SU1437940A1 - Switch - Google Patents

Abstract

The invention relates to radio and m. used to switch channels of the feeder path. The purpose of the invention is to expand the operating frequency band of the switch. The switch contains a T-shaped branching of 1 transmission lines (LP), diodes 2 and 5, cond-p 3, segment 4 LP. In the switch entered the second segment of 6 LP. One end of the 6 LP segment is short-circuited, and the other is connected to the lining of the cond. 3. The lengths 1 of the 4th and 6th LP segments are equal and satisfy the ratio of 1 Lz (0.045 K - 0.195 stu 0.289) Oka /, lower operating frequency, Kj, - max. coefficients a voltage wave at the input of a switch in the operating frequency band. Segments 4 and 6, as well as cond-p 3, form a U-shaped high-pass filter, the parameters of which determine the operating frequency band of the switch. 1 il. cl

Description

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The invention relates to radio engineering and can be used to switch channels of the feeder path.

The aim of the invention is to expand the operating frequency band of the switch.

The drawing shows a circuit diagram of a switch.

The switch contains a T-junction 1 of the transmission lines, the first arm of which is the input of the switch. The second side of the T-junction 1 is connected by one pin of the first diode 2, the other pin of which is connected to the first plate of the capacitor 3, the second plate of which is the first switch output. To the third shoulder of the T-junction 1 is connected at one end the first section 4 of the transmission line, to the other end of which the second diode 5 is connected in parallel, their connection point is the second output of the switch. One end of the second segment 6 of the pseud line is short-circuited, and the other is connected to the second plate of the capacitor 3. The lengths 1 of the first and second segments 4 and 6 are equal and satisfy the relation

1 g (0.045 - 0.195 K „+ + 0.289) L8 / 4,

where is the wavelength in the transmission line at the lower operating frequency,

K is the maximum ratio of the standing voltage wave at the input of the switch in the operating frequency band.

The switch works as follows.

When the first and second diodes 2 and 5 are closed, the insertion loss between the input and the first output of the switch is large, and between the input and the second

the output is small, the signal from the input goes to the second output of the switch. When the first and second diodes 2 and 5 are open, the input attenuation from the input and the first output of the switch decreases, and between the input and the second output increases, the signal from the input goes to the first output of the switch. The first and second segments 4 and 6, as well as the capacitor 3, form a U-shaped high-pass filter, the parameters of which determine the operating frequency band of the switch.

Claims (1)

Invention Formula Switch, contain (i-T T-shaped branching of transmission lines, the first of which is the input of the switch, is connected to the second arm with one pin the first diode, the other of which is connected to the first capacitor plate, the second the lining of which is the first output of the switch, and to the third arm is connected at one end the first segment of the transmission line, to the other end of which is parapleno connected the second diode, and their connection point is the second output of the switch, is also distinguished by the fact that, in order to expand the operating frequency band, a second segment has been introduced transmission line, one end of which short-circuited and the other connected to the second capacitor plate, while the lengths 1 of the first and second segments of the transmission line are equal and satisfy the relation 1 (0.045 K ,,, - 0.195 K, + + 0.289) g / 4, where X g is length; 1 and waves in the transmission line at the lower operating frequency; K is the maximum value of the voltage standing wave at the input of the switch in the operating frequency band.