CN113839156B - Broadband low-pass filter suitable for high-power traveling wave tube - Google Patents
Broadband low-pass filter suitable for high-power traveling wave tube Download PDFInfo
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- CN113839156B CN113839156B CN202110994114.2A CN202110994114A CN113839156B CN 113839156 B CN113839156 B CN 113839156B CN 202110994114 A CN202110994114 A CN 202110994114A CN 113839156 B CN113839156 B CN 113839156B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
Abstract
The invention discloses a broadband low-pass filter suitable for a high-power traveling wave tube, and belongs to the technical field of microwave electronics and electric vacuum. The filter comprises a main waveguide, main waveguide matching structures symmetrically arranged at two ends of the main waveguide, two rows of coupling slot arrays respectively arranged on the wide edge of the main waveguide, and a high-frequency matching structure connected with the other ends of the coupling slots. In a working frequency band, low-frequency signals and high-frequency signals enter the main waveguide through the main waveguide matching structure at the same time, and because the coupling gap can not transmit the low-frequency signals, the low-frequency signals reach the main waveguide matching structure at the other end through the main waveguide to be output, and the high-frequency signals enter the transition connecting section through the coupling gap, finally enter the high-frequency matching structure and are absorbed by a standard matching load at the tail end of the high-frequency matching structure. Thereby achieving the effect of low-pass filtering in the broadband low-pass filter.
Description
Technical Field
The invention belongs to the technical field of microwave electronics and electric vacuum, and particularly relates to a broadband low-pass filter suitable for a high-power traveling wave tube.
Background
With the increase of strategic demands of the country, the millimeter wave frequency band becomes a popular choice in the fields of next-generation communication and military. The electric vacuum device has great research significance in a millimeter wave frequency band due to the characteristics of excellent reliability and high power capacity. The traveling wave tube is one kind of electric vacuum device, and is especially suitable for electronic countermeasure, satellite or airborne communication, radar and other fields because of its wide frequency band and small size incomparable to other devices. The latest research is focused on that the ribbon beam traveling wave tube has larger current and power capacity compared with the traditional cylindrical electron beam. Therefore, countries around the world strive to develop high-power and high-gain traveling-wave tubes to meet the requirements of scientific research fields.
If the oscillation signal is not processed, the output characteristic and the working performance of the traveling wave tube are seriously influenced. The traditional filtering structure of the waveguide system generally filters the oscillation signal by adding a resonant cavity, but the frequency band of the resonant cavity filter is often a narrow band or a spot frequency. Therefore, the traditional filtering structure cannot deal with the oscillation problem of the traveling wave tube.
Disclosure of Invention
The invention aims to provide a broadband low-pass filter suitable for a high-power traveling wave tube, so that the broadband low-pass filter can transmit low-frequency signals and absorb high-frequency signals in a 10-20GHz working frequency band.
The technical scheme of the invention is as follows:
the broadband low-pass filter is characterized by comprising a main waveguide, main waveguide matching structures symmetrically arranged at two ends of the main waveguide, two rows of coupling slot arrays respectively arranged on the wide side of the main waveguide, and a high-frequency matching structure.
The main waveguide is a rectangular waveguide, and the width dimension of the main waveguide is as follows: narrow side size =2:1, the size of the wide side is in the range of 1-2 lambda 1 ，λ 1 The wavelength of the highest operating frequency.
The main waveguide matching structure is used for matching and transferring the standard rectangular waveguide to the main waveguide.
The row of coupling gap arrays comprises 5-10 periodically arranged coupling gaps; the two rows of coupling slot arrays are arranged in a staggered mode by a half period along the axis direction.
The coupling gap is a stepped coupling gap with gradually changed width sides, and the other end of the coupling gap is connected with the high-frequency matching structure through a transition connecting section.
The high-frequency matching structure is a stepped waveguide structure formed by multiple sections of rectangular waveguides with gradually changed sizes, and the tail end of the stepped waveguide structure is loaded with a standard matching load.
Further, the broadside dimension of the transition connecting section is as follows: narrow side size =1:0.1-0.3, and the size of the wide side ranges from 0.4 to 0.6 lambda 2 ，λ 2 Is the wavelength of the lowest frequency of the high frequency band.
Furthermore, the main waveguide matching structure is a stepped waveguide structure formed by multiple sections of rectangular waveguides with gradually changed sizes.
Furthermore, the transition connecting section is a straight transition connecting section or a bending transition connecting section, and the straight transition connecting section and the bending transition connecting section are arranged in a periodic staggered mode.
Furthermore, the transition connecting section is a straight transition connecting section, or a left-side bent transition connecting section, or a right-side bent transition connecting section, and the three transition connecting sections are arranged in a periodically staggered manner.
Further, the bending angle outside corner cutting operation of the bending transition connecting section.
In the working frequency band, the low-frequency signal and the high-frequency signal enter the main waveguide through the main waveguide matching structure simultaneously. Because the coupling gap can not transmit low-frequency signals, the low-frequency signals reach the main waveguide matching structure at the other end through the main waveguide to be output, and the high-frequency signals enter the transition connecting section through the coupling gap, finally enter the high-frequency matching structure and are absorbed by the standard matching load at the tail end of the high-frequency matching structure. Thereby achieving the effect of low-pass filtering in the broadband low-pass filter.
Drawings
FIG. 1 is a schematic diagram of an overall structure of a wide band low pass filter according to an embodiment;
FIG. 2 is a front view of a wideband low pass filter of an embodiment;
FIG. 3 is a side view of a broadband low pass filter of an embodiment;
FIG. 4 is a diagram of a coupling slot and a high frequency structure branch of the broadband low pass filter according to the embodiment;
fig. 5 is a graph of performance parameters for this example.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
The embodiment provides a broadband low-pass filter suitable for a Ka-band strip-shaped traveling wave tube.
Referring to fig. 1, the filter includes a main waveguide (1), main waveguide matching structures (2) symmetrically disposed at two ends of the main waveguide, two rows of coupling slot arrays (3) respectively disposed at wide sides of the main waveguide, a transition connection section (4), a high-frequency matching structure (5), and a Ka standard matching load (6).
The total filter length lg =105mm.
The main waveguide is a rectangular waveguide, the size of the wide side of the main waveguide is 8mm, and the size of the narrow side of the main waveguide is 4mm.
The main waveguide matching structure is used for matching and transitioning the standard rectangular waveguide to the main waveguide (1). The main waveguide matching structure (2) is divided into three sections (2-1, 2-2 and 2-3), the wide sides of the main waveguide matching structure are 7.112mm, 7.3mm and 7.6mm in sequence, the narrow sides of the main waveguide matching structure are 3.556mm, 3.65mm and 3.8mm in sequence, and the lengths of the main waveguide matching structure are d1=3mm, d2=3.3mm and d3=3mm in sequence.
The row of coupling slit arrays comprises 8 periodically arranged coupling slits (3); two rows of coupling slot arrays are staggered by half a period along the axial direction, and the length of one period d =6.8mm.
The coupling gap is notch cuttype coupling gap (3) of broadside gradual change, and its narrow limit is 0.6mm, and three-section ladder width is w4=8mm, w5=6.8mm, w6=4.4mm respectively, highly is d4=3mm, d5=1.4mm, d6=5.6mm respectively, and the other end of coupling gap passes through the transitional coupling section and connects the high frequency matching structure.
The transitional coupling section comprises a right-side bending transitional coupling section (4-1), a left-side bending transitional coupling section (4-2) and a straight transitional coupling section (4-3), the three transitional coupling sections are periodically arranged in a staggered mode, the wide side size of the transitional coupling section (4) is 4.4mm, the narrow side size of the transitional coupling section is 0.6mm, the turning angle of the bending transitional coupling section is 90 degrees, and the outside corner cut operation is performed. The purpose of arranging the bending transition connecting section is to facilitate the connection of a Ka standard matching load (6) with a rear-stage device.
The high-frequency matching structure (5) is a step type waveguide structure consisting of 4 sections of rectangular waveguides with gradually changed sizes, and the tail end of the high-frequency matching structure is loaded with a Ka standard matching load (6). The stepped waveguide structure is divided into four sections of 5-1, 5-2, 5-3 and 5-4, the wide sides of the stepped waveguide structure are sequentially 4.43mm, 5.34mm, 6.65mm and 7.112mm, the narrow sides are sequentially 0.72mm, 1.64mm, 3mm and 3.556mm, and the lengths of the stepped waveguide structure are sequentially 3.57mm, 2.63mm, 2.68mm and 13mm.
The working frequency band of the filter of the embodiment is 26GHz-40GHz and the filter works in TE 10 Mode(s). FIG. 5 is a graph of performance parameters for this example, S11 is the reflection coefficient of the filter, and S11 is less than-20 dB in both 26-40 GHz; s21 is the transmission coefficient of the filter, S21 is greater than-0.1 dB in 26-33GHz and less than-10 dB in 35-39 GHz; the invention can realize low-frequency transmission and high-frequency absorption in the working frequency band, and simultaneously keep the reflection less than-20 dB in the full frequency band.
The above examples are only for convenience of explaining the present invention, and the broadband low-pass filter suitable for the high-power traveling wave tube provided by the present invention can be used for ribbon traveling wave tubes of different frequency bands. The invention belongs to the protection scope by changing various parameters mentioned in the scheme of the invention and using the structure of the invention.
Claims (6)
1. A broadband low-pass filter suitable for a high-power traveling wave tube is characterized by comprising a main waveguide, main waveguide matching structures symmetrically arranged at two ends of the main waveguide, two rows of coupling slot arrays respectively arranged at the wide edge of the main waveguide, and a high-frequency matching structure;
the main waveguide is a rectangular waveguide, the size of the wide side and the size of the narrow side of the main waveguide are both larger than the size of a standard rectangular waveguide connected with the main waveguide, and the size of the wide side of the main waveguide is as follows: narrow side size =2:1;
the main waveguide matching structure is a stepped waveguide structure consisting of a plurality of sections of rectangular waveguides with the width and the narrow sides reduced simultaneously and is used for matching and transferring the standard rectangular waveguide to the main waveguide;
the row of coupling slot arrays comprises 5-10 coupling slots which are arranged periodically; the two rows of coupling slot arrays are arranged in a staggered manner for a half period along the axis direction;
the coupling slot is a step-type coupling slot with gradually changed broadsides, and the broadside size of the connection part of the coupling slot and the main waveguide is the same as that of the main waveguide; the other end of the coupling gap is connected with the high-frequency matching structure through a transition connecting section;
the high-frequency matching structure is a stepped waveguide structure formed by multiple sections of rectangular waveguides with gradually changed sizes, and the tail end of the stepped waveguide structure is loaded with a standard matching load.
2. The broadband low-pass filter for high-power traveling-wave tubes according to claim 1, wherein the main waveguide wide side has a dimension in a range of 1-2 λ 1 ，λ 1 The wavelength of the highest operating frequency.
3. The broadband low-pass filter for high-power traveling-wave tubes according to claim 1, wherein the width dimension of the transition connection section is: narrow side size =1:0.1-0.3, and the size of the wide edge ranges from 0.4 to 0.6 lambda 2 ，λ 2 The wavelength of the lowest frequency of the high frequency band.
4. The broadband low-pass filter applicable to high-power traveling-wave tubes according to claim 1, wherein the transition connection section is a straight transition connection section or a bent transition connection section, and the straight transition connection section and the bent transition connection section are periodically arranged in a staggered manner.
5. The broadband low-pass filter applicable to high-power traveling-wave tubes according to claim 1, wherein the transition connection section is a straight transition connection section, a left-side bent transition connection section, or a right-side bent transition connection section, and the three transition connection sections are arranged in a periodically staggered manner.
6. A broadband low pass filter for high power traveling wave tubes according to claim 4 or 5, wherein the bend transition section is operated with a corner outer chamfer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110994114.2A CN113839156B (en) | 2021-08-27 | 2021-08-27 | Broadband low-pass filter suitable for high-power traveling wave tube |
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| CN202110994114.2A CN113839156B (en) | 2021-08-27 | 2021-08-27 | Broadband low-pass filter suitable for high-power traveling wave tube |
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| CN113839156A CN113839156A (en) | 2021-12-24 |
| CN113839156B true CN113839156B (en) | 2023-03-07 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1046277A (en) * | 1962-07-03 | 1966-10-19 | Thomson Houston Comp Francaise | Filters for the absorption of parasitic signals |
| CN104868211A (en) * | 2015-05-27 | 2015-08-26 | 中国电子科技集团公司第二十七研究所 | Tunable high power waveguide band-stop filter |
-
2021
- 2021-08-27 CN CN202110994114.2A patent/CN113839156B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1046277A (en) * | 1962-07-03 | 1966-10-19 | Thomson Houston Comp Francaise | Filters for the absorption of parasitic signals |
| CN104868211A (en) * | 2015-05-27 | 2015-08-26 | 中国电子科技集团公司第二十七研究所 | Tunable high power waveguide band-stop filter |
Non-Patent Citations (1)
| Title |
|---|
| Waveguide Stub Filters;网络证据;《https://slideplayer.com/slide/9116417/》;20160903;第2：41分播放位置内容 * |
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