SU1425564A1 - Device for measuring electromagnetic field in waveguide - Google Patents

Abstract

The invention relates to a microwave measuring technique and can be used in the study of the parameters of waveguide elements and systems, in the development and testing of waveguide communication devices operating on higher types of waves. The purpose of the invention is higher measurement accuracy. The device contains a multi-mode waveguide (MMW) 1, the co-located load (CH) 2 is placed, the outer surface of which is adjacent to the walls of the MMB 1, and the inner surface repeats the shape of a smooth transition from the MMB 1 to the single-mode waveguide (ICB) 3 , the probe 4 in the form of a small conducting sphere fixed on a lavsan thread 5 with the possibility of movement in the cross section ıSh 1. The use of the introduced polarization separator 6 at the input of the introduced microwave receiver 7 allows measurements in two orthogonal polarities aci x, CH 2 provides absorption of waves propagating from the interface IIM 1 and 3 to OMV microwave generator 8, which avoids unwanted reflections. 1 il. f (L

Description

4 S

sd ate

Oi

The invention relates to an ultra-high frequency (UHF) measuring technique and can be used to study the parameters of high-water elements and systems in the development and testing of waveguide communication devices operating on high types of waves,

 11el of the invention is accurate measurement accuracy,

; The drawing shows the break: lagaemo

:device,

: A device for measuring the electro1 magnetic field in a waveguide contains

Multimode waveguide 1, in which

 - dielectric constant of the substance of the ball;

 - probe radius 4. The electromagnetic field incident on probe 4 excites a transmitted (reflected) wave, the X component of which, for example, for a rectangular waveguide section (a-b) has the form

five

CF. , „.,)

POLC t

    J

xsin - Y - e- b

 .kip

„2

Cos

- XX a

(3)

I placed a matched load 2,; the outer surface of which is adjacent - IGT to the walls of the multimode waveguide i. 1, and the inner surface repeats the 20 I form of a smooth transition from a multimode I first waveguide 1 to a single mode waveguide 3, a probe 4 in the form of a small conducting sphere fixed on a polyester filament 5 with the ability to move in 25 cross section of multimode waveguide 1. The output flange of the single-mode waveguide 3 is connected to the polarization separator 6 and the microwave receiver7 “The free end of the multimode waveguide 1 is connected to the output of the microwave generator 8.

 When spreading mode mix. in a regular multimode waveguide: 1 transverse components of the electrical component I can be represented; in the form of a decomposition into series by mode and type.

; (X, Y, Z) S: JA, i: jX, Y) e - -

(CD) e

l -;, -, 2

where ,, - complex and mplit

mod and types; eU (X, Y),

 S.

in

- vector structure functions and constant propagation of mods of TH, TE types.

With a small radius of probe 4 and electrical excitation, we can assume that the dipole. probe time 4

- .. (X ,,

Y)

(2

B +.

where E) is the component of the electric field in which the probe is located

Where

. Cos

/ in ,,

, sin - YC

m

, (K ,, .. -1 dySin- X „

Cop os

n „. II t, -irYo + J-r-A d, sin

(four)

(dielectric and magnetic permeability of the medium filling the waveguide; d, dy, dg are the components of the dipole moment of the probe 4.

You can get a similar expression for the yth component

fi o

W.shp

inl XcosJUll-Yx a b

ve

where is e

 i

(five)

8 | G i TJ f ™ r l V

 , - d, .sin -Xocos --YO

PTL L B

y wn abji ,,,

h x№, gs - r -) ---, - d

.

0

five

xsin t-yt b

j m, 1

. l m „. and n ,, sin - Xo sin T-YO. a b J

(6)

On the basis of simulations (4) (6), it can be shown that only the amplitudes of the main modes H ((,), H, (, (,)) of the electromagnetic field scattered by the probe 4 are linearly related to the corresponding E transverse components (XO , Y), E (XO, YO) research3U2556A

of the electromagnetic field, in which, with the zone removed, the probe A is located;

the adjustment elements of the compensation channel ErasH, (Xp, Y) sin - YO sin-g YX tions (not shown) of the crawl signal

. and then measure the level of the lower mode

  g, -14 (-1 electromagnetic field in single mode

heh y p- 1} j f) rf

waveguide 3 for each position

xp, z f, V; „v probe D. Use of the separator 6

  Exj (- / -. Ftf n / - О S 1-П L. К «

f you g g polarization at the input of the receiver 7 allows measurements on two g V 1C, () (g-orthogonal polarizations.

Claims (1)

where the weight spatial dependencies determine the excitation conditions — the claims of the invention are a floating probe 4 lower HCH and  mod in a rectangular waveguide. Sog- A device for measuring electrolysed load 2, as well as a single-magnetic field in a waveguide, a pre-modem waveguide 3 allows for the sequentially connected filter lower types, air-20HF-oscillator, multimode waveguide, as a result of the transformation, a consistent load and probe, on the probe 4 and at the junction between the many-plus-one that, with tsedov 1 and single-mode 3 waveguides. At the same time, the amplitudes of the lower types in the one-probe are installed with the possibility of a multimode waveguide 3 linearly coupling within the multimode waveguide with the components of the investigated electrically-water, the external surface of the co-magnetic field. The matched load is adjacent to the walls of the multi-load 2 provides absorption of the mode waveguide, and its internal waves propagating from the junction the surface repeats the shape of a smooth multimode 1 and single mode 3 wave-, Q-transition from multimode waveguide to the microwave oscillator 8, that the device is connected to the introduced one and it terminates the unwanted modulated waveguide, which through The measurement is carried out as follows: the polarization separator in accordance with the measurement is combined with an input receiver.