JPS6348994Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an antenna coupler, and particularly to an antenna coupler in which a variable reactance member provided in a matching circuit is controlled by a motor.

[Conventional technology]

As shown in FIG. 1, a conventional antenna coupler 3 is comprised of an SWR detection circuit 4, a matching circuit 7, a motor drive circuit 5, and a motor 6.
The high frequency transmission power input from the transmission final stage section 2 to the terminal 3a is transmitted to the SWR detection circuit 4, the matching circuit 7, and the terminal 3.
The signal is sent to the antenna 8 via b. The matching circuit 7 is provided with a variable reactance member 7a such as a variable capacitor or variable impedance, and the motor drive circuit operates according to the SWR detection signal from the SWR detection circuit 4 to rotate the motor 6 in the forward or reverse direction. When the motor 6 rotates forward or reverse, the variable reactance member 7a is controlled.
The impedance between the transmission final stage section 2 and the antenna 8 is matched by control. Once alignment is complete
The SWR detection signal from the SWR detection circuit 4 becomes zero, and the motor 6 stops.

The conventional antenna coupler 3 described above is supplied with power from the external power supply circuit 1 for the motor (DC motor or servo motor) that controls the variable reactance member 7a and the motor drive circuit 5 that drives the motor. In addition, the main path member related to the high frequency transmission power of the antenna coupler 3 is large and the terminal 3
A and 3b are also formed to accommodate this large member.

[The problem that the idea aims to solve]

However, the members used for the motor drive circuit 5 and the like and the motor consume less power, and the terminal 3c can be small. Therefore, special design requirements must be met regarding the wiring from the external power supply circuit 1 to the terminal 3a using a wire type different from that of the main route, and the mounting method of the terminal 3c having a different shape from the terminals 3a and 3b of the main route. It has some drawbacks. A method has also been proposed in which the power source used in the antenna coupler 3 is superimposed on the high-frequency transmission power and transmitted using the center conductor of the coaxial cable that connects the terminal 3a of the antenna coupler 3 and the transmission final stage section 2. However, the scope of application is limited because the method of engagement with circuits related to high-frequency transmission power on the power transmitting side and the power receiving side is complicated.

[Means to solve the problem]

This invention was developed in view of the above points,
This product provides an antenna coupler that has a built-in power supply circuit and removes the external power line. A part of the high-frequency transmission output is taken out by a coil, full-wave rectified, and converted into a DC constant voltage. It is configured to be used as a motor power source for adjustment.

〔Example〕

One embodiment of the present invention is explained in Figure 2.

9 is a power supply circuit for adjusting the antenna coupler of the present invention. A power supply side terminal 9a of the power supply circuit 9 is connected to a terminal 3a of the antenna coupler 3. The high frequency transmission power inputted from the power supply terminal 9a is converted into a DC power supply and is supplied to a load circuit such as the motor drive circuit 5 via the load side terminal 9b.

The high-frequency transmission power input from the power supply terminal 9a is induced by the coil 10 and connected to the collector C of the transistor 19 via a full-wave rectifier consisting of rectifying diodes 11, 12, 13, and 14 and a smoothing capacitor 15. be done.

The collector C is grounded via the capacitor 16, and is also connected to the connection point between the base B and the constant voltage diode 20, and the constant voltage diode 20 is grounded.

The emitter E is connected to the load side terminal 9b and also grounded via the capacitor 17.

The load side terminal 9b is connected to the motor drive circuit 5.

Here, when the high frequency transmission power is sent from the transmission final stage section 2 to the antenna 8 via the antenna coupler 3, the SWR detection circuit 4, the motor drive circuit 5,
The motor 6 and matching circuit 7 cooperate to start tuning. During tuning, the high frequency transmission power is slightly affected by the current related to the motor 6, but when tuning is completed and the motor 6 stops, there is no load. Therefore, the loss related to the power supply circuit 9 is negligible.

[Effect of idea]

Since the antenna coupler according to the present invention is configured to obtain an internal power source by converting high frequency transmission power, the antenna coupler has a feature that the power source for driving the variable reactance member can be built into the antenna coupler. Therefore, there is an advantage that wiring from an external power supply circuit or the like can be omitted.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional antenna coupler, and FIG. 2 is a block diagram including a partial circuit diagram showing one embodiment of the antenna coupler according to the present invention. 1... external power supply circuit, 2... transmission final stage, 3...
...Antenna coupler, 4...SWR detection circuit, 5
......Motor drive circuit, 6...Motor, 7...
... matching circuit, 8... antenna, 9... power supply circuit,
10...coil, 11, 12, 13, 14...rectifier diodes, 15, 16, 17...capacitor, 18...resistor.

Claims (1)

[Scope of utility model registration request] An antenna coupler comprising a matching circuit 7 made of a variable reactance member that matches impedance between the transmission final stage section 2 and the antenna 8, and a motor 6 that controls the reactance member according to the matching, the transmission final stage described above. 2 and a terminal 3a of the antenna coupler 3, and the terminal 3a is connected to the coil 9.
The output side of the coil 9 is connected to a transistor 18 via a full-wave rectifier consisting of rectifying diodes 10, 11, 12, and 13 and a smoothing capacitor 14.
The collector C is connected to the collector C of the resistor 17.
and a capacitor 15 are connected in series and grounded, and the base B of the transistor 18 is connected to a constant voltage diode 19.
and ground through resistor 17 and capacitor 1.
5, and the emitter E of the transistor 18 is grounded via the capacitor 16, and the power supply circuit 9 is configured so as to be connected to the motor drive circuit 5 via the load side terminal 8b. An antenna coupler characterized in that high frequency transmission power from a termination section 2 is supplied to a power supply circuit 9, and a constant voltage is applied from the power supply circuit 9 to a motor drive circuit 5.