CN106992337A - A kind of Ka wave bands circular waveguide TE01 mode exciters - Google Patents

Abstract

The present invention discloses a kind of Ka wave bands circular waveguide TE01 mode exciters, is made up of orthogonal waveguide, rectangular step waveguide, uniform square wave guide, bone shape step waveguide and uniform circular waveguide.The input port of a port rock mechanism driver of orthogonal waveguide；The another port of the orthogonal waveguide port less than normal with the size of rectangular step waveguide is connected, and the port that the size of rectangular step waveguide is bigger than normal is connected with a port of uniform square wave guide；The port that another port of uniform square wave guide is less than normal with the size of bone shape step waveguide is connected, and the port that the size of bone shape step waveguide is bigger than normal is connected with a port of uniform circular waveguide, the output port of another port rock mechanism driver of uniform circular waveguide.The present invention has high conversion efficiency, height mode purity, compact conformation, easy to process and wide band feature.

Description

A Ka-band circular waveguide TE01 mode exciter

technical field

The invention relates to the technical field of mode exciters, in particular to a Ka-band circular waveguide TE01 mode exciter.

Background technique

According to the circular waveguide TE01 mode ( Mode) field structure distribution, it can be seen that it has the following characteristics: (1) It is an axisymmetric mode, and there is no polarization degenerate mode; (2) The transmission loss is low, and as the frequency increases, the loss decreases instead; (3) With less number of mode competitions, the mode conversion process can be simplified. Due to the above characteristics, Modes are widely used in high power microwave devices. in, The mode is regarded as the working mode of the partial gyrotron. Since the working mode output by the gyrotron cavity cannot be used directly, it is impossible to cold test the performance of the system, such as the Q value and frequency of the resonant cavity, and the test of the transmission and reflection characteristics of the input window and output window, etc., so it is often necessary A specific mode exciter is used to simulate the working mode of the gyrotron so that the high frequency system can be tested. Nowadays, various specific mode exciters have been extensively studied at home and abroad.

When the mode exciter is tested experimentally, high mode conversion efficiency, high mode purity, compact structure, easy processing and wide frequency band are required. Currently, Mode exciters include sector mode exciters, sidewall coupled mode exciters, cross mode exciters and H-plane bending mode exciters, etc. In "Journal of Infrared, Millimeter, and TerahertzWaves", 2005, Vol. 26, No. 19, pp. 1407-1415", the fan-shaped mode exciter has a low conversion efficiency, many miscellaneous modes, and a complex structure. , is difficult to realize, and is generally produced by electroforming, and the production cost is also high. Although the sidewall coupled mode exciter published in "Popular Science and Technology, 2013, Vol. 15, No. 162, pp. 1-3" has good compact structure, high conversion efficiency and wide frequency bandwidth, due to the application of power Sub-networks require a high level of craftsmanship. The cross mode exciter published in "Journal of Vacuum Science and Technology, 2013, Volume 33, Issue 4, Pages 309-314" is a TE ₀₁ that gradually transforms the TE ₁₀ mode in the rectangular waveguide into a circular waveguide Although the working frequency is wide, the conversion efficiency is high, and the output mode is of high purity, the model is relatively large and processed by electroplating, so the cost is expensive. The H-surface bending mode exciter mentioned in "Intense Lasers and Particle Beams", 2014, Vol. 26, No. 6, pp. 114-118", the purity of the mode exciter is above 98% and the conversion efficiency The relative bandwidth of more than 95% can reach 4.2GHz. This structure has the advantages of good compactness, high conversion efficiency and purity, and wide frequency band. , a circular waveguide wave pattern will be split into two wave patterns, so for elliptical waveguide processing, higher precision is required.

Contents of the invention

for existing The mode exciter cannot meet the requirements of high conversion efficiency and easy processing at the same time, and a Ka-band circular waveguide TE01 mode exciter is provided.

In order to solve the above problems, the present invention is achieved through the following technical solutions:

A Ka-band circular waveguide TE01 mode exciter, the mode exciter is composed of the following five parts:

The first part, the orthogonal waveguide, is composed of two rectangular waveguides; these two rectangular waveguides include a standard rectangular waveguide and an overmodulated rectangular waveguide; one port of the overmodulated rectangular waveguide is opened on its wide side, The other port is opened on its rear end face; the standard rectangular waveguide is vertically set on the side width surface of the overmodulated rectangular waveguide, and one port of the standard rectangular waveguide is connected to the port on the side wide surface of the overmodulated rectangular waveguide;

The second part, the rectangular stepped waveguide, is composed of 4 rectangular waveguides; these 4 rectangular waveguides are standard rectangular waveguides that pass through front and back; the size of these 4 rectangular waveguides changes gradually, and the ports are connected end to end to form a ladder shape;

The third part, the uniform square waveguide, is composed of a rectangular waveguide; the rectangular waveguide is a standard rectangular waveguide that runs through the front and back;

The fourth part, the bone-shaped stepped waveguide, is composed of 9 bone-shaped waveguides; the 9 bone-shaped waveguides run through from front to back; the size of the 9 bone-shaped waveguides changes gradually, and the ports are connected end to end to form a ladder shape;

The fifth part, the uniform circular waveguide, is composed of a circular waveguide; the circular waveguide is a standard circular waveguide that runs through the front and back; the circular waveguide has built-in pins;

One port of the orthogonal waveguide forms the input port of the mode exciter; the other port of the orthogonal waveguide is connected to the undersized port of the rectangular stepped waveguide, and the oversized port of the rectangular stepped waveguide is connected to one port of the uniform square waveguide ; The other port of the uniform square waveguide is connected to the smaller port of the bone-shaped stepped waveguide, the larger port of the bone-shaped stepped waveguide is connected to one port of the uniform circular waveguide, and the other port of the uniform circular waveguide forms a mode excitation the output port of the device.

In the above solution, the other port of the standard rectangular waveguide of the orthogonal waveguide forms the input port of the mode exciter, and the other port of the overmodulated rectangular waveguide is connected to the smaller port of the rectangular stepped waveguide.

In the above solution, the front end of the overmodulated rectangular waveguide of the orthogonal waveguide is closed and chamfered with the narrow side.

In the above solution, the central axis of the standard rectangular waveguide of the orthogonal waveguide intersects the central axis of the overmodulated rectangular waveguide.

In the above scheme, the four corners of the sides of the four rectangular waveguides of the rectangular stepped waveguide are chamfered.

In the above solution, the lengths of the four rectangular waveguides of the rectangular stepped waveguide are all 1/4 wavelength.

In the above solution, the four corners of the side surfaces of the rectangular waveguide of the uniform square waveguide are chamfered.

In the above scheme, the lengths of the nine bone-shaped waveguides of the bone-shaped stepped waveguide are all 1/4 wavelength.

In the above scheme, the circular waveguide of the uniform circular waveguide has 4 pins built in; one end of these 4 pins is inlaid on the inner wall of the uniform circular waveguide, and the other end points to the central axis of the circular waveguide; these 4 pins are about the circular waveguide The central axis is centrally symmetrical.

In the above scheme, all four pins deviate from the plane of symmetry by 45 degrees.

Compared with the prior art, the invention has the characteristics of high conversion efficiency, high mode purity, compact structure, easy processing and wide frequency band.

Description of drawings

Fig. 1 is a perspective cutaway schematic diagram of a Ka-band circular waveguide TE01 mode exciter.

Figure 2 is a simplified schematic diagram of a waveguide.

Fig. 3 is a schematic diagram of an explosion of a waveguide.

Fig. 4 is a cross-sectional view of a bone waveguide.

Fig. 5 is a conversion efficiency diagram of a Ka-band circular waveguide TE01 mode exciter.

Fig. 6 is a mode purity diagram of a Ka-band circular waveguide TE01 mode exciter.

Fig. 7 is a return loss diagram of a Ka-band circular waveguide TE01 mode exciter.

detailed description

A Ka-band circular waveguide TE01 mode exciter, as shown in Figure 1-3, the mode exciter consists of five parts: the first part is the orthogonal waveguide, the second part is the rectangular stepped waveguide, and the third part is the uniform square waveguide. The waveguide, the fourth part is the bone-shaped stepped waveguide and the fifth part is the uniform circular waveguide.

The first part, the orthogonal waveguide, consists of two rectangular waveguides. The two rectangular waveguides include a standard rectangular waveguide that runs through front and back and an overmodulated rectangular waveguide 1-2. One port of the overmoded rectangular waveguide 1-2 is opened on its side wide surface, and the other port is opened on its rear end surface. The standard rectangular waveguide is vertically arranged on the wide side of the overmodulated rectangular waveguide 1-2, and the central axis of the standard rectangular waveguide of the orthogonal waveguide intersects the central axis of the overmodulated rectangular waveguide 1-2. One port of the standard rectangular waveguide is connected to the port on the side width of the overmodulated rectangular waveguide 1-2. The other port of the standard rectangular waveguide forms one port of the orthogonal waveguide, and the other port of the overmodulated rectangular waveguide 1-2 forms the other port of the orthogonal waveguide. The front end face of the overmoded rectangular waveguide 1-2 of the orthogonal waveguide is closed, and forms a chamfer with the narrow side face. To ensure compactness, the length of the overmolding rectangle is 1-2 wavelengths.

The second part, that is, the rectangular ladder waveguide is composed of four rectangular waveguides 2-1 to 2-4. The four rectangular waveguides 2-1 to 2-4 are all standard rectangular waveguides that pass through front and back, and the four corners of the sides of the four rectangular waveguides 2-1 to 2-4 are chamfered. The dimensions of the four rectangular waveguides 2-1 to 2-4 change gradually, and the ports are connected end to end to form a ladder shape. Each of the four rectangular stepped waveguides 2-1 to 2-4 has a length of 1/4 wavelength, so that on the one hand impedance matching can be achieved, on the other hand the difficulty of processing can be reduced and the structure can be compacted.

The third part, that is, the uniform square waveguide is composed of a rectangular waveguide 3-1. The rectangular waveguide 3-1 is a standard rectangular waveguide that runs through the front and back, and the four corners of the sides of the rectangular waveguide 3-1 are chamfered. To ensure compactness, the length of the rectangular waveguide 3-1 is 1-2 wavelengths.

The fourth part, the bone-shaped stepped waveguide, is composed of nine bone-shaped waveguides 4-1-4-9. The nine bone-shaped waveguides 4-1 to 4-9 run through front and back. The dimensions of the nine bone-shaped waveguides 4-1 to 4-9 gradually change, and the ports are connected end to end to form a ladder shape. The length of each segment of the nine bone-shaped waveguides 4-1 to 4-9 is 1/4 wavelength, so that on the one hand, impedance matching can be achieved, and on the other hand, the difficulty of processing can be reduced and the structure can be compacted. Fig. 4 is a cross-sectional view of each bone-shaped waveguide 4-1 to 4-9, wherein a4 is the distance between the peaks of the bone-shaped waveguide, b4 is the distance between the valleys of the bone-shaped waveguide, and r4 is the radius of the chamfer.

The fifth part, the uniform circular waveguide, is composed of one circular waveguide 5-1. The circular waveguide 5-1 is a standard circular waveguide 5-1 that runs through front and back. To ensure compactness, the length of the circular waveguide 5-1 is 1-2 wavelengths. Four pins 5-2 are built in the circular waveguide 5-1. One end of these four pins 5-2 is inlaid on the inner wall of the uniform circular waveguide, and the other end points to the central axis of the circular waveguide 5-1; the four pins 5-2 are centered with respect to the central axis of the circular waveguide 5-1 It is arranged symmetrically, and the four pins 5-2 all deviate from the symmetrical plane by 45 degrees. The length of the pin 5-2 is 54.6% of the inner radius of the circular waveguide 5-1.

One port of the orthogonal waveguide, ie the other port of the standard rectangular waveguide 1-1, forms the input port of the mode exciter. The other port of the orthogonal waveguide, that is, the other port of the overmoded rectangular waveguide 1-2 is connected to the smaller port of the rectangular stepped waveguide, and the larger port of the rectangular stepped waveguide is connected to one port of the uniform square waveguide. The other port of the uniform square waveguide is connected to the smaller port of the bone-shaped stepped waveguide, the larger port of the bone-shaped stepped waveguide is connected to one port of the uniform circular waveguide, and the other port of the uniform circular waveguide forms a mode exciter output port.

The mode conversion process of the mode exciter is in The process is completed by the first part, namely the orthogonal waveguide, when When transmitting from the standard waveguide port to the connection of the overmode waveguide, the symmetrical overmode waveguide is equivalent to an electric wall, which can promote Incentives also inhibit propagation, and the mode purity is very high. By adjusting the size of the wide side and narrow side of the over-mode waveguide, the conversion performance can be optimized; chamfering the two corners at one end of the over-mode waveguide can reduce the return loss. in The process is completed in the fourth part, that is, the bone-shaped stepped waveguide. This part uses Model and The structure designed by the power line distribution characteristics of the mode guides the Die gradually becomes mode, the bone-shaped waveguide can be optimized by using simulation software to realize High conversion. in motivating out At the same time, there will be a small number of complex models Generation, in order to improve the purity of the output mode, it is important to suppress the output of the miscellaneous mode, and the purpose of the built-in 4 arrangement rule pins 5-2 in the fifth part is exactly this. according to The distribution characteristics of the power lines and the boundary conditions of the power lines, in The formation of the mode can be avoided by inserting the pin 5-2 or the blocking piece in a place where the power lines are densely distributed, thereby inhibiting the transmission of the mode.

Figures 5-7 are the conversion efficiency, mode purity and return loss diagrams of the mode exciter, respectively. As can be seen from Figure 5, the structure consists of Excited by the model The mode conversion efficiency is greater than 96% within 31.75-37.28GHz, and the bandwidth reaches 5.53GHz. It can be seen from Figure 6 that the output The mode purity is greater than 98% within 31.91-37.19GHz, and the bandwidth reaches 5.28GHz. It can be seen from Figure 7 that when the main miscellaneous mode of the output mode is , the return loss is less than -15dB within 31.63-37.57GHz.

The invention provides a compact structure that can not only meet the requirements of high conversion efficiency and high mode purity, but also meet a certain frequency bandwidth and be easy to process. mode stimulator.

Claims (10)

1. A Ka wave band circular waveguide TE01 mode exciter, it is characterized in that, this mode exciter is made up of following 5 parts: The first part, the orthogonal waveguide, is composed of two rectangular waveguides; these two rectangular waveguides include a standard rectangular waveguide (1-1) and an over-modulated rectangular waveguide (1-2); the over-modulated rectangular waveguide One port of (1-2) is opened on its wide side, and the other port is opened on its rear end face; the standard rectangular waveguide (1-1) is vertically set on the side wide surface of the overmodulated rectangular waveguide (1-2) , and one port of the standard rectangular waveguide (1-1) is connected to the port on the side wide surface of the overmodulated rectangular waveguide (1-2); The second part, the rectangular stepped waveguide, is composed of 4 rectangular waveguides (2-1~2-4); these 4 rectangular waveguides (2-1~2-4) are all standard rectangular waveguides that pass through front and back; these 4 The size of the rectangular wave (2-1～2-4) guide changes gradually, and the ports are connected end to end to form a ladder shape; The third part, the uniform square waveguide, is composed of a rectangular waveguide (3-1); the rectangular waveguide (3-1) is a standard rectangular waveguide that runs through the front and back; The fourth part, the bone-shaped stepped waveguide, is composed of 9 bone-shaped waveguides (4-1~4-9); these 9 bone-shaped waveguides (4-1~4-9) run through front and back; (4-1～4-9) The size changes gradually, and the ports are connected end to end to form a ladder shape; The fifth part, the uniform circular waveguide, is composed of a circular waveguide (5-1); the circular waveguide (5-1) is a standard circular waveguide (5-1) that runs through the -1) Built-in pins (5-2); One port of the orthogonal waveguide forms the input port of the mode exciter; the other port of the orthogonal waveguide is connected to the undersized port of the rectangular stepped waveguide, and the oversized port of the rectangular stepped waveguide is connected to one port of the uniform square waveguide ; The other port of the uniform square waveguide is connected to the smaller port of the bone-shaped stepped waveguide, the larger port of the bone-shaped stepped waveguide is connected to one port of the uniform circular waveguide, and the other port of the uniform circular waveguide forms a mode excitation the output port of the device. 2. a kind of Ka wave band circular waveguide TE01 mode exciter according to claim 1 is characterized in that, another port of the standard rectangular waveguide (1-1) of orthogonal waveguide forms the input port of mode exciter, overmode The other port of the rectangular waveguide (1-2) is connected with the smaller port of the rectangular stepped waveguide. 3. A kind of Ka-band circular waveguide TE01 mode exciter according to claim 1 or 2, it is characterized in that, the front end face of the overmodulated rectangular waveguide (1-2) of orthogonal waveguide is closed, and forms inverted with narrow side Angle (1-3). 4. a kind of Ka wave band circular waveguide TE01 mode exciter according to claim 1 and 2, is characterized in that, the central axis of the standard rectangular waveguide (1-1) of orthogonal waveguide and overmode rectangular waveguide (1-2 ) of the central axis intersect. 5. A Ka-band circular waveguide TE01 mode exciter according to claim 1, characterized in that the four corners of the sides of the four rectangular waveguides (2-1-2-4) of the rectangular stepped waveguide are all chamfered. 6. A kind of Ka-band circular waveguide TE01 mode exciter according to claim 1 or 5, characterized in that the lengths of the four rectangular waveguides (2-1～2-4) of the rectangular stepped waveguide are all 1/4 wavelength. 7. A kind of Ka-band circular waveguide TE01 mode exciter according to claim 1 is characterized in that, the four corners of the side of the rectangular waveguide (3-1) of the uniform square waveguide are all chamfered. 8. A kind of Ka-band circular waveguide TE01 mode exciter according to claim 1, is characterized in that, the length of 9 bone-shaped waveguides (4-1～4-9) of bone-shaped stepped waveguide is 1/4 wavelength. 9. A kind of Ka-band circular waveguide TE01 mode exciter according to claim 1, is characterized in that, the circular waveguide (5-1) of uniform circular waveguide is built-in 4 pins (5-2); These 4 pins One end of the pin (5-2) is inlaid on the inner wall of the uniform circular waveguide, and the other end points to the central axis of the circular waveguide (5-1); these 4 pins (5-2) are about the circular waveguide (5-1) The central axis is centrally symmetrical. 10. A Ka-band circular waveguide TE01 mode exciter according to claim 9, characterized in that the four pins (5-2) all deviate from the symmetry plane by 45 degrees.