CN110380161A - A kind of OMT of the microwave frequency band of coaxial waveguide structure - Google Patents

Abstract

The invention discloses an OMT in the microwave frequency band with a coaxial waveguide structure, which is characterized by comprising a circular waveguide and a central metal waveguide arranged coaxially, the central metal waveguide is located in the circular waveguide, and the circular waveguide is located in the circular waveguide. There are orthogonal first standard rectangular waveguide ports and second standard rectangular waveguide ports on the side of the circular waveguide, and the circular waveguides are respectively provided with the first standard rectangular waveguide ports and the second standard rectangular waveguide ports parallel to the first standard rectangular waveguide ports and the second standard rectangular waveguide ports. There are several first metal needles and several second metal needles, one end of each of the first metal needles and each of the second metal needles is connected to the inner wall of the circular waveguide, and the other end is connected to the central metal waveguide. The OMT provided by the present invention adopts the design method of coaxial waveguide, the outer circle realizes the OMT transformation of the low frequency band, and the inner circle realizes the energy transmission of the high frequency band, and the two are concentric. This structure can ensure that the transmission of the two frequency bands can be independent conduct.

Description

A microwave-band OMT with coaxial waveguide structure

technical field

The invention relates to the technical field of microwave antennas, in particular to an OMT of a microwave frequency band with a coaxial waveguide structure.

Background technique

Orthogonal mode converters, also known as dual-mode converters or orthogonal mode (OMT), are an important part of multi-polarization antenna systems and have been widely used for many years. Orthogonal mode converters are used in the project to increase the communication capability of the antenna, either by using two channels with different polarizations and isolated from each other at the same frequency to increase the total number of channels, or by using the orthogonal mode converters. Connect with filter to solve frequency reuse problem.

OMT can realize the transmission and reception of vertical and horizontal polarization signals at the same time. Common OMTs can be divided into two types: separate OMTs and direct-buckle OMTs. The separate OMTs are connected to the ODU through a flexible waveguide, while the direct-buckle OMTs can be directly buckled on the ODU to save the cost of the flexible waveguides. The traditional separate OMT is processed as a whole and has a simple structure. The direct-button OMT needs to be directly connected to the ODU, so the structure is more complicated. However, no matter what form of OMT is, currently it only performs energy transmission in a single frequency band, which has large application limitations.

SUMMARY OF THE INVENTION

Aiming at the problems existing in the prior art, the purpose of the present invention is to provide an OMT with simple structure, low cost, and capable of realizing energy transmission in two frequency bands.

In order to achieve the above objects, the present invention adopts the following technical solutions.

An OMT in the microwave frequency band with a coaxial waveguide structure is characterized in that it comprises a circular waveguide and a central metal waveguide arranged coaxially, wherein the central metal waveguide is located in the circular waveguide, on the side of the circular waveguide. There are orthogonal first standard rectangular waveguide ports and second standard rectangular waveguide ports, and a plurality of first standard rectangular waveguide ports and the second standard rectangular waveguide ports are respectively arranged in the circular waveguide in parallel with the first standard rectangular waveguide ports. A metal needle and a plurality of second metal needles, one end of each of the first metal needles and each of the second metal needles is connected to the inner wall of the circular waveguide, and the other end is connected to the central metal waveguide.

More preferably, the circular waveguide, the first standard rectangular waveguide port, the second standard rectangular waveguide port, and the first metal needle constitute a low-frequency OMT, and the first metal needle and the The second metal needle is mainly used to separate and transmit the polarization energy in the low frequency band; the central metal waveguide mainly transmits the energy in the high frequency band.

More preferably, the central metal waveguide is a metal tube.

More preferably, the first standard rectangular waveguide port and the second standard rectangular waveguide port are arranged back and forth along the axial direction of the circular waveguide.

More preferably, each of the first metal needles is parallel to each other, and each of the second metal needles is parallel to each other.

More preferably, the first metal needle and the second metal needle are respectively arranged behind the corresponding standard rectangular waveguide ports.

More preferably, several adjustment screws are provided in the cavity of the circular waveguide.

More preferably, the main mode propagated by the circular waveguide in the working frequency band is the TE11 mode.

More preferably, the operating frequency band of the OMT is 14.4GHz-15.35GHz, and the central metal waveguide is an 80GHz circular waveguide.

The beneficial effects of the present invention are:

The OMT provided by the present invention adopts the design method of coaxial waveguide, utilizes the outer circular waveguide to realize the OMT conversion of the low frequency band, and utilizes the inner circle central metal waveguide to realize the energy transmission of the high frequency band, the two are concentric, the structure is simple, and the manufacturing cost is low; and , through this structure, the transmission of the two frequency bands can be ensured independently.

Description of drawings

FIG. 1 is a schematic structural diagram of the coaxial waveguide structure OMT provided by the present invention.

FIG. 2 is a cross-sectional view of the coaxial waveguide structure OMT provided by the present invention.

FIG. 3 shows the S-parameter performance of the coaxial waveguide structure OMT provided by the present invention at 15 GHz.

FIG. 4 shows the isolation performance of the coaxial waveguide structure OMT provided by the present invention at 15 GHz.

Description of reference numbers:

1: round waveguide, 2: first standard rectangular waveguide port, 3: second standard rectangular waveguide port, 4: central metal waveguide, 5: first metal pin, 5-1: second metal pin, 6: adjusting screw .

Detailed ways

In the description of the present invention, it should be noted that, for orientation words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower" , "Front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise" ” etc. indicating the orientation and positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or a specific orientation. The structure and operation should not be construed as limiting the specific protection scope of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or indicating the number of technical features. Thus, the definition of "first" and "second" features may expressly or implicitly include one or more of the features, and in the description of the present invention, "at least" means one or more than one, unless otherwise expressly specified. limit.

In the present invention, unless otherwise expressly specified and limited, the terms "assembled", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated It can be connected to the ground; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two components can be connected internally. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the invention, unless otherwise specified and limited, a first feature "on" or "under" a second feature may include that the first and second features are in direct contact, or that the first feature and the second feature are not directly in contact contact but through additional features between them. Also, the first feature being "above", "below" and "above" the second feature includes the first feature being directly above and diagonally above the second feature, or simply denoting that the first feature is at a higher level than the second feature the height of. The first feature being "above", "below" and "below" the second feature includes that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is level below the second feature.

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings in the specification, so as to make the technical solutions of the present invention and the beneficial effects thereof more clear and definite. The embodiments described below by referring to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

Additional aspects and advantages of the present invention will become apparent in the description section that follows, or will be learned by practice of the present invention.

As shown in FIG. 1 and FIG. 2 , an OMT in the microwave frequency band of a coaxial waveguide structure includes: a circular waveguide 1 and a central metal waveguide 4 arranged coaxially, and the central metal waveguide 4 is located in the circular waveguide 1, a first standard rectangular waveguide port 2 and a second standard rectangular waveguide port 3 orthogonal to the side of the circular waveguide 1 are provided, and inside the circular waveguide 1 are provided with the first standard rectangular waveguide port 2 and the first standard rectangular waveguide port 3 respectively. Standard rectangular waveguide port 2, several first metal pins 5 parallel to the second standard rectangular waveguide port 3, several second metal pins 5-1, each of the first metal pins 5 and each of the second metal pins 5 One end of -1 is connected to the inner wall of the circular waveguide 1 , and the other end is connected to the central metal waveguide 4 .

Wherein, the circular waveguide 1 , the first standard rectangular waveguide port 2 , the second standard rectangular waveguide port 3 , and the first metal needle 5 constitute a low-frequency OMT, and the first metal needle 5 and The second metal needle 5-1 is mainly used for the separation and transmission of polarization energy in the low frequency band; the central metal waveguide 4 is a metal tube, which mainly transmits the energy in the high frequency band.

The first standard rectangular waveguide port 2 and the second standard rectangular waveguide port 3 are arranged back and forth along the axial direction of the circular waveguide 1, and the main function is to introduce signals into the cavity of the circular waveguide 1 or from the cavity. body transmitted.

The first metal needles 5 are parallel to each other, the second metal needles 5-1 are parallel to each other, and the first metal needles 5 and the second metal needles 5-1 are respectively arranged at the corresponding standard rectangular waveguide ports. the rear to facilitate reflection of the signal.

Preferably, a plurality of adjusting screws 6 are further provided in the cavity of the circular waveguide 1 for adjusting the standing wave.

Further, the main mode propagating in the working frequency band of the circular waveguide 1 is the TE11 mode.

During the specific operation, the OMT is implemented in that the low-frequency electrical signals are respectively introduced from the first standard rectangular waveguide port 2 and the second standard rectangular waveguide port 3. At this time, the two signals are in an orthogonal state, from the first standard rectangular waveguide The signal input from the waveguide port 2 is short-circuited and reflected by the backward first metal needle 5, and transmitted forward. The signal input from the second standard rectangular waveguide port 3 is reflected backward by the second metal needle 5-1, and is transmitted forward. The central metal waveguide 4 in the middle does not change the polarization of the signal.

3 and 4, the present invention provides an OMT in the microwave frequency band with a coaxial waveguide structure, which is applied to 14.4GHz-15.35GHz, when the central metal waveguide is an 80GHz circular waveguide, two standard rectangular waveguides in the low frequency band The reflection coefficients |S| of the ports are all below -21dB, and the isolation of the two standard rectangular waveguide ports is below -54dB.

Through the description of the above-mentioned structure and principle, those skilled in the art should understand that the present invention is not limited to the above-mentioned specific embodiments, and the improvement and substitution of the technology known in the art on the basis of the present invention all fall within the protection of the present invention Scope, the protection scope of the present invention shall be defined by the respective claims and their equivalents. The parts not described in the detailed description are the prior art or common knowledge.

Claims (9)

1. a kind of OMT of the microwave frequency band of coaxial waveguide structure, which is characterized in that circular waveguide tube and center including coaxial arrangement Metal waveguide, the central metal waveguide are located in the circular waveguide tube, are equipped with orthogonal the in the side of the circular waveguide tube One standard rectangular waveguide mouth, the second standard rectangular waveguide mouth, in the circular waveguide tube be equipped with respectively with the first standard square Parallel several first metal needles of shape waveguide mouth, the second standard rectangular waveguide mouth, several second metal needles, each described first One end of metal needle and each second metal needle connect with the inner wall of the circular waveguide tube, the other end and the central metal wave Lead connection.

2. OMT according to claim 1, which is characterized in that the circular waveguide tube, the first standard rectangular waveguide mouth, The OMT of the second standard rectangular waveguide mouth, first metal needle composition low-frequency range, first metal needle and described second Metal needle is mainly the polarization energy separation and transmission for doing low-frequency range；The central metal waveguide prevailing transmission high band energy.

3. OMT according to claim 1, which is characterized in that the central metal waveguide is metal tube.

4. OMT according to claim 1, which is characterized in that the first standard rectangular waveguide mouth and second standard Setting before and after the axial direction of circular waveguide tube described in rectangular waveguide opening's edge.

5. OMT according to claim 1, which is characterized in that each first metal needle is parallel to each other, each second gold medal Belong to needle to be parallel to each other.

6. OMT according to claim 1, which is characterized in that first metal needle, second metal needle are respectively set At the rear of respective standard rectangular waveguide mouth.

7. OMT according to claim 1, which is characterized in that be equipped with several adjusting spiral shells in the cavity of the circular waveguide tube Nail.

8. OMT according to claim 1, which is characterized in that the main mould that the circular waveguide tube is propagated in working frequency range is TE11 mould.

9. OMT according to claim 1, which is characterized in that its working frequency range is 14.4GHz~15.35GHz, center Metal waveguide is 80GHz circular waveguide.