JPH0681148U - High frequency unit - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] High frequency output terminal RFOUT and ground terminal GN
By providing D as a coaxial structure rather than as a coaxial structure, the characteristic impedance of the high-frequency output terminal is brought closer to the characteristic impedance of the antenna input section, and a high-frequency unit capable of obtaining a good connection state is provided. [Structure] The case C has antenna terminals 1 and 2, a power supply terminal + B, a high frequency output terminal RFOUT, and an earth terminal GN.
In the high-frequency unit in which D and the high-frequency output terminal are connected to the antenna terminal and each terminal is connected to the terminal of the printed board P, adjacent to the terminal to which the high-frequency output terminal 5 of the printed board is connected. Two
The above-mentioned ground terminals 6 and 7 are arranged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high frequency unit such as an RF switch, an RF distributor, an RF amplifier, and an RF branching device used in AV equipment such as a VTR and a video disc player, and communication equipment such as a transceiver.

[0002]

[Prior art]

 Generally, in the conventional high frequency unit as described above, as shown in FIGS. 4 and 5, connectors having a coaxial structure are used for the input units 3 and 4 of the high frequency signals from the antennas 1 and 2, and the power supply unit is used. Terminals which are connected to the terminals 8, 6 and 5 of the printed circuit board P by soldering are used as + B, the ground terminal GND, and the high frequency signal output terminal RFOUT.

Therefore, in the structure of the conventional high-frequency unit, as shown in FIG. 5, only one ground terminal GND is provided in addition to the high-frequency output terminal RFOUT, so that the inputs of the antennas 1 and 2 are input. The characteristic impedance of the high frequency output part deviates from 75Ω with respect to the characteristic impedance of parts 3 and 4 (for example, 75Ω). There is a problem that passage loss occurs. Most of the reasons why the characteristic impedance deviates from 75Ω in this way are that the high frequency output terminal RFOUT and the ground terminal GND are not in the coaxial structure.

Therefore, if the high-frequency output terminal RFOUT and the ground terminal GND are made to have a coaxial structure, the above problems can be almost solved, but if the coaxial structure is actually used, not only the unit becomes large, but also the unit becomes large. However, there are problems such as high cost, and it is not a solution.

[0005]

[Problems to be solved by the device]

 In view of the above-mentioned conventional technique, the present invention does not make the high frequency output terminal RFOUT and the ground terminal GND have a coaxial structure, but brings them close to the coaxial structure as much as possible, so that the characteristic impedance of the high frequency output terminal can be improved. It is an object of the present invention to provide a high frequency unit that can obtain a good connection state by approaching the characteristic impedance of the above.

[0006]

[Means for Solving the Problems]

 The present invention has been made for the purpose of solving the above-mentioned problems, and its structure is such that an antenna terminal, a power supply terminal, a high frequency output terminal, and an earth terminal are incorporated in a case, Is connected to the antenna terminals, and each terminal is connected to the terminals on the printed board. In a high-frequency unit, arrange two or more ground terminals adjacent to the terminals connecting the high-frequency output terminals on the printed circuit board. It is characterized by what has been done.

That is, the inventor of the present invention, as a result of repeated research aiming at solving the above-mentioned problems, has found that the terminal is placed adjacent to the terminal for connecting the high-frequency output terminal on the printed circuit board and the terminal is pinched. Or, if at least two or more ground terminals are arranged so as to surround it, the impedance becomes close to the above-mentioned coaxial structure, and the impedance of the high-frequency output terminal section becomes the input section of the high-frequency signal coming from the antenna. We realized that we can approach impedance and completed the present invention.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a high frequency unit of the present invention, FIG. 2 is a plan view showing an example of an arrangement of terminals on a printed circuit board, and FIG. 3 is a plan view showing another example.

In the figure, C is a shield case, which is an input section 3 and 4 for inputting signals from the antennas 1 and 2, and a high frequency output terminal for receiving and outputting signals from these input sections 3 and 4. RFOUT, two ground terminals GND provided so as to sandwich the RFOUT, and a power supply terminal + B are incorporated to form a high frequency unit according to an example of the present invention. In this high frequency unit, a case C is attached to a printed circuit board P, and the high frequency output terminal RFOUT, two ground terminals GND and a power supply terminal + B are provided on the printed circuit board P and corresponding terminals 5 are provided. , 6, 7, 8 are connected by soldering.

By doing so, it is possible to bring the characteristic impedance of the high frequency output terminal RFOUT close to the characteristic impedance (75Ω) of the input sections 3 and 4 from the antennas 1 and 2, and as a result, The outputs can be matched, the passing loss between the input and output is extremely small, and a good connection state can be obtained. Although two ground terminals GND are provided in the above description, the present invention is not limited to this, and three ground terminals may be provided, or four ground terminals may be provided as shown in FIG. Good. In this case, the terminals 9 and 10 corresponding to the printed circuit board P are provided. Further, it is desirable that the ground terminal is provided so as to sandwich or surround the high frequency output terminal in contrast. In this way, the coaxial structure becomes closer to that in the above case, and a good connection state can be obtained.

[0011]

[Effect of device]

 The present invention is as described above, and in the high frequency unit, since the high frequency output terminals are adjacent to each other and a plurality of ground terminals are provided, the high frequency output terminal and the ground terminal are close to the coaxial structure, and the high frequency output is provided. The characteristic impedance of the terminal can be made close to that of the input part of the signal from the antenna, and a good connection state can be obtained. Therefore, AV equipment such as VTR and video disk player, and a transceiver etc. It is suitable as a high-frequency unit for RF switches, RF distributors, RF amplifiers, RF splitters, etc. used in the communication equipment of

[Brief description of drawings]

FIG. 1 is a schematic view of a high frequency unit according to the present invention.

FIG. 2 is a plan view showing an example of an arrangement of terminals on a printed circuit board.

FIG. 3 is a plan view showing another example of the same.

FIG. 4 is a diagram showing an arrangement of terminals of an RF switch of a conventional high frequency unit.

FIG. 5 is a schematic view of a conventional high frequency unit.

[Explanation of symbols]

1, 2 Antennas 3, 4 Input from the antenna 5 Terminals provided on the printed circuit board to connect the high frequency output terminals 6, 7, 9, 10 Terminals provided on the printed circuit board to connect the ground terminals 8 Power terminals are connected Terminals provided on the printed circuit board GND Ground terminal FROUT High frequency output terminal + B Power supply terminal P Printed circuit board C shield case

Claims (2)

[Scope of utility model registration request] 1. A case, an antenna terminal, a power supply terminal,
In a high-frequency unit in which a high-frequency output terminal and an earth terminal are built in, the high-frequency output terminal is connected to the antenna terminal, and each terminal is connected to the terminal of the printed board, the high-frequency output terminal on the printed board is connected. A high-frequency unit, in which two or more ground terminals are arranged adjacent to each other. 2. The high frequency unit according to claim 1, wherein the ground terminal is incorporated adjacently so as to sandwich or surround the high frequency output terminal.