JPH03167901A - Waveguide corner - Google Patents

Abstract

PURPOSE:To convert propagation directions of two orthogonal polarized electromagnetic waves simultaneously by selecting the shape of the cross section of a waveguide so that a slope at an angle of nearly 45 deg. provided to a corner of the square waveguide provides an optimum propagation characteristic to both the two orthogonal polarized waves. CONSTITUTION:The square shape of cross section whose length of side is D is formed to a square waveguide 1 so that two orthogonal polarized waves, TE10, TE01 waves are simultaneously propagated. Then a slope 2 is provided, which has an angle of nearly 45 deg. with respect to the propagation direction of the electromagnetic waves to the corner. The cross sectional shape of the waveguide reaching the corner is formed to be tapered and the lengths of the sides at the entrance to the corner and the exit from the corner are selected to be A, B. The lengths A, B of the sides are selected so that the conversion is caused at a cross point shown in Figure (b). Thus, the optimum cut-rate x/y is obtained to both the TE10, TE01 waves.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a waveguide corner used in a rectangular waveguide that simultaneously propagates electromagnetic waves of two orthogonal polarizations.

[Prior Art j] Conventionally, in a waveguide circuit that transmits two orthogonal leakage electromagnetic waves, when changing the propagation direction, a vent with a radius R is used as shown in FIG. here,
In order to ensure good transmission characteristics, it is necessary to increase the radius R to some extent. Therefore, when using a vent as described above, a distance of at least radius R is required to change the direction, which has the disadvantage of requiring a large planar or spatial area6. For pipes, the E surface corner shown in Figure 6,
The H-plane corner shown in FIG. 7 may be used. In each of the above figures, (a) shows the cross-sectional shape of the corner portion of the waveguide, and (b) and (c) show the opening shape of the waveguide leading to the corner portion. By using such a waveguide corner, the propagation direction of one polarized wave can be converted to a right angle.

[Problem to be Solved by the Invention] However, at a waveguide corner, the cut rate (x.
/y), the propagation characteristics vary, and the optimum cut rate (x/y) differs between the E-plane corner and the H-plane corner.

For this reason, when transmitting two orthogonal polarized waves at the same time through a square waveguide, there was a problem in that it was not possible to obtain optimal propagation characteristics for both polarized waves having arbitrary guide wavelengths. ．． The present invention has been made in view of these points, and its purpose is to change the propagation directions of electromagnetic waves of two polarizations in a rectangular waveguide that simultaneously propagates electromagnetic waves of two orthogonal polarizations. The objective is to provide a waveguide corner that can simultaneously convert the [Means for Solving the Problems 1] In the present invention, in order to solve the above problems, the first
As shown in Figures 4 to 4, in a rectangular waveguide 1 that simultaneously propagates electromagnetic waves of two orthogonal polarizations, the electromagnetic wave has an inclined surface 2 forming an angle of approximately 45 degrees with respect to the propagation direction, and the position of the inclined surface 2 where the propagation characteristics for the l-th polarized wave are optimal, and the propagation characteristics for the second polarized wave. The waveguide is characterized in that the cross-sectional shape of the waveguide leading to the corner portion is set so that the position of the inclined surface 2 coincides with the optimum position of the waveguide.

[Operation] FIG. 1 is an explanatory diagram of the principle of the present invention. As shown in FIG. 1(a), for a rectangular waveguide whose two sides have lengths A and B, TE is indicated by the arrow in the same figure. Inner wavelength of mode λg+
o is λg+o−λ given by the following formula. /+1-(λ./2A)2}”However,
λ. is the wavelength of electromagnetic waves in vacuum.

In this way, T.E. . In-tube wavelength λg1 of the mode. is, T
E. . The length A of the side perpendicular to the direction of the electric field of the mode and the wavelength λ in vacuum. It is determined by Here, as shown in FIG. 2, two orthogonal polarizations T E o + and TE
,. is propagated from the rectangular waveguide 1 to the L bend, then T
E. , becomes the H-plane corner for the wave, and the TE. . For waves, this is the E-side corner. At this time, once the frequency of the propagating electromagnetic waves is determined, by appropriately selecting the side lengths A and B, the optimal cutting rate at the H-plane corner and the E-plane corner can be determined as shown in Figure 1 (b). Can be made the same.

As a result, TE, . Optimal propagation characteristics can also be obtained for waves. [Embodiment Figure 3 shows an embodiment of the present invention. In the figure, 1 is a rectangular waveguide, and two orthogonal polarized waves are TE.

waves and TE. , has a square cross-sectional shape with side length DXD so that waves propagate simultaneously. An inclined surface 2 is provided at the corner portion so as to form an angle of approximately 45 degrees with respect to the propagation direction of electromagnetic waves. The cross-sectional shape of the waveguide leading to this corner part is tapered, and the lengths of the sides are A and B at the entrance to the corner part and the exit from the corner part. The length of this side A
, B are set to operate at the intersection in FIG. 1(b). As a result, TE,. waves and TE. ．． It is possible to obtain the optimum cut rate (x/y) for both waves. FIG. 4 shows another embodiment of the invention. In this embodiment, the section leading to the corner of the rectangular waveguide 1 is not tapered, but has a square cross-sectional shape with the length of the side at the entrance to the corner and the exit from the corner at EXE. When , the length E of the side is set so that it operates at the intersection shown in FIG. 1(b).

[Effects of the Invention] According to the present invention, approximately four
The cross-sectional shape of the waveguide leading to the corner part was set so that the 5-degree inclined surface provides optimal propagation characteristics for two orthogonal polarized waves, making it possible to create a compact and simple structure. The advantage is that the propagation directions of two orthogonal polarized electromagnetic waves can be changed simultaneously using the corner portions.

[Brief explanation of the drawing]

FIG. 1(a) is a perspective view of a waveguide for explaining the principle of the present invention, FIG. 1(b) is a diagram showing the relationship between the length of the same side and the cut rate, and FIG. 2 is a diagram for explaining the principle of the present invention. A perspective view of the corner part used,
Fig. 3 is a perspective view of one embodiment of the present invention, Fig. 4 is a perspective view of another embodiment of the invention, Fig. 5 is a sectional view of a conventional example, and Fig. 6(a) is another conventional example. A diagram showing the cross-sectional shape of the corner part of
Figures 7(b) and 7(c) are diagrams showing the opening shape of the waveguide section, Figure 7(a) is a diagram showing the cross-sectional shape of the corner part of another conventional example, Figure 7(b), (e) is a diagram showing the opening shape of the waveguide portion same as above. 1 is a rectangular waveguide, and 2 is an inclined surface.

Claims (1)

[Claims] (1) In a rectangular waveguide that simultaneously propagates electromagnetic waves of two orthogonal polarizations, the corner part that converts the propagation direction of the electromagnetic wave to be perpendicular to one pipe wall is placed approximately 45 mm with respect to the propagation direction of the electromagnetic wave. a position of the slope where the propagation characteristics for the first polarized wave are optimal,
A waveguide corner characterized in that the cross-sectional shape of the waveguide leading to the corner portion is set so that the position of the inclined surface coincides with the position where the propagation characteristic for the second polarized wave is optimum.