JPS62219821A - High frequency signal connection device - Google Patents

Abstract

PURPOSE:To simplify the connection external device of an without deteriorating the high frequency characteristic by providing a high frequency signal transmission pattern to one face of a copper clad laminated board mounted to a metallic case and a signal transmission pattern to the rear face and connecting both ends of the high frequency signal transmission pattern to an unbalanced coaxial plug provided to the metallic case. CONSTITUTION:Unbalanced coaxial plugs 1, 5 and a copper clad laminated board 3 are fitted to the case 2. The copper clad laminated board 3 is a both- side printed board and a high frequency grounding pattern 6 is provided to the rear side opposed to the front pattern 4. In selecting properly the conductor width of the pattern 4, a signal transmission line with excellent high frequency characteristic designed to the specific signal transmission impedance is formed. A high frequency signal connection device is formed to the part of the circuit unit. Thus, other circuit components are soldered simultaneously to the unbalanced coaxial plug fitted to the metallic case on the board, the connection with excellent high frequency characteristic is applied without long connection wiring and manual soldering. In case of the unit connection, the high frequency shield effect with external or internal other circuits is improved.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a high frequency signal connection device.

2. Description of the Related Art A conventional high frequency signal connection device uses a high frequency coaxial couple and has a structure in which the connection is directly soldered to a signal connection plug.

Hereinafter, a high frequency signal connection in an indoor receiver for receiving satellite broadcasting will be explained based on the drawings.

The satellite broadcasting receiving system has an antenna 7 as shown in Figure 3.
The signal from the satellite is received by the microwave down converter 8, and the υHF band w! is used for reception by the indoor receiver. J1 intermediate frequency signal and guided to the indoor receiver 1o via the coaxial cable 9.

The indoor receiver 10 has a configuration as shown in FIG. 4, and a high-frequency signal is input to the indoor receiver high-frequency signal input terminal 12 via a coaxial cable 9f, and a signal from the channel selection control circuit 19 is input to receive the desired channel. The control signal is the channel selection circuit 18
A frequency conversion circuit 130 that converts the first intermediate frequency signal into a second intermediate frequency signal controls the local oscillation frequency, and is taken out from the terminal 14 as the second intermediate frequency signal.

Terminal 16 serves as a second intermediate frequency input terminal for satellite broadcasting FM.
The modulated signal is input to the demodulation circuit 17, and is reproduced as a video and audio signal by the television receiver 11 in FIG. 3 via the video and audio signal processing circuit 2o.

In FIG. 4, terminals 14 and 16 are connected to the US C band (3
, 7 to 4.2 GHz) In the case of satellite signal reception, this microwave band is also used as a signal for terrestrial microwave communication, and in order to reduce interference caused by this signal, a filter for eliminating interference is installed between the input and output of the second intermediate frequency. The device is often used, and the terminals 14 and 16 are attached to the housing of the receiver, and the filter device 15 is attached from the outside. In areas where these interferences do not occur, the terminals 14 and 16 are directly connected using coaxial cables. In such an indoor receiver, the signal connection terminals 12° and 14
and 16, circuits 13, 17, and 18 are several 1oOMHz
Processing is performed using high frequency signals close to ~2000 MHz, signal connections are complicated, and high frequency characteristics must be fully satisfied.

FIG. 6 shows an example of high frequency signal connection in a conventional example.

The output of the frequency converter unit 31 for converting the indoor first intermediate frequency signal for satellite broadcasting into the second intermediate frequency signal is installed in the housing 30 for the indoor receiver as shown in FIG.
It is soldered to the unbalanced coaxial connector 33 via the connector.

Furthermore, an unbalanced coaxial plug 36 attached to the housing 30
A coaxial cable 37 connected to is connected to a demodulation circuit board 38. Either an interference removal filter device 34 or a signal connection cable 35 is connected to the plugs 33 and 36.

Problems to be Solved by the Invention In this conventional method, the coaxial cable is manually soldered directly to the connector attached to the housing, which deteriorates high frequency characteristics and is particularly problematic for satellite broadcast receivers. Various oscillations built into the receiver may occur due to deterioration of the voltage standing wave ratio of the signal processing circuit and connection cable, which directly affects phase distortion, which is an important characteristic, or due to insufficient high frequency shielding.

This has the drawback of causing problems such as unnecessary signal radiation from the circuit or signal intrusion from external equipment.

The present invention solves the above problems by using the shortest coaxial connection couple without directly manual soldering of the coaxial couple, and by connecting external equipment in electronic equipment without deteriorating the high frequency characteristics. The purpose is to provide a high frequency signal connection device that can be easily connected.

Means for Solving the Problem In order to solve this problem, the present invention mounts a copper-clad laminate board in a metal casing, and has a pattern for high-frequency signal transmission on one side of the board and a pattern for signal transmission on the back side. A pattern for transmitting a high frequency signal is provided, and both ends of the pattern for high frequency signal transmission are connected to an unbalanced coaxial plug provided in a metal casing.

The present invention has the above-described configuration, which makes the connection cable as short as possible, and allows the strip line with a specific impedance formed on a structurally stable copper-clad laminate board to be soldered using a solder dip. This makes it possible to connect the cable length and the voltage standing wave ratio (VSWR) at the connection between the plug and the connecting cable without deteriorating it, and also allows it to be connected inside a metal casing as part of a high-frequency circuit unit. , can increase the shield effect.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, unbalanced coaxial plugs 7 and 6 and a copper-clad laminate board 3 are attached to a housing 2. The copper-clad laminate board 3 is the first
A double-sided printed circuit board is used as shown in the cross-sectional view of the figure.
A high frequency grounding pattern 6 is provided on the back surface opposite to the pattern 4 on the front surface. At this time, by appropriately selecting the pattern conductor width, pattern 4 can create a signal transmission path with good high frequency characteristics designed for a specific signal transmission impedance, and connect high frequency signals to a part of the circuit unit. The device can be realized.

An explanation will be given based on an embodiment of an indoor receiver for satellite reception with reference to FIG.

In FIG. 2, the second intermediate frequency signal of the output of the frequency converter unit 21 converts the first intermediate frequency signal into the second intermediate frequency signal.
The intermediate frequency signal is guided to a high frequency unit 23 via a high frequency coaxial cable 22.
It has a microstripline signal transmission pattern as shown in Figure 1, and also has a high-frequency circuit such as a Bliss filter circuit for frequency synthesizer tuning, a PLL circuit, etc. in the same metal casing, for example, in a satellite receiver. Built-in.

The signal output terminal of the high frequency unit 23, including the input terminal plug of the frequency converter unit 21, is attached to the receiver metal casing and is used as an external connection terminal.

Further, the second intermediate frequency signal is a satellite broadcasting FM modulation signal iFM.
The signal is applied to the connection plug attached to the demodulating unit 26. Since this FM demodulation unit is also attached to the receiver housing, each unit 21.degree. 23.26 is attached integrally by a motherboard 27. In addition, 24 is an interference elimination filter device, and 25 is a signal connection cable.

In this case, the interference rejection filter 24 connected from the outside
Alternatively, the connection cable 26 can be directly connected to the plug attached to the housing of each unit, and there is no need to manually solder the connection cable to the plug as described in the conventional example. , fluctuations in high frequency characteristics due to differences in soldering work, impedance characteristics, especially voltage standing wave ratio (
VSWR) will not deteriorate. Further, it is possible to obtain the effect of exhibiting an effect on high frequency shielding properties.

Effects of the Invention As described above, according to the present invention, a double-sided printed wiring board is used as a board for mounting a high-frequency circuit unit, a signal transmission pattern of a microstrip line configuration is formed in a part of the high-frequency circuit, and a metal casing is mounted. Simultaneously solder other circuit components on the board to the unbalanced coaxial connector attached to the body, and use it as an effective means as a high-frequency connection device for external connection of electronic equipment, and use it to route long connection cables. It is possible to connect high-frequency signals with excellent high-frequency characteristics without the need for manual soldering. Furthermore, when connecting each unit, it is possible to obtain the effect of increasing the high frequency shielding effect with other external or internal circuits.

[Brief explanation of the drawing]

Figures 1a and b are a plan view and a sectional view of a high-frequency signal connection device of the present invention, Figure 2 is a perspective view of a main part of an electronic device embodiment using the connection device of the present invention, and Figure 3 is a satellite broadcasting device. FIG. 4 is a block diagram of an indoor receiver for receiving satellite broadcasting, and FIG. 5 is a perspective view of main parts showing an example of high frequency signal connection in electronic equipment. 1.6... Unbalanced coaxial plug, 2...
Housing, 3... Copper-clad laminate board, 4... Surface pattern, 6... High frequency grounding pattern. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure (b) Takama; Kinba Kazuya Bagoon Figure 2 $5

Claims (1)

[Claims] A copper-clad laminated board is mounted on a metal casing, a pattern for high-frequency signal transmission is provided on one side of the copper-clad laminated board, and a high-frequency grounding pattern is provided on the back side facing the signal pattern, and the high-frequency signal is transmitted. A high frequency signal connection device, characterized in that both ends of the pattern are connected to unbalanced coaxial plugs provided in the metal casing.