WO2018194265A1 - Pimd signal removable base station antenna device including active element - Google Patents

Abstract

The present invention relates to a technique for removing a PIMD signal in a base station antenna device. The base station antenna device according to the present invention includes: a ground plate; one or more radiation elements supported by the ground plate and disposed on one side surface of the ground plate; a power distribution circuit for supplying power to the one or more radiation elements; a PCB circuit board including one or more nonlinear elements; a plurality of cables connected to the PCB circuit board; a shielding means for shielding the plurality of cables from an electromagnetic wave; a plurality of filter means connected to the plurality of cables and the shielding means; and a connection means for connecting the shielding means and the ground plate. According to the present invention, a PIMD signal generated in a nonlinear element inside an antenna can be removed or significantly reduced.

Description

Base station antenna device including active element capable of removing PIMD signal

The present invention relates to a base station antenna device capable of removing a PIMD signal, and more particularly, to a base station antenna device capable of removing or significantly reducing a PIMD signal generated from a nonlinear element inside an antenna.

Intermodulation (hereinafter referred to as IMD) signal may occur due to mutual interference between the multi-band frequencies of the antenna during high power transmission through the antenna, which is a passive element in a mobile communication system, which is called passive intermodulation distortion (PIMD). Distortion) signal. The PIMD signal is a noise signal rather than a normal signal, and when a cross-modulation signal of a predetermined level is introduced, the communication system processes it as a data signal, which degrades the normal signal and degrades the call quality. Therefore, the PIMD signal of the antenna should be suppressed within the required level required by the industry.

On the other hand, the cause of PIMD in RF components can be classified into contact nonlinearity and material nonlinearity. The causes of contact nonlinearity include the bonding capacity of the thin oxide layer between the conductors, the tunnel effect by the semiconductor action between the conductors in the metal contact, the micro-discharge due to the gaps and micro cracks between the metals, and the dust on the metal surface. And nonlinearity associated with metal particles, constriction resistance generated from metal bonds, and the causes of material nonlinearity include hysteresis effects such as nickel, iron, and cobalt, internal schottky effect, and Thermal heating due to limited conductivity and the like.

The same is true for the PIMD signal generated at the antenna, and generally, the PIMD signal is known to be mainly generated due to incomplete contact at the contact point between metals inside the antenna. Accordingly, in order to suppress the PIMD signal of the antenna, a focus has been placed on a technique of improving the connection stability of the connector and the cable and the connector and the connection terminal.

The base station antenna has several radiating elements, which creates a narrow beam width to limit the service area. At this time, in order to adjust the direction of the antenna beam mechanically changing the direction of the antenna and a motor for adjusting the phase of the signal applied to each radiating element is mounted inside the antenna and rotates the signal to be applied to each radiating element There is a method of electrically tilting a beam by giving a phase difference of a predetermined value. At this time, the equipment that recognizes the direction of the beam and adjusts the motor inside the antenna to a desired angle is called RET (Remote Electrical Tilt). Until now, it has been mainly installed outside the antenna. However, since the signal for recognizing the direction of the beam and the signal for controlling the motor are different for each antenna manufacturer, each manufacturer has recently installed iRET (Integrated Remote Electrical Tilt) inside the antenna. When a circuit board including an active element (non-linear element) enters the antenna, unlike the conventional antenna in which only passive elements exist, it is difficult to suppress the PIMD signal of the antenna to an appropriate level due to the nonlinear characteristic of the active element. It becomes very difficult.

Until recently, efforts to suppress PIMD signals of base station antennas have been made mainly through international standardization organizations such as the Antenna Interface Standards Group (AISG) as a matter of contact and materials, but in the case of antennas including active elements Has not yet achieved satisfactory results.

[Preceding technical literature]

[Patent Documents]

(Patent Document 1) KR 10-1017670 (2011.02.18)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in the field of base station antennas, a solution from a completely new point of view has been made so far that efforts to remove PIMD signals have been made mainly in terms of contact and materials for cables and connectors. By means, the object is to eliminate or reduce the PIMD signal of the base station antenna comprising the active element. Therefore, the purpose of the present invention is to obtain a result that satisfies the industry standard, which has not been achieved so far, for a base station antenna including an active element.

On the other hand, the technical problem to be achieved by the present invention is not limited to the above-mentioned technical problem, various technical problems can be included within the scope apparent to those skilled in the art from the following description.

According to an embodiment of the present disclosure, a base station antenna apparatus capable of removing a PIMD signal may include: a ground plate; One or more radiating elements supported by the ground plate and disposed on one side of the ground plate; A power distribution circuit for supplying power to the one or more radiation elements; A PCB circuit board comprising one or more nonlinear elements; A plurality of cables connected to the PCB circuit board; Shielding means for shielding the plurality of cables from electromagnetic waves; A plurality of filter means connected to the plurality of cables and the shielding means; And connecting means for connecting the shielding means and the ground plate.

The shielding means may be a metal foil or a metal braid.

The plurality of copying means may be multi-band copying means for copying signals of different frequency bands.

The ground plate may be a reflector that reflects power radiated by the radiation means in a specific direction.

The PCB circuit board may further include a ground portion.

According to another embodiment of the present invention, a base station antenna apparatus capable of removing a PIMD signal may include: a ground plate; One or more radiation elements supported and disposed by the ground plate on one side of the ground plate; A power distribution circuit for supplying power to the one or more radiation elements; A PCB circuit board comprising one or more nonlinear elements and a ground portion; A plurality of cables connected to the PCB circuit board; And a plurality of filter means connected to each of the plurality of cables and the ground portion.

The shielding means may be a metal foil or a metal braid.

The plurality of copying means may be multi-band copying means for copying signals of different frequency bands.

The ground plate may be a reflector that reflects power radiated by the radiation means in a specific direction.

According to the present invention, it is possible to eliminate or significantly reduce the PIMD signal generated inside the base station antenna including the active element.

According to the present invention, it is possible to meet the industry's requirements for the PIMD signal generated inside the base station antenna including the active element.

On the other hand, the effects of the present invention is not limited to the above-mentioned effects, various effects may be included within the scope apparent to those skilled in the art from the following description.

1 illustrates a principle of generating a PIMD signal in a base station antenna.

2 illustrates a base station antenna apparatus including an active element capable of removing a PIMD signal according to an embodiment of the present invention.

3 illustrates a base station antenna device including an active device capable of removing a PIMD signal according to another embodiment of the present invention.

Details of the above-described objects and technical configurations of the present invention and the effects thereof according to the present invention will be more clearly understood by the following detailed description based on the accompanying drawings.

Hereinafter, a base station antenna device including an active element capable of removing a PIMD signal according to the present invention will be described in detail with reference to the accompanying drawings.

The foregoing and further aspects are embodied through the embodiments described with reference to the accompanying drawings. It is to be understood that the components of the embodiments may be variously combined within the embodiments as long as there is no contradiction between each other and each other. Furthermore, the proposed invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In addition, when a part "contains" a certain element, this means that the element must be included regardless of the other elements, and is not intended to exclude the possibility of inclusion of other elements.

In addition, throughout the specification, when a part is "connected" to another part, it is not only "directly connected", but also "electrically connected" between other elements in between. Include. Furthermore, in the specification, a signal means an electric quantity such as a voltage or a current.

1 illustrates that a PIMD signal is generated at a base station antenna.

Referring to FIG. 1, leakage power is generated behind a ground plate in a power distribution circuit, a radiating element, and the like until transmission power entering the antenna input port reaches a radiating element of the antenna. The leakage power may be introduced into a cable connecting each signal generator such as a motor and a sensor, and a PCB circuit board including nonlinear elements. The signals I _{1 +, f1 + f2,} I _{1-, f1 + f2} … I _N , _{f1 + f2} of the two frequency bands input to the PCB circuit board through the cable are generated by nonlinear elements in the PCB circuit board. Intermodulated (IMD) Signals P _2f2-f1 and P _2f1-f2 , and the generated intermodulation (IMD) signals are radiated back to the antenna ground plate and the power distribution circuit through the cable, which distorts the normal signal and degrades the call quality. It acts as a cause.

2 is a diagram illustrating a base station antenna device including an active element capable of removing a PIMD signal according to an embodiment of the present invention.

Referring to FIG. 2, the base station antenna device capable of removing the PIMD signal may be electrically connected to the signal generator 10 through a cable 100 and include a PCB circuit board 200 including a plurality of nonlinear elements 210 and a filter. Means 600, a ground portion 220 formed on the opposite side of the surface on which the non-linear element 210 of the PCB circuit board 200 is formed, a ground plate 300 installed between the ground portion 220 and the radiation element 400 ), And the like.

The cable 100 is configured to electrically connect a signal generated from each signal generator 10 such as a motor or a sensor to a pattern (nonlinear element) 210 formed on the PCB circuit board 200. The PCB circuit board 200 Is connected to the non-linear device 210. That is, the cable 100 is electrically connected to send and receive signals with the nonlinear elements 210 formed on the PCB circuit board 200.

In addition, the cable 100 is required to reduce the antenna transmission power of f1 + f2 flowing into the nonlinear element 210 to reduce the PIMD generated from the nonlinear element 210, so that the cable 100 is shielded by a metal conductor or the like ( Shield (500) and is connected to the ground plate 300 by the connecting means (510). The connecting means 510 may be connected to one or both ends of the shielding means 500 as a ground wire.

A plurality of nonlinear elements 210 exist on the PCB circuit board 200, and signals generated by each signal generator 10 are transmitted to the nonlinear elements 210 of the PCB circuit board 200 through the cable 100. do. The transmit power entering the antenna input port is divided into two frequency bands input to the PCB circuit board 200 by the leakage power from the radiation element and the power distribution circuit. The signals I _{1+, f1 + f2,} I _{1-, f1 + f2} ... I _N , _{f1 + f2} are generated by the IMD signal P _2f2-f1 , P by the nonlinear element 210 in the PCB circuit board 200. _2f1-f2 ), the PIMD signal generated from the nonlinear element 210 flows out of the cable 100, is radiated again from the cable, and flows back into the power distribution circuit and the radiating element 400 to distort the normal signal.

The filter means 600 is a signal (I _{1 +, f 1 + f 2,} I _{1-, f 1 + f 2} ... I _N , _{f 1 + f 2} ) introduced into the cable 100 is introduced to the non-linear elements of the PCB circuit board In a configuration for blocking, the cable 100 and the cable shielding means 500 is connected. That is, the plurality of filter means 600 is connected to the cable 100 through a connection line 610, the connection line 610 is also connected to the cable shielding means 500. Therefore, the filter means 600 is connected to the input signal (I _{1 +, f 1 + f 2,} I _{1-, f 1 + f 2} ... I _N , _{f 1 + f 2} ) through the cable shielding means 500 to the ground plate 300. By suppressing the generation of PIMD signal.

Filter means 600 is provided for each signal generator, can be configured in various ways according to the frequency characteristics, if the desired frequency band can be cut or passed there is no limit to the type. The filter is provided with the number of signal generators and cables can be connected to each cable.

A radiation device 400 is disposed on one surface of the ground plate 300, and lines for distributing an input signal to the radiation device are formed on the other surface.

The ground plate 300 serves as a reflector to direct power from the radiating element to the front of the antenna, and a power distribution circuit (no number) is disposed on the other side of the ground plate.

Hereinafter, a process of removing the PIMD signal in the antenna device configured as described above will be described.

Power that drives each of the signal generators 10, such as a motor and a sensor, and signals generated by the signal generator are input to the PCB circuit board 200 through the cable 100, and leaked from the radiating element of the antenna and the power distribution circuit. The leaked power is also transmitted to the nonlinear device 210 of the PCB circuit board 200 through the cable 100. The signals I _{1+, f1 + f2,} I _{1-, f1 + f2} … I _N , _{f1 + f2} of the two frequency bands inputted from the leakage power and input to the nonlinear element 210 are PIMD signals P _{2f2-. f1} , P _2f1-f2 ). In the present invention, the signal leaked from the radiating element and the power distribution circuit and the like introduced into the cable 100 is filtered by the filter means 600 and flows through the ground line 510 to the ground plate 300 by the signal by the leakage power By preventing them from being transmitted to the nonlinear elements of the PCB circuit board 200, it is possible to suppress the generation of the PIMD signals P _2f2-f1 and P _2f1-f2 .

3 is a diagram illustrating a base station antenna device including an active element capable of removing a PIMD signal according to another embodiment of the present invention.

Referring to FIG. 3, the antenna device capable of removing the PIMD signal may be electrically connected to the signal generator 10 through a cable 100, and may include a plurality of nonlinear elements 210 and a ground circuit. , A plurality of filter means 600 formed on the PCB circuit board 200, a ground part 220 formed on the opposite side of the surface on which the nonlinear elements 210 of the PCB circuit board 200 are disposed, and a ground plate 300. ), And the like.

The embodiment of FIG. 3 differs from the embodiment of FIG. 2 in that the filter means 600 connected to each cable 100 do not have shielding means for shielding the cable 100. It is connected to the branch 220.

Other configurations and their functions are the same as in the description of FIG.

As in the embodiment of FIG. 2, since signals due to leakage power from the antenna radiation element and the like generate PIMD signals by nonlinear elements, the PIMD signal introduced into the cable 100 on the PCB circuit board 200 of FIG. 3. Filter means 600 are formed to remove the.

The filter means 600 formed on the PCB circuit board 200 has a configuration provided for each cable and connects the cable 100 and the grounding part 220 through the connection line 710.

Hereinafter, the principle of removing the PIMD signal in the antenna device configured as described above will be described.

Signals generated by each signal generator 10 such as a motor and a sensor are input to the PCB circuit board 200 via the cable 100, and the leakage power leaked from the radiating element and the power distribution circuit of the antenna is also included in the cable ( 100 is transmitted to the nonlinear device 210 of the PCB circuit board 200. The signals I _{1 +, f1 + f2,} I _{1-, f1 + f2} … I _N , _{f1 + f2} derived from the leakage power and input to the nonlinear element 210 are PIMD signals P _2f2-f1 and P _{2f1. -f2} ). In the present invention, the signals I _{1+, f1 + f2,} I _{1-, f1 + f2} … I _N , _{f1 + f2} leaked from the radiating element, the power distribution circuit and the like and flowed into the cable 100 are filter means ( 600 is filtered by the connection line 710 flows out to the ground 220, it can be prevented from being transmitted to the non-linear device 210 of the PCB circuit board 200 can suppress the PIMD generation.

Although the present invention has been described as described above, it will be appreciated by those skilled in the art that the present invention may be implemented in other forms while maintaining the technical spirit and essential features of the present invention. .

Therefore, the above-described embodiments are merely exemplary and are not intended to limit the scope of the present invention only to the above embodiments. In addition, the flowcharts shown in the drawings are merely exemplary in order to obtain the most desirable results in practicing the present invention, and other steps may be added or some steps may be deleted.

The scope of the present invention will be defined by the claims, but all modifications or variations derived from a configuration equivalent to that derived directly from the claims description are also included within the scope of the present invention. Should be interpreted as

Claims (12)

1. Ground plate;

   One or more radiation elements supported and disposed by the ground plate on one side of the ground plate;

   A power distribution circuit for supplying power to the one or more radiation elements;

   A PCB circuit board comprising one or more nonlinear elements;

   A plurality of cables connected to the PCB circuit board;

   Shielding means for shielding the plurality of cables from electromagnetic waves;

   A plurality of filter means connected to the plurality of cables and the shielding means; And

   Connecting means for connecting the shielding means and the ground plate;

   The base station antenna device including a, active element capable of removing the PIMD signal.
2. The method according to claim 1,

   The shielding means is a base station antenna device comprising an active element capable of removing the PIMD signal, characterized in that the metal foil or metal braid.
3. The method according to claim 1,

   The plurality of copying means is a multi-band copying means, characterized in that for copying signals of different frequency bands, PIMD signal removal, base station antenna apparatus comprising an active element.
4. The method according to claim 1,

   The ground plate is a base station antenna apparatus including an active element capable of removing the PIMD signal, characterized in that the reflection plate for reflecting the power radiated from the radiation means in a specific direction.
5. The method according to claim 1,

   The PCB circuit board further comprises a ground, characterized in that the base station antenna device including an active element capable of removing the PIMD signal.
6. The method according to claim 1,

   The plurality of filter means is installed outside the PCB circuit board, the base station antenna apparatus including an active element capable of removing the PIMD signal.
7. Ground plate;

   One or more radiation elements supported and disposed by the ground plate on one side of the ground plate;

   A power distribution circuit for supplying power to the one or more radiation elements;

   A PCB circuit board comprising one or more nonlinear elements and a ground portion;

   A plurality of cables connected to the PCB circuit board; And

   A plurality of filter means connected to each of the plurality of cables and the ground portion;

   The base station antenna device including a, active element capable of removing the PIMD signal.
8. The method according to claim 7,

   The shielding means is a base station antenna device comprising an active element capable of removing the PIMD signal, characterized in that the metal foil or metal braid.
9. The method according to claim 7,

   The one or more radiating means is a multi-band radiating means, characterized in that for copying signals of different frequency bands, PIMD signal removal, base station antenna device comprising an active element.
10. The method according to claim 7,

    The ground plate is a base station antenna apparatus including an active element capable of removing the PIMD signal, characterized in that the reflection plate for reflecting the power radiated from the radiation means in a specific direction.
11. The method according to claim 7,

    And the ground portion is formed on a surface opposite to a surface on which the non-linear elements are located on the PCB circuit board.
12. The method according to claim 7,

    The filter means is formed on the PCB circuit board, characterized in that the base station antenna device including an active element capable of removing the PIMD signal.

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