CN214099918U - Dielectric loading waveguide circular polarizer - Google Patents

Abstract

The utility model discloses a medium loading waveguide circular polarizer belongs to waveguide technical field. The microwave cavity comprises a square waveguide and a microwave dielectric plate vertically arranged in the square waveguide; the extending direction of the square waveguide cavity is the same as the extending direction of the microwave dielectric plate, and the tail ends of the square waveguide cavity and the tail ends of the microwave dielectric plate are on the same plane; the microwave dielectric plate divides the square waveguide cavity into a left part and a right part; the right surface of the microwave medium plate is provided with a folded strip line and an inclined strip line, and the left surface is provided with a metal ground and a metal plate. The utility model discloses increase characteristics that have miniaturization, bandwidth width, compact structure, low cost.

Description

Dielectric loading waveguide circular polarizer

Technical Field

The utility model relates to waveguide technical field, in particular to medium loading waveguide circular polarizer.

Background

At present, the frequency spectrum of communication in the satellite communication field is wider and higher, and the requirement on radio frequency terminals is higher and higher, so that the working bandwidth of the antenna is required to be widened gradually. The waveguide polarization conversion device is taken as a main component in a circularly polarized satellite communication antenna network system and is increasingly paid attention by engineering technicians, qualified experts and relevant scholars, and the excellent degree of the performance of the waveguide polarization conversion device directly influences the quality of satellite communication.

The waveguide circular polarizer at present mainly has the following forms:

1. the partition plate circular polarization device: the polarizer is a classical waveguide polarization conversion device and is characterized in that the bandwidth is about 20%, and the left-handed and right-handed simultaneous operation is realized, but the polarizer has the problems that the relative size is large, the longitudinal length of 10 wavelengths is needed, and the polarizer is limited by space installation in a small-caliber reflecting surface feed network system and cannot meet the use requirement;

2. the medium piece circular polarizer: the circular polarization device has the advantages that the medium sheet is inserted into the square waveguide (circular waveguide), the structure is compact, the power capacity is moderate, and the circular polarization device has the defects that the circular polarization axial ratio bandwidth is limited by the working principle of the circular polarization device and cannot meet the bandwidth of most standard satellite communication frequency spectrums;

3. ripple circular polarizer: the circular polarizer can realize broadband performance, and realize broadband phase shift value in 1.5 frequency doubling by loading stepped corrugations on a square waveguide (circular waveguide), so that high-performance circular polarization radiation in the broadband is realized, but the circular polarizer is large and heavy in structural size, and a small-caliber antenna surface is not easy to mount.

4. Add ridge ripple structure circular polarizer: the form is similar to the performance of a corrugated circular polarizer, and the broadband shift connection is realized in 2 frequency doubling steps by loading stepped corrugations in ridge waveguides, so that the high-performance circular polarization radiation in the broadband is realized, but the structure of the broadband circular polarization radiation is large and heavy, and the broadband circular polarization radiation is not suitable for being used for installing a small-caliber reflector antenna microwave network system.

The waveguide polarizers have the advantages and disadvantages, and although the characteristics of individual indexes are excellent, the common defects of the waveguide polarizers are large size and heavy structure, and the installation requirements of the small-caliber reflecting antenna cannot be met.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a dielectric loading waveguide circular polarizer. The circular polarizer has the characteristics of miniaturization, wide bandwidth, compact structure and low cost.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a medium loading waveguide circular polarizer comprises a square waveguide and a microwave medium plate vertically arranged in the square waveguide; the extending direction of the square waveguide is the same as that of the microwave dielectric plate, and the tail ends of the square waveguide and the tail ends of the microwave dielectric plate are on the same plane; the microwave dielectric plate divides the square waveguide cavity into a left part and a right part;

the right surface of the microwave dielectric plate is provided with a folded strip line and an inclined strip line; the folding strip line comprises an initial section, a middle section and an inclined section, wherein the initial section and the middle section extend inwards from the tail end of the microwave dielectric plate, and the length and the width of the middle section are both greater than those of the initial section; the included angle between the inclined section and the middle section is larger than 90 degrees; the oblique strip line is parallel to the oblique section, and four end points of the oblique strip line and the oblique section are respectively provided with a through hole and extend to the left surface of the microwave dielectric plate; the left surfaces of the inclined sections and the microwave dielectric plate are provided with two strip lines which are parallel to each other; each strip line is connected with two different via holes;

the left surface of the microwave dielectric plate is also provided with a metal ground, the metal ground is connected with the inclined end, and the other side of the metal ground is connected with a metal plate vertical to the microwave dielectric plate; the metal plate, the inner wall of the square waveguide cavity, the microwave dielectric plate and the extension of the tail part of the square waveguide to the microwave dielectric plate form a closed cavity to form a back cavity structure; the square waveguide cavity is provided with an opening structure on the right side of the microwave dielectric plate to form a rectangular waveguide feeder line.

Furthermore, a boss integrated with the square waveguide cavity is further arranged in the closed cavity, and the boss is tightly attached between the extension of the square wave guide microwave dielectric plate and the metal plate.

The utility model adopts the beneficial effect that above-mentioned technical scheme produced lies in:

1. the utility model discloses waveguide polarization conversion equipment has compact structure, and is simple, characteristics that the size is little.

2. The utility model discloses waveguide polarization conversion equipment utensil 90 phase shift bandwidth is 20%, can satisfy most earth station to the technical requirement of antenna feeder network.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic view of the right surface of the microwave dielectric plate.

Fig. 3 is a schematic view of the left surface structure of the microwave dielectric plate.

Fig. 4 is a cross-sectional view of fig. 1.

In the figure: 1. square waveguide, 2, microwave dielectric plate, 3, metal ground, 4, metal plate, 5, folded strip line, 6, oblique strip line, 7, first strip line, 8, second strip line, 9 and lug boss.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

A medium loading waveguide circular polarizer comprises a square waveguide and a microwave medium plate vertically arranged in the square waveguide; the extending direction of the square waveguide is the same as that of the microwave dielectric plate, and the tail ends of the square waveguide and the tail ends of the microwave dielectric plate are on the same plane; the microwave dielectric plate divides the square waveguide cavity into a left part and a right part;

the right surface of the microwave dielectric plate is provided with a folded strip line and an inclined strip line; the folding strip line comprises an initial section, a middle section and an inclined section, wherein the initial section and the middle section extend inwards from the tail end of the microwave dielectric plate, and the length and the width of the middle section are both greater than those of the initial section; the included angle between the inclined section and the middle section is larger than 90 degrees; the oblique strip line is parallel to the oblique section, and four end points of the oblique strip line and the oblique section are respectively provided with a through hole and extend to the left surface of the microwave dielectric plate; the left surfaces of the inclined sections and the microwave dielectric plate are provided with two strip lines which are parallel to each other; each strip line is connected with two different via holes;

the left surface of the microwave dielectric plate is also provided with a metal ground, the metal ground is connected with the inclined end, and the other side of the metal ground is connected with a metal plate vertical to the microwave dielectric plate; the metal plate, the inner wall of the square waveguide cavity, the microwave dielectric plate and the extension of the tail part of the square waveguide to the microwave dielectric plate form a closed cavity to form a back cavity structure; the square waveguide cavity is provided with an opening structure on the right side of the microwave dielectric plate to form a rectangular waveguide feeder line.

Furthermore, a boss integrated with the square waveguide cavity is further arranged in the closed cavity, and the boss is tightly attached between the extension of the square wave guide microwave dielectric plate and the metal plate.

The following is a more specific example:

as shown in fig. 1 to 4, the present embodiment includes a square waveguide 1 and a microwave dielectric slab 2, the microwave dielectric slab 2 is embedded inside a waveguide cavity, and one side of an initial end of the square waveguide cavity is a rectangular waveguide port, which is an equipment network interface; the other side is a back cavity structure and an opening structure; the open structure end of the square waveguide cavity is a square waveguide interface which is fed and connected with the feed source;

specifically, the square waveguide cavity is mainly divided into three parts, namely a square waveguide feeder section, a back cavity section and a rectangular waveguide feeder section; the three-section structure is integrated by adopting a numerical control milling machine processing technology;

the section of the inner cavity of the square waveguide cavity is square, and one end of the square waveguide cavity is a feed source interface and is connected with a feed source; the length of the square waveguide cavity is about 1.25 lambda₀. The length of the square waveguide cavity depends on the length of the internally arranged microwave printed board, and the position of the square waveguide port of the square waveguide cavity exceeds 0.03 lambda of the extended position length of the microwave medium board₀。

The right surface of the microwave dielectric plate is provided with a folded strip line 5 and an inclined strip line 6; the folding strip line comprises an initial section, a middle section and an inclined section, wherein the initial section and the middle section extend inwards from the tail end of the microwave dielectric plate, the size of the middle section is larger than that of the initial section, and the length and the width of the middle section are both larger than those of the initial section; the other end of slope section and interlude is connected, and the contained angle between the two is 125.

The oblique strip line is parallel to the oblique section, and four end points of the oblique strip line and the oblique section are respectively provided with a through hole and extend to the left surface of the microwave dielectric plate; the left surfaces of the inclined sections and the microwave medium plate are provided with two strip lines which are parallel to each other and are respectively a first strip line 7 and a second strip line 8; each strip line is connected with two different via holes. The first strip line and the second strip line are connected with the inclined section and the inclined strip line.

A metal ground 3 is also arranged on the left surface of the microwave dielectric plate and is connected with the initial through hole of the inclined end, and the other side of the metal ground is connected with a metal plate 4 vertical to the microwave dielectric plate; the metal plate, the inner wall of the square waveguide cavity, the microwave dielectric plate and the extension of the tail part of the square waveguide to the microwave dielectric plate form a closed cavity to form a back cavity structure; the square waveguide cavity is of an open structure on the right side of the microwave dielectric plate.

And a boss 9 integrated with the square waveguide cavity is further arranged in the closed cavity, and the boss is tightly attached between the extension of the square wave guide microwave dielectric plate and the metal plate.

The thickness of the microwave dielectric plate is 1mm, the value is limited to that the working frequency band is below 18GHz, and when the frequency is higher than 18GHz, the microwave dielectric plate can select proper thickness according to simulation calculation;

the waveguide polarization conversion device mainly comprises two main parts, namely a square waveguide cavity and a microwave dielectric plate, wherein flange interfaces are arranged at two ends of the square waveguide cavity and are respectively arranged at a feed source and an equipment network, the equipment network is mechanically installed, the structure is compact, the miniaturization design is greatly reduced compared with the traditional polarizer, the length of an inner cavity is only 5 lambda₀And the advantages are obvious.

The working principle of the polarization conversion device is as follows: when a transmission signal enters the opening structure, TE of an appropriate amount is excited in the opening structure by an electric field perpendicular to the long side₀₁The electromagnetic wave excites the initial section of the folded strip line in the rectangular waveguide section, the middle section is an impedance transformation section, material number matching is realized, signals enter the inclined section, the inclined section transmits the signals to the first strip line through the via hole, so that the signals enter the inclined strip line and the second strip line in sequence and are conducted with a metal ground, a path through which the signals flow forms an 'annular loop', vortex current is generated, the vortex current excites a vortex electric field of the vortex electric field in the square waveguide cavity, and finally, circularly polarized signals are radiated to a free space through radiation of the feed source horn, and the flowing process of the signals is completed to convert the linearly polarized signals into the circularly polarized signals.

Claims (2)

1. A medium loading waveguide circular polarizer comprises a square waveguide and a microwave medium plate vertically arranged in the square waveguide; the microwave dielectric slab is characterized in that the extending direction of the square waveguide is the same as the extending direction of the microwave dielectric slab, and the tail ends of the square waveguide and the tail ends of the microwave dielectric slab are on the same plane; the microwave dielectric plate divides the square waveguide cavity into a left part and a right part;

the right surface of the microwave dielectric plate is provided with a folded strip line and an inclined strip line; the folding strip line comprises an initial section, a middle section and an inclined section, wherein the initial section and the middle section extend inwards from the tail end of the microwave dielectric plate, and the length and the width of the middle section are both greater than those of the initial section; the included angle between the inclined section and the middle section is larger than 90 degrees; the oblique strip line is parallel to the oblique section, and four end points of the oblique strip line and the oblique section are respectively provided with a through hole and extend to the left surface of the microwave dielectric plate; the left surfaces of the inclined sections and the microwave dielectric plate are provided with two strip lines which are parallel to each other; each strip line is connected with two different via holes;

the left surface of the microwave dielectric plate is also provided with a metal ground, the metal ground is connected with the inclined end, and the other side of the metal ground is connected with a metal plate vertical to the microwave dielectric plate; the metal plate, the inner wall of the square waveguide cavity, the microwave dielectric plate and the extension of the tail part of the square waveguide to the microwave dielectric plate form a closed cavity to form a back cavity structure; the square waveguide cavity is provided with an opening structure on the right side of the microwave dielectric plate to form a rectangular waveguide feeder line.

2. The dielectric loaded waveguide circular polarizer of claim 1, wherein a boss integrated with the square waveguide cavity is further disposed in the closed cavity, and the boss is tightly attached between the extension of the square wave guide microwave dielectric plate and the metal plate.

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