SU769708A2 - Device for matching radio transmitter to antenna - Google Patents

Description

one

The invention relates to radio engineering and can be used in the development of radio stations of a wide range of different power.

According to the main author. St. No. 542334, there is a known device for matching a radio transmitter with an antenna, which contains a tunable matching circuit, an active conductivity component sensor, made for example in the form of a resistive bridge, a control unit whose outputs are connected to a tunable matching circuit, amplitude and phase discriminators, whose inputs are connected to diagonal of the resistive bridge, while the output of the phase discriminator and connected to the input of the control unit, between one of the arms of the resistive bridge and the input of the control unit the comparison unit is turned on, the second input of which is connected to the output of amplitude discriminator 1.

However, the known device for matching a radio transmitter with an antenna has the following disadvantage. The resolution of the sensor of the active conductivity component deteriorates with decreasing traveling wave coefficient (QIS) in the antenna-feeder path, resulting in a tuning accuracy of the matching circuit

drops sharply, leading to unacceptable modes of terminal cascades of the amplifier power of the radio transmitter and significantly reducing the power given to them. In practice, the matching area of this device in the Wolpert-Smith diagram is limited to a circle with, 2. The purpose of the invention is to improve the accuracy of coordination when expanding the range

10 matches.

For this, in the known device of matching the radio transmitter with the antenna between the outputs of the comparator unit and the phase discriminator and the additional

15, the input of the control unit includes an element of coincidence, wherein the control unit contains a series-connected clock generator, a first and a second bit distributor, and

The outputs of both bit distributors are connected to the windings of the high-frequency relays, and the control inputs to the outputs of the matching zone determination unit, one of the inputs of which is an additional input of the control unit.

On the fit. Figure 1 shows the structural electrical circuit of the proposed device for matching the radio transmitter 30 with the antenna; in fig. 2 - control unit diagram; in fig. 3 is a diagram explaining the operation of the device.

The device for matching the radio transmitter with the antenna contains a tunable matching circuit 1 with two discrete adjusting elements — a long line 2 and a variable condeptor 3, an active conductivity component sensor 4, a control unit 5, an amplitude discriminator 6, a phase discriminator 7, a comparison unit and a coincidence element 9 ; the control unit 5 contains the distributors of bits 10 and 11, the clock pulse generator 12, the block for determining the matching zone 13, high-frequency relays 14.

The device works as follows.

The sensor 4 of the active conductivity component, made in the form of a resistive bridge, is energized with the frequency to which the tuned matching circuit 1 needs to be tuned. Sigpals from the supporting arm of the sensor 4 bridge and from the input of the tunable matching circuit 1 are fed to amplitude 6 and phase 7 discriminators . The input from the comparator unit 8 is fed from the reference arm of the sensor bridge 4 and from the output of the amplitude discriminator 6. The sign of the output voltage of the phase discriminator 7 depends on the sign of the reactive component of the input conductivity of the tuned matching circuit 1, and the sign of the voltage at the output of the block of comparison 8 - from the sign of the deviation of the active component of the input conductance of the tunable matching circuit 1 from the specified value. By combining the signs of the output voltages of the comparison unit 8 and the phase discriminator 7, the entire matching area of the non-tunable matching circuit 1, which is limited in the relative conductivity diagram (see Fig. 3) to the minimum IPM / Str, is divided into four zones. The signs of the output voltages of the phase discriminator 7 and the comparison unit 8 in I, II, 111, IV zopah in the conduction diagram are shown in parentheses. As can be seen from the diagram, the circles of the constant active conductivity g const differ very little from each other at low CBF values in the region of large conductivities. This explains the deterioration in the resolving power of the sensor 4 of the active conductivity component in this area.

The length of line 2 has, and the interleap capacitor 3 - K discrete bits. Upon the command to start tuning, the distributor of bits 10 and the distributor of bits 11 are set to zero states. In this case, all the high-frequency relays 14 are de-energized, the discrete bits of the variable capacitor 3 and the long line 2 are turned off and closed normally

closed contacts of high-frequency relays 14, switching rounds of bits of a long line 2. The length of a long line 2 is set to the minimum. Thereafter

the control unit 5 sets up a tunable matching circuit 1 with a long line 2 according to the signals from the comparison unit 8 and the phase discriminator 7 according to the bit-wise balanced algorithm. This happens as follows. The block for determining the zone of matching 13 by a combination of characters of the output voltages from the comparison block 8 and the phase discriminator 7 fixes one of

four zones, in which there is a point depicting the input complex conductivity of the tunable matching circuit 1 (for example, t. A in Fig. 3).

The clock pulse generator 12 saves pulses to the bit distributor 10. When the first pulse arrives, the high bit of the long line 2 is turned on. The zone detection unit

matching 13 according to the indications of the comparison block 8 and phase discriminator 7 evaluates the zone in which the input conductance of the tunable matching circuit 1 turned out to be and issues the command

to leave or turn off this bit on the bit distributor 10. If, for example, the combination () (+) changes (-f) (-) or (-) (-), then the bit remains on, and if

The combination {-) (+) appears, then the bit is turned off (see Fig. 3). With the arrival of the second pulse, the second bit of the long line 2 is turned on. The block for determining the matching zone 13 again evaluates the zone in which the input conductivity of the tuned matching circuit 1 is located and issues a command to the bit distributor 10. When the length of the long line 2 changes, the input complex

the conductivity of the tunable matching circuit 1 varies along the circumference of a constant IPM on the Volpert – Smith diagram (curve AB of the pas of FIG. 3). As soon as the input conductance of circuit 1

combination (-) (-) J will appear in zone I, the coincidence element 9 will be triggered. By the match 9 signal, the matching zone definition block 13 issues a command to the bit distributor AND, the first bit of the bit distributor turns on, and therefore the high bit This frequency subband discrete discharge variable capacitor 3. QBV at the input of a tunable matching

circuit 1 will increase and, as a result, the resolution of sensor 4 of the active conductivity component will increase. The active component of the input conductivity of the tunable matching circuit 1 does not change, and the negative reactive component decreases (curve BC in Fig. 3).

After the coincidence element 9 works, the further adjustment of the long line 2 is dried, according to the indications of only the comparator unit 8 with an accuracy of the size of the lower bit of the long line 2. When the distributor of bits 10 is finished, the distributor of bits 11 starts working. The variable balancing algorithm establishes the required value of the variable capacitor 3, to the least significant bit, compensates, and the reactive component of the input conductivity of the tunable matching circuit 1, according to m Azan phase discriminator 7 (curve AE in FIG. 3).

An increase in the resolution of the sensor 4 of the active conductivity component and, as a consequence, an increase in the matching accuracy is ensured by switching on the high-order bit of the variable capacitor 3 in zone 1 in the process of tuning the tunable matching circuit 1 by a long line 2.

Simultaneously with an increase in the matching accuracy, the matching range of the proposed device is extended compared to the prototype, since an increase in the IPM at the input of the tunable matching circuit 1 due to the inclusion of the higher bit of the variable capacitor 3 in zone 1 provides the required resolution of the sensor 4 of the active conductivity component matching antennas with low QBI.

Instead of a tunable matching contour 1 with discrete adjustment elements, this device can also use a contour with smoothly changing organs.

In these cases, the change in the input complex conductivity of the tunable matching circuit 1 at the nerve adjustment stage (according to the combinations of indications of the comparison block 8 of the phase discriminator 7) of the sequential tuner connected to the antenna (/ -throttle or Sposl) will occur around the constant active circle component of the resistance in the conductivity diagram. The number of the zone in which the most significant bit of the parallel tuning element must be turned on by a command from the coincidence element 9 is determined by the type of the tunable matching contour 1 circuit.

Naturally, when using tunable matching circuits 1 with smoothly varying limit settings, the distributors of bits 10 and 11 must be replaced with other devices, for example, with DC amplifiers that control ferrovariometers or electromechanical drives.

The use of a new coincidence element favorably distinguishes the proposed device from the indicated prototype, since the matching accuracy is improved and the matching range is expanded at the same time. The use of this device allows with the required accuracy to coordinate the output of the radio transmitter with the antenna-feeder path having an IPM of 0.05.

Claims (2)

1. A device for matching a radio transmitter with an antenna according to aut. St. No. 542334, characterized in that, in order to improve the accuracy of matching when extending the range of matching, between the outputs of the comparison unit and the phase discriminator and the auxiliary input of the unit control included a matching item. 2. The device according to claim 1, characterized in that the control unit contains serially connected clock pulse generator, the first and second bit distributors, and the outputs of both bit distributors are connected to the windings of high-frequency relays, and the control inputs to the outputs of the determining unit zone matching, one of the inputs of which is an additional input of the control unit. Sources of information accepted by rso attention during examination 1. USSR Copyright Certificate No. 542334, cl. P 03 And 7/40, 1974 (prototype).