KR101124849B1 - Radio frequency connector - Google Patents

Abstract

An RF connector is disclosed. The RF connector according to the present invention has a coupling plate, a housing having a front protrusion and a rear protrusion protruding forward and rearward with respect to the coupling plate, respectively, a center conductor passing through the center of the front protrusion and the rear protrusion, and the rear protrusion. And an inner dielectric having an insertion member to be inserted, a center hole inserted into and fixed to the insertion member, and a circumferential hole formed around the center hole. And the internal dielectric may be formed by polyether ether ketone. The RF connector as described above can minimize the influence of the PIMD.

RF, connector, PIMD

Description

RF Connector {RADIO FREQUENCY CONNECTOR}

The present invention relates to an RF connector, and more particularly, to an RF connector capable of reducing Passive Intermodulation Distortion (PIMD).

The most important factor in mobile communication is to increase service capacity and improve call quality. And one of the biggest influences on call quality and service capacity is Intermodulation Distortion (IMD).

IMD is two or more signal frequencies that interfere with each other and cause unwanted parasitic signals. This phenomenon is called Passive Intermodulation Distortion (PIMD) when this occurs in passive devices. Unlike Active IMD, which occurs in active devices, PIMD has been considered only in high-power communication systems such as satellite communication until recently, and has been almost ignored in commercial mobile communication. However, as the mobile communication service expands, interference between neighboring base stations increases and the IMD problem accordingly increases, thereby causing problems not only for active IMD but also for PIMD. Active IMD has been a subject of steady research for a long time, so there is no big problem. However, PIMD has not been considered in the construction of communication system until recently.

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, Nonlinearities associated with metal particles, constriction resistances from metal bonds, etc.The causes of material nonlinearities include hysteresis effects such as nickel, iron, and cobalt, internal shottkey effects, and limited conductivity in conductors. And thermal heating.

This may be a problem at various stages of the PIMD mobile communication system, especially in the base station system is a major factor of unexpected noise generation.

1 is a diagram illustrating an example in which parasitic signals are generated by PIMD.

Referring to FIG. 1, when there are two tone signals f1 and f2, a parasitic signal component generated by PIMD is shown.

As shown in FIG. 1, parasitic signal components occurring in a band close to the original frequency of a signal may cause a big problem at the front end of a mobile communication system that transmits and receives signals.

2 is a diagram illustrating a configuration of a front end of a mobile communication system.

Referring to FIG. 2, the front end portion of the mobile communication system includes a reception filter 200, a transmission filter 202, a low noise amplifier (LNA) 204, a signal processor 206, and an antenna 208. .

The transmission filter 200 functions to filter the transmission signal frequency band transmitted from the mobile communication system to the mobile communication terminal, and the reception filter 202 filters the reception signal frequency band transmitted from the mobile communication terminal to the mobile communication system. Function

The low noise amplifier 204 removes and amplifies the noise of the signal received from the mobile communication terminal and filtered by the receive filter 202.

In general, in a mobile communication system, a received signal and a transmitted signal use different frequency bands, and these frequency bands are generally in close proximity. For example, in a CDMA mobile communication system, a transmission frequency band has a 1930 MHz to 1990 MHz band, and a reception frequency band has a signal of a 1850 MHz to 1910 MHz band.

In this case, the parasitic signal component generated by the PIMD in the transmission signal may have a reception signal band. Although the magnitude of the parasitic signal component is quite small, it can cause serious errors when the parasitic signal passes through the receive filter 202 and enters the low noise amplifier 204.

Therefore, suppressing the parasitic signal by PIMD at the front end of the mobile communication system is a very important factor in the call quality.

As described above, the parasitic signal component caused by PIMD is caused by various causes, but it is known that the parasitic signal component caused by PIMD occurs at the front end of the mobile communication system, especially when a passive element such as a resistor is connected to the end of the RF equipment. There is a need for means to minimize the generation of parasitic signal components thereby.

The present invention is to solve the conventional problems as described above, to provide an RF connector that can minimize the impact of the PIMD.

In accordance with an aspect of the present invention, an RF connector includes a housing having a front protrusion and a rear protrusion that protrude forward and rearward with respect to a coupling plate and a coupling plate, and a center conductor penetrating the center of the front protrusion and the rear protrusion, And an inner dielectric having an insertion member inserted into the rear protrusion, a center hole inserted into and fixed to the insertion member, and a circumferential hole formed around the center hole. And the internal dielectric may be formed by polyether ether ketone.

Embodiments of the RF connector according to the present invention may have one or more of the following features. For example, in the insertion member, the first fixing ring and the second fixing ring may be fixed to the front and the rear of the internal dielectric, respectively. In addition, the first fixing ring and the second fixing ring may be formed of a metal material.

The front dielectric may be inserted into the front protrusion, and the front dielectric may have a through hole through which the center conductor can pass. And a boss may be formed around the center hole.

The present invention can provide an RF connector that can reduce the influence of the PIMD by forming a peripheral hole around the center conductor in the internal dielectric.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as front and rear may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout the specification and claims. The description will be omitted.

3 is a perspective view of the RF connector 100 according to an embodiment of the present invention, and FIG. 4 is an exploded perspective view of the RF connector 100 illustrated in FIG. 3. 5 is a cross-sectional view of the RF connector 100 taken along line AA ′ of FIG. 3.

3 to 5, the RF connector 100 according to the present embodiment includes a housing 120 forming an outer body, a center conductor 140 penetrating through the housing 120, and a center conductor 140. The front dielectric 150 inserted into the front of the housing 120, the insertion member 170 inserted into the rear of the housing 120, and the inside inserted into the insertion member 170 to support the center conductor 140. Dielectric 160.

The RF connector 100 according to the present exemplary embodiment includes an internal dielectric 160 supporting the central conductor 140 and insulating it from the insertion member 170. As shown in FIG. 4, the internal dielectric 160 has a center hole 162 through which the center conductor 140 can be inserted and a circumferential hole 164 formed around the center hole 162. Include. The circumferential hole 164 is formed at regular intervals around the center hole 164, and thus the effect of the PIMD by forming the circumferential hole 164 around the center hole 162 of the internal dielectric 160 in a circular manner Can be reduced.

The housing 120 has a front protrusion 122 protruding forward and a rear protrusion 132 protruding backward about the coupling plate 126 having a square shape. The housing 120 forms the outer body of the RF connector 100 and is used to be connected to a coaxial cable and connected to a planar conductor.

The coupling plate 126 is a portion for fixing the housing 120 to another device, and has a rectangular plate shape. Fastening holes 128 are formed at each corner of the coupling plate 126, so that the coupling plate 126 may be fastened to an external device by using a screw (not shown). Based on the coupling plate 126, the front projection 122 is formed in the front and the rear projection 132 is formed in the rear.

The front protrusion 122 has a hollow cylindrical shape, and the front dielectric 150 is press-fitted and fixed therein. The front protrusion 122 is in communication with the rear protrusion 132 as shown in FIG. 5. In addition, the center conductor 140 is located at the center of the front protrusion 122 and the rear protrusion 132.

The rear protrusion 132 also has a hollow cylindrical shape, and the insertion member 170 and the inner dielectric 160 are press-fitted and fixed therein. A thread 138 is formed around the rear protrusion 132 to be fastened to a cable (not shown). The stopper 136 is formed inside the rear protrusion 132.

Referring to FIG. 5, the stopper 136 is a portion protruding in the center direction from the inside of the rear protrusion 132 to contact the tip of the insertion member 170 so that the insertion member 170 may not be inserted anymore. . Therefore, when the front end portion of the insertion member 170 inserted into the rear protrusion 132 is stopped by the stopper 136, insertion is stopped and its position is determined.

The central conductor 140 penetrates the front protrusion 122 and the rear protrusion 132, and a part of the center conductor 140 protrudes out of the front protrusion 122. The center conductor 140 is inserted into the through hole 152 formed in the front dielectric 150 and the center hole 162 formed in the inner dielectric 160. As a result, as shown in FIG. 5, the insertion member 170 is provided. ), The front protrusion 122 and the rear protrusion 132 are in an insulated state.

The front dielectric 150 has a cylindrical shape, and a through hole 152 is formed at the center thereof. The through-hole 152 formed in the center of the front dielectric 150 is inserted through the center conductor 140 as described above. The front dielectric 150 is press-fitted into the front protrusion 122 and fixed. Therefore, the front dielectric 150 serves to support the center conductor 140 located inside the front protrusion 122.

The insertion member 170 has a hollow cylindrical shape and is press-fitted to the rear protrusion 132 to be fixed. Inside the insertion member 170, as can be seen in FIG. 5, an internal dielectric 160, a first fixing ring 180, and a second fixing ring 190 are positioned. And the insert portion 170 has a locking step 172 protruding inward.

As can be seen in Figure 5, the locking step 172, the first fixing ring 180 located inside the insertion member 170 is caught. Therefore, the position of the first fixing ring 180 inserted into the insertion member 170 is caught by the locking step 172 to determine its position.

The first fixing ring 180 has a ring shape and is press-fitted into the insertion member 170 to be fixed. The first fixing ring 180 is caught by the locking step 172 formed in the insertion member 170, and its position is determined. In addition, the second fixing ring 190 also has a ring shape, and is pressed into the insertion member 170 and fixed. The first fixing ring 180 is located in front of the inner dielectric 160, and the second fixing ring 190 is located behind the inner dielectric 160. In addition, the first fixing ring 180 and the second fixing ring 190 are press-fitted into the insertion member 170 and fixed. Thus, the inner dielectric 160 and the center conductor 140 inserted therein can be prevented from being spaced apart in the axial direction of the housing 120.

The first fixing ring 180 and the second fixing ring 190 may be formed of the same metal material as the housing 120 and the insertion member 170. Since the first fixing ring 180 and the second fixing ring 190 are fixed to the front and the rear of the inner dielectric 160 into which the center conductor 140 is inserted, consequently, the center conductor 140 is firmly secured. To be fixed.

Hereinafter, an internal dielectric 160 according to an embodiment of the present invention will be described with reference to FIGS. 6 to 7.

6 is a rear view of the RF connector 100 according to an embodiment of the present invention, and FIG. 7 is a perspective view of the internal dielectric 160.

6 to 7, the inner dielectric 160 is positioned inside the insertion member 170 to support the center conductor 140, and the center hole 162 is inserted and penetrates the center conductor 140. And a circumferential hole 164 formed around the center hole 162. The front and rear surfaces of the inner dielectric 160 are in contact with the first fixing ring 180 and the second fixing ring 190, respectively. As a result, the internal dielectric 160 is interposed between the first fixing ring 180 and the second fixing ring 190 so as to be firmly coupled within the insertion member 170.

A boss 166 is formed around the center hole 162. The boss 166 protrudes around the center hole 162 and serves to support the center conductor 140.

The circumferential hole 164 disposed in a circle around the center hole 162 penetrates through the internal dielectric material 160 in the longitudinal direction. The circumferential hole 164 serves to prevent the internal dielectric 160 from thermally deforming. 6 to 7 illustrate that six circumferential holes 164 are disposed at an angle of 60 degrees around the center hole 162, but the number of the circumferential holes 164 and the angle between the circumferential holes 164 are different. Of course it can.

In order to prevent thermal deformation, the internal dielectric material 160 may be formed of polyether ether ketone (PEEK). Polyether ether ketone has the highest heat resistance among thermoplastic resins, and has excellent impact resistance and fatigue resistance, and has a relatively small dielectric tangent at high frequency.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that modifications and variations can be made.

1 is a diagram illustrating an example in which parasitic signals are generated by PIMD.

2 is a diagram illustrating a configuration of a front end of a mobile communication system.

3 is a perspective view of an RF connector according to an embodiment of the present invention.

4 is an exploded perspective view of an RF connector according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view of an RF connector along line AA ′ of FIG. 3.

6 is a rear view of an RF connector according to an embodiment of the present invention.

7 is a perspective view of an internal dielectric according to an embodiment of the present invention.

Claims (5)

A housing having a coupling plate and a front protrusion and a rear protrusion which respectively protrude forward and backward with respect to the coupling plate; A center conductor penetrating the center of the front protrusion and the rear protrusion; An insertion member inserted into the rear protrusion; An inner dielectric having a center hole inserted into the insertion member and fixed to the insertion member and having a circumferential hole formed around the center hole, The internal dielectric is an RF connector formed by polyether ether ketone (PEEK). The method of claim 1, An RF connector, characterized in that the first fixing ring and the second fixing ring is fixed to the front and rear of the internal dielectric, respectively in the insertion member. 3. The method of claim 2, The first fixing ring and the second fixing ring is an RF connector, characterized in that formed by a metal material. The method of claim 1, The front dielectric is inserted into the front protrusion, And the front dielectric has a through hole through which the center conductor can pass. The method of claim 1, An RF connector, characterized in that the boss is formed around the center hole.

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