CN211404690U

CN211404690U - KU wave dual-polarization waveguide

Info

Publication number: CN211404690U
Application number: CN201922035701.XU
Authority: CN
Inventors: 袁萍; 钟艳; 夏畅
Original assignee: Shenzhen X Square Technology Co ltd
Current assignee: Shenzhen X Square Technology Co ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-09-01
Anticipated expiration: 2029-11-22

Abstract

The utility model discloses a KU wave dual polarization waveguide, including the waveguide pipe of hollow structure, the top opening of waveguide pipe connects the waveguide mouth, the bottom of waveguide pipe is sealed, the waveguide still includes via trompil stretch into the inside straight needle and the L type needle of waveguide pipe; the main body of the inner wall of the waveguide tube is of a tubular structure, and the bottom end inside the waveguide tube is a rectangular plane; a first step part, a second step part and a first inclined plane which are symmetrically distributed are sequentially arranged on the long side of the rectangular plane along the height direction; a third vertical surface and a second inclined surface which are symmetrically distributed are sequentially arranged on the short side of the rectangular plane along the height direction; the height of the third vertical surface is greater than the sum of the heights of the first step part and the second step part; the first inclined surface and the second inclined surface are arched surfaces. The method and the device increase filtering and inhibiting by changing the structural size of the waveguide on the premise of not changing the caliber of the existing waveguide and the condition of a testing method, thereby achieving the purpose of phase shifting.

Description

KU wave dual-polarization waveguide

Technical Field

The utility model relates to a microwave communication technology field especially relates to a KU ripples dual polarization waveguide.

Background

The tuner is used for finishing satellite television signals, performing channel selection, signal amplification and frequency reduction processing, and finally outputting stable intermediate frequency signals. The tuner usually comprises a waveguide, one end of the waveguide is connected with the feed source, and a circuit board box is arranged outside the other end of the waveguide.

The waveguide is an important component of the high-frequency tuner, and the structural characteristics of the waveguide have important influence on the performance of the high-frequency tuner. The existing common waveguide has a hollow tubular structure, and has the problems of poor input standing wave and cross polarization interference.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems existing in the prior art, the present application provides a KU wave dual polarization waveguide.

The KU wave dual-polarization waveguide comprises a waveguide tube with a hollow structure, wherein the top end of the waveguide tube is connected with a waveguide port, the bottom end of the waveguide tube is sealed, and the waveguide further comprises a straight needle and an L-shaped needle which extend into the waveguide tube through an opening; the main body of the inner wall of the waveguide tube is of a tubular structure, and the bottom end inside the waveguide tube is a rectangular plane; a first step part, a second step part and a first inclined plane which are symmetrically distributed are sequentially arranged on the long side of the rectangular plane along the height direction; a third vertical surface and a second inclined surface which are symmetrically distributed are sequentially arranged on the short side of the rectangular plane along the height direction; the height of the third vertical plane is greater than the sum of the heights of the first step part and the second step part.

Further, the height of the first inclined plane is greater than the height of the second inclined plane.

Further, the L-shaped needle comprises a first part and a second part, and the second part of the L-shaped needle is perpendicular to the straight needle.

Further, the first step portion includes a first vertical face and a first step face, and the second step portion includes a second vertical face and a second step face; the second part of the L-shaped needle extends into the waveguide from the first vertical surface; the straight needle extends into the waveguide tube from the third vertical surface, and the straight needle is located in the height coverage range of the first inclined surface.

Further, the length < (long side of the rectangular plane/2) of the straight needle extending into the waveguide and the length > (short side of the rectangular plane/2) of the second part of the L-shaped needle extending into the waveguide are provided.

Further, the straight needle is perpendicular to the short side, and the L-shaped needle is perpendicular to the long side.

Further, the distance between a third vertical plane where the straight needle is located and the second part of the L-shaped needle is less than (the long side of the rectangular plane/2); the straight needle is arranged in the middle.

Further, the inner wall of the waveguide port is provided with a plurality of tooth-shaped structures.

The utility model discloses following beneficial effect has:

according to the method, the problems of poor standing wave input and cross polarization interference of a common waveguide are solved, and the filtering and inhibiting are increased by changing the structural size of the waveguide on the premise of not changing the caliber of the conventional waveguide and the testing method, so that the phase shifting purpose is achieved.

Drawings

Fig. 1 is a first schematic perspective view of a KU-wave dual-polarized waveguide provided by the present invention;

fig. 2 is a second schematic perspective view of a KU wave dual-polarized waveguide provided by the present invention;

fig. 3 is a cross-sectional view of a KU-wave dual-polarized waveguide provided by the present invention along a first direction of an axis;

fig. 4 is a cross-sectional view of a KU-wave dual-polarized waveguide along a second direction of the axis according to the present invention;

fig. 5 is a third schematic perspective view of a KU wave dual-polarized waveguide provided by the present invention;

fig. 6 is a side view of the KU-wave dual-polarized waveguide provided by the present invention along the axis.

Reference numerals:

10-waveguide tube, 11-inner wall body, 12-bottom end, 112-long edge, 111-short edge, 13-first step part, 14-second step part, 15-first inclined surface, 131-first vertical surface, 132-first step surface, 141-second vertical surface, 142-second step surface, 16-third vertical surface, 17-second inclined surface, 101-circular opening, 102-groove opening, 20-wave guide port, 21-tooth structure, 31-straight needle, 32-L-shaped needle, 321-first part and 322-second part.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

As shown in fig. 1-6, the utility model discloses a KU wave dual polarization waveguide.

The waveguide includes a waveguide tube 10 having a hollow structure and a waveguide port 20. Wherein, the top end of the waveguide tube 10 is connected with the waveguide port, and the bottom end 12 of the waveguide tube 10 is closed. The waveguide 10 and the waveguide port 20 may be an integrated structure or a split structure.

Functionally differentiated, the waveguide includes a transition feed portion, a transmission portion, and a radiation portion. The waveguide port is a radiation part and is connected with a feed source. The waveguide 10 includes a transition feeding portion and a transmission portion. The transition feeding portion is located at the lower portion of the waveguide 10. The transmission portion is located between the conversion feeding portion and the radiation portion. The transmission part is used for energy transmission.

A probe is provided at the transition feed portion and excites the circular waveguide with the probe, the probe having an outer conductor and an inner conductor, an inner conductor extension portion of the probe being inserted into the transition feed portion. The probe comprises a straight needle 31 and an L-shaped needle 32. The straight needle 31 projects into the waveguide 10 through the circular opening 101, and the L-shaped needle 32 projects into the waveguide 10 through the slot-shaped opening 102.

In this embodiment, the inner wall body 11 of the waveguide 10 is a tubular structure having an axis. The bottom end 12 of the waveguide 10 is a rectangular planar structure having a long side 112 and a short side 111. On the long side 112 of the rectangular plane, a first step portion 13, a second step portion 14, and a first slope 15 are provided in this order in the height direction. The number of the first step portions 13, the number of the second step portions 14, and the number of the first slopes 15 are two, and the first step portions, the second step portions, and the first slopes are symmetrically distributed with respect to the axis. At the short side 111 of the rectangular plane, a third vertical surface 16 and a second inclined surface 17 are provided in this order in the height direction (the direction in which the axis is located is the height direction). The number of the first vertical surfaces 131 and the number of the second inclined surfaces 17 are two, and the first vertical surfaces and the second inclined surfaces are symmetrically distributed relative to the axis. The first step portion 13 includes a first vertical face 131 and a first step face 132, and the second step portion 14 includes a second vertical face 141 and a second step face 142. The bottom edge of the first vertical face 131 is the long side 112 of the rectangular plane. The bottom edge of the third vertical face 16 is the short side 111 of the rectangular plane. Wherein the height of the third vertical surface 16 is greater than the sum of the heights of the first and

second step portions

13 and 14. The first step surface 132 and the second step surface 142, which are parallel to each other, may or may not be parallel to the rectangular plane of the bottom of the waveguide.

The first inclined surface 15 and the second inclined surface 17 respectively form a certain included angle (acute angle) with the axis of the waveguide tube. The tubular intersection line of the first inclined plane 15 and the inner wall is arched, the tubular intersection line of the second inclined plane 17 and the inner wall is also arched, and the first inclined plane 15 and the second inclined plane 17 can also be called arched surfaces. The first inclined surface 15 is at a greater height than the second inclined surface 17.

In this embodiment, no spacer bar of conventional design is provided at the transition feeding portion. The design has more stable isolation effect, does not have the deflection problem caused by processing the isolating rod by the common waveguide, and saves the labor and material cost.

For the design of a dual-mode dual-frequency horn, a method for exciting, controlling and using a higher-order mode is adopted, and various waveguides are adopted to transmit electric shock wave energy in a microwave band. In the prior art, the commonly used waveguides are rectangular and circular, and the terminal openings of the waveguides are formed into waveguide radiators, so that the main mode transmission is realized in a receiving frequency band. In the embodiment, the truncated cone is connected with the truncated pyramid, the step is a discontinuous section, the main mode TE11 and the required high-order mode are transmitted in the circular waveguide, and the unnecessary high-order mode TM01 is cut off due to the fact that the conductor wall is discontinuous (the third vertical surface 16 is not connected with the second step part 14), so that the accuracy of the structural size is easy to control, the port isolation is improved, and the feed size is shortened.

When a TE mode and a TM mode are propagated in a conventional waveguide and a KU wave dual-mode is transmitted, although the longitudinal size of the waveguide is reduced to a certain degree by the arrangement of an isolating rod (a reflecting column), only part of fields of a receiving frequency band can be reflected, the isolation degree of a port is relatively poor, and the isolating effect of a dual-polarization is greatly influenced by an isolating rod processing process and is difficult to accurately control.

In addition, by this design, the waveguide 10 can be divided into five regions in the height direction according to the cross-sectional shape of the waveguide 10. The area range corresponding to the first step portion 13 is a first height area. In the first height region, the cross-sectional shape of the waveguide 10 is a rectangular cross-section. The area range corresponding to the second step portion 14 is a second height area. In the second height region, the cross-sectional shape of the waveguide 10 is a mixed cross-section one of rectangular and circular. The area between the third vertical face 16 and the second step portion 14 ranges as a third height area. In the third height region, the cross-sectional shape of the waveguide 10 is a mixed cross-section of a rectangular shape and a circular shape. The range of the area corresponding to the second slope 17 is a fourth height area. In the fourth height region, the cross-section of the waveguide 10 is approximately circular. The fifth height region, in which the cross-sectional shape of the waveguide 10 is circular, is located above the fourth height region.

The conversion feeding part comprises a first height area, a second height area and a third height area, and is in a frustum pyramid structure. The transmission part comprises a fourth height area and a fifth height area, and the transmission part is in a circular truncated cone structure. The cross-sectional area of the waveguide 10 from the first height region to the fifth height region gradually increases in the height direction. The transition part from the frustum to the round platform is connected through arched surfaces (15, 17).

In this embodiment, the waveguide is designed to be gradually opened, and the electromagnetic waves are transmitted along the gradually opened waveguide and are sequentially transmitted to the fifth height region along the first height region. The gradually-opened transition sections (namely the arched surfaces 15 and 17) can ensure that the waveguide is well matched with the space, the reflection of the aperture surface is small, the radiation directivity is enhanced, the adjustment of the return loss in a receiving frequency band is actively performed, and the input standing wave ratio of the waveguide is smaller than 1.5 dB; meanwhile, the matching effect in the input end is improved, the waveguide section from the step to the bell mouth surface is a phase shifting section, the function of the phase shifting section is to adjust the relative phase of the main mode and the higher mode, and the proper phase relation exists on the mouth surface.

The waveguide 10 of the present embodiment has a structure in which the wall thickness is substantially not much different, and therefore the inner and outer wall shapes at the first step portion, the second step portion, the first slope, the third vertical surface, the second slope, and the like are similar. The three-dimensional structures shown in fig. 1 and 2 can more intuitively reflect the shapes of the first step portion 13, the second step portion 14, the first inclined surface 15, the third vertical surface 16 and the second inclined surface 17.

In order to further improve the matching performance of the circular waveguide converter, the insertion depth of the probe and the position of the probe in the waveguide are adjusted. In this embodiment, the straight needle 31 and the L-shaped needle 32 are perpendicular and have a phase difference of 90 degrees. The straight needles 31 are perpendicular to the short sides 111 and the L-shaped needles 32 are perpendicular to the long sides 112.

Probes 90 degrees out of phase are used to receive vertical and horizontal radio frequency signals. The L-shaped needle 32 includes a first portion 321 and a second portion 322, the first portion 321 of the L-shaped needle 32 is parallel to the straight needle 31, and the second portion 322 of the L-shaped needle 32 is perpendicular to the straight needle 31. The second portion 322 of the L-shaped pin 32 protrudes from the first vertical surface 131 into the waveguide 10, and the L-shaped pin 32 is located at the height coverage of the first step portion 13. A straight needle 31 projects from the third vertical surface 16 into the interior of the waveguide 10, the straight needle 31 being located at the height coverage of the first ramp 15.

Insertion depth of the probe: in the prior art, the length < (long side of rectangular plane/2) of the straight needle 31 protruding into the waveguide 10, and the length < (short side of rectangular plane/2) of the second portion 322 of the L-shaped needle 32 protruding into the waveguide 10.

Unlike the prior art, in the present embodiment, the straight needle 31 projects into the waveguide 10 by a length < (long side of rectangular plane/2). The length of the second portion 322 of the L-shaped pin 32 that extends into the interior of the waveguide 10 (short side/2 of the rectangular plane). Since the waveguide 10 is deep and needs a certain draft angle at the time of manufacturing, the present application (long side/2 of the rectangular plane) should be understood as half the distance between the two third vertical planes symmetrically disposed at the height position of the straight needle 31. Likewise, (short side/2 of the rectangular plane) is to be understood as half the distance between two first vertical faces 131 symmetrically arranged at the height position of the L-shaped needle 32.

The L-shaped pin 32 is a waveguide-coaxial transition structure, and its transmission line is a structure for transmitting TEM mode. The characteristic impedance of the waveguide is generally 50 ohms, and the L-shaped needle 32 effectively converts a TE11 mode with the characteristic impedance of hundreds of ohms in the waveguide into a TEM mode through electric coupling, and the waveguide is equivalent to a small antenna. The length of the L-shaped needle extending into the waveguide is greater than the short side 1/2, so that the length of the L-shaped needle 32 extending into the waveguide is usually about 1/4 of the central frequency wavelength of the working frequency band, and through calculation and debugging, feed coupling is enhanced, and the distance from the short-circuit surface meets the matching condition.

In this embodiment, the second portion 322 of the L-shaped needle 32 is parallel to the third vertical plane 16, and the third vertical plane 16 where the straight needle 31 is located is less than the distance (the long side of the rectangular plane/2) from the second portion 322 of the L-shaped needle 32. The straight needle 31 is centrally arranged with respect to the first vertical surface 131, and an extension of the straight needle 31 intersects with an axis of the waveguide 10.

In the embodiment, in order to solve the problems of poor standing wave input and cross polarization interference of a common waveguide, the filtering and the suppression are increased by changing the structural size of the waveguide on the premise of not changing the caliber of the conventional waveguide and the testing method, so that the phase shifting purpose is achieved. The waveguide structure of the embodiment can effectively improve standing waves and cross polarization phenomena through simulation comparison data.

In addition, the waveguide port radiation portion has a receiving cavity whose inner wall is formed in a bell mouth shape close to the waveguide 10. A plurality of tooth-shaped structures 21 are uniformly distributed at the bell mouth. Because the tooth-shaped horn radiation port is adopted, the side lobe is effectively inhibited, the rotational symmetry performance of a directional diagram is improved, the cross polarization of the horn antenna is reduced, and the gain is greatly improved compared with that of a simple circular waveguide opening antenna.

The utility model discloses following beneficial effect has:

It will be understood that modifications and variations can be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the appended claims.

Claims

1. A KU wave dual-polarization waveguide comprises a waveguide tube with a hollow structure, wherein the top end of the waveguide tube is connected with a waveguide port, the bottom end of the waveguide tube is closed, and the waveguide further comprises a straight needle and an L-shaped needle which extend into the waveguide tube through an opening; it is characterized in that the preparation method is characterized in that,

the main body of the inner wall of the waveguide tube is of a tubular structure, and the bottom end inside the waveguide tube is a rectangular plane; a first step part, a second step part and a first inclined plane which are symmetrically distributed are sequentially arranged on the long side of the rectangular plane along the height direction; a third vertical surface and a second inclined surface which are symmetrically distributed are sequentially arranged on the short side of the rectangular plane along the height direction; the height of the third vertical surface is greater than the sum of the heights of the first step part and the second step part; the first inclined surface and the second inclined surface are arched surfaces.

2. The KU wave dual polarized waveguide according to claim 1, wherein the first inclined plane is at a greater height than the second inclined plane.

3. The KU wave dual polarized waveguide of claim 1, wherein the L-shaped pin comprises a first portion and a second portion, the second portion of the L-shaped pin being perpendicular to the straight pin.

4. The KU wave dual polarized waveguide according to claim 3, wherein the first step portion comprises a first vertical face and a first step face, and the second step portion comprises a second vertical face and a second step face; the second part of the L-shaped needle extends into the waveguide from the first vertical surface; the straight needle extends into the waveguide tube from the third vertical surface, and the straight needle is located in the height coverage range of the first inclined surface.

5. The KU wave dual polarization waveguide of claim 3, wherein the straight needle extends into the waveguide for a length < (long side of rectangular plane/2) and the second portion of the L-shaped needle extends into the waveguide for a length > (short side of rectangular plane/2).

6. The KU wave dual polarized waveguide of claim 4, wherein the straight pins are perpendicular to the short sides and the L-shaped pins are perpendicular to the long sides.

7. The KU wave dual polarized waveguide of claim 4, wherein the distance between the third vertical plane where the straight needle is located and the second part of the L-shaped needle is < (long side of rectangular plane/2); the straight needle is arranged in the middle.

8. The KU wave dual polarized waveguide as claimed in claim 1, wherein the waveguide port has a plurality of teeth on an inner wall thereof.