阅读说明：本技术 一种紧凑型双脊波导窗 (Compact type double-ridge waveguide window ) 是由 王清源 陈少东 于 2021-08-18 设计创作，主要内容包括：本发明公布了一种紧凑型双脊波导窗的设计方案。通过采用较厚的陶瓷窗片、双脊矩形波导和矩形波导匹配传输线,本发明可以实现紧凑型超宽带高功率真空窗。本发明将主要用于高平均功率的宽带微波系统中,特别是用于超宽带通信系统中。(The invention discloses a design scheme of a compact double-ridge waveguide window. By adopting a thicker ceramic window, the double-ridge rectangular waveguide and the rectangular waveguide matching transmission line, the invention can realize the compact ultra-wideband high-power vacuum window. The invention is mainly used in high average power broadband microwave system, especially in ultra-wideband communication system.)

1. A compact double-ridge waveguide window is characterized by comprising a section of input and output transmission line (1), a section of transition transmission line (3), a section of dielectric transmission line (2), another section of transition transmission line (3) and another section of input and output transmission line (1) which are sequentially communicated; the input and output transmission line (1), the transition transmission line (3) and the dielectric transmission line (2) are communicated along the axial direction of the input and output transmission line.

2. A compact double-ridge waveguide window according to claim 1, wherein the input-output transmission line (1) is a rectangular waveguide provided with two metal ridges (11), being a double-ridge rectangular waveguide.

3. A compact double-ridge waveguide window according to claim 2, wherein the relative operating bandwidth of said compact double-ridge waveguide window is greater than 100%; the bottom frequency of the working frequency band of the compact double-ridge waveguide window is f₁High end frequency of f₂The relative operating bandwidth is defined as 2 x (f)₂-f₁)/(f₂+f₁)。

4. A compact double-ridge waveguide window according to claim 2, characterized in that said dielectric transmission line (2) is a dielectric-filled rectangular waveguide.

5. A compact double-ridge waveguide window according to claim 4, characterized in that said transition transmission line (3) is a rectangular waveguide.

6. A compact double-ridge waveguide window according to claim 5, characterized in that the width of the transition transmission line (3) is smaller than the width of the dielectric transmission line (2).

7. A compact double-ridge waveguide window according to claims 5 and 6, characterized in that the height of the transition transmission line (3) is smaller than the height of the dielectric transmission line (2).

8. A compact double-ridge waveguide window according to claim 4, characterized in that the filling medium of the dielectric transmission line (2) is ceramic with a purity higher than 95%.

9. A compact double-ridge waveguide window according to claim 4, characterized in that the thickness of the dielectric transmission line (2) is more than 1.5% of the free-space wavelength corresponding to the center frequency of the compact double-ridge waveguide window.

10. The compact dual-ridge waveguide window of claim 1, wherein the length of the compact dual-ridge waveguide window is less than 10% of the free-space wavelength corresponding to the center frequency of the compact dual-ridge waveguide window.

Technical Field

The invention relates to a microwave device. In particular to a compact ultra-wideband double-ridge waveguide window.

Background

Waveguide vacuum windows are one of the commonly used microwave devices. Vacuum windows are required at the input and output of various electric vacuum microwave sources. The vacuum window has two functions. First, the atmosphere can be isolated and a high vacuum maintained in an electrovacuum microwave source. Second, the microwaves can pass through the vacuum window with little reflection and loss. The traditional waveguide vacuum window is mainly a box-type vacuum window, the input and output transmission line is a coaxial line, a rectangular waveguide or a double-ridge waveguide, and the window sheet is in a circular shape or a double-ridge shape. The main drawback of the conventional waveguide vacuum window is its relatively narrow operating bandwidth. The existing double-ridge waveguide vacuum window adopts a double-ridge window sheet, and the processing cost is higher. Meanwhile, the structure is complex, the window sheet is thin, and the window sheet is easy to damage.

Disclosure of Invention

It is an object of the present invention to provide a compact double-ridge waveguide window. In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a compact double-ridge waveguide window comprises a section of input and output transmission line, a section of transition transmission line, a section of dielectric transmission line, another section of transition transmission line and another section of input and output transmission line which are sequentially communicated. The input and output transmission line, the transition transmission line and the medium transmission line are communicated along the axial direction of the input and output transmission line.

In order to expand the working bandwidth of the compact double-ridge waveguide window, the input and output transmission line is a rectangular waveguide provided with two metal ridges and is a double-ridge rectangular waveguide.

The relative working bandwidth of the compact double-ridge waveguide window is more than 100 percent; the bottom frequency of the working frequency band of the compact double-ridge waveguide window is f₁High end frequency of f₂The relative operating bandwidth is defined as 2 ×

(f₂-f₁)/(f₂+f₁)。

In order to simplify the structure of the compact double-ridge waveguide window, the dielectric transmission line is a rectangular waveguide filled with a medium. The shape of the window is simple and is a common rectangle.

In order to further simplify the structure of the compact double-ridge waveguide window, the transition transmission line is also a rectangular waveguide.

In order to facilitate the processing of the metal part of the compact double-ridge waveguide window and the welding and sealing with the window sheet, the width of the transition transmission line is smaller than that of the medium transmission line.

In order to further facilitate the processing of the compact double-ridge waveguide window, the height of the transition transmission line is smaller than the height of the dielectric transmission line.

In order to obtain higher strength and higher power capacity, the filling medium of the dielectric transmission line is preferably ceramic, and the purity of the filling medium is higher than 95%, because the high-purity ceramic has enough strength and lower loss and is lower in cost.

In order to ensure that the compact double-ridge waveguide window has higher strength, the thickness of the dielectric transmission line is more than 1.5% of the free space wavelength corresponding to the central frequency of the compact double-ridge waveguide window.

In order to minimize the length of the compact double-ridge waveguide window, the length of the compact double-ridge waveguide window is set to be less than 10% of the free space wavelength corresponding to the center frequency of the compact double-ridge waveguide window.

The invention discloses a design scheme of a compact double-ridge waveguide window, which realizes a compact ultra-wideband high-power vacuum window by adopting a thicker rectangular ceramic window piece, a double-ridge rectangular waveguide and a rectangular waveguide matching transmission line. The invention is mainly used in high average power broadband microwave system, especially in ultra-wideband communication system.

Drawings

FIG. 1 is a schematic top view of example 1 of the present invention

FIG. 2 is a schematic view of FIG. 1 taken along the axial direction

FIG. 3 is a calculated reflectance curve for example 1

The reference numbers in the drawings correspond to the names: 1-input/output transmission line, 11-metal ridge, 2-dielectric transmission line and 3-transition transmission line.

Detailed Description

Example 1

As shown in figures 1 to 3.

A compact double-ridge waveguide window comprises a section of input and output transmission line 1, a section of transition transmission line 3, a section of dielectric transmission line 2, another section of transition transmission line 3 and another section of input and output transmission line 1 which are sequentially communicated. The input and output transmission line 1, the transition transmission line 3 and the dielectric transmission line 2 are communicated along the axial direction.

The input and output transmission line 1 is a rectangular waveguide provided with two metal ridges 11, and is a double-ridge rectangular waveguide. The long side of the rectangular waveguide cross section is 18.29mm, the height is 8.15mm, the width of the metal ridge is 4.39mm, and the gap between the top ends of the two metal ridges is 2.57 mm.

The bottom frequency of the working frequency band of the compact double-ridge waveguide window is 6GHz, the high-end frequency of the working frequency band of the compact double-ridge waveguide window is 18GHz, and the relative working bandwidth of the compact double-ridge waveguide window is more than 100%;

the dielectric transmission line 2 is a rectangular waveguide filled with a dielectric, and the long side of the cross section of the rectangular waveguide is 16.88mm, the height of the rectangular waveguide is 6.98mm, and the thickness of the rectangular waveguide is 0.38 mm. The dielectric material is ceramic with a purity of 95% or more and a dielectric constant of 9.6.

The transition transmission line 3 is also a rectangular waveguide, and the long side of the cross section of the transition transmission line is 16.47mm, the height of the transition transmission line is 6.17mm, and the thickness of the transition transmission line is 0.5 mm.

The width of the transition transmission line 3 is smaller than that of the dielectric transmission line 2.

The height of the transition transmission line 3 is less than that of the dielectric transmission line 2.

The thickness of the dielectric transmission line 2 is more than 1.5% of the free space wavelength corresponding to the central frequency of the compact double-ridge waveguide window.

The length of the compact double-ridge waveguide window is less than 5.6% of the free space wavelength corresponding to the central frequency of the compact double-ridge waveguide window.

As can be seen from FIG. 3, the embodiment can achieve good matching in the ultra-wideband microwave frequency band of 6-18 GHz. The reflected standing wave ratio of the present embodiment is below 1.1 throughout the operating bandwidth.

An embodiment of the present invention is given above. The actual implementation is far more extensive than listed here. The metal part of the compact double-ridge waveguide window is generally processed by a milling machine.

The compact double-ridge waveguide window disclosed by the invention realizes the compact ultra-wideband high-power vacuum window by adopting a thicker ceramic window sheet, a double-ridge rectangular waveguide and a rectangular waveguide matching transmission line. The invention is mainly used in high average power broadband microwave system, especially in ultra-wideband communication system.