CN110011645B - X-band cavity type comb spectrum generator - Google Patents
X-band cavity type comb spectrum generator Download PDFInfo
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- CN110011645B CN110011645B CN201910400844.8A CN201910400844A CN110011645B CN 110011645 B CN110011645 B CN 110011645B CN 201910400844 A CN201910400844 A CN 201910400844A CN 110011645 B CN110011645 B CN 110011645B
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- resonant rod
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- inductor
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- 238000001228 spectrum Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims description 6
- 230000005284 excitation Effects 0.000 abstract description 9
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 235000013599 spices Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/84—Generating pulses having a predetermined statistical distribution of a parameter, e.g. random pulse generators
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Abstract
The invention relates to an X-band cavity type comb spectrum generator, which consists of a fixed resonant rod, a band-pass filter, a load and a waveguide resonant cavity; the fixed resonant rod is arranged in the waveguide resonant cavity to form an input matching component, a section of step diode is welded at the tail end of the fixed resonant rod, and one end of the section of step diode is inserted into the waveguide resonant cavity. The scheme adopts a fixed resonant rod and a waveguide cavity to realize a matching network and a pulse generating circuit. The input matching excitation component formed by the fixed resonant rod and the waveguide resonant cavity ensures good impedance matching of the port, and simultaneously ensures the output power of higher order harmonic waves due to the higher Q value of the port; the waveguide cavity type structure is better in heat dissipation than a traditional circuit. The adoption welds the one section of festival step diode on the resonance pole, and the other end inserts the structural mode in the cavity, has reduced the debugging degree of difficulty to a certain extent, and the technology reliability is better.
Description
Technical Field
The invention relates to the field of comb spectrum generators, in particular to an X-band cavity type comb spectrum generator.
Background
The comb spectrum generator is a device which can generate abundant harmonic waves by inputting a radio frequency signal, and utilizes enough power to push a step recovery diode (Step recovery diode, SRD, step tube for short) to generate multiple harmonic waves, so that frequency sources of X wave bands and above can be obtained. At present, a step tube is used for designing a comb spectrum generator, a matching network and a pulse generating circuit are designed by using an adjustable coil, and two ends of a diode are welded on a micro-band circuit to form a micro-band plane structure. But the Q value of the adjustable coil is lower, the port matching is poorer, so that the output power of higher-order harmonic waves is not high; and the problems of high debugging difficulty, poor heat dissipation capability, difficult replacement after diode failure and the like exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an X-band cavity type comb spectrum generator, which adopts a fixed resonant rod and a waveguide cavity to realize a matching network and a pulse generation circuit. The input matching excitation component formed by the fixed resonant rod and the waveguide resonant cavity ensures good impedance matching of the port, and simultaneously ensures the output power of higher order harmonic waves due to the higher Q value of the port; the waveguide cavity type structure is better in heat dissipation than a traditional circuit. The adoption welds the one section of festival step diode on the resonance pole, and the other end inserts the structural mode in the cavity, has reduced the debugging degree of difficulty to a certain extent, and the technology reliability is better.
The aim of the invention is realized by the following technical scheme:
an X-band cavity type comb spectrum generator consists of a fixed resonant rod, a band-pass filter, a load and a waveguide resonant cavity;
the fixed resonant rod is arranged in the waveguide resonant cavity to form an input matching component, a section of step diode is welded at the tail end of the fixed resonant rod, and one end of the section of step diode is inserted into the waveguide resonant cavity;
the band-pass filter and the load are respectively fixed on the front side and the rear side of the waveguide resonant cavity.
As a further improvement of the invention, the step diode parameters are selected as: step time t st ：t st ≤1/f 0 The method comprises the steps of carrying out a first treatment on the surface of the Small lifetime τ: τ is greater than or equal to 1/2 pi f i The method comprises the steps of carrying out a first treatment on the surface of the Reverse junction capacitance C j ：C j ＝l/2πf 0 x N Wherein x is N For impedance level, 10Ω<x N <20Ω。
Furthermore, the fixed resonant rod is integrally provided with a first inductor and a second inductor, and the first inductor, the second inductor and the step diode are sequentially connected in series. Through the design of ladder formula structure, realize two sets of different inductance value. According to the resonant rod, two groups of inductors and the step diode are connected in series through the integrated design, so that loss caused by welding of discrete devices is reduced.
Furthermore, the first inductor is of an S-shaped reciprocating structure, and the propagation length of signals is increased under the condition of the same length through the S-shaped reciprocating structure design, so that the inductance of the group of inductors is ensured. The surface area of the conductor is effectively increased, so that the influence of the skin effect of the high-frequency signal is overcome, and the Q value is 30-40% higher than the inductance with the same sectional area.
Furthermore, the surface silver plating treatment is adopted on the surface of the fixed resonant rod, and the whole resonant rod adopts the surface silver plating treatment, so that the conductivity of a conductor can be increased, namely the inductance and the direct current resistance are reduced, and the resonant rod has a Q value 50-60% higher than that of a conventional adjustable coil.
The beneficial effects of the invention are as follows:
1. the input matching excitation assembly formed by the fixed resonant rod and the waveguide resonant cavity forms a matching network by utilizing the matching between the resonant rod and the cavity on one hand, so that good impedance matching of the port is ensured, and the output power of higher-order harmonic waves is ensured by utilizing a higher Q value on the other hand;
2. the waveguide cavity type structure has a larger heat conducting surface compared with the traditional plane structure, so that the waveguide cavity type structure is better in heat dissipation than the traditional plane structure circuit.
3. The adoption welds the one section of festival step diode on the resonance pole, and the other end inserts the structural mode in the cavity, has reduced the debugging degree of difficulty to a certain extent, and the technology reliability is better.
Drawings
FIG. 1 is a side view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a top view of the present invention;
FIG. 4 is a schematic diagram of a waveguide resonant cavity structure;
FIG. 5 is a schematic structural view of a stationary resonant rod;
FIG. 6 is a cross-sectional view of a bandpass filter;
FIG. 7 is a simulation test chart of the present invention;
FIG. 8 is a simulation of a bandpass filter according to the invention;
FIG. 9 is an equivalent circuit diagram of a stationary resonant rod of the present invention;
FIG. 10 is a diagram of a node step diode Spice model of the present invention;
fig. 11 is an equivalent circuit of the present invention.
Detailed Description
The technical scheme of the present invention is described in further detail below with reference to specific embodiments, but the scope of the present invention is not limited to the following description.
As shown in fig. 1-3, an X-band cavity type comb spectrum generator is characterized by comprising a fixed resonant rod 1, a band-pass filter 2, a load 3 and a waveguide resonant cavity 4; the fixed resonant rod 1 is arranged in the waveguide resonant cavity 4 to form an input matching component, a section of step diode 21 is welded at the tail end of the fixed resonant rod 1, and one end of the section of step diode 21 is inserted into the waveguide resonant cavity 4; the band-pass filter 2 and the load 3 are respectively fixed on the front side and the rear side of the waveguide resonant cavity 4.
I.e. the input matching excitation assembly is composed of a fixed resonant rod 1 and a waveguide resonant cavity 4.
Wherein the equivalent circuit of the fixed resonant rod 1 is shown in FIG. 9, in whichR g ＝50Ω，R in ＝ω i L＝2πf in L, fin is the input frequency, L is the excitation inductance.
By calculating the parameters, the actual materials of the structure are used, and the outline diagram of the fixed resonant rod 1 is shown in fig. 5.
The fixed resonant rod 1 is integrally designed with a first inductor 22 and a second inductor 23, and the first inductor 22, the second inductor 23 and the step diode 21 are sequentially connected in series. The first inductor 22 and the second inductor 23 are distributed in a step structure, i.e. two stages are formed by arranging the two inductors at intervals one above the other. The first inductor 22 is of an S-shaped reciprocating structure, and the surface of the fixed resonant rod 1 is silver-plated.
Waveguide resonant cavity 4 provides excitation inductance and tuning capacitance for step diode
Wherein, xi is an attenuation factor, and is generally 0.3 and t for simplifying calculation P Is an ideal pulse width.
The step diode 21 parameters are selected as: step time t st ：t st ≤1/f 0 The method comprises the steps of carrying out a first treatment on the surface of the Small lifetime τ: τ is greater than or equal to 1/2 pi f i The method comprises the steps of carrying out a first treatment on the surface of the Reverse-rotationJunction capacitor C j ：C j ＝l/2πf 0 x N Wherein x is N For impedance level, 10Ω<x N <20Ω；
In addition, the parameters of the step diode include input power and the like. Due to the low power frequency multiplier used as a local oscillator,
a typical step diode is satisfactory and is therefore not considered here. Through calculation of the parameters, the SRD device MMD820-C12 provided by MA-COM company is finally selected, the reverse junction capacitance is 1.7P, the step time is 95ps, the service life is 60ns, the design parameter requirements are met, and the Spice model is shown in figure 10.
As shown in FIG. 6, the band-pass filter forms a resonant circuit through a groove in the cavity, selects a frequency band, simulates an equivalent circuit thereof, and obtains a simulation result as shown in FIG. 8
The input signal is transmitted to an input matching excitation component consisting of a fixed resonant rod and a waveguide resonant cavity through an external bias circuit, and the matching excitation component is used for realizing conjugate matching with the internal resistance of an input signal source on one hand and ensuring that the input voltage is effectively added to a step pipe. On the other hand, the diode has the functions of exciting an inductor and tuning a capacitor, so that the step tube stores energy when being conducted, converts the energy into pulse energy at the moment of being conducted, and enables the impedance of the input end of the diode to be pure resistive. Under the combined action of the signal source and the matching excitation component, the step diode converts the energy of the input signal into a narrow large-amplitude pulse with rich harmonic, the schematic diagram of the step diode is shown in fig. 11, the spectrum tester is used for testing the embodiment, the obtained test parameters are shown in fig. 7, and the data are shown in the following table.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (2)
1. An X-band cavity type comb spectrum generator is characterized by comprising a fixed resonant rod (1), a band-pass filter (2), a load (3) and a waveguide resonant cavity (4);
the fixed resonant rod (1) is arranged in the waveguide resonant cavity (4) to form an input matching component, a step diode (21) is welded at the tail end of the fixed resonant rod (1), and one end of the step diode (21) is inserted into the waveguide resonant cavity (4);
the band-pass filter (2) and the load (3) are respectively fixed on the front side and the rear side of the waveguide resonant cavity (4);
the step diode (21) parameters are selected as: step time t st ：t st ≤1/f 0 The method comprises the steps of carrying out a first treatment on the surface of the Small lifetime τ: τ is greater than or equal to 1/2 pi f i The method comprises the steps of carrying out a first treatment on the surface of the Reverse junction capacitance C j ：C j ＝l/2πf 0 x N Wherein x is N For impedance level, 10Ω<x N <20Ω；
The fixed resonant rod (1) is integrally provided with a first inductor (22) and a second inductor (23), and the first inductor (22), the second inductor (23) and the step diode (21) are sequentially connected in series;
the first inductor (22) and the second inductor (23) are distributed in a stepped structure;
the first inductor (22) is of an S-shaped reciprocating structure.
2. The X-band cavity comb spectrum generator according to claim 1, characterized in that the surface of the stationary resonant rod (1) is silvered.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910400844.8A CN110011645B (en) | 2019-05-15 | 2019-05-15 | X-band cavity type comb spectrum generator |
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| CN201910400844.8A CN110011645B (en) | 2019-05-15 | 2019-05-15 | X-band cavity type comb spectrum generator |
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| CN110011645B true CN110011645B (en) | 2024-02-20 |
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| GB1194662A (en) * | 1968-01-27 | 1970-06-10 | Telefunken Patentverwertunsges | Improvements in or relating to Tunable Single Stage Semi-Conductor Frequency Multipliers |
| US4636758A (en) * | 1984-01-27 | 1987-01-13 | Alcatel Thomson Faisceaux Herziens | Frequency multiplier for millimeter waves having means for adjusting harmonic frequency |
| CN101694917A (en) * | 2009-09-23 | 2010-04-14 | 中国科学院武汉物理与数学研究所 | Mini microwave cavity |
| CN102236089A (en) * | 2010-04-28 | 2011-11-09 | 中国科学院电子学研究所 | Transceiving system of synthetic aperture radar with super-high resolution |
| CN103929132A (en) * | 2014-04-24 | 2014-07-16 | 成都锦江电子系统工程有限公司 | Small high-power microwave amplification module based on strip line mode |
| CN107359861A (en) * | 2017-06-01 | 2017-11-17 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High-order odd harmonic THz sources frequency multiplier |
| CN209897020U (en) * | 2019-05-15 | 2020-01-03 | 成都锦江电子系统工程有限公司 | X-waveband cavity type comb spectrum generator |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2997027B1 (en) * | 2012-10-19 | 2015-01-02 | Centre Nat Rech Scient | VOLUME TRANSDUCER GUIDED IN SUFACE BY SYNCHRONOUS EXCITATION STRUCTURES |
| US20160213303A1 (en) * | 2015-01-22 | 2016-07-28 | Elwha LLC, a limited liability company of the State of Delaware | Devices and methods for remote hydration measurement |
| US11437775B2 (en) * | 2015-08-19 | 2022-09-06 | Kyocera Sld Laser, Inc. | Integrated light source using a laser diode |
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2019
- 2019-05-15 CN CN201910400844.8A patent/CN110011645B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1276273A (en) * | 1959-12-17 | 1961-11-17 | Western Electric Co | Hyper-frequency pulse amplifiers |
| GB1194662A (en) * | 1968-01-27 | 1970-06-10 | Telefunken Patentverwertunsges | Improvements in or relating to Tunable Single Stage Semi-Conductor Frequency Multipliers |
| US4636758A (en) * | 1984-01-27 | 1987-01-13 | Alcatel Thomson Faisceaux Herziens | Frequency multiplier for millimeter waves having means for adjusting harmonic frequency |
| CN101694917A (en) * | 2009-09-23 | 2010-04-14 | 中国科学院武汉物理与数学研究所 | Mini microwave cavity |
| CN102236089A (en) * | 2010-04-28 | 2011-11-09 | 中国科学院电子学研究所 | Transceiving system of synthetic aperture radar with super-high resolution |
| CN103929132A (en) * | 2014-04-24 | 2014-07-16 | 成都锦江电子系统工程有限公司 | Small high-power microwave amplification module based on strip line mode |
| CN107359861A (en) * | 2017-06-01 | 2017-11-17 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High-order odd harmonic THz sources frequency multiplier |
| CN209897020U (en) * | 2019-05-15 | 2020-01-03 | 成都锦江电子系统工程有限公司 | X-waveband cavity type comb spectrum generator |
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| CN110011645A (en) | 2019-07-12 |
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