JP2011233282A - Connector for wireless antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connector for wireless antenna and a wireless circuit board in which the impedance can be matched by a simple configuration and a wireless signal can be taken out even in the rear surface of the board.SOLUTION: The connector for wireless antenna which transmits a wireless signal on a board to a wireless antenna has predetermined impedance characteristics and comprises a conductor (connector pin) which is elongated in the length longer than the thickness of the board mounting the connector for wireless antenna, in order to transmit a wireless signal between the surface and the rear surface of the board. Since variations in the impedance characteristics of the connector pin of a connector for wireless antenna are small as compared with those of the VIAs or through holes, signals can be transmitted easily to the opposite surface of the board.

Description

    The present invention relates to a structure of a connector for a wireless antenna, and more particularly to a connector provided on a substrate of an electronic circuit.

  In the radio circuit, the conductor of the radio circuit is used without bending as steeply as possible in order to make the impedance characteristic constant. This is because, generally, when the direction of 90 degrees is suddenly changed in the plane of the radio circuit board with respect to the conductor, signal reflection occurs on the conductor. As a countermeasure, a curved conductor is usually used. The same applies to the vertical direction of the substrate surface, and in the conductor path of the radio circuit, a through-hole or VIA that requires bending of 90 degrees with respect to the vertical direction is rarely used. Therefore, it is designed not to use a through hole or VIA in the vertical direction and to bend the conductor to 90 degrees in the horizontal direction so as to suppress signal reflection.

  In general, in the manufacture of radio circuit conductors, an impedance calculation method using a microstrip line is used in order to maintain a constant impedance characteristic. In this case, the impedance characteristic requires continuous parallelism with the ground conductor (GND), so this calculation method is applied only in the horizontal direction of the conductor and is not considered in the vertical direction (due to the structure of the board). In the vertical direction, an insulator is interposed).

  On the other hand, however, there is a strong demand for arranging conductors in the vertical direction in the design and manufacturing process of wireless circuits. For example, when considering the design of a radio circuit board, placing the conductors in the direction perpendicular to the board greatly increases the degree of freedom in circuit design, and thus directly affects the size and cost of the final product. It becomes an important factor. In addition, there is a strong demand for the inspection of wireless circuit boards. In particular, the fact that the position of the wireless connector can be installed on any surface of the circuit board means that the jig used for the inspection can be simplified and the manufacturing process can be simplified. It is expected to contribute greatly to efficiency.

  Therefore, in Patent Document 1 below, in the VIA for connecting the conductor pattern from the front surface to the back surface, a pattern having the same width as the surface layer pattern of the substrate is formed along the wall surface of the cylindrical through hole so as to be continuous with the surface layer pattern. VIA with impedance matching by using the above-described stripline structure is disclosed.

JP 2001-230508 A

  However, the invention disclosed in Patent Document 1 has a complicated manufacturing process, and it is too expensive to simply transmit a wireless signal to the back surface of the substrate (the back surface of the wireless circuit). was there.

  On the other hand, in the wireless system, the position of the connector for the wireless antenna is limited to the same plane as the wireless circuit, which is often a limitation in the inspection of the wireless system and the balance with other circuit designs. .

  In view of the above problems, the present invention discloses a connector for a wireless antenna and a wireless circuit board that can achieve impedance matching with a simple configuration and can extract a wireless signal even on the back surface of the board. Objective.

A wireless connector according to a first embodiment of the present application is a wireless antenna connector for transmitting a wireless signal on a substrate to a wireless antenna, the wireless antenna connector having a predetermined impedance characteristic, and the substrate. In order to transmit a radio signal between the front and back, a conductor extended to a length equal to or greater than the thickness of the substrate on which the radio antenna connector is mounted is provided.
A wireless circuit board according to a second embodiment of the present application has a first surface and a second surface, and a through hole that connects the first surface and the second surface is formed. A radio circuit board on which a radio antenna connector that covers both one surface and / or the second surface is mounted, wherein the radio antenna connector has a predetermined impedance characteristic and is In order to transmit a radio signal between the surface and the second surface, a conductor extending to a length equal to or greater than the thickness of the wireless circuit board on which the wireless antenna connector is mounted is provided.

  According to the present invention, impedance matching can be achieved with a simple configuration, and a radio signal can be extracted from any surface of the substrate, increasing the degree of freedom in radio system inspection and radio system design. There is an effect that can be. Specifically, by extending the connector pin of the wireless antenna connector to the surface opposite to the surface on which the wireless circuit is arranged on the substrate, impedance matching is greatly facilitated compared to the case using VIA or through holes. be able to. Furthermore, since the structure is simple, there is an effect that the yield can be increased in manufacturing.

Embodiments according to the present invention will be described below with reference to the drawings.
[Example 1]
[Radio antenna connector layout]

FIG. 1 is a layout view of a radio antenna connector 103 according to the present invention on a radio circuit board 101. The wireless circuit device 105 controls the basic functions of the wireless function, and performs a process necessary for modulation, spread spectrum, and other wireless communication to generate a wireless signal. The line 107 is a conductor that connects between the radio circuit device 105 and the radio antenna connector 103. The hole 109 is a hole that penetrates the front surface and the back surface of the wireless circuit board 101 and is merely a physical through hole. For convenience of explanation, on the wireless circuit board 101, the surface on which the wireless circuit device 105 is disposed is referred to as the front surface, and the opposite surface is referred to as the back surface.
[Wireless antenna connector]

FIG. 2 is a view of the wireless antenna connector 103 as viewed from the upper surface and the lower surface. Referring to the top and bottom views, radio antenna connector 103 is disposed at substantially the center and is connected to radio circuit device 105 and is capable of transmitting radio signals. A connector exterior terminal 203 connected to the conductor and an insulator (for example, a liquid crystal polymer) that electrically separates the two are configured. Therefore, as is apparent from FIG. 2, the terminal 205 is connected to the line 107 of the wireless circuit board 101, and the terminal 207 is connected to the ground conductor.
[Schematic of mounting side of wireless antenna connector]

  FIG. 3 is a schematic view when the wireless antenna connector 103 according to the present invention is viewed from the side when mounted on the wireless circuit board 101. A radio circuit device 105, a ground conductor 301, a line 107, and a radio antenna connector 103 are provided on the front surface of the radio circuit board 101, and a line 107 is provided on the back surface. For the sake of illustration, the line 107 and the ground conductor 301 are shown with different heights. However, the heights are actually the same and cannot be distinguished from the side. The same applies to other embodiments described later.

  A connector outer terminal 203 of a radio antenna connector 103 to be connected to a radio antenna (not shown) is electrically connected to a ground conductor 301 provided on the surface via a terminal 207 (not shown in FIG. 3). It is fixed. The wireless circuit board 101 is provided with a through hole 109 (not shown), and the connector pin 201 of the wireless antenna connector 103 connected to the terminal 205 (not shown in FIG. 3) is inserted into this through hole. The connector pin 201 is a conductor that is connected to the line 107 and transmits a signal from the wireless circuit device 105. As is apparent from the figure, the connector pin 201 extends toward the back surface of the substrate, penetrates the wireless circuit substrate 101 and protrudes toward the back surface, and is fixed and electrically connected to the line 107. Note that a gap is secured between the connector pin 201 and the wireless circuit board 101 and is in an electrically and physically non-contact state.

With such a configuration, a radio signal from the radio circuit device 105 is transmitted to the connector pin 201 through the line 107, and as a result, the radio circuit is also formed on the back surface without requiring difficult impedance matching by VIA or a through hole. A signal from the device 105 can be taken out. The reason why the impedance matching is not required here is that the impedance characteristic of the connector pin 201 penetrating the wireless circuit board 101 is determined in advance, and there is a variation in the impedance characteristic for each board as seen in the VIA and the through hole. Based on the fact that there are very few.
[Example 2]

  In the first embodiment, the connector exterior terminal 203 is provided on the surface side on which the wireless circuit device 105 is arranged. However, as shown in FIG. 4, the connector exterior terminal 203 can be provided on the back surface. Of course, it is possible to extract a radio signal at both ends of the connector pin 201 as in the first embodiment.

With such a configuration, the connector exterior terminal 203 can be provided on the opposite side of the wireless circuit device 105 without requiring difficult impedance matching by VIA or through-hole, and the surface on which the wireless circuit device 105 is mounted. It is also possible to take out radio signals with odors.
[Example 3]

  As shown in FIG. 5, connector exterior terminals 203 can be provided on both surfaces of the wireless circuit board 101. Of course, the radio circuit device 105 may be on any surface, and radio signals can be taken out on both sides of the radio circuit board 101 through the connector pins 201.

With such a configuration, it is possible to connect the radio antenna to both surfaces of the radio circuit board 101 without requiring difficult impedance matching by VIA or through-hole.

Wireless antenna connector layout Top view and bottom view of wireless antenna connector Schematic of the side which mounted the connector for radio antennas of Example 1. Schematic of the side which mounted the connector for wireless antennas of Example 2 Schematic of the side surface which mounted the connector for wireless antennas of Example 3

101 wireless circuit board 201 connector pin 203 connector exterior terminal

Claims (2)

A radio antenna connector for transmitting a radio signal on a board to a radio antenna, the radio antenna connector having a predetermined impedance characteristic, and transmitting a radio signal between the front and back of the board, A radio antenna connector, comprising: a conductor extending to a length equal to or greater than a thickness of a substrate on which the radio antenna connector is mounted. A through hole having a first surface and a second surface and connecting the first surface and the second surface is formed, and both or one of the first surface and the second surface of the through hole are formed. A radio circuit board on which a connector for a radio antenna covering the end face of the radio circuit board is mounted,
The wireless antenna connector has a predetermined impedance characteristic, and the wireless antenna connector is mounted in order to transmit a wireless signal between the first surface and the second surface. A wireless circuit board comprising a conductor extended to a length equal to or greater than a thickness of the circuit board.