CN216903290U

CN216903290U - Millimeter wave coaxial-waveguide transition structure

Info

Publication number: CN216903290U
Application number: CN202220460476.3U
Authority: CN
Inventors: 姚常飞; 刘甲俊; 林昊; 崔灿; 顾希雅; 张炎; 凌清岚
Original assignee: Nanjing University of Information Science and Technology
Current assignee: Nanjing University of Information Science and Technology
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2022-07-05
Anticipated expiration: 2032-03-04

Abstract

The utility model discloses a millimeter wave coaxial-waveguide transition structure which comprises a J.2.92-KFDB3 joint, a coaxial inner conductor, an insulator, an air cavity, a coaxial probe and a waveguide, wherein a broadside opening is arranged above the waveguide, the coaxial probe is arranged in the waveguide, one side of the coaxial inner conductor sequentially penetrates through the insulator, the air cavity and the broadside opening from top to bottom to be fixedly connected with the coaxial probe, and the other side of the coaxial inner conductor is fixedly connected with the J.2.92-KFDB3 joint. The utility model solves the problems of non-sealing and non-flexible transmission mode and the like of the traditional transition mode, and designs the millimeter wave coaxial-waveguide transition structure with low loss, wide frequency band, small standing wave and good sealing.

Description

Millimeter wave coaxial-waveguide transition structure

Technical Field

The utility model relates to the technical field of microwave and millimeter wave, in particular to a millimeter wave coaxial-waveguide transition structure.

Background

With the development of modern millimeter wave transceiving component technology, high frequency band, small volume and integration become trends, the design requirements of components cannot be met in a single-layer transmission mode in the general traditional sense, the problem of volume limitation of the transceiving components can be well solved through multi-layer signal transmission, and the components are made to be possible to be miniaturized. With the multi-layer signal transmission form, a transmission transition problem between signals is introduced, which requires selecting a suitable transmission form between different signals for signal interconnection.

The coaxial body has the greatest advantages that the transmission form is flexible, good sealing performance can be guaranteed before and after the transmission link, in addition, a coaxial probe transition structure is introduced into the coaxial-waveguide end, and the coaxial-waveguide transition is realized by optimizing the size of the coaxial probe and the position away from the end face of the waveguide port through design.

In the microwave and millimeter wave field, waveguide-coaxial transition is developed, but device performance indexes are still different from those of foreign countries in terms of excellent products, and with rapid development of millimeter wave technology and military requirements of the country, development of coaxial systems and waveguide conversion devices is increasingly carried out in these years. Various coaxial connectors, coaxial-waveguide transition devices and other devices play a crucial role in the microwave and millimeter wave fields, and due to the requirements on the millimeter wave coaxial conversion technology, the development of various devices, particularly waveguide coaxial transition, is further promoted, so that the research on the aspects is also particularly important.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a millimeter wave coaxial-waveguide transition structure which is low in loss, wide in frequency band, small in standing wave and good in sealing, and aims to solve the technical problem of interconnection of multiple layers of signals in a millimeter wave transceiving component.

In order to achieve the purpose, the specific technical scheme of the millimeter wave coaxial-waveguide transition structure is as follows:

the utility model provides a coaxial-waveguide transition structure of millimeter wave, includes that J.2.92-KFDB3 connects, coaxial inner conductor, insulator, air chamber, coaxial probe, waveguide, the waveguide top is equipped with the broadside opening, coaxial probe sets up inside the waveguide, coaxial inner conductor one side is from last to passing insulator, air chamber, broadside opening and coaxial probe fixed connection down in proper order, coaxial inner conductor opposite side and J.2.92-KFDB3 connect fixed connection.

Further, the waveguide adopts a standard BJ320 waveguide.

Further, the insulator adopts a standard 290-06G insulator.

Further, the coaxial probe is provided with a sleeve for reducing the insertion loss of the coaxial probe.

Further, the waveguide is provided with a short-circuit piston for ensuring that the coaxial probe is at maximum voltage within the waveguide.

Compared with the prior art, the utility model has the beneficial effects that: according to the millimeter wave coaxial-waveguide transition structure, waveguide transmission has the advantages of small transmission loss and high power capacity, coaxial transmission has the advantages of small volume, light weight, easiness in integration and the like, and the millimeter wave coaxial-waveguide transition structure has the advantages of both the waveguide transmission loss and the power capacity, can convert a TE10 mode in a waveguide transmission line into a TEM mode in the coaxial transmission line through waveguide coaxial transition and is a bridge for connecting a waveguide circuit and the coaxial circuit. In addition, the sleeve is added on the probe, the advantages of low insertion loss and large working bandwidth are achieved, the coaxial probe transition mode is adopted, the position and the size of the coaxial probe are optimized, and the requirements of low loss, wide frequency band and small standing wave can be met. The coaxial body adopts the insulator of special design, also can solve the problem that traditional transition mode is not sealed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is an exploded view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

the notation in the figure is: 1. J.2.92-KFDB3 linker; 2. a coaxial inner conductor; 3. an insulator; 4. an air chamber; 5. a coaxial probe; 6. a waveguide.

Detailed Description

In order to better understand the purpose, structure and function of the present invention, a millimeter wave coaxial-waveguide transition structure of the present invention is described in further detail below with reference to the accompanying drawings.

Example 1:

referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a coaxial-waveguide transition structure of millimeter wave, includes that J.2.92-KFDB3 connects 1, coaxial inner conductor 2, insulator 3, air chamber 4, coaxial probe 5,

waveguide

6, 6 tops of waveguide are equipped with the broadside opening, coaxial probe 5 sets up inside waveguide 6, coaxial inner conductor 2 one side is from last to passing insulator 3, air chamber 4, broadside opening and coaxial probe 5 fixed connection down in proper order, 2 opposite sides of coaxial inner conductor and J.2.92-KFDB3 connect 1 fixed connection.

Further, the waveguide 6 employs a standard BJ320 waveguide.

Further, the insulator 3 is a standard 290-06G insulator.

Further, the coaxial probe 5 is provided with a sleeve for reducing the insertion loss of the coaxial probe 5.

Further, the waveguide 6 is provided with a short-circuit piston for ensuring that the coaxial probe 5 is at maximum voltage within the waveguide 6.

The working principle is as follows: the utility model is based on the microwave basic theory, the method is that the coaxial probe 5 is inserted into the waveguide 6 cavity through the waveguide 6 broadside central opening, the electric field in the waveguide 6 is coupled to the coaxial line through a section of coaxial probe 5 which plays a role of coupling probe, and the short circuit piston in the waveguide 6 ensures that the coaxial probe 5 is in the maximum voltage in the waveguide 6, namely the position with the strongest electric field. The specific principle is as follows: the coaxial probe 5 is inserted into the cavity of the waveguide 6, the coaxial probe 5 acts as a small antenna in the waveguide 6, and if the coaxial line is connected to a wave source, the coaxial probe 5 acts as a small transmitting antenna which radiates electromagnetic waves defined by the waveguide 6, and the mode is excited as long as the electric field of the electromagnetic waves is consistent with the electric field or magnetic field component of a mode of the waveguide 6. In order to excite the mode, the coaxial probe 5 is inserted from the center of the broad side of the waveguide 6, and the coaxial probe 5 is the best position for exciting the TE10 mode at the center of the broad side of the waveguide 6, so that the transformation of the TEM mode of the coaxial line to the TE10 mode of the waveguide can be realized. The electric field of the electromagnetic wave thus radiated is mainly directed to the parallel probe, and the TE10 mode is excited effectively. The coaxial-waveguide transition is made more efficient by optimizing the position and size of the coaxial body within the waveguide 6, the specific dimensions being shown in tables 1 and 2. The air cavity transition is introduced in the design, the index requirement can be met, the signal transmission is obviously improved in the millimeter wave frequency band, in addition, the coaxial waveguide transition is connected with the J.2.92-KFDB3 joint 1, and the joint 1 can be connected with other devices through the J.2.92-KFDB3, so that the coaxial waveguide transition can be applied to practical experiments.

TABLE 1 coaxial Probe size recommendation parameters (coaxial Probe radius R, unit: mm)

R1	R2	R3
			0.15	0.5	0.98

TABLE 2 coaxial-waveguide transition size recommendation parameters (units: mm)

h1	h2	h3	h4
				1.4	2.15	1.5	2.84

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims

1. A millimeter wave coaxial-waveguide transition structure is characterized in that: including J.2.92-KFDB3 joint (1), coaxial inner conductor (2), insulator (3), air chamber (4), coaxial probe (5), waveguide (6) top is equipped with the broadside opening, coaxial probe (5) set up inside waveguide (6), coaxial inner conductor (2) one side is from last to passing insulator (3), air chamber (4), broadside opening and coaxial probe (5) fixed connection down in proper order, coaxial inner conductor (2) opposite side and J.2.92-KFDB3 joint (1) fixed connection.

2. The millimeter wave coaxial-waveguide transition structure of claim 1, wherein the waveguide (6) is a standard BJ320 waveguide.

3. The millimeter wave coaxial-waveguide transition structure according to claim 1, wherein the insulator (3) is a standard 290-06G insulator.

4. The millimeter wave coaxial-waveguide transition structure according to claim 1, wherein the coaxial probe (5) is provided with a sleeve for reducing insertion loss of the coaxial probe (5).

5. The millimeter wave coaxial-waveguide transition structure according to claim 1, wherein the waveguide (6) is provided with a shorting plunger for ensuring that the coaxial probe (5) is at maximum voltage within the waveguide (6).