JPH0650823B2 - High frequency signal connection device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a high frequency signal connection device.

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

Hereinafter, a high frequency signal connection in an indoor receiver for satellite broadcast reception will be described as an example with reference to the drawings.

The satellite broadcasting receiving system has an antenna 7 as shown in FIG.
The signal from the satellite is received by the microwave down converter 8 and converted into the first intermediate frequency signal in the UHF band for reception of the indoor receiver, and is guided to the indoor receiver 10 via the coaxial cable 9. The indoor receiver 10 is configured as shown in FIG. 4, and is input to the indoor receiver high-frequency signal input terminal 12 via the coaxial cable 9 and is received from the tuning control circuit 19 for receiving a desired channel. The control signal passes through the tuning circuit 18 and outputs the first intermediate frequency signal to the second intermediate frequency signal.
The local oscillation frequency of the frequency conversion circuit 13 for converting into the intermediate frequency signal is controlled, and the second intermediate frequency signal is taken out from the terminal 14.

Terminal 16 serves as a second intermediate frequency input terminal for satellite broadcasting FM.
The signal is input to the modulation signal demodulation circuit 17, and reproduced as a video and audio signal through the video and audio signal processing circuit 20 on the television receiver 11 in FIG.

In FIG. 4, terminals 14 and 16 are also used as signals for terrestrial microwave communication in this microwave band in the case of receiving US C-band (3.7 to 4.2 GHz) satellite signals, thus reducing interference by these signals. Therefore, the interference elimination filter device is often used between the second intermediate frequency input and output, 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 the area where these interferences do not occur, the terminals 14 and 16 are directly connected by the coaxial cable. In such an indoor receiver, the signal connection terminals 12, 14
And 16, the circuit 13,17,18 few 100 MHz _z to 2
Treated with near frequency signal to 000MH _z, the signal connection is complex, it is necessary to further satisfactory high frequency characteristics.

FIG. 5 shows a high-frequency signal connection embodiment in the conventional example.

The output of the frequency converter unit 31 for converting the first intermediate frequency signal for satellite broadcasting indoors explained in FIG. 4 into the second intermediate frequency signal in the housing 30 for the indoor receiver is the coaxial cable 32.
Via, and is soldered to the unbalanced coaxial connector 33.
Further, the unbalanced coaxial connector 36 attached to the housing 30.
The coaxial cable 37 connected to is connected to the demodulation circuit board 38. Either the interference elimination filter device 34 or the signal connecting cable 35 is connected to the plugs 33 and 36.

Problems to be Solved by the Invention In such a conventional method, the coaxial cable is soldered by hand directly to the connector attached to the housing, which deteriorates the high-frequency characteristics and is particularly important in satellite receivers. The voltage standing wave ratio including the signal processing circuit and the connecting cable that directly affect the phase distortion is deteriorated and the high frequency shield becomes insufficient. There is a drawback that problems such as unnecessary signal radiation or jumping in of a signal from an external device occur.

The present invention is to solve the above problems, without directly manually soldering the coaxial cable, using the shortest coaxial connection cable, without deteriorating the high frequency characteristics of the external device connection in the electronic device, It is an object of the present invention to provide a high frequency signal connection device that can be easily connected.

Means for Solving the Problems In order to solve this problem, the present invention mounts a copper clad laminated board on a metal housing, and a pattern for high-frequency signal transmission on one side of the board and signal transmission on the back side. And an unbalanced coaxial connector provided in the metal casing is connected to both ends of the pattern for high frequency signal transmission.

Effect The present invention has the above-described configuration, which allows the connection cable to be the shortest, and enables the strip line having a specific impedance formed on the structurally stable copper-clad laminated substrate and the unbalanced coaxial connector to be soldered by the solder dip. , The cable length and the voltage standing wave ratio (VSWR) at the connection part between the plug and the connection cable are not deteriorated, and the shielding effect is achieved because the connection method is performed in the metal housing as a part of the high frequency circuit unit. Can be raised.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the unbalanced coaxial connectors 1 and 5 and the copper-clad laminated substrate 3 are attached to the housing 2. The copper clad laminate 3 is the first
Using a double-sided printed circuit board as shown in the sectional view of Figure b,
A high frequency ground pattern 6 is provided on the back surface facing the pattern 4 on the front surface. At this time, by appropriately selecting the pattern conductor width for the pattern 4, it is possible to form a signal transmission path having good high frequency characteristics designed to have a specific signal transmission impedance, and a high frequency signal connection device is provided in a part of the circuit unit. realizable.

FIG. 2 will be described based on an embodiment of an indoor receiver for satellite reception.

In FIG. 2, the second output of the frequency converter unit 21 for converting the first intermediate frequency signal into the second intermediate frequency signal is output.
The intermediate frequency signal is guided to a high frequency unit 23 by a high frequency coaxial cable 22. The high frequency unit 23 has a signal transmission pattern by a microstrip line as shown in FIG. 1 and, for example, a frequency synthesizer selected as a high frequency circuit in a satellite receiver. High frequency circuits such as a prescaler circuit and a PLL circuit for a station are built in the same metal housing.

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

Also, the second intermediate frequency signal is a satellite broadcast FM modulated signal
It is applied to a connecting plug attached to the demodulating unit 26. Since this FM demodulation unit is also attached to the receiver casing, the units 21, 23 and 26 are integrally attached by the mother board 27. Incidentally, 24 is an interference elimination filter device, and 25 is a signal connecting cable.

In this case, the interference elimination filter 24 connected from the outside
Alternatively, the connecting cable 25 can be directly connected to the connector attached to the housing of each unit, and further, the connecting cable described in the conventional example does not need to be manually soldered to the connector. Also, there is no possibility of causing fluctuations in high-frequency characteristics due to differences in soldering work and deterioration in impedance characteristics, particularly the voltage standing wave ratio (VSWR). In addition, it is possible to obtain an effect that the effect can be exerted on the high frequency shield characteristic.

As described above, according to the present invention, a double-sided laminated printed wiring board is used as a substrate for mounting a high frequency circuit unit, a signal transmission pattern of a microstrip line configuration is formed on a part of a high frequency circuit, and a metal casing is used. At the same time, the unbalanced coaxial connector attached to the body is soldered to other circuit components on the board at the same time, and it becomes an effective means as a high-frequency connection device for external connection of electronic devices, without having to run the connection cable for a long time. High-frequency signal connection with excellent high-frequency characteristics is possible without the need for manual soldering. Further, when connecting each unit, it is possible to obtain an effect that a high-frequency shield effect with other external or internal circuits can be enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b are a plan view of a high-frequency signal connection device and a cross-sectional view of the connection device of the present invention, and FIG. 2 is a perspective view of essential parts of an electronic device embodiment using the connection device of the present invention. 3, FIG. 3 is a conceptual diagram showing an example of a satellite broadcast receiving system, FIG. 4 is a block diagram of an indoor receiver for satellite broadcast receiving, and FIG. 5 is a perspective view of essential parts showing an embodiment of high-frequency signal connection in electronic equipment. is there. 1, 5 ... Unbalanced coaxial connector, 2 ... Housing, 3 ... Copper clad laminated substrate, 4 ... Surface pattern, 6 ... High frequency ground pattern.

Claims (1)

[Claims] 1. A copper clad laminate is mounted on a metal housing, and a pattern for high frequency signal transmission is provided on one surface of the copper clad laminate.
A high-frequency grounding pattern is provided on a surface of the back surface facing the signal pattern, and both ends of the pattern for transmitting the high-frequency signal are connected to an unbalanced coaxial connector provided on the metal casing. Signal connection device.