SU1561130A1 - Switch - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to increase the separation. The switch contains segments 1 and 2 of the transmission line, PIN diodes 3 and 4, a resistor 5, a directional coupler (HO) 6 and a bias circuit 7. When the polarity of the control voltage is changed, PIN diodes 3 and 4 are unlocked. Resistor 5 shunts cut 1, PIN diode 3 connects to the output of the device in series the connected cut 2 and the auxiliary path HO 6. This results in a device close to short circuit at the output of the device. The main part of the input signal is then dissipated in the resistor 5 and the device remains matched. The residual signal that leaks to the output of the device is compensated for by means of a small part of the input signal, which is branched into the auxiliary path 6, of the input signal coming to the output of the device through segment 2. The goal is achieved by introducing segment 2 with a length of four waves and as associated quarter-wave transmission line segments. In this case, the choice is made of the coefficient of communication between the main and auxiliary paths of the НО 6. 1 Il.

Description

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The invention relates to radio engineering and can be used in radio receiving and radio transmitting devices.

The purpose of the invention is to increase the separation.

The drawing shows a circuit diagram of a switch.

The device contains the first 1 and second 2 segments of the transmission line, the first 3 and second 4 p-i-p-diodes 3 and 4, the resistor 5 with a resistance equal to the characteristic impedance of the first segment 1, the directional tap 6, which is made in the form quarter wavelength transmission line segments; and an offset circuit 7. The first 3 and second 4 p-i-p-diodes 3 and 4 are connected by their own electrodes to the first and second ends of section 1, respectively. Resistor 5 is connected by alternating voltage between the common bus and the other electrode of the second p-i-p-diode 4, the output arm of the main path of the directional branch 6 is connected to the second end of the first segment 1, the output arm of the auxiliary path is connected to the common bus, and the diverted shoulder through the second segment 2 is connected to the second electrode of the first p-i-p diode 3.

The coupling coefficient K of the main and auxiliary paths of the directional response 6 is selected from

K,

KG

where v + is the resistance of the open first p-j-p-diode 3;

p is the characteristic impedance of the first segment 1

The device works as follows

With the polarity of the control voltage, when the first and second p-i-p-diodes 3 and 4 are locked, the input signal passes through the main path of the directional response 6 and the first segment 1 to the switch output with almost no loss. and the auxiliary paths of the directional coupler b are much less than 1, and the output and expanded shoulders of the auxiliary path are connected to the common bus, the output arm is directly, and the expanded arm is connected with the open 2 segment, so the connection of the main and auxiliary links is nogo paths does not increase the losses

By changing the polarity of the control voltage, the first and second p-i-p-diodes 3 and 4 are unlocked. Resistor 5 shunts cut 1, the first p-i-p-diode 3 connects to the switch output in series the second cut 2 and the auxiliary path of the directional coupler 6, which

leads to the establishment of a switch close to the short-circuit mode at the output of the switch. The main part of the input signal is then dissipated in resistor 5, with the result that the switch remains matched. The residual signal that seeps into the switch output is compensated for by using a small part of the input signal that arrives at the switch output through the branch path to the auxiliary path of the directional coupler 6.

5 second segment 2.

Claims (1)

Invention Formula A switch containing the first section of the transmission line, a quarter-wavelength, the first end of which is the output of the switch, the first and second p-i-p-diodes, which are connected by their electrodes to the first and second ends of the first segment of the transmission line so5 , a control voltage supply circuit and a resistor with a resistance equal to the characteristic impedance of the first segment of the transmission line, which is connected by alternating voltage between the other electrode of the second p-i-p-diode and the common bus, characterized in that To increase isolation, a second segment of the transmission line, a quarter-wavelength in length, and a directional coupler, which is made in the form of connected quarter-wave transmission line segments, are introduced, with the input arm of the main path of the directional coupler being the switch side, and the output one the end of the first segment of the transmission line, the output arm of the auxiliary path is connected to 0 by a common bus, and the expanded arm of the auxiliary path through the second segment of the transmission line is connected to another electrode of the first p-i-p diode, and the coupling coefficient K of the main and auxiliary paths of the directional coupler 5 is selected from the condition K-f where v is the resistance of an open 0p-i-p-diode; p is the characteristic impedance of the first segment of the transmission line. 0 five