SU1646012A1 - Matching unit - Google Patents

Description

one

(21) 4680985/09

(22) 04.20.89

(46) 04.30.91. Bil R 16 (72) L.S. Kazansky

(53) 621.396.67 (080.8)

(56) US Patent No. 3443231, cl. 324-174, 1968.

(54) AGREED DEVICE

(57) The invention relates to radio engineering. The purpose of the invention is to expand the range of operating frequencies while increasing the reliability of the device. The matching device contains a tunable link of three reactive elements: two variable parallel capacitors 1 and 2 and a serial variable coil 3 inductance, as well as an antenna feeder 4, a transmitter feeder 5 and segments 6 and 7 of the transmission lines. The expansion of the working range towards high frequencies is achieved due to the fact that the segments 6 and 7 introduce successively from the point where the capacitors 1 and 2 are turned on, negative reactive conductivity, which is equivalent to reducing their minimum capacitance. By reducing the requirements for the minimum size of the coil 3, it is possible to perform it as a contactless riometer, which increases the reliability of the matching device. Device on PP. The 2 and 3 formulas are distinguished by the implementation of a tunable link as a P-link and a T-link. 2 hp ff, 3 ill.

(I

WITH

The invention relates to the field of radio engineering and is intended to match (tuning for a traveling wave) the feeder of the high-power range of a decameter wave transmitter. The device may be part of the transmitter or may be made as a separate product and form part of the feeder path.

The purpose of the invention is to expand the range of operating frequencies while increasing the reliability of the device.

FIG. Figure 1 shows the schematic circuit diagram of a matching device for the case when the antenna feeder and transmitter feeder are asymmetrical; in fig. 2 is a schematic electrical diagram of a matching device with a symmetrical antenna feeder and a transmitter feeder; in fig. 3 is an embodiment of a matching device.

The matching device (Fig. 1) contains a tunable link of three reactive elements: two variable parallel capacitors 1 and 2 and a serial variable. The inductance coil 3, antenna feeder 4 and transmitter feeder 5, additional segments of transmission lines 6 and 7. Lengths of additional line segments gears 6 and 7 are selected according to the inequality. according to inequality 1 -, where

ft is the minimum wavelength;

V v- “where V is the speed of propagation MQKC

but

four

about:

m

However, they are full in the additional segment of the transmission line 6 or 7, fWQnj is the maximum frequency of the operating range, Wave impedances W are additional segments of the transmission line 6

sixteen

where 1 - the length of the additional cut-1 ka transmission line 6 or 7, respectively

Matching device operates as follows. After connecting the antenna feeder 4 to the antenna, the variable parallel capacitors 1, 2 (Fig. 1) and the serial variable of the inductor 3 are adjusted to the minimum SWR and feeder 5 of the transmitter at the given operating frequency. As a result, the complex input impedance of the antenna will be matched to the feeder 5 of the transmitter. The expansion of the working range towards high frequencies is achieved because the additional segments of transmission lines 6 and 7 with the parameters mentioned above introduce negative reactive conductivity into the switching points of the variable parallel capacitors 1, 2, which is equivalent to reducing their minimum capacitance. By reducing the requirements for the minimum value of the sequential variable of coil 3, it is possible to perform it as a contactless variometer, which increases the reliability of the matching device.

Similarly, the matching device shown in FIG. 2 works. We note only that in practice, the symmetric transmitter feeder 5 and the antenna feeder 4 are used in cases where a symmetrical antenna is used, as well as at high transmitter power levels, to which no standard coaxial cables.

The matching device in accordance with the fig. 3 works as follows. After connecting the antenna feeder 4

+ ctR

, one

 t- b

and 7 are equal to W Wq, A, where W is the characteristic impedance, respectively, of the antenna feeder 4 or transmitter feeder 5, and the value of A is determined from the relation:

five

0

five

0

five

0

five

0

The antenna is used to adjust the variable capacitor 3 and the successive variable coils 1, 2 of the inductor to obtain the minimum CWS value in the transmitter feeder 5 at a given operating frequency. As a result, the antenna's complex input impedance will be matched with the transmitter feeder 5.

The expansion of the working range towards high frequencies is achieved because the additional segments of transmission lines 6 and 7 with the above parameters are introduced successively with variable inductance coils 2 and 1 and negative reactance, which is equivalent to reducing the minimum values of variable inductance coils 1 and 2. Therefore, in practice, compact contactless variometers are used as variable inductance coils 2, 1, which significantly increases the reliability of the matching device.

Claims (3)

1. Matching device containing a tunable element of reactive elements, antenna feeder and transmitter feeder, characterized in that, in order to expand the range of operating frequencies while improving reliability, two identical additional transmission line sections are inserted, one of which is connected between the output transmitter feeder and tunable Even input, and the other between the tunable link output and antenna feeder input, while the impedances of the additional segments of the transmission line are not equal to the wave impedances of the antenna feeder and transmitter feeder and differ by A, where -i- ctg2 2fa fl + ctg2 2ft 1 fl where 1 is the length of the additional segment of the transmission line; I - the minimum wavelength. 2 "The device according to claim 1, which is based on the fact that the tunable link is made in the form of a P-link with a tunable inductance coil in a serial branch and tunable capacitors in parallel branches x, while the wave impedances of additional segments of the transmission line A times more transmitter wavelength J7 1646012 output impedance of antenna fndpra and feeder transmitter 3. The device according to claim. Characterized in that the tunable link is issued to the form of a T-link with variable inductors in successive branches x and a variable capacitor in a parallel branch, while the wave resistance of the additional segments of the transmission line is A times smaller than the wave resistance of the antenna Feeder and Transmitter Leader. v / (antenna / (antenna MЈ