SU1711323A1 - Device for automatic matching of transmitter with antenna - Google Patents

Abstract

The invention relates to radio engineering. The goal is to increase the coordination accuracy. For this, the signal from transmitter 16, passage through the serially connected directional coupler (BUT) 1 of the incident wave, BUT 2 reflected wave, block 3 of matching elements with controlled parameters and transformer 4 current to antenna 17, branch off BUT 1 and BUT 2 respectively in series connected discrete controlled phase shifter 5 and the first amplifier-limiter (EO) 6 and in the second AO 7. The outputs of the first AO 6 and the second AO 7 are connected respectively to the first and second inputs of the phase detector 3, the output of which is through electronically connected electronic switch 9. Analog-to-digital converter 10 and control signal generator 11 controls the parameters of block 3, the signal from the fourth output of driver 11 controls the parameters of controlled discrete phase rotator 5, the signal from the second output of driver 11 controls the operation of the electronic switch 9, and the signal from the first output of the driver 11 changes the voltage at the output of the controlled voltage divider 12, to the second input of which the reference voltage is applied. The serially connected multiplier 13, DC amplifier (UPT) 14 and low pass filter (LPF) 15 together with the shaper 11 maximize the power in the antenna 17, which improves the matching accuracy, and using phase detection improves noise immunity. 3 ill. / 7 fe

Description

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The invention relates to radio engineering and can be used in radio transmitting devices of wide application.

The purpose of the invention is to improve the accuracy of matching.

Fig. 1 shows a block diagram of a device for automatic matching of a transmitter with an antenna; FIG. 2 shows an example of implementation of a control signal generator; FIG. in FIG. 3, the dependence of the cosine of the phase shift angle on the load resistance.

The device for automatic matching of the transmitter with the antenna contains a directional coupler 1 of the incident wave, a directional coupler 2 of the reflected wave, a block 3 matching elements with controlled parameters, a current transformer 4, a discrete controlled phase shifter 5, the first and second limiting amplifiers b and 7, the phase detector 8, electronic switch 9, analog-to-digital converter 10, driver of control signals 11, controllable voltage divider 12, multiplier 13, direct current amplifier 14, filter 1 5 low frequencies (LPF), the transmitter 16 and the antenna 17.

The device for automatic matching of the transmitter with the antenna operates as follows.

The signal from transmitter 16 through the directional coupler 1 of the incident wave and the directional coupler 2 of the reflected wave, as well as through the block 3 matching elements with controlled parameters, is fed through the primary winding of the current transformer 4 to the antenna 17. The voltage proportional to the level of the incident wave The phase shifter 5 and the first amplifier-limiter 6 are fed to the first input of the phase detector 8. To the second input of the phase detector 8, a signal proportional to the level of the reflected wave is fed through the second limiting amplifier 7. The first and second limiting amplifiers 6 and 7 suppress the pulse interference, which increases the noise immunity of the automatic matching device of the transmitter with the antenna.

The signal from the fourth output of the shaper 11 of the control signals supplied to the control input of the discrete controlled phase shifter 5 can change the phase shift introduced into the path by setting this shift to 0 or 90 °. In the first case, the output voltage of the phase detector 8 is proportional to the cosine of the phase angle of the displacement factor of the load of the unit 3 together with the antenna

17, in the second case - in proportion to the sine of this angle. The signal at the output of the phase detector 8 in the first case carries information about the active load resistance, in the second case carries information about the load reactance.

When setting up the device to automatically match the transmitter with the antenna

The control input of the discrete controlled phase shifter 5 first supplies such a signal from the fourth output of the driver 11, at which the output voltage of the phase detector 8

in proportion to the reactance of the series-connected unit 3 and the antenna 17. In this case, the unit 3 is adjusted to obtain the error voltage at the output of the phase detector 8. equal to zero.

Then, the phase shift of the discrete adjustable phase shifter 5 is changed by a signal from the shaper 11 to a shift that ensures the proportionality of the output voltage of the phase detector 8 to the active resistance of the serially connected unit 3 and the antenna 17. At the same time, the parameters of the unit 3, which determine the active

resistance, to obtain a jump in the output voltage of the phase detector 8, which is shown in FIG. Further, more precise tuning is performed directly on the power sensor, formed in series

connected by a transformer 4, a multiplier 13, a direct current amplifier 14 and a low-pass filter 15. To do this, the output voltage of the low-pass filter 15 is entered through the electronic switch 9 and the analog-digital converter 10 if the voltage is outside the upper or lower limit thresholds UPT 14, the output voltage is controlled

the divider 12 is changed by changing the voltage transfer ratio of the reference voltage by means of the control signal from the driver 11. In this case, the bias voltage of the DCF 14 is changed until then.

until UFT 14 comes out in linear mode.

At the same time, the parameters of block 3 are additionally regulated, first determining the resistance and then determining the reactance. The process is carried out to obtain a voltage extremum at the output of the low-pass filter 15, corresponding to the maximum power in the antenna 17.

One of the possible circuits of the control signal generator 11 is shown in FIG. 2 and has an input 18, the output 19 includes a time interval generator 20, a comparison unit 21, a block, 22 memory, first, second, third, fourth and fifth registers 23-27, the first and second drivers 28 and 29 controlling the coda and the detector of the extremum.

The shaper of 20 time intervals sets the time intervals during which the shaper 11 operates in the tuned resistance mode, in the active resistance tuning mode or in the maximum power tuning mode in the antenna 17. The first register 23 generates control signals for the discrete control phase switch 5 and the electronic switch 9, the second register 24 is designed to receive input data input to the shaper 11 from the output of the analog-to-digital converter 10. The third and The Fourth registers 25 and 26 control the block parameters 3, wherein the third register 25 controls the parameters defining the reactance, and the fourth register 26 controls the parameters defining the resistance.

Fifth register 27 provides control of the transmission ratio of the controlled voltage divider 12. The first and second drivers 28 and 29 produce control codes for the third and fourth registers 25 and 26, as well as for the fifth register 27 ..,

First, the driver 20 sets the mode of resistance. For this purpose, signals to the electronic switch 9 are output to the first register 23 for connecting the output of the phase detector 8 to the input of the analog-digital converter 10 and the controlled discrete phase shifter 5 to set the phase shift to 90 °. In block 22, a tolerance code reading signal is supplied corresponding to the reactive impedance setting. The variance of the reactive impedance is entered into the second register 24 and compared in block 21 comparison with tolerance codes. Depending on the magnitude and mismatch sign, unit 3 changes the parameters to compensate for the change in load reactance with an accuracy determined by the tolerances. When the mismatch voltage falls within the specified limits, block 21 issues a signal to the first driver 28 to stop the state change.

the third register 25. In addition, in the shaper 20, the block 21 generates a signal to form the next time interval, i.e. to change the mode of operation of the imaging unit 11. The latter begins to operate in the resistive tuning mode, during which signals are generated, at which the discrete phase shifter 5 has a phase shift of 0 °, and the control codes from the first imaging unit 28 enter the fourth register 26.

At the end of the process of tuning for active resistance, the driver 20 sets the tuning mode to the maximum power in the antenna. For this, the first register 23 outputs a control signal to the electronic switch 9, whereupon the output of the low-pass filter 15 is connected to the input of the analog-digital converter 10, and the output of the phase detector 8 is disconnected from this input. The imaging unit 20 also signals the memory unit 22 to read out other tolerances corresponding to the upper and lower threshold limits of the dc amplifier 14. Readable codes are fed to comparison unit 21. When the output code of the second register 24 falls within the permissible limits, the comparison unit 21, through the imaging unit 20, activates an extremum detector 30. which controls the regulated voltage divider 12, returning the FBD 14 to the linear mode of operation, and the voltage at the output of the electronic switch 9 and the corresponding code at the output of the second register 24 are within tolerances. The extremum detector 30 issues a prohibition to change the state of the p of the register 27, and to the first driver 28 a signal to successively alternate the state of the third and fourth registers 25 and 26, first in one direction and then in the other. This change stops when the voltage reaches the output of the low-pass filter 15 and the corresponding code at the output of the second register 24. This value corresponds to the maximum power at the antenna, so the tuning cycle ends.

Thus, the use of alternately switched active and reactive resistance control loops, a circuit to maintain maximum power in the antenna 17, and a circuit that maintains the linear mode

the operation of the FBT 14 allows to increase the accuracy of matching the transmitter with the antenna, and using the first and second amplifiers 6 and 7 when introducing phase detection instead of amplitude increases the noise immunity of the automatic matching of the transmitter with the antenna.

Claims (1)

Claims of the Invention A device for automatic matching of a transmitter with an antenna, comprising a series-connected transmitter, a directional incident wave coupler, a directional reflector coupler, and a block of matching elements with control parameters, an antenna, a series-connected phase detector, an electronic switch, an analog-to-digital converter , a driver of control signals and a controlled voltage divider, with the second output of the driver of control signals being connected to the third input of the control signal generator of the sub-keys to the control input of the block of matching elements with control parameters, and the input of the directional responder of the incident wave is connected to the output of the transmitter, - vanes, introduced in series connected discrete controlled phase shifter, the input of which is connected to the second output of the directional response of the incident wave, and the first amplifier-limiter, the output of which connected to the first input of the phase detector, the second amplifier-limiter, the input of which is connected to the second output of the directional tap of the reflected wave, and the output connected to the second input of the phase detector, current transformer, the primary winding of which is connected between the antenna and the output of the matching element with controlled parameters, serially connected multiplier, direct current amplifier, the second input of which is connected to the output of the controlled voltage divider, and low pass filter, the output of which connected to the second input of the electronic switch; the fourth output of the control signal generator is connected to the control input of the discrete controlled phase shifter; the first output of the secondary current transformer is connected to the common bus; the second output of the secondary winding of the current transformer is connected to the inputs of the multiplier, and the second control input The voltage divider is the input of the reference voltage of the automatic matching device of the transmitter with the antenna. ™ H g 23 20 Ј.Ь / р ishash Ј.W 1IIII. III $ 19 FIG. 2 Cosq fp f00 .. 3,  - - .... - I - I, - V L