SU1392515A1 - Carrier frequency analyzer of a single microwave radio pulse - Google Patents

Abstract

The invention relates to a radio measuring technique. The purpose of the invention is to improve the measurement accuracy and expand the range of measured frequencies. The device contains sensors made in the form of cylindrical resonators (CR) 1 with a central rod 2 loaded on a capacitive load 3. The capacitance loading CR 1 is formed by a gap between the end of the central rod 2 and the upper end cover 4 of CR 1, A flexible membrane 5 can be mechanically reversed. Screw 6 can mechanically change the bend of membrane 5. Linking CRS 1 to a length of waveguide 7 is done through communication slots cut perpendicular to the axis in the wide wall of waveguide 7. Linking CRG1 to a detector head 9 os It is realized by loop 10. In order to avoid passing a signal with a frequency lying between any adjacent resonant frequencies, the bandwidths of CRR 1 must overlap so that at a frequency, respectively. in the middle of the interval, the levels of the output signals would be the same and slightly exceeded the level of operation of the registering devices (Us). Then, at the middle frequency of the interval, two recording devices will be triggered simultaneously, corresponding to CR 1 with neighboring resonant frequencies. 3 il. 5 / § (J C CA: x to eat

Description

Fiá.1

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And the invention will apply to a radiation-measuring technique and can be used to measure the frequency of a mating microwave RF pulse.

The purpose of the invention is to improve the measurement accuracy and expand the range of measured frequencies.

Fig. 1 shows the construction of a single-frequency radio frequency meter meter; in fig. 2 is a view A of FIG. 1i in FIG. 3 shows the resonance curves of two adjacent resonators 1.

The carrier frequency meter of a single microwave radio pulse contains sensors made in the form of cylindrical resonators 1 with a central rod 2 loaded on a capacitive load 3. The loading capacitor 1 is formed by a gap between the end of the central rod 2 and the upper end cover 4 of the cylindrical resonator 1, A flexible membrane 5 mounted on the periphery with the cylindrical part of the resonator 1. By means of screw 6, screwing into cavity 4 of the resonator 1, it is possible to mechanically change the bend of the membrane 5; Thus, changing the size of the gap between the end of the central rod and the membrane, which allows to change the resonant frequency of the resonator by 50-60 MHz. The variation of the resonant frequency within large limits is achieved by varying the length of the central rod 2. The connection of the cylindrical resonator 1 with the waveguide length 7 is carried out by means of connection slits 8, cut perpendicular to the axis in the wide wall of the waveguide length 7. The width of the communication slits 8 is selected coefficient of communication 3 within

lah

O 1 0.04, j,

where Q is the quality factor of cylindrical

rezonators; A - required measurement accuracy

frequencies.

The cylindrical resonator 1 is connected with the detector head 9 by means of loop 10. From the output of the detector head 9, the signal

enters the recording device. Cylindrical resonators 1 are installed together in the axis of the waveguide segment 7.

-

925

Q 15 20 25 Q 35

45

55

15

To determine the frequency of a single microwave pulse in the working frequency band, cylindrical resonators 1 were tuned to resonant frequencies after 20 MHz. To avoid a signal passing at a frequency between any adjacent resonant frequencies, the passbands of cylindrical resonators should overlap so that at a frequency corresponding to the middle of the interval, the levels of input signals would be the same and slightly higher than the response level of the recording devices (Vj.p) . Then, at the middle frequency of the interval, two recording devices operate simultaneously, corresponding to cylindrical resonators 1 with adjacent resonant frequencies.

The device works as follows.

The signal under study (a single radio pulse) enters the waveguide section 7. If its carrier frequency falls into the passband of a resonator 1, in the latter, electromagnetic oscillations are excited through the communication slots 8. The resonator 1 is connected through loops 10 to the detector head 9, whereby part of the power of the signal under study is detected and the video signal thus obtained is fed to the indicator device.

Claims (1)

Invention Formula A carrier frequency meter for a single microwave radio pulse containing a waveguide section, sensors installed along a straight line parallel to the axis of the waveguide segment, and associated with it, which is different from the fact that, in order to improve the measurement accuracy, the sensors are made in the form of cylindrical resonators, connected to the waveguide section by means of communication slots, cut perpendicular to the narrow walls of the segment, a waveguide in the wide wall, the dimensions of the communication slots are selected from the condition of providing the coupling coefficient 0- / 3 and 0, OA QA - 1, where Q is the quality factor of cylindrical resonators; A is the required frequency measurement accuracy. Bid Phie 2 puzh wed Jpg