SU617805A1 - Shf signal delay system - Google Patents

Description

one

The invention relates to radio engineering and can be used in the development of microwave delay devices of various types of modulations.

A device for delaying microwave signals comprising an amplifier, a first power divider, a serially connected delay line, a second power divider, a first band-pass filter, a first modulator and an output filter are known, the low-frequency input of the first modulator connected to the output of the modulating frequency generator, and the delay line, the first and second power dividers are included in the feedback circuit of amplifier 1.

However, in the known device there is a large signal loss with various types of modulation.

The purpose of the invention is to reduce signal loss in various types of modulation.

To do this, in a microwave delay device containing an amplifier, a first power splitter, a serially connected delay line, a second power splitter, a first band-pass filter, a first modulator and an output filter, the low-frequency input of the first modulator connected to the output of the modulating frequency generator, and

the delay line, the first and second power dividers are included in the feedback circuit of the amplifier, the amplifier is connected between the first power divider and the delay line, and the feedback circuit between one of the outputs of the second and one of the inputs of the first power dividers is additionally connected in series to the second bandpass filter, second modulator

and a third band-pass filter, with the low-frequency input of the second modulator connected to the output of the modulating frequency generator. The drawing is structural

electrical circuit of the microwave signal delay device.

The proposed device comprises an amplifier 1, a first power divider 2, serially connected delay line 3, a second power divider 4, a first band-pass filter 5, a first modulator 6 and an output filter 7, the low-frequency input of the first modulator 6 connected to the output of the modulating frequency generator 8 and the delay line 3, the first 2 and the second 4 power dividers are included in the feedback circuit of amplifier 1, the amplifier 1 is connected between the first power divider 2 and the delay line 3, and in the feedback circuit between one of the outputs of the second 4 and one of the inputs of the first 2 power dividers additionally connected in series are the second bandpass filter 9, the second modulator 10 and the third bandpass filter 11, with the low-frequency input of the second modulator 10 connected to the output of the modulating frequency generator 8.

The proposed device operates as follows.

The microwave input signal (of almost any kind of modulation) with carrier frequency / o passes through serially connected input filter 12, first power divider 2, amplifier 1, delay line 3, where the signal is delayed by Time, second power divider 4, second band-pass filter 9 and is fed to the input of the second modulator 10. The input signal with the frequency fo cannot pass through the third band-pass filter 11 and the first band-pass filter 5, which are blocking for this signal (with frequency / o). The low-frequency input of the second modulator 10 receives a signal from a modulating frequency generator 8 with an FM frequency, which is selected from the condition of the necessary suppression of spurious microwave signals and ensuring the required bandwidth of the bandpass filters (operation in a given operating frequency range and transmission of the signal spectrum without distortion), t . e. as a rule, rather large. The spectrum of signals with carriers of the form Io ± n-Fj formed by the output of the second modulator 10 is fed to the input of the third bandpass filter AND, which can be tuned, for example, to the frequency. The frequency band of the specified filter must be such as to ensure effective suppression of unwanted harmonics second modulator 10, and especially with the frequency fo. Next, the signal with the frequency fo + F through the first power divider 2 is fed to the input of amplifier 1, where it is amplified, then delayed by TO in delay line 3 and through the second power divider 4 and the first band-pass filter 5 is fed to the input of the first modulator 6, to the low-frequency the input of which also receives a signal from the generator 8 of modulating frequency with frequency

as a result, the frequency spectrum with carriers () at the output of the first modulator 6 appears at the output of the first modulator 6; the output filter 7 is tuned to frequency / o; as a result, the input signal in this device is twice amplified, twice shifted by TO and enters the output device. The frequency instability of the oscillator 8 of the modulating frequency can be quite large, since it almost simultaneously affects different modulators with different signs, as a result of which the carrier frequency of the input signal remains unchanged.

Thus, the proposed device, in comparison with the prototype, allows to obtain large delays with less attenuation of microwave signals with any type of modulation and provides a large suppression of spurious signals.

Claims (1)

Invention Formula A microwave device delay device containing an amplifier, a first power splitter, a delay line connected in series, a second power splitter, a first band-pass filter, a first modulator and an output filter, the low-frequency input of the first modulator connected to the output of the modulating frequency generator, and the delay line first and the second power dividers are included in the feedback circuit of the amplifier, which is different from the fact that, in order to reduce signal losses during various types of modulation, the amplifier is connected between The first power divider and the delay line, and in the feedback circuit between one of the outputs of the second and one of the inputs of the first power dividers are connected in series the second bandpass filter, the second modulator and the third bandpass filter, and the low-frequency input of the second modulator is connected to the output modulating frequency generator. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 310356, cl. N OZN 7/30, 1968.