JPS6018021A - Antenna coupler - Google Patents

Abstract

PURPOSE:To simplify the structure of a signal extracting part and at the same time to obtain a general-purpose IC by providing a frequency counting means for transmission power and changing the reactance in accordance with the counted frequency. CONSTITUTION:A matching circuit 9 serves as a reactance circuit network containing three pairs of variable reactance circuits. Each of the reactance circuits consists of capacitors 3 and 4 and a coil 5. The transmission power is sent to an antenna 7 from a transmitter 1 via an antenna coupler 8 through a channel of a comparatively high transmission/reception frequency band. Thus the output terminal D1 of a latch circuit 19 is set at H level in response to the count value of a counter 17 of a frequency counter 10. Then a switch S1 is actuated. Therefore a reference potential point (earth) is connected to the terminal L1 of the circuit 9. Thus the inductance of a coil 5 is reduced and the antenna 7 of the transmitter 1 is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antenna coupler, and more particularly to an antenna coupler that automatically matches a transmitter and an antenna in accordance with the frequency of transmission power.

A conventional antenna coupler is provided between a transmitter 1 and an antenna 7 as shown in FIG. 1, and matches the output impedance of the transmitter 1 and the impedance of the antenna 7. This is achieved by modifying the reactance with matched beam actance elements 3, 4 and 5. In order to transform the desired glue actance, for example, a terminal Ln (n is 1, 2,
) on the rotary switch 6 (n is 1°2...) and the reference potential point (
(ground). The reactance network is comprised of multiple variable reactance circuit sections.

The variable reactance circuit portion is formed of a member such as a barrier pull capacitor, a coil with a center tap, a plurality of capacitors, or a plurality of coils, and is subjected to mechanical control. In some cases, a variable reactance circuit portion is formed using a variable capacitance diode or the like to perform electrical control. Note that if a semi-fixed reactance element such as a trimmer capacitor is provided in the variable reactance circuit portion, the reactance may be adjusted separately from the above control. To obtain a wide connection range, create a reactance network with three or more sets of variable reactance circuit parts.
- organize and preswage one set of variable reactance circuit sections and control two other sets of variable reactance circuit sections; The actual 11 control methods are determined from elements such as the signal source to be handled, load, structure, Q, size, price, etc. Control can be done manually or automatically.

In order to automatically control the above-mentioned antenna coupler' ([:), a circuit for extracting the information necessary for f-range control and a means for converting the information into a signal suitable for mechanical processing, such as operating a relay, are required. Most conventional antenna couplers use SWR as control information, and the detection circuit has a simple configuration of 1111, but it is compatible with the system (electrical or mechanical) and type (relay, motor, switching device) of the controlled system. It has serious drawbacks.

The present invention is based on the above-mentioned one hit point, and uses the transmission ', 1 to detect the frequency of the force and use it as matching information, and to process this matching information using a versatile integrated circuit. The overall purpose is to provide a customized antenna.

The present invention has a structure in which a frequency counting means for counting the frequency of the transmitted power is provided, and the actance is changed to correspond to the frequency obtained by measurement.

Hereinafter, a second embodiment of the antenna coupler according to the present invention will be described.
The details will be explained according to the figures.

In FIG. 2, 8 is the antenna cup 2.

The antenna cup 28 has a matching circuit 92 and a frequency counter 10.
and a switch sn (where n is 1, 2, . . . ).

The matching circuit 9 is a reactance network consisting of three sets of variable reactance circuit parts, capacitors 3 and 4, respectively.
and a coil 5. The coil 5 has a plurality of intermediate taps, and each intermediate tap is connected to the terminal L11.
It is connected to 1, 2...

The frequency counter 10 is connected to the antenna cup 28 from the transmitter 1.
The voltage of the transmission 'En force inputted to the terminal 8a of the terminal 10 is
The voltage is divided by the r piper resistors 11 and 12 via a'li and output to the amplifier 13. The amplifier 13 generates a count pulse according to the frequency of the divided transmission power and outputs it to one input side of the dart AND circuit 14. The dart AND circuit 14 remains active while receiving the dirt signal φ at the other input side, and passes the count pulse input to one input side. The counter 17 counts the number of count pulses input from the gate AND circuit 14. The reset pulse generating circuit 15 generates a reset pulse and sends it to the counter 17 when the dirt signal φ falls. When the counter 17 receives a reset noggle from the reset pulse generation circuit 15, the count value is sent to the latch circuit 1 via the decoder 18.
9 and returns to zero. The latch circuit 19 operates one of the switches S1 to Sn in accordance with the latched information. The switches Sl to Sn connect the reference potential point (earth) to i of the matching circuit 9 via normally open contacts that are closed by operation.
Connect to children L1 to Ln.

Output terminal D1yD of latch circuit 19! ... connected to the switch S1, S2... and another switch s1' in parallel.
, s2' . . . (not shown), other variable reactance circuit sections provided in the intermediate circuit 9 can be controlled simultaneously. The frequency range corresponding to the output terminals D1+D2... is determined as appropriate.

The constant of the variable reactance circuit portion (the coil 5 in the embodiment) which is controlled by the switch S1+S2 is determined by considering the matching operation and filter effect. The variable reactance circuit portion to be controlled may have a circuit configuration using a capacitor. The switches S1+s2... may be formed of a solid piece such as a half-body.

When the variable actance circuit part is a Noriappu capacitor or a parallel L, the count value of the counter 17 is converted to a digital-to-analog converter and controlled by a motor or the like.

Here, when transmitting power is sent from the transmitter 1 to the antenna 7 via the antenna coupler 8 on a channel with a relatively high transmitting/receiving frequency band, the counter 17 of the frequency counter 10
When the output terminal D.1 of the latch circuit 19 corresponding to the count value becomes H level, the switch S1 operates. Therefore, the terminal L of the matching circuit 9! A reference potential point (earth) is connected to , the inductance of the coil 5 is reduced, and the antenna 7 of the transmitter is matched.

The antenna coupler according to the present invention includes one frequency counting stage for counting the frequency of the transmitted power, actance transforming means for responding to the numerical value counted by the wave number counting means and transforming the actance, and reactance transforming means. Since the configuration is fully equipped with a matching circuit that matches the transmitter and antenna using reactance, the signal extraction part is simplified, and it is versatile and does not require high-precision operating characteristics. It has the feature that a circuit can be formed using a certain integrated circuit. Therefore, there is an effect that the control system circuit can be made smaller than the conventional one.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional antenna coupler, and FIG. 2 is a block diagram of an antenna coupler according to the present invention.
It is a lock diagram. Symbols in the figure: 1 is a transmitter, 2 and 8 are antenna couplers, 3 and 4 are capacitors, 5 is a coil,
6 is a rotary switch, 7 is an antenna, 9 is a matching circuit,
10 is a frequency counter, 11°, 12 is a resistor, 13 is an amplifier, 14 is an AND circuit for dirt, 15 is a reset pulse generation circuit 1.16 is a latch pulse generation circuit, 17
is a counter, 18 is a decoder, 19 is a latch circuit, 81
~Sn is a switch. Patent applicant Yaesu Musen Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] 1. A transmitter that uses a frequency counting means for counting the frequency of the transmitted power, an actance transformation means for corresponding to the numerical value counted by the frequency counting means, and an actance transformation means, and a reactance transformed by the reactance transformation means. and a matching circuit for matching between the antenna and the antenna, and the antenna coupler is configured to transform the reactance according to the frequency of the transmitted power.