antenna Installed in the terminal unit, and connected to the outdoor unit through an RF cable, embedded in the terminal oriented antenna and the terminal oriented antenna, and processing the forward Tx signal received from the outdoor unit through the RF cable to direct the terminal. Output to terminal via antenna And an indoor unit including a second repeater circuit unit configured to process a reverse Rx signal received from the terminal and to output the reverse Rx signal to the outdoor unit through the RF cable, wherein the first repeater circuit unit and / or the second repeater circuit unit Is provided with an antenna embedded repeater system that compensates for the power loss of the forward Tx signal and the reverse Rx signal by the RF cable by adjusting the power of the forward Tx signal and the reverse Rx signal.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the description of the present invention with reference to the embodiments is intended to facilitate understanding of the present invention by those skilled in the art to which the present invention pertains, and it is described in the accompanying drawings and detailed description. It is not limited to an Example.

3 is a block diagram showing the configuration of an antenna-equipped repeater system according to a preferred embodiment of the present invention.

According to a preferred embodiment of the present invention, the low noise amplifier of the forward link (hereinafter referred to as LNA) and the PA of the reverse link which are located in the conventional repeater circuit portion are embedded in the base station oriented antenna, and the rest of the repeater circuit portion. Is built into the terminal-oriented antenna. This minimizes the loss formed between the base station-oriented antenna and the LNA or PA, and reduces the noise figure at the receiving end to improve the reception sensitivity. It is not necessary to output to an amplifier (hereinafter referred to as a PA). In general, the repeater circuit unit includes a forward channel for processing the forward Tx signal received from the base station and a reverse channel for processing the Rx signal received from the terminal. Each channel includes an LNA for low noise amplifying the input signal and a PA for amplifying the power of the input signal, wherein the amplifier is the most heat generating part of the circuit part. Referring to FIG. The repeater system includes an outdoor unit 100 installed outside the building and an indoor unit 200 installed inside the building, and each unit is integrated with an antenna. The outdoor unit 100 and the indoor unit 200 are connected by an RF cable. A general repeater includes a processing unit converting an RF signal into an IF signal and then converting the RF signal into an RF signal, but the antenna embedded repeater system illustrated in FIG. 3 mainly performs power attenuation and compensation processes of the forward Tx signal and the reverse Rx signal. To illustrate, only the amplifier part of the repeater is shown. The outdoor unit 100 is coupled between a duplexer 120 coupled to a base station oriented antenna (Link antenna) 110, a duplexer 130 coupled to an RF cable, and the duplexers 120 and 130 to form a forward channel. And a PA 150 coupled between the forming LNA 140 and the duplexers 120 and 130 to form a reverse link. Here, the operating power required for driving the LNA 140 and the PA 150 of the outdoor unit 100 is supplied from the indoor unit through the RF cable.

The duplexer 120 is configured as a Tx / Rx band pass filter, and supplies the forward Tx signal received from the base station to the indoor unit 200 to the LNA 140, and receives the reverse Rx signal input from the indoor unit 200. Amplified by the PA 150 and output to the base station-oriented antenna (110). Here, the frequency band of the forward Tx signal and the frequency band of the reverse Rx signal may be changed according to a communication method, for example, cellular, PCS, GSM, or IMT. Therefore, the present invention can be applied regardless of the communication method by replacing the duplexer with a duplexer having an operating frequency corresponding to the communication method. The duplexer 130 outputs the forward Tx signal output from the LNA 140 to the indoor unit 200 through the RF cable, and the reverse Rx signal output from the indoor unit 200 through the RF cable to the PA 150. The LNA 130 low noise amplifies the forward Tx signal received from the base station through the base station oriented antenna 110 and outputs it to the duplexer 130, and filters the reverse signal amplified by the PA 150. . The PA 150 amplifies the power of the reverse Rx signal received from the indoor unit 200 and outputs the amplified power to the duplexer 120.

Referring back to FIG. 3, the indoor unit 200 includes a duplexer 210 coupled to an RF cable, a bias tee 220 coupled between a power source and an RF cable, a terminal-oriented antenna 230, A duplexer 240 coupled to the terminal-directed antenna 230, a drive amplifier 251 (hereinafter referred to as DA) which is coupled between the duplexers 210 and 240 to form a forward channel, and a variable attenuator 252. ) And PA 253, and LNA 254, variable attenuator 255, and DA 256 coupled between the duplexers 210 and 240 to form a reverse channel.

The forward channel DA 251 adjusts the gain between the LNA 140 of the outdoor unit 100 and the PA 253 of the indoor unit 200, and also adjusts the gain of the forward Tx signal attenuated by the RF cable. Perform the function. The DA 256 of the reverse channel adjusts the gain between the LNA 245 of the indoor unit 200 and the PA 150 of the outdoor unit 100, and also adjusts the gain of the reverse Rx signal attenuated by the RF cable. Perform the function.

The duplexer 210 coupled to the RF cable outputs the forward Tx signal received from the outdoor unit 100 to the DA 251, and outputs the reverse Rx signal output from the DA 256 to the RF cable. The duplexer 240 coupled to the terminal-oriented antenna 230 outputs the forward Tx signal input from the PA 253 to the terminal-oriented antenna 230, and outputs the reverse Rx signal received from the terminal to the LNA 254. .

The bias tee 220 coupled between the contact point of the RF cable and the duplexer 210 and the power supply supplies driving power according to operating characteristics of each component of the outdoor unit 100 and each component of the indoor unit 200. . In particular, the driving power supply to the outdoor unit 100 is made via an RF cable. In addition, the bias tee 220 prevents an RF signal such as a forward Tx signal or a reverse Rx signal from being applied to a power source.

Hereinafter, the operation of the above-described antenna built-in repeater system will be described.

First, the forward Tx signal will be described. The forward Tx signal transmitted from the base station is input to the duplexer 120 through the base station oriented antenna 110. The forward Tx signal applied to the duplexer 120 is input to the LNA 140 forming the forward channel, amplified low noise, and then output to the indoor unit 200 by the duplexer 130. At this time, the forward Tx signal is attenuated by about 6 dB by the RF cable. The duplexer 210 of the indoor unit 200 receiving the forward Tx signal attenuated by the RF cable outputs the forward Tx signal to the forward channel. In the forward channel, the forward Tx signal, which is low noise amplified by the outdoor unit 100 and whose power is attenuated by the RF cable, is amplified and transmitted to the terminal through the terminal-oriented antenna 230.

In the case of the reverse Rx signal, the reverse Rx signal received from the terminal is input to the duplexer 240 through the terminal-oriented antenna 230. The duplexer 240 outputs the input reverse Rx signal through the reverse channel. The reverse channel outputs the reverse Rx signal to the outdoor unit 100 through the duplexer 210 after performing amplification for low noise amplification and power loss compensation by the RF cable. The duplexer 130 coupled to the RF cable outputs a reverse Rx signal received from the indoor unit 100 to the PA 150. In the PA 150, the reverse Rx signal is power amplified and output through the duplexer 120 to the base station oriented antenna 110.

In the present embodiment, the power loss compensation by the RF cable has been described as being performed in the indoor unit, but in other embodiments, it is obvious that the outdoor unit may be performed.

Figure 4 is a block diagram showing the configuration of the indoor unit of the antenna built-in repeater system according to another embodiment of the present invention.

Referring to FIG. 4, the indoor unit 200 may further include an RF detector located at the terminal-oriented antenna 230 side. Here, the RF detector is composed of a diode 260 and a bar graph meter 270 coupled thereto. The diode 260 detects a forward Tx signal output from the terminal-oriented antenna 230 of the indoor unit 200 and generates an electrical signal corresponding to the detected signal strength. The generated electrical signal is represented by bar graph meter 270. Therefore, when installing and relocating the repeater through the intensity of the signal displayed by the bar graph meter 270 to install the antenna direction in the outdoor unit 100 in a good position, and separately when controlling the strength of the signal Easy to adjust even without measuring equipment.

In the present specification, an antenna-embedded repeater system including an antenna having a LNA that is a preamplifier of a forward channel of a repeater circuit and a PA repeater that is a post-amplifier of a reverse channel, and an antenna having a circuit portion other than LNA and PA, with reference to the embodiment. Explained. However, the present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention. In addition, the scope of the present invention can be interpreted only by the claims described below.

As described above, according to the present invention, the circuit part of the repeater is partially built in and separated from the antenna, so that the system can be miniaturized and reduced in weight, and characteristics are improved because the loss of signal strength between the antenna and the repeater circuit part is minimized.

Therefore, by integrating and embedding a duplexer for separating transmission and reception signals into a base station-oriented antenna, an LNA as a preamplifier for a forward channel, and a PA as a postamplifier for a reverse channel, the cable loss, which is a serious problem in the conventional repeater, is reduced. The repeater system with a built-in antenna according to the present invention can produce a higher output than a conventional repeater in its class.

In addition, the power loss compensation by the RF cable is made by the present invention, it is possible to use a cable lower than the current quality of the RF cable required for the installation and relocation of the repeater. Therefore, the cost required for installation and relocation of the repeater can be reduced, and the characteristics can be kept constant regardless of the distance between the antenna and the repeater circuit portion.

In addition, deterioration can be minimized by separating the heat generating portion of the repeater according to the present invention, thereby extending the life of the repeater.

In addition, when the call volume increases, the reception radius may artificially increase the transmission radius in a non-urban area where the call radius is more important than the call capacity due to the characteristics of the mobile communication which is reduced by about 30%. Therefore, the cable loss is prevented by the present invention, and thus the transmission / reception output increase effect is possible, thereby enabling substantial transmission / reception radius expansion, and the base station transmission / reception radius of the mobile communication is increased.

In addition, small-output repeaters installed for the purpose of eliminating narrow shaded areas such as shops and homes require home-friendly repeaters such as desktop frames and wall clocks because they can be miniaturized and lightweight. It can also be implemented in the form.

Claims (6)

In the antenna embedded repeater system in which the circuit of the repeater is separated into the base station-oriented antenna and the terminal-oriented antenna, A base station oriented antenna, A first repeater circuit part embedded in the base station oriented antenna and configured to low noise amplify and output a forward Tx signal received from the base station through the base station oriented antenna, and amplify a reverse Rx signal through the base station oriented antenna Door unit; And Installed in the radio wave shading area, connected with the outdoor unit via RF cable, With a terminal-oriented antenna, It is embedded in the terminal-oriented antenna, processes the forward Tx signal received from the outdoor unit through the RF cable and outputs to the terminal through the terminal-oriented antenna, and processes the reverse Rx signal received from the terminal to the RF An indoor unit including a second repeater circuit unit configured to output to the outdoor unit through a cable, wherein the first repeater circuit unit and / or the second repeater circuit unit controls power of a forward Tx signal and a reverse Rx signal, Repeater system with built-in antenna to compensate for power loss of the forward and reverse Rx signals by RF cable. The method of claim 1, The first repeater circuit unit, A first duplexer coupled to the base station directing antenna; A second duplexer coupled to the RF cable; A low noise amplifier coupled between the first duplexer and the second duplexer for low noise amplifying a forward Tx signal input from the first duplexer; And A power amplifier coupled between the first duplexer and the second duplexer, the power amplifier amplifying the power of a reverse Rx signal input from the second duplexer. The method of claim 1, The second repeater circuit unit, A bias tee coupled between the RF cable and a power supply, supplying driving power according to operating characteristics of the first repeater circuit portion and the second repeater circuit portion, and preventing a forward Tx signal and a reverse Rx signal from flowing into the power supply; (bias tee); A first duplexer coupled to the RF cable; A second duplexer coupled to the terminal-directed antenna; a forward drive amplifier for amplifying the power of the forward Tx signal output from the first duplexer; A forward variable attenuator for adjusting a gain of a forward Tx signal output from the forward DA; A forward power amplifier amplifying the power of the forward Tx signal output from the forward variable attenuator and outputting the amplified power to the second duplexer; A reverse low noise amplifier for low noise amplifying the reverse Rx signal output from the second duplexer; A reverse variable attenuator for adjusting a gain of a reverse Rx signal output from the reverse low noise amplifier; And And a reverse drive amplifier configured to amplify the power of the reverse Rx signal outputted from the reverse variable attenuator. The method of claim 3, The second repeater circuit unit, A diode which receives a forward Tx signal output from the terminal-oriented antenna and outputs a corresponding voltage signal; And And a display means for displaying the intensity of the voltage signal output from the diode. The method of claim 4, wherein And the display means is a bar graph meter. The method of claim 1, The indoor unit is an antenna built-in repeater system that can configure the appearance in the shape of an indoor article.