KR100442537B1 - Device for removing PIMD signal and Relay for mobile communication using the device - Google Patents

Abstract

The present invention relates to a PIMD signal removal device and a mobile communication repeater using the same, comprising: a transmission band filter for inputting multi-FA signals and passing only a first predetermined frequency band of an input signal; First and second transmit / receive antennas for transmitting an input signal to the air and receiving the air signal; A reception band filter for passing only a second predetermined frequency band of an input signal; And transmits a signal output from the transmission band filter to the first and second transmission / reception antennas, and transmits a signal received through the first and second transmission / reception antennas to the reception band filter. Call quality is improved by inputting the generated PIMD signal to the reception band filter, and having a phase remover for branching the PIMD signal into a plurality of phases and removing the PIMD signal by making the mutual phase difference of the branched PIMD signals 180 degrees. .

Description

Device for removing PIMD signal and relay for mobile communication using the device

The present invention relates to a device for removing a passive intermodulation (PIMD) signal used in a mobile communication system and a repeater for a mobile communication using the same.

As demand for mobile communication services increases, frequency band expansion and FA (Frequency Allocation) are increasingly used to accommodate them. As a result, distortion occurs due to nonlinearity of the device. In particular, quality degradation of the service signal is caused by an intermodulation (IMD) signal generated between FAs of a transmission signal. Previously, research on IMD signals by active devices has been conducted, but recently, research on IMD signals by passive devices, that is, passive intermodulation (PIMD) signals, has been conducted due to an increase in the output level due to the expansion of the service area. It is actively done.

Looking at the problems caused by the PIMD signal, depending on the power level of the signal, if a certain level of PIMD signal is generated, the communication system treats the noise signal as a data signal, causing a drop in the call quality or disconnection. do. In severe cases, the frequency band at which the PIMD signal occurs is blocked at all. This is a serious waste in terms of frequency resources, and in the case of service providers, the frequency band allocated to each user increases, resulting in the loss. Therefore, in terms of the efficiency of frequency utilization, elimination of the PIMD signal is urgent.

Although the cause of PIMD signal varies from device to device, it is classified into material nonlinearity and contact nonlinearity, which basically constitute passive devices, and methods to reduce the generation of PIMD signals in terms of materials and structures are being developed. .

Current mobile communication base station and relay station system is using a duplex (Duplexer) for separating and combining the transmission and reception signals. However, in case of duplex, PIMD characteristics are deteriorated at the T-junction that combines the transmission and reception signals, and in case of the divider, which is frequently used in the relay station, an isolation resistor is input when a high power level is input. Measurement results show that PIMD properties deteriorate at the junction of.

An object of the present invention is to provide a PIMD signal removal device for removing the PIMD signal generated from the passive element in the high power service of the mobile communication system.

Another object of the present invention to provide a repeater for mobile communication to improve the communication quality of service using the PIMD signal removal device.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a diagram illustrating a relay station equipped with a repeater and a mobile communication base station.

2 is a block diagram of a passive intermodulation (PIMD) signal removing device and a mobile communication repeater having the same according to the present invention.

FIG. 3 is a diagram illustrating an embodiment of the phase remover illustrated in FIG. 2.

4 is a view illustrating another embodiment of the phase remover shown in FIG. 2 in detail.

FIG. 5 is a graph illustrating the characteristics of the PIMD signal generated when the 20FA CDMA signal is applied to the repeater shown in FIG.

The present invention to achieve the above technical problem,

A transmission band filter for inputting the multi FA signals and passing only a first predetermined frequency band of the input signal; First and second transmit / receive antennas for transmitting an input signal to the air and receiving the air signal; A reception band filter for passing only a second predetermined frequency band of an input signal; And transmits a signal output from the transmission band filter to the first and second transmission / reception antennas, and transmits a signal received through the first and second transmission / reception antennas to the reception band filter. And a phase remover for inputting the generated PIMD signal to the reception band filter, and branching the PIMD signal into a plurality, and removing the PIMD signal by making a mutual phase difference of the branched PIMD signals 180 degrees. Board; A first terminal installed on the substrate and connected to the transmission band filter; A second terminal mounted to the substrate and connected to the reception band filter; A third terminal installed on the substrate and connected to the first transmit / receive antenna; A fourth terminal installed on the substrate and connected to the second transmit / receive antenna; A plurality of ground points disposed on the substrate; First to fourth wires connecting the first to fourth terminals and the ground points on the substrate; A first wiring connecting the first terminal and the third terminal on the substrate and having a phase difference of 180 degrees with each other; A second wiring connecting the second terminal and the fourth terminal on the substrate and having a phase difference of 180 degrees with each other; A third wiring connecting the first terminal and the second terminal on the substrate and having a phase difference of 90 degrees with each other; A first wiring connecting the third terminal and the fourth terminal on the substrate and having a phase difference of about 90 degrees with each other; A fifth wiring disposed between the third wiring and the fourth wiring on the substrate, the fifth wiring connecting the first wiring and the second wiring and having a phase difference of 90 degrees with each other; And a radio wave absorber disposed between the first to fifth wires on the substrate and absorbing radio waves diffused by the first to fifth wires to reduce the PIMD.

In order to achieve the above technical problem, the present invention also provides a transmission band filter for inputting multiple FA signals and passing only a first predetermined frequency band of the input signal; First and second transmit / receive antennas for transmitting an input signal to the air and receiving the air signal; A reception band filter for passing only a second predetermined frequency band of an input signal; And transmits a signal output from the transmission band filter to the first and second transmission / reception antennas, and transmits a signal received through the first and second transmission / reception antennas to the reception band filter. And a phase remover for inputting the generated PIMD signal to the reception band filter, and branching the PIMD signal into a plurality, and removing the PIMD signal by making a mutual phase difference of the branched PIMD signals 180 degrees. Board; A first terminal installed on the substrate and connected to the transmission band filter; A second terminal installed on the substrate and connected to a first transmit / receive antenna; A third terminal installed on the substrate and connected to the reception band pass filter; A fourth terminal installed on the substrate and connected to the second transmit / receive antenna; A transformer connected to the second terminal on the substrate and having a wavelength length; A first wiring connecting the first terminal and the transformer on the substrate and having a phase difference of 90 degrees with each other; A second wiring connecting the transformer and the third terminal on the substrate and having a phase difference of 90 degrees with each other; A third wiring connecting the third terminal and the fourth terminal on the substrate and having a phase difference of 90 degrees with each other; And a fourth wiring connecting the first terminal to the fourth terminal on the substrate and having a phase difference of 270 degrees with each other.

The present invention to achieve the above technical problem is a power amplifier for amplifying the input signal; A transmission band filter for passing a first predetermined frequency band of the signal output from the power amplifier; First and second transmit / receive antennas for firing an input signal into the air and receiving the air signal; A reception band filter for passing a second predetermined frequency band of an input signal; The signal output from the transmission band filter is transmitted to the first and second transmission and reception antennas, and the signal received through the first and second transmission and reception antennas is transmitted to the reception band filter, and the signal generated by the transmission band filter is generated. A phase remover for inputting a PIMD signal to the reception band filter, and branching the PIMD signal into a plurality and removing the PIMD signal by making a mutual phase difference of the branched PIMD signals by 180 degrees; And a low noise amplifier which removes noise included in the signal output from the reception band filter and amplifies the signal from which the noise is removed. A first terminal installed on the substrate and connected to the transmission band filter; A second terminal mounted to the substrate and connected to the reception band filter; A third terminal installed on the substrate and connected to the first transmit / receive antenna; A fourth terminal installed on the substrate and connected to the second transmit / receive antenna; A plurality of ground points disposed on the substrate; First to fourth wires connecting the first to fourth terminals and the ground points on the substrate; A first wiring connecting the first terminal and the third terminal on the substrate and having a phase difference of 180 degrees with each other; A second wiring connecting the second terminal and the fourth terminal on the substrate and having a phase difference of 180 degrees with each other; A third wiring connecting the first terminal and the second terminal on the substrate and having a phase difference of 90 degrees with each other; A first wiring connecting the third terminal and the fourth terminal on the substrate and having a phase difference of about 90 degrees with each other; A fifth wiring disposed between the third wiring and the fourth wiring on the substrate, the fifth wiring connecting the first wiring and the second wiring and having a phase difference of 90 degrees with each other; And a radio wave absorber disposed between the first to fifth wires on the substrate and absorbing radio waves diffused from the first to fifth wires to reduce the PIMD.

The present invention also provides a power amplifier for amplifying the input signal; A transmission band filter for passing a first predetermined frequency band of the signal output from the power amplifier; First and second transmit / receive antennas for firing an input signal into the air and receiving the air signal; A reception band filter for passing a second predetermined frequency band of an input signal; The signal output from the transmission band filter is transmitted to the first and second transmission and reception antennas, and the signal received through the first and second transmission and reception antennas is transmitted to the reception band filter, and the signal generated by the transmission band filter is generated. A phase remover for inputting a PIMD signal to the reception band filter, and branching the PIMD signal into a plurality and removing the PIMD signal by making a mutual phase difference of the branched PIMD signals by 180 degrees; And a low noise amplifier which removes noise included in the signal output from the reception band filter and amplifies the signal from which the noise is removed. A first terminal installed on the substrate and connected to the transmission band filter; A second terminal installed on the substrate and connected to a first transmit / receive antenna; A third terminal installed on the substrate and connected to the reception band pass filter; A fourth terminal installed on the substrate and connected to the second transmit / receive antenna; A transformer connected to the second terminal on the substrate and having a wavelength length; A first wiring connecting the first terminal and the transformer on the substrate and having a phase difference of 90 degrees with each other; A second wiring connecting the transformer and the third terminal on the substrate and having a phase difference of 90 degrees with each other; A third wiring connecting the third terminal and the fourth terminal on the substrate and having a phase difference of 90 degrees with each other; And a fourth wiring connecting the first terminal and the fourth terminal on the substrate and having a phase difference of 270 degrees with each other.

According to the present invention, the PIMD signal is removed.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a diagram illustrating a relay station equipped with a repeater and a mobile communication base station. Referring to FIG. 1, the mobile communication base station 111 transmits and receives a signal to and from the mobile communication repeater 131 installed in the relay station 121 through a wired 9141, for example, a coaxial cable or an optical fiber cable. The mobile communication repeater 131 communicates with devices such as mobile communication devices, such as a mobile phone, a PCS, and a PDA, or relays messages transmitted between the devices.

2 is a block diagram of a PIMD signal removal device and a mobile communication repeater using the same according to the present invention. Referring to FIG. 2, the repeater for mobile communication 131 includes first and second amplifiers 211 and 213, a transmission band filter 221, a reception band filter 223, a phase cancellation module 231, and a second antenna. First and second transmit / receive antennas 241 and 242 are provided.

The transmission band filter 221, the reception band filter 223, the phase remover 231, and the first and second transmit / receive antennas 241 and 242 constitute a PIMD signal removing device according to the present invention.

The first amplifier 211 amplifies the input signal T1 by a predetermined level. The first amplifier 211 is configured as a power amplifier. The signals T1 are multi FA signals composed of 1-20.

The transmission band filter 221 passes only the first predetermined frequency band of the signal output from the first amplifier 211. That is, all signals outside the first predetermined frequency band, for example, spurious signals, are removed by the transmission band filter 221. Therefore, the amount of noise included in the signal passing through the transmission band filter 221 is reduced to a minimum. The transmission band filter 221 is connected to the phase remover 231 through a wire 251. The transmission band filter 221 includes a high frequency passive element such as a connector, a cavity filter, a divider, and the like, and when the multi FA signals are input to the transmission band filter 221, PIMD signals are generated by high frequency passive elements. The PIMD signal is a signal that must be removed as a factor that weakens the transmission signal and degrades call quality.

The first and second transmit / receive antennas 241 and 242 emit an input transmission signal into the air and receive the air signal.

The use of two transmit / receive antennas expands the transmit / receive range. In order to further extend a transmission / reception range, two or more transmission / reception antennas 241 and 242 may be used.

The phase remover 231 transmits a signal output from the transmission band filter 221 to the first and second transmit / receive antennas 241 and 242, and receives a signal received through the first and second transmit / receive antennas 241 and 243. Transmit to band filter 223. The phase remover 231 inputs the PIMD signal generated by the transmission band filter 221 to the reception band filter 223, and branches the PIMD signal into a plurality of parts and makes the phase difference between the branched PIMD signals 180 degrees. Remove the PIMD signal. Accordingly, the transmission power of the signal emitted through the first and second transmit / receive antennas 241 and 242 is maximized, and as a result, the call quality of the mobile communication devices communicating through the repeater 131 is improved.

The reception band filter 223 passes only the second predetermined frequency band of the signal output from the phase remover 231. That is, all signals other than the second predetermined frequency band, for example, spurious signals, are all removed by the reception band filter 223. Therefore, the amount of noise included in the signal passing through the reception band filter 223 is reduced to a minimum. The reception band filter 223 is connected to the phase remover 231 through a wire 252.

The second amplifier 213 removes noise included in the signal output from the reception band filter 223 and amplifies the signal from which the noise is removed. The second amplifier 213 is configured as a low noise amplifier.

In this way, the transmission / reception range is extended by using two transmission / reception antennas, and the PIMD signal generated by the transmission band filter 221 is removed by using the phase eliminator 231. Accordingly, the power of the signal emitted from the first and second transmit / receive antennas 241 and 243 is maximized to improve the call quality through the repeater 131.

The repeater 131 converts the optical signal transmitted from the mobile communication base station 111 through the optical fiber cable 141 of FIG. 1 into an electrical signal, and transmits the converted optical signal to the first amplifier 211 and the second amplifier ( When the signal output from the 213 is converted into an optical signal and provided with a second converter for transmitting to the mobile communication base station 111 through the optical fiber cable 141, the repeater 131 may be used as an optical repeater.

FIG. 3 is a diagram illustrating an embodiment of the phase remover 231 illustrated in FIG. 2. Referring to FIG. 3, the phase remover 231 may include a substrate 301, first to fourth terminals 311 to 314, ground points 331 to 334, and first to fourth wires 321 to 324. And first to fifth wires 341 to 345 and radio wave absorbers 351 and 352. First to fourth terminals 311 to 314, ground points 331 to 334, first to fourth wires 321 to 324, first to fifth wires 341 to 345, and radio wave absorbers All of the 351 and 352 are provided on the substrate 301.

The first terminal 311 is connected to the transmission band filter 221 through the wiring 251, the second terminal 312 is connected to the reception band filter 223 through the wiring 252, and the third terminal 313 is formed through the wiring 252. The first transmit / receive antenna 241 and the fourth terminal 314 are respectively connected to the second transmit / receive antenna 243.

Ground points 331 to 334 ground the input signals.

The first wire 321 has a first terminal 311 and a ground point 331, the second wire 322 has a second terminal 312 and a ground point 332, and the third wire 323 has a third terminal. The 313 and the ground point 333 connect the fourth wire 324 to the fourth terminal 314 and the ground point 334, respectively. Harmonic signals input through the first to fourth terminals 311 to 314 are removed by being introduced into the ground points 331 to 334 through the first to fourth wires 321 to 324.

The first wire 341 connects the first terminal 311 and the third terminal 313 to have a phase difference of 180 degrees with each other. That is, when the transmission signal input through the first terminal 311 reaches the third terminal 313, the transmission signal is delayed by 180 degrees.

The second wiring 342 connects the second terminal 312 and the fourth terminal 314 and has a phase difference of 180 degrees with each other. That is, when the received signal input through the fourth terminal 314 reaches the second terminal 312, the received signal is delayed by 180 degrees.

The third wiring 343 connects the first terminal 311 and the second terminal 312 to have a phase difference of 90 degrees with each other. That is, when the transmission signal input through the first terminal 311 reaches the second terminal 312, the transmission signal is delayed by 90 degrees.

The fourth wiring 344 connects the third terminal 313 and the fourth terminal 314 to have a phase difference of 90 degrees with each other. That is, the signal transmitted between the third terminal 313 and the fourth terminal 314 is delayed by 90 degrees.

The fifth wiring 345 is positioned between the third wiring 343 and the fourth wiring 344, connects the first wiring 341 and the second wiring 342, and has a phase difference of 90 degrees to each other. That is, the signal transmitted through the fifth wiring 345 is delayed by 90 degrees.

The electromagnetic wave absorbers 351 and 352 are disposed between the first to fifth wires 341 to 345, and absorb the radio waves that are diffusely reflected from the first to fifth wires 341 to 345. Decreases the input PIMD signal.

The operation of the phase eliminator 231 to remove the PIMD signal will be described.

The transmission signal output from the transmission band filter 221 is input to the first terminal 311 of the phase eliminator 231. At this time, the harmonic noise (including the PIMD signal) included in the transmission signal is transmitted to the ground point 331 through the first wiring 321, so that a part of the noise is removed. The transmission signal input to the first terminal 311 is propagated to the third terminal 313 and the fourth terminal 314. The magnitudes and phases of the transmission signals reaching the third terminal 313 and the fourth terminal 314 are 0.5P ° 180 ° and 0.5P∠270 °, respectively. The transmission signal reaching the third terminal 313 is emitted into the air through the first transmission / reception antenna 241, and the transmission signal reaching the fourth terminal 314 is emitted into the air through the second transmission / reception antenna 242. do.

The transmission signal input to the first terminal 311 is induced to the second terminal 312 through three paths. The first is a path through the third wiring 343, the second is a path through the first wiring 341 and the fifth wiring 345 and the second wiring 342, and the third is the first wiring. The path passes through the 341, the fourth wiring 344, and the second wiring 342.

The magnitude and phase of the signal reaching the second terminal 312 through the third wire 343 from the first terminal 311 is 0.25P∠90 °, and the first terminal 311 from the first terminal 311. ) And the magnitude and phase of the signal reaching the second terminal 312 through the fifth terminal and the second terminal 312 are 0.5P∠270 °, and the first wiring 341 from the first terminal 311 The magnitude and phase of the signal reaching the second terminal 312 through the fourth wiring 344 and the second wiring 342 is 0.25P∠450 °.

The signal arriving from the first terminal 311 to the second terminal 312 through the first wiring 341, the fourth wiring 344, and the second wiring 342 is transferred from the first terminal 311 to the third wiring. The signal arriving at the second terminal 312 through 343 is in phase with the signal. Because (450 ° -360 ° = 90 °). Therefore, a signal reaching the second terminal 312 from the first terminal 311 through the first wiring 341, the fourth wiring 344, and the second wiring 342 is transferred from the first terminal 311 to the third terminal. The signal reaches the second terminal 312 through the wiring 343, and the magnitude and phase of the summed signal are 0.5P∠90 °. The signal reaches the second terminal 312 from the first terminal 311 via the first wiring 341, the fifth wiring 345, and the second wiring 342, and is the same in magnitude and opposite in phase. That is, the difference of 180 degrees cancels each other out. Therefore, the PIMD signal included in the transmission signal input to the first terminal 311 is greatly reduced or eliminated.

The signal input to the fourth terminal 314 through the second transmit / receive antenna 243 is first induced into the third terminal 313 through the fourth wiring 344, and the second is the second wiring 342. And the third wire 345 through the fifth wire 345 and the first wire 341, and the third wire of the second wire 342, the third wire 343, and the first wire 341. It is induced to the third terminal 313 through. In this way, the signal induced from the fourth terminal 314 to the third terminal 313 is canceled by being 180 degrees out of phase in a similar manner as described above. Accordingly, the signal input to the fourth terminal 314 does not adversely affect the transmission signal output through the third terminal 313, so that the radio wave output of the transmission signal output through the third terminal 313 is maximized. . The signal input to the fourth terminal 314 is bifurcated and transmitted to the first terminal 311 and the second terminal 312.

The signal input to the third terminal 313 is also bifurcated and transmitted to the first and second terminals 311 and 312 through an operation similar to that of the signal input through the fourth terminal 314. The terminal 314 is offset 180 degrees out of phase.

4 is a view illustrating another embodiment of the phase remover 231 shown in FIG. 2 in detail. Referring to FIG. 4, the phase remover 231 includes a substrate 401, first to fourth terminals 411 to 414, a transformer 421, and first to fourth wires 431 to 434. . The first to fourth terminals 411 to 414, the transformer 421, and the first to fourth wires 431 to 434 are all provided on the substrate 401.

The first terminal 411 is connected to a transmission band filter 221 of FIG. 2.

The second terminal 412 is connected to the first transmit / receive antenna 241 of FIG. 2.

The third terminal 413 is connected to the reception band filter 223 of FIG. 2.

The fourth terminal 414 is connected to the second transmit / receive antenna 242 of FIG. 2.

The transformer 421 connects the second terminal 412 and the node N1 and has a wavelength length of.

The first wiring 431 connects the first terminal 411 and the transformer 421, that is, the first terminal 411 and the node N1, and has a phase difference of 90 degrees.

The second wiring 432 connects the transformer 421 and the third terminal 413, that is, the node N1 and the third terminal 413, and has a phase difference of 90 degrees.

The third wire 433 connects the third terminal 413 and the fourth terminal 414 to have a phase difference of 90 degrees with each other.

The fourth wiring 434 connects the first terminal 411 and the fourth terminal 414 to have a phase difference of 270 degrees with each other.

The first to fourth wirings 431 to 434 have a circular shape.

In FIG. 4, an operation of removing the PIMD signal by the phase remover 231 will be described.

The transmission signal output from the transmission band filter 221 is input to the first terminal 411. The signal input to the first terminal 411 is branched to and transmitted to the second terminal 412 and the fourth terminal 414. do. The transmission signal transmitted from the first terminal 411 reaches the second terminal 412 via the first wiring 431 and the transformer 421, and the magnitude and phase of the signal at this time is 0.5P 0.5180 °. . The wavelength of the transformer 421 is, which has a phase difference of 90 degrees. The magnitude and phase of the transmission signal arriving from the first terminal 411 to the fourth terminal 414 is 0.5P∠270 °. Transmission signals arriving at the second and fourth terminals 412 and 414 are emitted into the air through the first transmit / receive antenna 241 and the second transmit / receive antenna 242, respectively.

The transmission signal input to the first terminal 411 is induced to the third terminal 413 through two paths. The first is a path through the first and second wires 431 and 432, and the second is a path through the fourth and third wires 434 and 433. The phase of the signal reaching the third terminal 413 from the first terminal 411 through the first and second wirings 431 and 432 is 180 °, and is formed through the fourth and third wirings 434 and 433. The phases of the signals arriving at the three terminals 413 are 360 degrees, and these two signals cancel each other out because they exhibit a phase difference of 180 degrees with each other. As such, the PIMD signal generated by the transmission band filter 221 of FIG. 2 and introduced into the first terminal 411 is greatly reduced or eliminated by the phase remover 231 of FIG. 4, and thus the reception band filter 223 of FIG. 2. ), And are not included in the signals emitted through the first and second transmit / receive antennas 241 and 242. Therefore, the transmission efficiency is improved.

The signal inputted to the second terminal 412 through the first transmit / receive antenna 241 is induced to the third terminal 413 through the second wiring 432, and the phase of the induced signal at this time is 180 degrees. In addition, the signal is induced to the third terminal 413 through the first, fourth, and third wires 431, 434, 433, and the phase of the signal is 540 degrees. 540 degrees is equal to 180 degrees (540 ° -360 ° = 180 °), so that the signal induced from the second terminal 412 to the third terminal 413 through the second wiring 432 and the first, fourth, and third The signals induced to the third terminal 413 through the wirings 431, 434, 433 are added to each other and transmitted to the reception band filter 223 of FIG. 2, thereby increasing efficiency.

The signal input to the fourth terminal 414 through the second transmit / receive antenna 242 of FIG. 2 is induced to the third terminal 413 through the third wiring 433, and the phase of the induced signal is 90 In addition, the phase of the signal is induced to the third terminal 413 through the fourth, first and second wirings 434, 431 and 432 at this time. 450 degrees is 90 degrees in phase. Therefore, the signal induced to the third terminal 413 through the third wiring 433 and the signal induced to the third terminal 413 through the fourth, first and second wirings 434, 431, and 432 are connected to the third terminal. At 413, they are added together and transmitted to the receive band filter 223 of FIG. 2, so that the efficiency is increased.

As described above, according to FIG. 4, since the PIMD signals generated by the transmission band filter 221 of FIG. 2 cancel each other at the third terminal 413, the transmission efficiency of the mobile communication repeater 131 of FIG. 2 is improved.

FIG. 5 is a graph illustrating the characteristics of the PIMD signal generated when the 20FA CDMA signal is applied to the repeater 131 shown in FIG. Referring to FIG. 5, it can be seen that the magnitude of the PIMD signal 511 passing through the phase remover 231 of the present invention is reduced by 30 dB or more compared with the conventional PIMD signal 521. In FIG. 5, it can be seen that the PIMD signal 511 changes in size with temperature.

The best embodiments have been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, according to the present invention, the PIMD signal generated by the transmission band filter 221 is greatly reduced or eliminated, and the first transmission / reception antenna 241 and the second transmission / reception antenna 242 are configured to have a communication range. Is expanded. Therefore, the separation between the transmission and reception signals is improved and the power of the transmission signal is increased, thereby improving the call quality.

Claims (6)

delete delete A transmission band filter for inputting the multi FA signals and passing only a first predetermined frequency band of the input signal; First and second transmit / receive antennas for transmitting an input signal to the air and receiving the air signal; A reception band filter for passing only a second predetermined frequency band of an input signal; And Transmits a signal output from the transmission band filter to the first and second transmission / reception antennas, transmits a signal received through the first and second transmission / reception antennas to the reception band filter, and generates the transmission band filter A phase remover for inputting a PIMD signal to the reception band filter, and branching the PIMD signal into a plurality of phases and removing the PIMD signal by making a mutual phase difference of the branched PIMD signals by 180 degrees; The phase remover Board; A first terminal installed on the substrate and connected to the transmission band filter; A second terminal mounted to the substrate and connected to the reception band filter; A third terminal installed on the substrate and connected to the first transmit / receive antenna; A fourth terminal installed on the substrate and connected to the second transmit / receive antenna; A plurality of ground points disposed on the substrate; First to fourth wires connecting the first to fourth terminals and the ground points on the substrate; A first wiring connecting the first terminal and the third terminal on the substrate and having a phase difference of 180 degrees with each other; A second wiring connecting the second terminal and the fourth terminal on the substrate and having a phase difference of 180 degrees with each other; A third wiring connecting the first terminal and the second terminal on the substrate and having a phase difference of 90 degrees with each other; A first wiring connecting the third terminal and the fourth terminal on the substrate and having a phase difference of about 90 degrees with each other; A fifth wiring disposed between the third wiring and the fourth wiring on the substrate, the fifth wiring connecting the first wiring and the second wiring and having a phase difference of 90 degrees with each other; And And a radio wave absorber disposed between the first to fifth wires on the substrate and absorbing radio waves diffused by the first to fifth wires to reduce the PIMD. A transmission band filter for inputting the multi FA signals and passing only a first predetermined frequency band of the input signal; First and second transmit / receive antennas for transmitting an input signal to the air and receiving the air signal; A reception band filter for passing only a second predetermined frequency band of an input signal; And Transmits a signal output from the transmission band filter to the first and second transmission / reception antennas, transmits a signal received through the first and second transmission / reception antennas to the reception band filter, and generates the transmission band filter A phase remover for inputting a PIMD signal to the reception band filter, and branching the PIMD signal into a plurality of phases and removing the PIMD signal by making a mutual phase difference of the branched PIMD signals by 180 degrees; The phase remover Board; A first terminal installed on the substrate and connected to the transmission band filter; A second terminal installed on the substrate and connected to a first transmit / receive antenna; A third terminal installed on the substrate and connected to the reception band pass filter; A fourth terminal installed on the substrate and connected to the second transmit / receive antenna; A transformer connected to the second terminal on the substrate and having a wavelength length; A first wiring connecting the first terminal and the transformer on the substrate and having a phase difference of 90 degrees with each other; A second wiring connecting the transformer and the third terminal on the substrate and having a phase difference of 90 degrees with each other; A third wiring connecting the third terminal and the fourth terminal on the substrate and having a phase difference of 90 degrees with each other; And And a fourth wiring connecting the first terminal and the fourth terminal on the substrate and having a phase difference of 270 degrees with each other. A power amplifier for amplifying the input signal; A transmission band filter for passing a first predetermined frequency band of the signal output from the power amplifier; First and second transmit / receive antennas for firing an input signal into the air and receiving the air signal; A reception band filter for passing a second predetermined frequency band of an input signal; The signal output from the transmission band filter is transmitted to the first and second transmission and reception antennas, and the signal received through the first and second transmission and reception antennas is transmitted to the reception band filter, and the signal generated by the transmission band filter is generated. A phase remover for inputting a PIMD signal to the reception band filter, and branching the PIMD signal into a plurality and removing the PIMD signal by making a mutual phase difference of the branched PIMD signals by 180 degrees; And A low noise amplifier which removes noise included in the signal output from the reception band filter and amplifies the signal from which the noise is removed; The phase remover Board; A first terminal installed on the substrate and connected to the transmission band filter; A second terminal mounted to the substrate and connected to the reception band filter; A third terminal installed on the substrate and connected to the first transmit / receive antenna; A fourth terminal installed on the substrate and connected to the second transmit / receive antenna; A plurality of ground points disposed on the substrate; First to fourth wires connecting the first to fourth terminals and the ground points on the substrate; A first wiring connecting the first terminal and the third terminal on the substrate and having a phase difference of 180 degrees with each other; A second wiring connecting the second terminal and the fourth terminal on the substrate and having a phase difference of 180 degrees with each other; A third wiring connecting the first terminal and the second terminal on the substrate and having a phase difference of 90 degrees with each other; A first wiring connecting the third terminal and the fourth terminal on the substrate and having a phase difference of about 90 degrees with each other; A fifth wiring disposed between the third wiring and the fourth wiring on the substrate, the fifth wiring connecting the first wiring and the second wiring and having a phase difference of 90 degrees with each other; And And a radio wave absorber disposed between the first to fifth wires on the substrate and absorbing radio waves diffused by the first to fifth wires to reduce the PIMD. A power amplifier for amplifying the input signal; A transmission band filter for passing a first predetermined frequency band of the signal output from the power amplifier; First and second transmit / receive antennas for firing an input signal into the air and receiving the air signal; A reception band filter for passing a second predetermined frequency band of an input signal; The signal output from the transmission band filter is transmitted to the first and second transmission and reception antennas, and the signal received through the first and second transmission and reception antennas is transmitted to the reception band filter, and the signal generated by the transmission band filter is generated. A phase remover for inputting a PIMD signal to the reception band filter, and branching the PIMD signal into a plurality and removing the PIMD signal by making a mutual phase difference of the branched PIMD signals by 180 degrees; And A low noise amplifier which removes noise included in the signal output from the reception band filter and amplifies the signal from which the noise is removed; The phase remover Board; A first terminal installed on the substrate and connected to the transmission band filter; A second terminal installed on the substrate and connected to a first transmit / receive antenna; A third terminal installed on the substrate and connected to the reception band pass filter; A fourth terminal installed on the substrate and connected to the second transmit / receive antenna; A transformer connected to the second terminal on the substrate and having a wavelength length; A first wiring connecting the first terminal and the transformer on the substrate and having a phase difference of 90 degrees with each other; A second wiring connecting the transformer and the third terminal on the substrate and having a phase difference of 90 degrees with each other; A third wiring connecting the third terminal and the fourth terminal on the substrate and having a phase difference of 90 degrees with each other; And And a fourth wiring connecting the first terminal and the fourth terminal on the substrate and having a phase difference of 270 degrees with each other.