KR20080079357A - Self-Diplexing Antenna with Improved Transceiver Separation and Antenna Isolation - Google Patents

Abstract

The present invention relates to an antenna and a repeater using the same, and more particularly, to improve orthogonal polarization characteristics and separation characteristics of a transmission and reception path by arranging a plurality of radiating elements to be orthogonal to each other and passing a 180 degree power divider and a synthesizer. At the same time, these two antennas are placed at right angles so as to have orthogonal wave characteristics on both sides of the equilateral sides of the rectangular parallelepiped, and each of them is used as a donor antenna and a service antenna to improve antenna isolation characteristics. By placing the structures on the opposite side separated from the antenna plane by the ground plane, the transmit / receive separation and antenna isolation characteristics are deteriorated due to the mutual coupling that can occur when the structure is placed on the same plane as the antenna without affecting the antenna's unique pattern. Transmit / receive separation and antenna isolation The present invention relates to an improved self diplexing antenna and a micro repeater using the same.

By using the antenna system according to the present invention, it is possible to implement a repeater having a very small structure suitable for portable or home, but also having high transmit / receive separation and antenna isolation characteristics. Therefore, when the transmit / receive separation method is a frequency division method (FDD), a high transmit / receive separation characteristic can be obtained by improving the frequency selectivity characteristic, and an expensive duplexer is unnecessary, and even when the time division method (TDD) is a high transmit / receive separation property. This eliminates the need for expensive transmit / receive RF switches. In addition, since a single antenna for both transmission and reception can be disposed at a short distance, miniaturization is easy because the distance between the donor antenna and the service antenna can be minimized.

Description

Self-diplexing antenna for improved TX / Rx and antenna isolation

1 is a view showing the structure of a miniature repeater using a self-diplexing antenna according to the present invention.

Figure 2 is a block diagram showing the configuration of a miniature repeater using a self-diplexing antenna according to the present invention.

3 is a view showing a structure of a self-diplexing antenna according to the present invention.

4 illustrates the structure of a 180 degree power divider in accordance with the present invention.

5 is a view showing the structure of the line for improving the isolation between terminals of the 180-degree power divider according to the present invention.

Figure 6 is an assembly diagram of a micro repeater using a self-diplexing antenna according to the present invention.

7 is a view showing the assembly state of the micro repeater using a self-diplexing antenna according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10: base station 20: user

100: repeater 101: housing

102: part side of the housing 110: amplification part

111: downlink amplifier 112: uplink amplifier

210: donor antenna portion 211: donor antenna first radiation element

212: donor antenna second radiation element 213: donor antenna third radiation element

214: donor antenna fourth radiation element 215: donor antenna portion ground plane

220: donor power distribution / synthesis unit 221: donor 180 degrees power synthesizer

221-1: first input terminal 221-2: second input terminal

221-3: Output terminal 222-1: Input terminal

222-2: first output terminal 222-3: second output terminal

222: 180 degrees donor power divider 310: service antenna unit

311: service antenna first radiating element 312: service antenna second radiating element

313: service antenna third radiation element 314: service antenna fourth radiation element

315: ground plane service antenna 320: service power distribution / synthesis section

321: Service 180 Degree Power Divider 322: Service 180 Degree Power Synthesizer

401: metal plate 402: strip line

403: dielectric 404: metal piece

405: Metal Pin 405: Groove

The present invention relates to an antenna and a repeater using the same. More particularly, a plurality of radiating elements are arranged to be orthogonal to each other, and a 180 degree power divider and a synthesizer pass through a transmission / reception path using an orthogonal polarization and a 180 degree power divider / synthesizer. It is also possible to improve the separation of the antenna and improve the antenna isolation characteristics by arranging the donor antenna and the service antenna on both sides of the back-to-back of the rectangular parallelepiped and orthogonally polarizing the donor antenna and the service antenna. The present invention relates to a self-diplexing antenna having improved transmit / receive separation and antenna isolation characteristics and a miniature repeater using the same.

In general, in order to provide voice-oriented mobile communication such as cellular and PCS and mobile Internet (WiBro) service for mobile high-speed data communication, base stations should be installed by proper cell arrangement. Repeater must be installed. In particular, in order to eliminate small shadow areas such as offices or homes and underground spaces, it is desirable to install low-cost fixed or portable micro repeaters in place of large and expensive large repeaters.

In order to expand the coverage of such a small / miniature repeater, it is necessary to increase the gain of the repeater. In this case, it is necessary to prevent oscillation of the amplifier inside the repeater. To this end, it is necessary to secure isolation between the donor antenna and the service antenna, and it is generally designed to satisfy the following Equation 1.

Antenna Isolation [dB]> Antenna Gain [dB] + 15 [dB]

In addition, conventional miniature repeaters have a structure in which a donor antenna and a service antenna are configured using a single antenna to serve as a transmission and reception, and a duplexer or an RF switch is used to secure separation of transmission and reception paths. In particular, in the time division method, an expensive synchronization detection unit for analyzing transmission and reception synchronization signals is further required for normal operation of the transmission and reception separation switch.

To solve this problem, a method of using two separate transmit and receive antennas instead of a single transmit / receive antenna has been proposed. In the case of the small / mini repeater using a single antenna for transmitting / receiving, the circuit is complicated and expensive, whereas in the case of using two separate transmit / receive antennas, the installation space is increased according to the increase of the antenna arrangement space. It is also necessary and difficult to obtain high transmit / receive isolation.

On the other hand, conventional large repeaters have a method of sufficiently separating the distance between the donor antenna and the service antenna to secure high antenna isolation, a method of shielding the donor antenna and the service antenna, and a circuit for removing interference inside the repeater ( Methods of adding an Interference Cancellation System (ICS) are selectively used. However, these methods cannot be used to implement low-cost miniature repeaters, and in particular, the method using ICS requires a complicated circuit configuration and algorithm, which greatly increases the repeater manufacturing cost.

The present invention is to solve the problems of the prior art as described above, by applying a circuit and structure that can improve the transmission and reception separation and antenna isolation characteristics, can be applied to a small and low-cost portable or indoor small / ultra small repeater antenna Implementing the system is a technical task.

In order to solve the above problems, the present invention provides a repeater for retransmitting a radio signal, the first to fourth radiating element or the like to receive the downlink high frequency signal from the base station or repeater and to transmit the uplink high frequency signal from the terminal; A donor antenna unit 210 formed of a terminal; A donor power distribution / synthesis unit (220) for making the downlink high frequency signal received from the donor antenna unit and the uplink high frequency signal transmitted to the donor antenna unit into two signals of equal magnitude each having a 180 degree phase difference; An amplifying unit (110) for amplifying a downlink high frequency signal received from the donor power distribution / synthesizing unit and an uplink high frequency signal transmitted to the donor power distribution / synthesizing unit with a predetermined gain; A service power distribution / compositing unit (320) for making the downlink high frequency signal received from the amplifying unit and the uplink high frequency signal transmitted to the amplifying unit into two signals having the same magnitude each having a 180 degree phase difference; And a service antenna 310 comprising first to fourth radiating elements or terminals for receiving an uplink high frequency signal from a terminal and for transmitting a downlink high frequency signal from a base station or a repeater.

The donor antenna 210 includes donor antennas 1 and 2 radiating elements 211 and 212 for receiving downlink high frequency signals from a base station or repeater, respectively, and donor for transmitting uplink high frequency signals from a terminal, respectively. The antenna consists of third and fourth radiators 213 and 214.

The donor power distribution / combining unit 220 includes: a donor power synthesizer 221 for synthesizing downlink high frequency signals received from donor antenna first and second radiation elements of the donor antenna unit to have a 180 degree phase difference, and the donor antenna And a donor power divider 222 for distributing uplink high frequency signals transmitted to the negative donor antenna third and fourth radiation elements to have a 180 degree phase difference.

The amplification unit 110 transmits the downlink high-frequency signal received from the donor power synthesizer of the donor power distribution / synthesis unit to a predetermined gain and a donor power divider of the donor power distribution / synthesis unit. And an uplink amplifier 112 that amplifies the uplink high frequency signal to a predetermined gain.

The service power divider / combiner 320 may include a service power divider 321 for distributing downlink high frequency signals received from the downlink amplifier of the amplifier to have a phase difference of 180 degrees, and an uplink amplifier transmitted to the uplink amplifier of the amplifier. And a service power synthesizer 322 for synthesizing the link high frequency signal to have a 180 degree phase difference.

The service antenna unit 310, the service antenna third and fourth radiating elements (313, 314) for receiving the uplink high-frequency signals from the terminal, respectively, and the service for transmitting downlink high-frequency signals from the base station or repeater, respectively The antenna comprises first and second radiating elements 311 and 312.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding members will be denoted by the same reference numerals and detailed description thereof will be omitted.

1 is a view showing the structure of a miniature repeater using a self-diplexing antenna according to the present invention. As shown in (a) of FIG. 1, the donor antenna unit 210 mounted on the front portion of the portable, indoor small repeater 100 according to the present invention and the rear portion of the repeater as shown in FIG. Transmitted and received service antenna unit 310 is provided in the back-to-back structure orthogonal to each other in order to have orthogonal polarization characteristics to ensure high isolation. In addition, the donor antenna portion 210 of the front and the service antenna portion 310 of the rear has a donor power distribution / synthesis unit 220 and a service power distribution / synthesis unit 320 opposite to each ground plane (215,315) The amplification unit 110 is mounted between the other ground planes that shield the structures, and the assembled components are housed in the housing 101. In FIG. 1, a part 102 of the housing is separated to show a part of the inside of the repeater.

Fig. 2 is a block diagram showing the configuration of a micro repeater. As shown in Figure 2 looks at the operating principle of the antenna system and the repeater of the present invention. First, in case of a downlink signal transmitted from a base station or a neighboring repeater, the donor antenna first and second radiation elements 211 and 212 of the donor antenna unit 210 are received, respectively, and then the donor power distribution / combining unit 220. The donor power synthesizer 221 is synthesized to have a phase difference of 180 degrees. That is, referring to FIG. 2, the signal received by the donor antenna first radiating element 211 has a phase of 0 degrees, and the signal received by the donor antenna second radiating element 212 has a phase of 180 degrees. 221).

Subsequently, the signal output from the donor power synthesizer 221 is amplified to a predetermined gain by the downlink amplifier 111 of the amplifying unit 110, and then, by the service power divider 321 of the service power distribution / synthesizing unit 320. It is distributed to have a phase difference of 180 degrees and then applied to the service antenna first and second radiating elements 311 and 312 of the service antenna unit 310, respectively, in phase and are transmitted to the terminal of the shaded area.

In contrast, the uplink signal transmitted from the terminal undergoes the same process by the reverse path as described above. That is, after the service antenna third and fourth radiating elements 313 and 314 of the service antenna unit 310 respectively receive the uplink signal, the service power synthesizer 322 of the service power distribution / compositing unit 320 receives 180 uplink signals. In this case, the signal received by the service antenna third radiating element 313 is 180 degrees in phase, and the signal received by the service antenna fourth radiating element 314 is phased. This zero degree is synthesized in the service power synthesizer 322.

The signal output from the service power synthesizer 322 is amplified by a predetermined gain by the uplink amplifier 112 of the amplifier 110 and by the donor power divider 222 of the donor power divider / combiner 220. They are distributed so as to have a phase difference of 180 degrees and then applied to donor antenna third and fourth radiation elements 213 and 214 of donor antenna unit 210, respectively, added in phase and transmitted to the base station or repeater.

At this time, the uplink signal transmitted by the donor antenna third and fourth radiation elements 213 and 214 of the donor antenna portion 210 and the service antenna third and fourth radiation elements 313 and the service antenna portion 310 of the donor antenna portion 210. Since the uplink signals received by 314 have mutually orthogonal polarization characteristics, high antenna isolation characteristics are obtained. This principle is based on the first and second radiating elements 311 and 312 of the service antennas 310 of the service antenna unit 310. The same applies to the donor antenna first and second radiation elements 211 and 212 of the donor antenna unit 210.

In addition, the donor antenna first and second radiating elements 211 and 212 for downlink reception and the donor antenna third and fourth radiating elements 213 and 214 for uplink transmission are mutually performed in the donor antenna unit 210. Because of the orthogonal polarization, a high transmit / receive separation characteristic is obtained, and this principle is performed by the service antenna 310 to service the first and second radiating elements 311 and 312 for downlink transmission and the service for uplink reception. The same applies to the antenna third and fourth radiation elements 313 and 314.

The structure of the donor antenna and the service antenna as described above can be made through the four radiating elements of the quadruple feed single antenna or single feed structure, respectively, in the case of a quadruple feed single antenna has the advantage that the size is reduced On the other hand, in the case of using four radiating elements of a single feeding structure, there is an advantage that the mutual coupling between the feeding points is very small, allowing independent design. At this time, in both cases, the four feed points are paired by two to be divided into a transmitting side and a receiving side, and each of them is fed through a 180 degree power distributor. Through this, the radiating element for transmitting and the radiating element for receiving have mutually orthogonal polarization. Due to the propagation characteristics of actual mobile communication, the transmitting polarization and receiving polarization of the antenna are implemented in 0 degrees, 90 degrees, or +45 degrees and -45 degrees directions, respectively. This is valid. In this way, high transmit / receive separation and antenna isolation characteristics can be obtained.

Applying this antenna system to the time-division method (TDD) enables the same feeder circuit to be used, which simplifies the circuit structure and provides high transmit / receive separation characteristics, thereby eliminating the need for expensive high-power RF switches. There is this. In addition, when applied to the frequency division scheme (FDD), since the transmit and receive frequencies are different, different feeder circuits optimized for each frequency characteristic are required, and the antenna uses a single antenna having a wideband characteristic capable of processing transmission and reception bands, Alternatively, two narrowband antennas optimized for transmission and reception may be used. In particular, when each antenna optimized for transmission and reception frequency is used in the frequency division method, narrow frequency characteristics are allowed in each channel, thereby minimizing the antenna size problem required for a single wide bandwidth characteristic. Advantageously, high transmit / receive separation characteristics can be obtained, which makes an expensive duplexer unnecessary.

3 is a view showing the structure of a self-diplexing antenna according to the present invention. As shown in FIG. 3, a transmission or reception antenna having desired characteristics may be implemented by using a single antenna or four antenna arrangements having various structures.

3 (a) to (d) show the structure of four single feed antennas, there is an advantage that the mutual coupling between the feed points is very small and independent design is possible. As illustrated, four single feed antennas are formed to be symmetrical with respect to the center point, and elements facing each other transmit or receive the same signal.

3 (e) to (h) show the structure of a quadruple fed single antenna, it has the advantage that the size of the entire antenna is small, it is easy to implement the miniaturization. Also in this case, the four feed points are formed to be symmetrical with respect to the center point.

4 is a view showing the structure of a 180-degree power divider according to the present invention. In the present invention, since the power divider and the synthesizer have the same structure in which reversible theorem is established, and the configurations of the donor power distribution / synthesis unit and the service power distribution / synthesis unit are also the same, only the donor power distribution / synthesis unit 220 will be described in FIG. 4. .

As shown in FIG. 4, the donor power divider 222 and the donor power synthesizer 221 are formed on one circuit board, and the feed point of each antenna is provided at an input terminal 222-1, which is a signal feeding point of transmission and reception. The phase difference between the first and second output terminals 222-2 and 222-3 should be 180 degrees. Similarly, the phase difference between the first and second input terminals 221-1 and 221-2 in the output terminal 221-3 should be 180 degrees. As a method for implementing this, any one of a T-network and a 180-degree transmission line structure, a Wilkinson power divider and a 180-degree transmission line structure, or Magic-T may be selected and used according to each situation. .

5 is a view showing the structure of the line for improving the isolation between terminals of the 180-degree power divider according to the present invention. In general, when a feed circuit composed of 180-degree power dividers required for signal transmission to an antenna is disposed in the same direction as the antenna plane, unwanted interconnection between terminals may occur in the process of implementing the 180-degree power divider / synthesizer of FIG. 4. Due to this, the necessary transmit / receive separation and antenna isolation characteristics may not be obtained. Also, even when the antenna and the feeder circuit are arranged on the opposite side of the ground plane, if the feeder circuit is implemented on the same side of the microstrip, the characteristics of transmit / receive separation and antenna isolation due to coupling by surface wave transmission and unnecessary radiation by dielectric As this can be degraded, it is necessary to reduce or completely block these unwanted electromagnetic coupling effects.

To this end, the present invention used the embodiments as shown in Figure 5 (a) to (d). FIG. 5A illustrates a structure in which a groove having a predetermined width is formed in a metal plate 401 having a predetermined thickness and a stripline 402 is inserted. FIG. 5B illustrates a structure of FIG. 5A. As a result, the upper surface of the metal piece 404 is covered. At this time, the metal piece 404 and the metal plate 401 having a predetermined thickness that cover the upper surface may be further separated from each other by using different materials to reduce unwanted electromagnetic coupling effects. 5C is a structure in which a metal piece is provided around the stripline 402 and a ground plane and a via-hole are formed by using the metal pin 405, and FIG. Is a structure that forms a periodic groove 405 around the dielectric 403.

6 and 7 are views showing the assembling and assembling state of the micro repeater using the self-diplexing antenna according to the present invention, respectively, a design structure considering the convenience of manufacturing and maintenance. As shown, the donor antenna unit 210, the service antenna unit 310, the donor power distribution / synthesis unit 220, the service power distribution / synthesis unit 320, and the amplification unit 110 are manufactured, respectively. It can be implemented by connecting by coaxial cable and fixing each other by precisely matching each position using guide pins. In this case, as well as the convenience of manufacturing, in case of a failure, the connection can be dismantled and only necessary parts can be repaired.

Although the present invention as described above has been described with respect to the preferred embodiment, the present invention is not limited thereto, and various modifications and changes may be made without departing from the technical spirit of the present invention.

As described above, the present invention can implement an antenna system having high transmit / receive separation and antenna isolation characteristics without any complicated circuits, and by using it, it is possible to implement a low cost small / small repeater, thereby improving the problems of the prior art. have.

In other words, it is possible to solve the problem that an expensive complex duplexer, an RF switch, or a synchronous detection circuit used to separate a transmission / reception path when transmitting / receiving with a single antenna to improve transmission / reception separation can be solved. In this case, it was difficult to implement a repeater with a small / miniature structure because a large space was needed to secure transmission and reception separation and antenna isolation. In addition, when ICS is used inside the repeater, a separate synchronous detection and control circuit is required and complicated. It is not only able to solve the problems of economic efficiency and miniaturization due to the algorithm implementation, but also has an effect of having a structure that is easy to manufacture and maintain.

Claims (25)

In a repeater for retransmitting a radio signal, A donor antenna unit comprising first to fourth radiating elements for receiving downlink high frequency signals from a base station or repeater and transmitting uplink high frequency signals from a terminal; A donor power distribution / synthesizing unit for converting the downlink high frequency signal received from the donor antenna unit and the uplink high frequency signal transmitted to the donor antenna unit into two signals of equal magnitude each having a 180 degree phase difference; An amplifier for amplifying a downlink high frequency signal received from the donor power divider / synthesizer and an uplink high frequency signal transmitted to the donor power divider / synthesizer with a predetermined gain; A service power distribution / synthesis unit for generating a downlink high frequency signal received from the amplifying unit and an uplink high frequency signal transmitted to the amplifying unit into two signals of equal magnitude each having a 180 degree phase difference; Self-receiving and improving antenna isolation characteristics including; service antenna unit consisting of the first to fourth radiation elements for receiving the uplink high-frequency signal from the terminal and transmitting the downlink high-frequency signal from the base station or repeater Diplexing antenna and micro repeater using the same. The method of claim 1, wherein the donor antenna unit, Donor antenna first and second radiating elements for receiving downlink high frequency signals from a base station or repeater, respectively; A self-diplexing antenna having improved transmit / receive separation and antenna isolation characteristics, comprising a donor antenna third and fourth radiating elements for transmitting uplink high frequency signals from a terminal, respectively. The method of claim 1, wherein the donor power distribution / synthesis unit, A donor power synthesizer for synthesizing downlink high frequency signals received from donor antenna first and second radiation elements of the donor antenna unit to have a 180 degree phase difference; Self-die with improved transmit / receive separation and antenna isolation characteristics, characterized in that it comprises a donor power divider for distributing uplink high-frequency signals transmitted to the donor antenna third and fourth radiation elements having a 180 degree phase difference. A flexing antenna and a micro repeater using the same. The method of claim 1, wherein the amplifying unit, A downlink amplifier for amplifying a downlink high frequency signal received from a donor power synthesizer of the donor power distribution / synthesis unit with a predetermined gain; Self-diplexing antenna with improved transmit / receive separation and antenna isolation characteristics, characterized in that the uplink amplifier for amplifying the uplink high-frequency signal transmitted to the donor power divider of the donor power distribution / synthesis unit with a predetermined gain, and Miniature repeater used. The method of claim 1, wherein the service power distribution / synthesis unit, A service power divider for distributing a downlink high frequency signal received from the downlink amplifier of the amplifier to have a phase difference of 180 degrees; Self-diplexing antenna with improved transmit / receive separation and antenna isolation characteristics, characterized in that it comprises a service power synthesizer for synthesizing the uplink high-frequency signal transmitted to the uplink amplifier of the amplifier to have a 180 degree phase difference Repeater. The method of claim 1, wherein the service antenna unit, A service antenna third and fourth radiation elements for receiving an uplink high frequency signal from a terminal, respectively; A self-diplexing antenna with improved transmit / receive separation and antenna isolation characteristics, characterized in that it comprises a service antenna first and second radiating elements for transmitting downlink high-frequency signals from a base station or repeater, respectively. The donor antenna unit of claim 1 or 2, The quadruple feed single antenna structure has a symmetrical structure with respect to the center point, and the four feed points are paired into two and divided into a transmitting side and a receiving side. A self-diplexing antenna having improved transmit / receive separation and antenna isolation characteristics, wherein the radiating elements have mutually orthogonal polarization, and a repeater using the same. The donor antenna unit of claim 1 or 2, An antenna having four radiating elements of a single feeding structure, four radiating elements are paired into two and divided into a transmitting side and a receiving side, and each of them is fed through a 180-degree power divider to radiate for transmitting and radiating for receiving. A self-diplexing antenna having improved transmit / receive separation and antenna isolation characteristics, wherein the devices have mutually orthogonal polarization, and a repeater using the same. The method of claim 1, wherein the service antenna unit, The quadruple feed single antenna structure is symmetrical with respect to the center point. The four feed points are paired into two and divided into a transmitting side and a receiving side. A self-diplexing antenna having improved transmit / receive separation and antenna isolation characteristics, wherein the radiating elements have mutually orthogonal polarization, and a repeater using the same. The method of claim 1, wherein the service antenna unit, An antenna having four radiating elements of a single feeding structure, four radiating elements are paired into two and divided into a transmitting side and a receiving side, and each of them is fed through a 180-degree power divider to radiate for transmitting and radiating for receiving. A self-diplexing antenna having improved transmit / receive separation and antenna isolation characteristics, wherein the devices have mutually orthogonal polarization, and a repeater using the same. The method of claim 3, wherein the donor power divider, A self-diplexing antenna having improved transmit / receive separation and antenna isolation characteristics, characterized in that the input terminal has a phase difference of 180 degrees between the first and second output terminals, and a miniature repeater using the same. The donor power synthesizer of claim 3, wherein A self-diplexing antenna having improved transmit / receive separation and antenna isolation characteristics, characterized in that the output terminal has a phase difference of 180 degrees between the first and second input terminals, and a miniature repeater using the same. The method of claim 5, wherein the service power divider, A self-diplexing antenna having improved transmit / receive separation and antenna isolation characteristics, characterized in that the input terminal has a phase difference of 180 degrees between the first and second output terminals, and a miniature repeater using the same. The method of claim 5, wherein the service power synthesizer, A self-diplexing antenna having improved transmit / receive separation and antenna isolation characteristics, characterized in that the output terminal has a phase difference of 180 degrees between the first and second input terminals, and a miniature repeater using the same. The method of claim 3, wherein the donor power distribution / synthesis unit, Self-die with improved transmit / receive separation and antenna isolation characteristics characterized by either T-network and 180-degree transmission line structure, Wilkinson power divider and 180-degree transmission line structure, or Magic-T A flexing antenna and a micro repeater using the same. The method of claim 5, wherein the service power distribution / synthesis unit, Self-die with improved transmit / receive separation and antenna isolation characteristics characterized by either T-network and 180-degree transmission line structure, Wilkinson power divider and 180-degree transmission line structure, or Magic-T A flexing antenna and a micro repeater using the same. The method of claim 5, wherein the donor power distribution / synthesis unit, A ground plane is formed between an antenna radiation element surface and a feeder circuit section consisting of a T-network and a 180-degree transmission line structure, a Wilkinson power divider and a 180-degree transmission line structure, or a Magic-T. Self-diplexing antenna and a miniature repeater using the same structure that solves the problem of transmission / reception separation and antenna isolation. The method of claim 3, wherein the donor power distribution / synthesis unit, Self-diplexing antenna with improved transmit / receive separation and antenna isolation characteristics, characterized in that a line is formed by forming a groove having a predetermined width and inserting a stripline in order to improve the isolation between terminals. And a micro repeater using the same. The method of claim 3, wherein the donor power distribution / synthesis unit, In order to improve the isolation between the terminals, a groove having a certain width is formed in a metal plate having a certain thickness, and a strip line is inserted thereinto to form a line covering the metal piece on the top, thereby improving transmission and reception separation and antenna isolation characteristics. A self-diplexing antenna and a micro repeater using the same. The method of claim 3, wherein the donor power distribution / synthesis unit, Transmitting / receiving separation and antenna isolation, characterized in that a line is formed in a structure in which a metal piece is provided around the stripline and a via-hole is formed using a metal pin to improve the isolation between terminals. Self-diplexing antenna with improved characteristics and micro repeater using the same. The method of claim 3, wherein the donor power distribution / synthesis unit, Self-diplexing antenna with improved transmit / receive separation and antenna isolation characteristics, characterized in that the line is formed with a structure that forms periodic grooves around the dielectric to improve the isolation between terminals, and a repeater using the same . The method of claim 5, wherein the service power distribution / synthesis unit, Self-diplexing antenna with improved transmit / receive separation and antenna isolation characteristics, characterized in that a line is formed by forming a groove having a predetermined width and inserting a stripline in order to improve the isolation between terminals. And a micro repeater using the same. The method of claim 5, wherein the service power distribution / synthesis unit, In order to improve the isolation between terminals, the transmission / reception separation and antenna isolation characteristics are improved by forming grooves having a predetermined width in a metal plate having a certain thickness, inserting strip lines, and covering the metal pieces on the top surface. A self-diplexing antenna and a micro repeater using the same. The method of claim 5, wherein the service power distribution / synthesis unit, Transmitting / receiving separation and antenna isolation, characterized in that a line is formed in a structure in which a metal piece is provided around the stripline and a via-hole is formed using a metal pin to improve the isolation between terminals. Self-diplexing antenna with improved characteristics and micro repeater using the same. The method of claim 5, wherein the service power distribution / synthesis unit, Self-diplexing antenna with improved transmit / receive separation and antenna isolation characteristics, characterized in that the line is formed with a structure that forms periodic grooves around the dielectric to improve the isolation between terminals, and a repeater using the same .

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