CN204391227U - A kind of K-band rectangle TE10-circular waveguide TE01 mode transition structure of practicality - Google Patents

Abstract

This patent belongs to microwave and millimeter wave wave source technical field, a kind of K-band rectangle TE10-circular waveguide TE01 mode transition structure of practicality is provided, the left end cross section of described structure is rectangle, fade to T section to the right, fade to the square-section with left end cross section orthogonal to the right, fade to X-shaped cross section to the right, low order end fades to circular cross-section.Be mainly used in ranging radar antenna feed technology.

Description

A kind of K-band rectangle TE10-circular waveguide TE01 mode transition structure of practicality

Technical field

This patent belongs to microwave and millimeter wave wave source technical field, is mainly used in ranging radar antenna feed technology.

Background technology

In large-scale floating roof fluid reservoir, liquid storage often has stirring, makes radar level gauge to ensure certainty of measurement, at this moment needs to install instructor in broadcasting's pipe additional and brings trueness error to eliminate liquid storage stirring.And some liquid storage has certain corrosivity, will make after Long-Time Service to occur corrosion in waveguide pipe tube wall, huge on the roughness impact of tube wall surface, even affect the geometry of tube wall surface.The geometry distortion of instructor in broadcasting's tube wall must make the attenuation of linear polarized antenna sharply increase, and range significantly reduces.

Circular waveguide TE01 mould electromagnetic wave is when circle instructor in broadcasting manages interior propagation, and having whole waveguide pipe wall surface electric field very little, is even zero.So because of the corrosivity of liquid storage, can not impact the transmission of circular electric wave TE01 on the structural aberration that guided wave tube wall causes or affect very little.If therefore use TE01 ripple as the excitation of radar level gauge antenna, adopt waveguide pipe transmission radiation signal, both can eliminate the impact that liquid storage tank level stirs, and its range can have been ensured again.

But at present as driving source, the higher mode TE01 of circular waveguide can not directly obtain, need by other conventional transmission line formal transformations, as coaxial line or rectangular waveguide etc.The conversion regime of reasonable has rectangular waveguide TE10-circular waveguide TE01, as: serpentine is micro-around structure, circumferential weld coupled structure etc.But still the requirement of engineer applied aspect cannot be met.

Summary of the invention

Goal of the invention: a kind of K-band rectangle TE10-circular waveguide TE01 mode transition structure of practicality, as the driving source of radar level gauge antenna in floating roof fluid reservoir, find range after antenna installs waveguide pipe additional, the loss that the corrosion of guided wave tube wall causes can be eliminated, can range be ensured again.

Technical scheme: a kind of K-band rectangle TE10-circular waveguide TE01 mode transition structure of practicality, the left end cross section of described structure is rectangle, fades to T section to the right, fades to the square-section with left end cross section orthogonal to the right, fade to X-shaped cross section to the right, low order end fades to circular cross-section.

Beneficial effect:

(1) compared to circumferential weld coupled structure wider of similar series feed principle, equally matched around structure micro-with serpentine, has the bandwidth of 2G, VSWR≤1.1 in K-band;

(2) TE01 ripple purity >=99.5% of excitation acquisition;

(3) size of this structure is similar but bandwidth is wider compared with circumferential weld coupled structure, with serpentine micro-compared with the structure bandwidth suitable, size is far little, its size range≤Ф 19.3mm × 110mm;

Accompanying drawing explanation

Fig. 1 is the utility model rectangle TE10-circular waveguide TE01 mode transition structure schematic diagram.

Fig. 2 is the utility model rectangle TE10-circular waveguide TE01 mode transition procedure schematic diagram.

Embodiment

A K-band rectangle TE10-circular waveguide TE01 mode transition structure for practicality, as shown in Figure 1, the left end cross section of described structure is rectangle, fade to T section to the right, fade to the square-section with left end cross section orthogonal to the right, fade to X-shaped cross section to the right, low order end fades to circular cross-section.

As shown in Figure 2, in figure, the direction of arrow is direction of an electric field.By the conversion of rectangular waveguide TE10 to circular waveguide TE01, there are three switch process: be 1) that relay structure makes rectangular waveguide TE10 ripple gradually be converted to TE20 ripple in rectangular waveguide by T-type structure; 2) rectangular waveguide crossfades into cross waveguide, and corresponding rectangular waveguide TE20 ripple is converted to the TE22 ripple in cross waveguide; 3) cross waveguide TE22 ripple is converted to circular waveguide TE01 ripple.

This patent solves following technical problem:

1) realize the efficiency of TE10-TE01 patten transformation 99%, ensure that the excited modes purity of conical-horn antenna;

2) significantly reduce size, be about 1/4 of Theoretical Design size, meet miniaturized engineer applied requirement;

3) other electrical performance indexes meet engineer applied requirement, and processing cost is low.

Claims (1)

1. a practical K-band rectangle TE10 ?circular waveguide TE01 mode transition structure, it is characterized in that, the left end cross section of described structure is rectangle, fade to T section to the right, fade to the square-section with left end cross section orthogonal to the right, fade to X-shaped cross section to the right, low order end fades to circular cross-section.