SU1578777A1 - Attenuator for wave ho1 of round waveguide - Google Patents

Abstract

This invention relates to a microwave technique and can be used as a mode-selective attenuator in measuring multimode paths. The goal is to improve the matching and increase the attenuation of non-working wave types. The attenuator contains two extreme sections 1 and 2 of a circular waveguide and a central section 3 made of absorbing material. The walls of sections 1, 2 and 3 in the place of their connection are made in the form of teeth 4 and nested into each other. The inner diameters of sections 1.2 and 3 are equal, the width of the teeth 4 at the base does not exceed the working wavelength, their height is much greater than the wavelength, and the number of teeth 4 is greater than the number of wavelengths laid on the circumference of sections 1 and 2. Teeth 4 are matching elements between sections 1, 2, and 3 at the point of their connection, and they smoothly transform the H 01 wave into sections 1 and 2 into the H 01 wave of section 3. Section 3 provides for the effective attenuation of the higher H 0N types and E 0N waves. To regulate the attenuation of the H 01 wave and parasitic wave types, section 3 can be made of a number of identical sections. 1 il.

Description

This invention relates to a microwave technique and can be used as a mode-selective attenuator in measuring multimode paths.

The purpose of the invention is to improve the matching and increase the attenuation of non-working wave types.

The drawing shows an attenuator for the wave H01 of a circular waveguide.

The attenuator for the H01 wave of a circular waveguide contains two extreme sections 1 and 2 of the circular waveguide and a central section 3 made of absorbing material. Round waveguide steaks of two extreme sections

1 and 2 and the central section 3 in the place of their connection are made in the form of teeth 4 and nested into each other. At the same time, the inner diameter of the outer sections 1. 2 is equal to the inner diameter of the central section 3. The width of the tooth 4 at its base does not exceed the working wavelength and gradually decreases to zero towards the top of the tooth. The height of the tooth 4 is much longer than the wavelength, and the number of teeth 4 is greater than the number of wavelengths placed on the circumference of the outer sections 1 and 2 of the circular waveguide.

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Attenuator for wave HB1 round waveguide works as follows.

A group of waves propagating in an oversize path is fed to one of the extreme sections I or 2 of the circular waveguide. The teeth 4 are the matching elements between the extreme sections I and 2 and the central section 3 at the point of their connection. They carry out a smooth transformation of the H01 wave in the extreme sections I and 2 of the circular waveguide into the H wave of the central section, providing a high degree of matching as a working H01 waves, and non-working related waves. For this, the width of the wave 4 at the base is chosen to be less than the working wavelength and decreases to the top of the wave 4 to zero. The height of the tooth 4 is much longer than the working wavelength, and the number of teeth 4 is greater than the number of wavelengths placed on the circumference of the outermost sections 1.2.

The central section 3, which is made of absorbing material, provides for an effective biased attenuation of waves of higher types H0n and waves EOG |. For example, the attenuation of the H wave exceeds the attenuation of the H 0 wave at least four times. For other types of waves with zero radial index, this attenuation is even greater. In waves N tn and E (t 0) with an increase in the index m, increase (TIR

there is an energy density near the walls of the central section 3, made of absorbing material,

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Therefore, these waves have attenuation no less than the H0 wave.

In order to control the attenuation of the H0 wave, and parasitic type waves, the central section 3 can be made up of a series of identical sections.

Claims (1)

The use of an attenuator for the H01 wave of a circular waveguide allows for an increase in the attenuation of parasitic waves due to the use of a direct connection of their fields with an absorber, to improve the matching of the device by eliminating the effect of a strong conversion of non-working waves into secondary waves, Attenuator for the H0 wave, a circular waveguide, containing two extreme sections of a circular waveguide and a central section made of absorbing material, so as to improve the matching and increase the attenuation of non-working wave types, the circular waveguide wall of the two extreme and central sections in place their joints are made in the form of teeth and embedded one into the other; the width of each tooth at the base does not exceed the working wavelength and decreases smoothly to zero to the top of the tooth, the height of the tooth is much larger than the working length. The waves and the number of teeth are greater than the number of wavelengths that lie on the circumference of the outermost sections of the circular waveguide.