CN106124871B - Field distribution test system and method for gyrotron traveling wave tube coupling structure - Google Patents
Field distribution test system and method for gyrotron traveling wave tube coupling structure Download PDFInfo
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- CN106124871B CN106124871B CN201610716714.1A CN201610716714A CN106124871B CN 106124871 B CN106124871 B CN 106124871B CN 201610716714 A CN201610716714 A CN 201610716714A CN 106124871 B CN106124871 B CN 106124871B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/12—Measuring electrostatic fields or voltage-potential
- G01R29/14—Measuring field distribution
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
Abstract
The invention discloses a field distribution test system and a field distribution test method for a gyrotron traveling wave tube coupling structure, which comprise the following steps: a signal source; the gyrotron traveling wave tube coupling structure, the waveguide probe, the standard WR6 waveguide and the power meter are sequentially arranged in the microwave signal transmitting direction of the signal source; the waveguide probe, the standard WR6 waveguide and the power meter are placed on the three-dimensional adjusting platform, the three-dimensional adjusting platform is adjusted to achieve adjustment of the power value, then the power value and the position information of the three-dimensional adjusting platform are processed in a one-to-one correspondence mode, and a distribution diagram of the coupling structure field of the gyrotron traveling wave tube to be measured is obtained. The method can measure the field distribution condition of the gyrotron traveling wave tube coupling structure in the frequency range of 110GHz to 170GHz, can select the coupling structure, and meets the field distribution test requirement of the gyrotron traveling wave tube coupling structure. The method is applied to the development of D-band gyrotron traveling wave tube products, has high practical application value, and lays a foundation for promoting the application of terahertz system products.
Description
Technical Field
The invention relates to the technical field of microwave electro-vacuum devices, in particular to a field distribution testing system and a field distribution testing method for a gyrotron traveling wave tube coupling structure.
Background
The gyrotron traveling wave tube is an electric vacuum device for amplifying an input microwave signal, has the characteristics of high power, wide bandwidth and high gain, and is widely applied to the fields of electronic countermeasure, radar systems and high-speed wireless communication. The high-frequency structure of the gyrotron traveling wave tube has the characteristics of an all-metal structure, less competition modes, large power capacity and the like, so that the gyrotron traveling wave tube becomes one of micro-vacuum devices with application prospects in a frequency band above 100 GHz.
The high-gain amplifier device of the gyrotron traveling wave tube has high requirements on an input-output coupling structure due to performance requirements on power and bandwidth, and hopefully realizes impedance matching, loss reduction, coupling mode purity guarantee and broadband signal coupling at the coupling structure, so that a mode of the coupling structure needs to be tested, and the mode is best characterized by testing field distribution. Generally, in a low frequency band, the size of the coupling structure is large, and the field distribution can be tested by adopting a fine probe method, but the size of the coupling structure is reduced in a terahertz frequency band above 100GHz, the influence of the probe on the field distribution cannot be ignored, and a new method needs to be considered for testing the field distribution.
The high-grade engineer of wangjiuzhen (wangjiuzhen, published by xue Zhenghui, practical manual for antenna measurement, people's post and post office, published in 2013, 1 month) of china electronic science and technology group corporation 54 well expounds the method of near-field test and the error brought by measurement, and provides a good reference for antenna design and measurement. However, the near-field test and method of the antenna are only introduced in an extensive way, the influence of the near-field measurement of the antenna on the field distribution under a close-range condition after high frequency is not considered, the field distribution measurement of the coupling structure to be tested with small size under a condition of higher mode is not considered, and the test data below 18GHz is only given in the book.
When the gyrotron traveling wave tube coupling structure with the frequency of more than 100GHz is designed, no existing field distribution test system can test the output field distribution of the coupling structure, and the application of the gyrotron traveling wave tube coupling structure with the frequency of more than 100GHz is severely restricted. Therefore, the field distribution after the coupling structure is transformed needs to be measured and judged, so that the method is applied to the processing and manufacturing of the gyrotron traveling wave tube.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a field distribution testing system for a gyrotron traveling-wave tube coupling structure, comprising:
a signal source for transmitting a microwave signal;
the gyrotron traveling wave tube coupling structure, the waveguide probe, the standard WR6 waveguide and the power meter are sequentially arranged in the microwave signal transmitting direction of the signal source;
the waveguide probe, the standard WR6 waveguide and the power meter are placed on the three-dimensional adjusting platform, the three-dimensional adjusting platform is adjusted to achieve adjustment of the power value, and then the power value and the position information of the three-dimensional adjusting platform are processed in a one-to-one correspondence mode, so that a field distribution diagram of the coupling structure of the gyrotron traveling wave tube to be measured is obtained.
Preferably, the input end of the gyrotron traveling wave tube coupling structure to be tested is connected with the microwave signal output end of the signal source; the input end of the waveguide probe is close to the output end of the coupling structure of the gyrotron traveling wave tube to be detected; the input end of the standard WR6 waveguide is connected with the output end of the waveguide probe; the input end of the test signal of the power meter is connected with the output end of the standard WR6 waveguide.
Preferably, the connection is flange connection.
Preferably, the waveguide probe is of a structure having a trapezoidal metal input end.
Preferably, the approaching distance between the trapezoidal metal input end of the waveguide probe and the output end of the coupling structure of the gyrotron traveling wave tube to be tested is 1-2 mm.
Preferably, the coupling structure of the gyrotron traveling wave tube to be tested is a mode conversion structure with an open field structure; and the open-field radiation surface of the mode conversion structure of the open-field structure is the radiation direction of the microwave signal.
Preferably, the standard WR6 waveguide has waveguide dimensions of 1.651mm by 0.826mm and a measurement frequency range of 110GHz to 170GHz.
The invention also provides a method for testing by using the field distribution testing system for the gyrotron traveling wave tube coupling structure, which comprises the following steps of:
step one, connecting an input end of a gyrotron traveling wave tube coupling structure to be tested with an output end of a signal source; horizontally placing the radiation port at the output end of the coupling structure of the gyrotron traveling wave tube to be tested;
secondly, placing the input end of the waveguide probe at a position 1-2 mm away from the output end radiation port of the coupling structure of the gyrotron traveling wave tube to be detected; connecting the flange end of the output end of the waveguide probe with the input end of a standard WR6 waveguide; the output end of the standard WR6 waveguide is connected with a probe waveguide port of the power meter;
horizontally placing the waveguide probe, the standard WR6 waveguide and the power meter probe on a three-dimensional adjusting platform;
and fourthly, after the power meter is electrified, preheated and reset, starting a signal source, moving and adjusting the three-dimensional position of the three-dimensional adjusting platform, recording the position information of the three-dimensional adjusting platform and the power value of the power meter, and describing the field distribution condition of the output radiation port of the gyrotron traveling wave tube coupling structure by utilizing the position information of the three-dimensional adjusting platform and the power value of the power meter to obtain the field distribution diagram of the gyrotron traveling wave tube coupling structure to be tested.
Preferably, the position information of the three-dimensional adjusting platform and the power value information of the power meter directly draw the field distribution of the radiation port through a graph by using MATLAB software, and directly reflect the field distribution information of the gyrotron traveling wave tube coupling structure at the position of the radiation port.
Preferably, the connection is flange connection; the coupling structure of the gyrotron traveling wave tube to be tested is a mode conversion structure with an open field structure; the open field radiation surface of the mode conversion structure of the open field structure is the radiation direction of the microwave signal; the waveguide probe is of a structure with a trapezoidal metal input end part; the waveguide size of the standard WR6 waveguide is 1.651mm multiplied by 0.826mm, and the measuring frequency range is 110 GHz-170 GHz. .
The invention at least comprises the following beneficial effects: the method can measure and obtain the field distribution condition of the gyrotron traveling wave tube coupling structure within the frequency range of 110GHz to 170GHz, can select the coupling structure, and meets the field distribution test requirement of the gyrotron traveling wave tube coupling structure. The method is finally applied to the development of D-band gyrotron traveling wave tube products, has high practical application value, and lays a foundation for promoting the application of terahertz system products.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Description of the drawings:
FIG. 1 is a schematic diagram of a field distribution test system for a gyrotron traveling wave tube coupling structure according to the present invention;
FIG. 2 is a schematic cross-sectional view of a waveguide probe according to the present invention;
fig. 3 is a schematic structural diagram of a coupling structure of a gyrotron traveling wave tube to be tested according to the present invention;
fig. 4 is a schematic position diagram of the coupling structure of the gyrotron traveling-wave tube to be tested and the waveguide probe according to the present invention.
The specific implementation mode is as follows:
the present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Fig. 1-4 illustrate a field distribution test system for a gyrotron traveling wave tube coupling structure, comprising:
a signal source 1 for transmitting a microwave signal;
the gyrotron traveling wave tube coupling structure 2, the waveguide probe 3, the standard WR6 waveguide 4 and the power meter 5 are sequentially arranged in the microwave signal transmitting direction of the signal source 1;
the method comprises the steps of placing a waveguide probe 3, a standard WR6 waveguide 4 and a power meter 5 on a three-dimensional adjusting platform 6, starting a signal source 1 after electrifying, preheating and clearing the power meter 5, moving and adjusting the three-dimensional position of the three-dimensional adjusting platform 6, recording position information of the three-dimensional adjusting platform 6 and a power value of the power meter 5, carrying out one-to-one corresponding processing on the position information of the three-dimensional adjusting platform 6 and the power value of the power meter 5, describing the field distribution condition of an output radiation port of a gyrotron traveling wave tube coupling structure 2, and obtaining a field distribution diagram of the gyrotron traveling wave tube coupling structure 2 to be measured, wherein the waveguide probe couples microwave signals radiated by the gyrotron traveling wave tube coupling structure to be measured into the standard WR6 waveguide for measuring the power value of the signals subsequently; the standard WR6 waveguide is used for connecting the waveguide probe and the power meter; the power meter is used to measure the power of the microwave signal coupled into the standard WR6 waveguide.
In the technical scheme, the input end of the coupling structure 2 of the gyrotron traveling wave tube to be tested is connected with the microwave signal output end of the signal source 1; the input end of the waveguide probe 3 is close to the output end of the coupling structure 2 of the gyrotron traveling wave tube to be detected; the output end of the waveguide probe 3 is provided with a flange end part 8, the flange end part 8 is processed by adopting a standard WR6 flange standard and is fixedly connected with the input port of a standard WR6 waveguide 4, so that the normal transmission of coupling signals is ensured, and the transmission loss is reduced; the input end of the test signal of the power meter 5 is connected with the output end of the standard WR6 waveguide 4; the standard WR6 waveguide is processed according to the standard size of international waveguide, flanges are arranged at two ends of the standard WR6 waveguide, the standard WR6 waveguide can be tightly connected with the waveguide probe 3 and the power meter 5, and the waveguide size is 1.651mm multiplied by 0.826mm.
In the technical scheme, the connections are all flange connections, so that microwave signals can pass through the flange connections without leakage.
In the above technical solution, as shown in fig. 2, the waveguide probe 3 is a probe structure having a trapezoidal metal input end portion 7; the structure can reduce the influence of the metal end surface on the distribution of the field to be measured.
In the above technical solution, the approaching distance between the trapezoidal metal input end portion 7 of the waveguide probe 3 and the output end of the gyrotron traveling-wave tube coupling structure 2 to be tested is 1-2 mm.
In the above technical solution, as shown in fig. 3 to 4, the input end 9 of the to-be-tested cyclotron traveling wave tube coupling structure 2 adopts a flange structure and a size of a standard WR6 rectangular waveguide, and is fastened and connected with a signal source in a flange manner, so as to ensure that a signal of the signal source can be transmitted to the to-be-tested coupling structure; the output end 10 of the coupling structure 2 of the gyrotron traveling wave tube to be tested directly radiates the electromagnetic field after coupling transformation into a free space; placing a waveguide probe 3, a standard WR6 waveguide 4 and a power meter 5 on a three-dimensional adjusting platform 6; placing a metal input end part 7 with a trapezoid body of the waveguide probe 3 at a position which is 1-2 mm away from an output end 10 of the field distribution coupling structure 2 to be measured in the horizontal direction; and carrying out fixed value movement adjustment on the three-dimensional adjusting platform 6 so as to measure the power value of the coupling-in distribution.
In the above technical solution, the coupling structure 2 of the gyrotron traveling wave tube to be tested is a mode conversion structure with an open-field structure; and the open-field radiation surface of the mode conversion structure of the open-field structure is the radiation direction of the microwave signal.
In the above technical solution, the waveguide size of the standard WR6 waveguide is 1.651mm × 0.826mm, and the measurement frequency range is 110GHz to 170GHz.
The invention relates to a method for testing by using a field distribution testing system for a gyrotron traveling wave tube coupling structure, which comprises the following steps of:
cleaning and drying a coupling structure 2 of a gyrotron traveling wave tube to be detected, and then fastening and connecting the coupling structure with a signal source 1 through a WR6 flange structure by using screws; horizontally placing the radiation port at the output end of the coupling structure 2 of the gyrotron traveling wave tube to be tested;
step two, connecting the output end of the waveguide probe 3 with the input end of a standard WR6 waveguide 4 by adopting a screw fastening flange; the output end of a standard WR6 waveguide 4 is connected with a probe waveguide port of a power meter 5 by adopting a screw fastening flange;
thirdly, horizontally placing the waveguide probe 3, the standard WR6 waveguide 4 and the probe of the power meter 5 on a three-dimensional adjusting platform 6; the three-dimensional adjusting platform 6 is moved to ensure that the distance between the input end of the waveguide probe 3 and the output end 10 of the coupling structure 2 of the gyrotron traveling wave tube to be detected in the horizontal direction is 1-2 mm;
and fourthly, after the power meter 5 is electrified, preheated and reset, starting a signal source, fixing the value, moving and adjusting the three-dimensional position of the three-dimensional adjusting platform 6, measuring the coupling power of the waveguide probe 3 at different positions, recording the position information of the three-dimensional adjusting platform 6 and the power value of the power meter, and drawing the field distribution condition of the output radiation port of the gyrotron traveling wave tube coupling structure by MATLAB software by utilizing the position information of the horizontal table and the power value of the power meter to obtain the field distribution diagram of the gyrotron traveling wave tube coupling structure to be tested.
In the above technical solution, the position information of the three-dimensional adjusting platform 6 and the power value information of the power meter 5 directly depict the field distribution of the radiation port through a graph by using MATLAB software, and directly reflect the field distribution information of the gyrotron traveling wave tube coupling structure at the position of the radiation port.
In the technical scheme, the connection is realized by adopting flange connection; the coupling structure of the gyrotron traveling wave tube to be tested is a mode conversion structure with an open field structure; the open field radiation surface of the mode conversion structure of the open field structure is the radiation direction of the microwave signal; the waveguide probe is of a structure with a trapezoidal metal input end part; the waveguide size of the standard WR6 waveguide is 1.651mm multiplied by 0.826mm, and the measuring frequency range is 110 GHz-170 GHz.
In the invention, an input port 9 of the gyrotron traveling wave tube coupling structure 2 to be tested is connected with an output port of a signal source by adopting a WR6 standard flange structure through screw fastening, and an output port 10 of the gyrotron traveling wave tube coupling structure 2 to be tested is horizontally arranged so as to conveniently place a waveguide probe 3.
In the invention, microwave signals are emitted from a signal source 1, form a new field distribution structure through mode conversion of a coupling structure 2 of a gyrotron traveling wave tube to be detected, and are radiated out from a port 10; then the microwave signal is coupled in through the waveguide probe 3 and enters the power meter 5 through the standard WR6 waveguide, and the power meter can directly read the power value of the coupled microwave signal at the position; by moving the position of the three-dimensional adjusting platform 6, the microwave signal power values at different positions can be obtained; and meanwhile, the position information of the three-dimensional adjusting platform 6 and the power values at different positions are recorded, and a field distribution diagram of a radiation opening can be directly drawn through MATLAB. The field distribution test of the invention can be used for measuring various gyrotron traveling wave tube coupling structures required in the design and development processes of gyrotron traveling wave tubes under other frequency conditions.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. A field distribution testing system for a gyrotron traveling wave tube coupling structure, comprising:
a signal source for transmitting a microwave signal;
the gyrotron traveling wave tube coupling structure, the waveguide probe, the standard WR6 waveguide and the power meter are sequentially arranged in the microwave signal transmitting direction of the signal source;
the method comprises the following steps of placing a waveguide probe, a standard WR6 waveguide and a power meter on a three-dimensional adjusting platform, adjusting the three-dimensional adjusting platform to realize adjustment of a power value, and further performing one-to-one corresponding processing on the power value and position information of the three-dimensional adjusting platform to obtain a distribution diagram of a coupling structure field of a gyrotron traveling wave tube to be measured;
the input end of the gyrotron traveling wave tube coupling structure to be tested is connected with the microwave signal output end of the signal source; the input end of the waveguide probe is close to the output end of the coupling structure of the gyrotron traveling wave tube to be detected; the input end of the standard WR6 waveguide is connected with the output end of the waveguide probe; the input end of a test signal of the power meter is connected with the output end of a standard WR6 waveguide;
the connection is realized by adopting flange connection;
the method for testing by using the field distribution testing system for the gyrotron traveling wave tube coupling structure comprises the following steps of:
step one, connecting an input end of a coupling structure of a gyrotron traveling wave tube to be detected with an output end of a signal source; horizontally placing the radiation port at the output end of the coupling structure of the gyrotron traveling wave tube to be tested;
secondly, placing the input end of the waveguide probe at a position 1-2mm away from the output end radiation port of the coupling structure of the gyrotron traveling wave tube to be detected; connecting the flange end of the output end of the waveguide probe with the input end of a standard WR6 waveguide; the output end of the standard WR6 waveguide is connected with a probe waveguide port of the power meter;
horizontally placing the waveguide probe, the standard WR6 waveguide and the power meter probe on a three-dimensional adjusting platform;
and fourthly, after the power meter is electrified, preheated and reset, starting a signal source, moving and adjusting the three-dimensional position of the three-dimensional adjusting platform, recording the position information of the three-dimensional adjusting platform and the power value of the power meter, and describing the field distribution condition of the output radiation port of the gyrotron traveling wave tube coupling structure by utilizing the position information of the three-dimensional adjusting platform and the power value of the power meter to obtain the field distribution diagram of the gyrotron traveling wave tube coupling structure to be tested.
2. The field distribution testing system for a gyrotron traveling wave tube coupling structure of claim 1, wherein said waveguide probe is a structure with a trapezoidal metal input end.
3. The field distribution test system for the gyrotron traveling wave tube coupling structure according to claim 2, wherein the approach distance between the trapezoidal metal input end of the waveguide probe and the output end of the gyrotron traveling wave tube coupling structure to be tested is 1 to 2mm.
4. The field distribution testing system for a gyrotron traveling-wave tube coupling structure according to claim 1, wherein the gyrotron traveling-wave tube coupling structure to be tested is a mode conversion structure having an open-field structure; and the open-field radiation surface of the mode conversion structure of the open-field structure is the radiation direction of the microwave signal.
5. The field distribution testing system for a gyrotron traveling wave tube coupling structure according to claim 1, wherein the standard WR6 waveguide has a waveguide size of 1.651mm x 0.826mm, and a measurement frequency range of 110GHz to 170GHz.
6. The field distribution testing system for a gyrotron traveling wave tube coupling structure according to claim 1, wherein the position information of the three-dimensional adjusting platform and the power value information of the power meter directly depict the field distribution of the radiation port by a graph through MATLAB software, and directly reflect the field distribution information of the gyrotron traveling wave tube coupling structure at the position of the radiation port.
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| JPS5635106A (en) * | 1979-08-31 | 1981-04-07 | Fujitsu Ltd | Optical fiber coupler |
| US4897609A (en) * | 1987-12-28 | 1990-01-30 | Raytheon Company | Axially coupled gyrotron and gyro TWTA |
| US5508630A (en) * | 1994-09-09 | 1996-04-16 | Board Of Regents, University Of Texas Systems | Probe having a power detector for use with microwave or millimeter wave device |
| CN100588919C (en) * | 2008-01-22 | 2010-02-10 | 西北工业大学 | Device for measuring radiation and scattered light field three dimensional distribution |
| JP5085728B2 (en) * | 2008-05-09 | 2012-11-28 | アンリツ株式会社 | Method for measuring radiated power, coupler for measuring radiated power and apparatus for measuring radiated power |
| JP2009047713A (en) * | 2008-12-05 | 2009-03-05 | Fujitsu Ltd | Light waveform measuring device and light waveform measuring method |
| CN102520264A (en) * | 2011-11-30 | 2012-06-27 | 西安交通大学 | Tapered fiber-slab waveguide coupling structure-based electric field sensor and measurement system |
| CN103605066A (en) * | 2013-08-30 | 2014-02-26 | 西安空间无线电技术研究所 | Passive intermodulation test system employing single power amplifier |
| CN105004930B (en) * | 2014-04-23 | 2018-06-29 | 华南师范大学 | A kind of novel microwave sounding method and device and application |
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| CN206583979U (en) * | 2016-08-24 | 2017-10-24 | 中国工程物理研究院应用电子学研究所 | Field distribution test system for gyrotron traveling wave tube coupled structure |
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