KR101256683B1 - Small-sized integrated radio frequency type repeater - Google Patents

Abstract

The present invention relates to an integrated miniature relay device implemented in an RF method, and in particular, the first and second service (outgoing) antennas 110 and 120, the relay circuit part 200 performing the RF relay function, and the first and second parts. A shield box 400 for protecting the donor (receive) antennas 310 and 320 and the relay circuit 200 is installed in one body (cover) 500; The first service (outgoing) antenna 110 and the first donor (receiving) antenna 310 are formed on the opposite side of the shield box 400, respectively, and the second service antenna 120 is inside the cover 500. It is installed between the surface and the first service (outgoing) antenna 110 and the first service (outgoing) antenna 110, the second donor antenna 320 is an inner surface of the cover 500 and the first donor (receiving) The first donor (receiving) antenna 310 is spaced apart from the antenna 310, characterized in that according to the present invention using a SAW filter or a digital filter having a relatively large delay in implementing an integrated miniature repeater By applying RF method that can use filter with low delay rather than IF method, it realizes minimization of oscillation amount by repeater's delay reduction, so that good output waveform is sent even with low isolation margin. this There is an effect of improving the profits and extending the service range.

 Integrated miniature repeater, RF method, IF method, SAW filter, BPF, DR filter,

Description

Integrated miniature repeater implemented by RF method {SMALL-SIZED INTEGRATED RADIO FREQUENCY TYPE REPEATER}

1 is a view for explaining the oscillation phenomenon of a general repeater,

2 is a functional block diagram showing the internal configuration of an integrated miniature repeater of the IF method using a conventional SAW filter or a digital filter;

3 is a view showing a comparison of the amount of oscillation according to the system delay difference of the repeater,

4 is a table showing a value of the output waveform according to the delay between the antenna and the delay of the repeater system compared to the repeater gain;

5 is a view showing the structure of an integrated miniature repeater implemented in an RF method according to an embodiment of the present invention;

FIG. 6 is an exemplary view illustrating gain gain due to a delay of an integrated miniature repeater implemented in the RF method of FIG. 5;

FIG. 7 is a functional block diagram illustrating an internal configuration of an integrated miniature repeater implemented by the RF method of FIG. 5.

<Explanation of symbols for the main parts of the drawings>

110: first service (outgoing) antenna 111: substrate

112: radiating element 113: feed line

120: second service (outgoing) antenna 121: substrate

122: parasitic element 200: relay circuit

210: first duplex filter 220: RF transmitter

221: first low noise amplifier 222: first bandpass filter

223: first driving amplifier 224: first high output amplifier

230: first duplex filter 240: RF receiver

241: second low noise amplifier 242: second bandpass filter

243: second drive amplifier 244: second high power amplifier

310: first donor (receive) antenna 311: substrate

312: radiating element 313: feeder

320: second donor (receive) antenna 321: substrate

322: parasitic element 400: shield box

500: cover

The present invention relates to an integrated miniature repeater implemented in an RF method, and more particularly, to implementing an integrated miniature repeater, not an IF (Intermediate Frequency) method using a SAW filter or a digital filter having a relatively large delay. By applying RF (Radio Frequency) method which can use filter with low delay, it realizes minimization of oscillation amount by delay of repeater's delay, so that the output waveform is good even with low isolation margin. The present invention relates to an all-in-one miniature repeater implemented in an RF method that enables transmission, thereby improving output gain and thus extending service range.

As is well known, oscillation of a repeater refers to a phenomenon in which a signal from a distribution antenna 1 is induced back to a donor antenna 2 as shown in FIG. 1. However, at this time, when the amount of abandonment increases, oscillation occurs and the repeater service cannot be performed.

In order to prevent the repeater oscillation, it is important to secure isolation, and there are differences depending on the repeater structure. In particular, the distance between the distribution antenna and the donor antenna of the repeater is an important factor, and the closer the distance is, the more difficult it is to secure the isolation and the more the desired gain is obtained.

Recently, miniature repeaters have been introduced, which are miniaturized and integrated into repeaters for easy installation in buildings or homes. In this case, in the case of the integrated micro repeater, since the distribution antenna and the donor antenna are structurally located in one body and the absolute position is close, it is difficult to reduce the amount of oscillation than the conventional split type repeater. Therefore, in the case of the conventional integrated miniature repeater, a technology for preventing oscillation by developing a structure to prevent isolation and adding a reflector by changing the structure or adding a feedback circuit to an internal relay circuit is being developed.

On the other hand, the above-mentioned conventional miniature integrated repeater uses an IF type repeater as shown in FIG. 2, which converts a received signal into an intermediate frequency (IF) and restores it back to the original frequency through filtering. It is a way to amplify. At this time, the filter of the conventional internal circuit of the repeater is only interested in the filtering function suitable for the other signal removal, or in the foreign country SAW filter 10 or digital filter (IF) for intermediate frequency (IF) filtering so that the frequency band can be selected 10) was used.

However, in the case of the ultra-small integrated relay, the distribution antenna and the donor antenna are attached to the relay circuit portion in the form of a patch antenna and are integrated. There is no need to use this many SAW filters or digital filters at all. Nevertheless, the conventional integrated miniature repeaters are all implemented in the IF method using a SAW filter or a digital filter. Therefore, the amount of oscillation is high due to the delay, and the output margin is deteriorated due to the high isolation margin. There was this.

Accordingly, the present invention has been made to solve the conventional problems as described above, and an object of the present invention is to implement a small repeater with a small delay, not an IF method using a SAW filter or a digital filter with a relatively large delay. By applying an RF method that can use a filter, it realizes minimization of the amount of oscillation due to the delay of the repeater, so that a good output waveform can be sent even in the absence of isolation margin, thereby improving the output gain, thereby improving the service range. The present invention provides an integrated miniature repeater implemented in an RF manner to widen.

According to another object of the present invention, the service (outgoing) antenna, the donor (receiving) antenna, and the shield box are installed inside the cover, but have an improved output gain and a good radiation pattern, and can be miniaturized and are easy to install and maintain. It is to provide an integrated micro relay device implemented in a manner.

In order to achieve the above object, the integrated miniature repeater implemented in the RF method of the present invention, in the integrated miniature repeater,

Protecting the first and second service (outgoing) antennas performing the signal transmission role, the relay circuit part performing the RF relay function, the first and second donor antennas performing the signal reception role, and the relay circuit part; At the same time, a shield box that performs a grounding role is installed in one body (cover);

The first service (outgoing) antenna and the first donor (receiving) antenna are respectively attached to opposite sides of the shield box, and the second service antenna is formed between the inner surface of the cover and the first service (outgoing) antenna. The second donor antenna is installed spaced apart from the first service (sending) antenna, wherein the second donor antenna is spaced apart from the first donor (receiving) antenna between the inner surface of the cover and the first donor (receiving) antenna. It is done.

In addition, the integrated micro relay device implemented in the RF method of the present invention, in the integrated micro relay device having a service (outgoing) antenna and a donor (receiving) antenna in one body,

A first duplex filter for separating paths of transmit and receive RF signals;

An RF transmitter for receiving a RF signal transmitted from a base station through the first duplex filter, filtering and outputting a high power amplification;

A second duplex filter for separating and outputting a path of a transmit / receive RF signal, receiving an RF signal from the RF transmitter and transmitting the received RF signal to a terminal, and transmitting the received RF signal to the receiving side; And

When the RF signal transmitted from the terminal is received through the second duplex filter, it is characterized in that it is configured with an RF receiver for high output amplification after filtering and outputting the first duplex filter.

Hereinafter, the integrated miniature relay device implemented in the RF method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, wherein the flow from the base station to the terminal is transmitted and the flow from the terminal to the base station is described. It is assumed that the reception flow.

The present invention was developed based on the fact that the numerical value related to the delay in the internal circuit of the repeater is related to the isolation margin for preventing oscillation.

The present invention focuses on the fact that the oscillation is closely related to the delay of the repeater system. When the delay time is long as shown in FIG. 3 (a), the amount of oscillation is increased by the donor antenna, and the amount of oscillation is increased. If the delay time is short as shown in (c), the amount of oscillation is reduced by the donor antenna and the amount of oscillation is reduced.

Figure 4 shows the output waveform quality value according to the delay between the antenna and the isolation margin between the repeater gain and the repeater system. In general, the serviceable quality value of CDMA is defined as a value of 0.912 or more, and FIG. 4 shows a test result of whether the quality value of the output waveform passes according to the isolation margin and the delay of the repeater system.

In general, the condition that no oscillation occurs is when the isolation margin is more than 15dB. If the repeater system's delay is 3.8 간, the repeater's antenna isolation is 75dB, and the repeater's system gain can be set to 60dB (75dB -15dB (Isolation Margin)). ), As shown in "Experimental Example 1" of FIG. In other words, the lower the waveform quality value, the higher the number of waveform peaks due to oscillation in the band.

On the other hand, as shown in Figure 4, reducing the delay of the repeater system, the number of peaks of the waveform due to the oscillation in the band is reduced, even if the well-known isolation margin value is lower, the tendency to be able to talk Seems.

In this case, the method of reducing the system delay depends on which filter is used due to the repeater characteristics. However, as described above, the SAW filter 10 or the digital filter 10 shown in FIG. 2 used in the conventional IF repeater generates a delay of about 2-4 kHz. However, as shown in FIG. 5, service antennas 110 and 120 and donor antennas 310 and 320 are attached to the relay circuit 200 in the form of patch antennas. In the case of an integrated miniature repeater in which the antennas 110 and 120, the relay circuit unit 200, and the donor (receive) antennas 310 and 320 are built into one body (shield box) 400, interference cancellation between the other companies Since at least they are not subject to radio inspection, they have excellent interference rejection, but there is no need to use a SAW filter with many delay components.

Integrated miniature relay device implemented in the RF method according to an embodiment of the present invention, as shown in Figure 5, the first and second service (sending) antenna (Service Antenna) 110, 120, relay circuit unit 200, The first and second donor (receive) antennas 310 and 320 and the shield box 400 have a structure installed inside the cover 500.

The first service (outgoing) antenna 110 and the first donor (receiving) antenna 310 are respectively formed on the substrates 111 and 311 and radiating elements 112 and 312 on one surface of the substrates 111 and 311. ) And feed lines 113 and 313. In this case, each of the radiating elements 112 and 312 may have a patch form formed on the substrates 111 and 311 by an etching method.

In addition, since the first service (outgoing) antenna 110 and the first donor (receiving) antenna 310 may be spaced apart from the shield box 400, resonance may occur, so that the shield box 400 It is attached to the opposite side of each.

Meanwhile, the second service antenna 120 and the second donor antenna 320 have substrates 121 and 321 and parasitic elements 122 and 322 formed on one surface of the substrates 121 and 321, respectively. In this case, each of the parasitic elements 122 and 322 may be in the form of a patch formed on the substrate 121, 321 by an etching method.

In addition, the parasitic elements 122 and 322 are positioned to correspond to the radiating elements 112 and 312 formed on the first service (outgoing) antenna 110 and the first donor (receiving) antenna 310. .

On the other hand, the second service antenna 120 and the second donor antenna 320 affects the VSWR (voltage standing wave ratio) of the miniature integrated repeater, and can have a good radiation pattern.

In addition, the shield box 400 protects the internal relay circuit 200 and radiates 112 and 312 formed in the first service (outgoing) antenna 110 and the first donor (receiving) antenna 310. ) And the power supply lines 113 and 313 to serve as ground planes, and radiating elements 112 and 312 formed on the first service (outgoing) antenna 110 and the first donor (receiving) antenna 310. By preventing the organic phenomenon of the signal between the first service (outgoing) antenna 110 and the first donor (receiving) antenna 310 by having a wider surface, the micro-integrated relay device has improved isolation characteristics and outputs. You can increase the gain.

On the other hand, the cover 500 is made of acryl (acryl) material similar to the dielectric constant of air so as to pass the transmitted / received signal well, can be formed in various forms in consideration of the aesthetics, and to be protected to the outside .

Preferably, the integrated micro repeater is spaced apart from the first service (sending) antenna 110 between the inner surface of the cover 500 and the first service (sending) antenna 110 so that the second service antenna 120 is separated. The second donor antenna 320 is installed between the inner surface of the cover 500 and the first donor (receive) antenna 310 and spaced apart from the first donor (receive) antenna 310.

Hereinafter, the results of testing the integrated micro relay apparatus configured as shown in FIG. 5 by dividing into [Comparative Example] and [Example] will be described with reference to FIG. 6.

[Comparative Example]

FIG. 6 (a) shows a case in which the size of a shield box is 200 × 250 * 60 (W * H * D) mm in the form of a conventional integrated micro repeater, and a SAW filter (delay 2Hz) is used. In this case, the maximum possible isolation between antennas in the field is about 65-70dB, and the maximum gain is about 50dB.

[Example]

As shown in FIG. 6 (b), the size of the shield box is 160 * 200 * 60 (W * H * D) mm for the integrated miniature repeater, and the low delay type and the DR filter (delay 0.7㎲) ), The maximum gain is more than 55dB, which gives higher gain than using a smaller, longer delay filter.

The above test results can also be described as a table of FIG. In the case of [Comparative Example], the isolation margin in the repeater system delay 2 같이 should be 15dB (i.e., Isolation: 65dB, gain: 50dB) in the isolation of 65-70dB. It can satisfy 0.912 or more, which is the quality standard of waveform.

In the case of the above-described embodiment, the isolation margin at the repeater system delay of 0.7 Hz is 8 dB (i.e., Isolation: 65 dB, gain: 55 dB) in the isolation of 65-70 dB. The service can be serviced without oscillation because it satisfies the quality specification of 0.912 or higher.

FIG. 7 is a functional block diagram of the relay circuit unit 200 of the integrated miniature relay device implemented in the RF method according to an embodiment of the present invention, which is the first service (sending) antenna 110 shown in FIG. Radiating elements 112 and 312 respectively formed on the first donor (receive) antenna 310 are electrically connected to the relay circuit unit 200 and the feed lines 113 and 313 inside the shield box 400.

In this case, as illustrated in FIG. 7, the relay circuit 200 includes a first duplex filter 210, an RF transmitter 220, a second duplex filter 230, and an RF receiver 240. have.

The first duplex filter 210 separates the RF signal received from the base station into the RF transmitter 220 or transmits the RF signal received from the RF receiver 240 to the base station through an antenna.

In addition, when the RF transmitter 220 receives an RF signal from the first duplex filter 210, the RF transmitter 220 performs a high output amplification after filtering the RF signal and outputs the amplified signal to the second duplex filter 210.

In this case, the RF transmitter 220 may include a first low noise amplifier (LNA) for minimizing and amplifying noise when the RF signal is input from the first duplex filter 210 and the first low noise amplifier (LNA); A first band pass filter (BPF) 222 that receives an RF signal from the second band filter 221 and performs a filtering function, and outputs an RF signal filtered through the first band pass filter 222; A first driving amplifier (223) for receiving and amplifying and outputting the first driving amplifier (223) for outputting the RF signal amplified by the first driving amplifier (223) to the second duplex filter (230) after high output amplification; And a high power amplifier (HPA) 224. Here, the first bandpass filter 222 may be implemented by using a DR (Dielectronic Resonator) filter having a delay of about 0.7 dB or less. Any filter with a delay It is applicable.

Meanwhile, the second duplex filter 230 separates and outputs a path of the transmit / receive RF signal, receives the RF signal from the RF transmitter 220 and transmits the RF signal to the terminal, and receives the RF signal from the terminal. It serves to transfer to the RF receiver 240.

In addition, when the RF receiver 240 receives the RF signal transmitted from the terminal through the second duplex filter 230, the RF receiver 240 filters and then amplifies and outputs the RF signal to the first duplex filter 210. .

In this case, the RF receiver 240 includes a second low noise amplifier 241 which minimizes and amplifies noise when the RF signal is input from the second duplex filter 230; A second band pass filter 242 which receives an RF signal from the second low noise amplifier 241 and performs a filtering function; A second driving amplifier 243 for receiving an amplified RF signal filtered through the second band pass filter 242 and amplifying and outputting the RF signal; And a second high output amplifier 244 that high output amplifies the RF signal amplified by the second driving amplifier 243 and then outputs the RF signal amplified by the first duplex filter 210. Here, the second bandpass filter 242 may be implemented using a DR (Dielectronic Resonator) filter having a delay of about 0.7 dB or less, and any filter may be applied as long as the filter has a low delay.

Next, an operation process of the integrated micro relay device implemented by the RF method according to the exemplary embodiment of the present invention having the above configuration will be described with reference to FIG. 7.

First, the transmission process from the base station to the terminal, the first duplex filter 210 receives the RF signal from the base station and outputs it to the first low noise amplifier 221 of the RF transmitter 220.

Then, the first low noise amplifier 221 receives the RF signal from the first duplex filter 210 to minimize the noise and then amplify and output the RF signal to the first bandpass filter 222.

The first bandpass filter 222 receives an RF signal from the first low noise amplifier 221 and performs a filtering function and then outputs the RF signal to the first driving amplifier 223.

Then, the first driving amplifier 223 receives and amplifies the RF signal filtered through the first bandpass filter 222 and outputs the amplified RF signal to the first high output amplifier 224.

In addition, the first high output amplifier 224 high output amplifies the RF signal amplified by the first driving amplifier 223 and outputs the second duplex filter 230.

Then, the second duplex filter 230 receives an RF signal from the first high output amplifier 224 of the RF transmitter 220 and transmits the RF signal to the terminal.

Meanwhile, the reception process from the terminal to the base station will be described below.

First, the second duplex filter 230 receives an RF signal from a terminal and outputs the RF signal to the second low noise amplifier 241 of the RF receiver 240.

Then, the second low noise amplifier 241 receives the RF signal from the second duplex filter 230 to minimize the noise and then amplify and output the RF signal to the second band pass filter 242.

The second bandpass filter 242 receives an RF signal from the second low noise amplifier 241, performs a filtering function, and outputs the RF signal to the second driving amplifier 243.

Then, the second driving amplifier 243 receives and amplifies the RF signal filtered through the second bandpass filter 242 and outputs the amplified RF signal to the second high output amplifier 244.

In addition, the second high output amplifier 244 high output amplifies the RF signal amplified by the second driving amplifier 243 and outputs the first duplex filter 210.

Then, the first duplex filter 210 receives the RF signal from the second high output amplifier 244 of the RF receiver 240 and transmits the RF signal to the base station.

Although the present invention has been described in more detail with reference to several embodiments, the present invention is not necessarily limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention. .

As described above, according to the integrated miniature repeater implemented by the RF method according to the present invention, in implementing the integrated miniature repeater, the use of a filter having a small delay, rather than an IF method using a SAW filter or a digital filter with a relatively large delay, By applying possible RF method, it realizes minimization of oscillation amount by repeater's delay reduction, so that good output waveform can be sent even with low isolation margin, which improves the output gain and widens the service range accordingly. It works.

According to the present invention, the service (outgoing) antenna, the donor (receiving) antenna, and the shield box are installed inside the cover, but also have an improved output gain and a good radiation pattern, and can be downsized, and are easy to install and maintain. There is.

Claims (21)

In the integrated micro relay device, Protecting the first and second service (outgoing) antennas performing the signal transmission role, the relay circuit part performing the RF relay function, the first and second donor antennas performing the signal reception role, and the relay circuit part; At the same time, a shield box that performs a grounding role is installed in one body (cover); The first service (outgoing) antenna and the first donor (receiving) antenna are respectively attached to opposite sides of the shield box, and the second service antenna is formed between the inner surface of the cover and the first service (outgoing) antenna. The second donor antenna is installed spaced apart from the first service (sending) antenna, wherein the second donor antenna is spaced apart from the first donor (receiving) antenna between the inner surface of the cover and the first donor (receiving) antenna. Integrated miniature repeater implemented by the RF method. The method of claim 1, The relay circuit unit may include: a first duplex filter separating a path of a transmit / receive RF signal; An RF transmitter for receiving a RF signal transmitted from a base station through the first duplex filter, filtering and outputting a high power amplification; A second duplex filter for separating and outputting a path of a transmit / receive RF signal, receiving an RF signal from the RF transmitter and transmitting the received RF signal to a terminal, and transmitting the received RF signal to the receiving side; And When the RF signal transmitted from the terminal is received through the second duplex filter, the integrated ultra-compact repeater implemented by the RF method, characterized in that the RF receiver configured to filter and then output a high output to the first duplex filter. 3. The method of claim 2, The RF transmitter may include: a first low noise amplifier configured to minimize and amplify noise when receiving an RF signal from the first duplex filter; A first bandpass filter receiving an RF signal from the first low noise amplifier and performing a filtering function; A first driving amplifier receiving the amplified RF signal through the first bandpass filter and amplifying and outputting the RF signal; And And a first high power amplifier configured to output a high power amplified RF signal amplified by the first driving amplifier and output to the second duplex filter. The method of claim 3, The first bandpass filter is integrated miniature repeater implemented in the RF method, characterized in that implemented using a DR (Dielectronic Resonator) filter having a delay of 0.7㎲ or less. 3. The method of claim 2, The RF receiver may include: a second low noise amplifier configured to minimize and amplify noise when the RF signal is input from the second duplex filter; A second bandpass filter configured to receive an RF signal from the second low noise amplifier and perform a filtering function; A second driving amplifier receiving and amplifying and outputting the RF signal filtered through the second bandpass filter; And And a second high output amplifier configured to high output amplify the RF signal amplified by the second driving amplifier and output the amplified RF signal to the first duplex filter. 6. The method of claim 5, The second bandpass filter is a one-piece miniature repeater implemented in the RF method, characterized in that implemented using a DR (Dielectronic Resonator) filter having a delay of 0.7㎲ or less. The method of claim 1, The first service (sending) antenna may include a substrate; And An integrated micro relay device, which is electrically connected to the relay circuit unit, and implemented by an RF method, comprising a radiating element and a feeding line formed on one surface of the substrate. 8. The method of claim 7, The radiating element is an integrated micro relay device implemented in the RF method, characterized in that the patch form formed on the substrate by an etching method. The method of claim 1, The first donor (receive) antenna includes a substrate; And An integrated micro relay device, which is electrically connected to the relay circuit unit and implemented by an RF method, comprising a radiating element and a feeding line formed on one surface of the substrate. 10. The method of claim 9, The radiating element is an integrated micro relay device implemented in the RF method, characterized in that the patch form formed on the substrate by an etching method. The method of claim 1, The second service antenna includes a substrate; And Integrated micro relay device implemented in the RF method, characterized in that it comprises a parasitic element installed on one side of the substrate. 12. The method of claim 11, The parasitic element is an integrated micro relay device implemented in the RF method, characterized in that the patch form formed by the etching method on the substrate. The method of claim 1, The second donor (receive) antenna includes a substrate; And Integrated micro relay device implemented in the RF method, characterized in that it comprises a parasitic element installed on one side of the substrate. 14. The method of claim 13, The parasitic element is an integrated micro relay device implemented in the RF method, characterized in that the patch form formed by the etching method on the substrate. The method of claim 1, The cover is an integrated micro relay device implemented in the RF method, characterized in that formed of acrylic (acryl) material. The method of claim 1, Integrated miniature repeater implemented in the RF method, characterized in that the use of different polarization between the donor antenna and the service antenna. In the integrated miniature repeater having a service (outgoing) antenna and a donor (receiving) antenna in one body, A first duplex filter for separating paths of transmit and receive RF signals; An RF transmitter for receiving a RF signal transmitted from a base station through the first duplex filter, filtering and outputting a high power amplification; A second duplex filter for separating and outputting a path of a transmit / receive RF signal, receiving an RF signal from the RF transmitter and transmitting the received RF signal to a terminal, and transmitting the received RF signal to the receiving side; And When the RF signal transmitted from the terminal is received through the second duplex filter, the RF receiver for filtering and outputting the high power amplification to the first duplex filter To include, the RF transmitter, A first low noise amplifier configured to minimize and amplify noise when the RF signal is input from the first duplex filter; A first bandpass filter receiving an RF signal from the first low noise amplifier and performing a filtering function; A first driving amplifier receiving the amplified RF signal through the first bandpass filter and amplifying and outputting the RF signal; And A first high power amplifier for high output amplifying the RF signal amplified by the first driving amplifier and then output to the second duplex filter Integrated miniature repeater implemented in the RF method comprising a. delete 18. The method of claim 17, The first bandpass filter is integrated miniature repeater implemented in the RF method, characterized in that implemented using a DR (Dielectronic Resonator) filter having a delay of 0.7㎲ or less. 18. The method of claim 17, The RF receiver may include: a second low noise amplifier configured to minimize and amplify noise when the RF signal is input from the second duplex filter; A second bandpass filter configured to receive an RF signal from the second low noise amplifier and perform a filtering function; A second driving amplifier receiving and amplifying and outputting the RF signal filtered through the second bandpass filter; And And a second high output amplifier configured to high output amplify the RF signal amplified by the second driving amplifier and output the amplified RF signal to the first duplex filter. 21. The method of claim 20, The second bandpass filter is a one-piece miniature repeater implemented in the RF method, characterized in that implemented using a DR (Dielectronic Resonator) filter having a delay of 0.7㎲ or less.

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