CN106159400A - A kind of twisted waveguide separate type directrix plane folded waveguide - Google Patents
A kind of twisted waveguide separate type directrix plane folded waveguide Download PDFInfo
- Publication number
- CN106159400A CN106159400A CN201610745773.1A CN201610745773A CN106159400A CN 106159400 A CN106159400 A CN 106159400A CN 201610745773 A CN201610745773 A CN 201610745773A CN 106159400 A CN106159400 A CN 106159400A
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- Prior art keywords
- waveguide
- twisted
- separate type
- bend
- directrix plane
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/10—Wire waveguides, i.e. with a single solid longitudinal conductor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
- H01J23/24—Slow-wave structures, e.g. delay systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
- H01J25/34—Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P9/00—Delay lines of the waveguide type
- H01P9/006—Meander lines
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Abstract
The invention discloses a kind of twisted waveguide separate type directrix plane folded waveguide, lead periodic structure and input and output waveguide including at least 2 be sequentially communicated along Z-direction shortwave.Twisted waveguide separate type directrix plane folded waveguide is consisted of some U-bend waveguides, twisted waveguide section and straight wave guide.When applying in travelling-wave tube isoline electromagnetic wave vacuum device, compared with traditional folded waveguide, the 180 degree of differences brought due to U-bend waveguide existed when instant invention overcomes electron beam by traditional slow-wave structure, can be advantageously in the bandwidth of operation of broadening electromagnetic wave source.This directrix plane structure makes us to be all arranged on base by all of electromagnetic wave structure, uses Numerical-control Milling Machines once to complete, to guarantee machining accuracy and to reduce processing cost.This twisted waveguide separate type directrix plane folded waveguide can realize the compact delay line of various waveguide, single ridged waveguides or double ridged waveguide, the particularly slow-wave structure etc. of compact travelling-wave tube amplifier.
Description
Technical field
The present invention relates to a kind of electromagnetic transmission line.Specifically, one is related to for signal delay or electromagnetic wave source
The compact twisted waveguide separate type directrix plane folded waveguide of slow-wave structure.
Background technology
First important application of folded transmission lines is as signal delay line, prolongs for signal in the systems such as radar
Late.Second important application of folded transmission lines is to use as slow-wave structure in travelling-wave tube amplifier.At this moment, electron beam edge
Certain straight line electron passage is propagated, and electromagnetic wave is then propagated along the transmission line of bending.Although propagating in bending transmission line
The phase velocity of electromagnetic wave quickly, can be close to the light velocity, the even greater than light velocity, but in this straight line electron passage, electron beam
The phase velocity of the electromagnetic wave experienced can be well below the light velocity.The beam energy using the travelling-wave tube that quasi-folded waveguide constitutes can
To be substantially reduced, the beneficially miniaturization of device.
Traditional folded transmission lines typically uses transmission line continuous bend to form.Such as waveguide delay line is by waveguide bend
Stack.Owing to too small bending curvature radius will cause the reflection of signal, the volume of this delay line is the biggest.Fold
Common slow-wave structure in waveguide travelling-wave tube amplifier uses rectangular waveguide section the most alternately to connect and compose with U-shaped waveguide end,
There is bulky problem equally.Another problem that common folded waveguide travelling-wave tube exists is bandwidth problem.This travelling-wave tube
The folded waveguide of middle employing is generally two-dimensional structure, and waveguide is in a plane crossing Z axis, continuous bend in such as XZ plane.?
In this folded waveguide, the electronics propagated along Z axis when by the folded waveguide in a cycle, have two mutual with electromagnetic wave
The region of effect.In the two interaction region, the phase contrast of the electromagnetic wave that the electron beam of transmission is experienced removes electromagnetic wave edge
Outside the phase contrast that the bending approach transmission of this folded waveguide is determined, also include 180 degree of bending waveguides causes due to transmission line
The what is called " Shape-phase is poor " of reversely determined 180 degree of electromagnetic field direction.The existence of this Shape-phase difference so that along Z axis
The electron beam that direction is propagated and the electromagnetic wave propagated along folded waveguide are under the conditions of the speed sync of Z-direction, at same period
In two interaction regions in, suffered by electron beam along Z-direction active force can switching direction, cause electromagnetic wave from electricity
The energy that son bundle obtains is cancelled out each other.In order to solve this problem, electron beam is along speed and the electromagnetic wave of Z-direction along Z-direction
Average phase velocity must mismatch.Thus bring the serious of the relative bandwidth to folded waveguide travelling-wave tube to limit.
Summary of the invention
It is an object of the invention to provide a kind of twisted waveguide separate type directrix plane folded waveguide not having Shape-phase difference.This
The features such as scheme has simple in construction, easy to process, operating frequency width, compact conformation.
To achieve these goals, our scheme is, a kind of twisted waveguide separate type directrix plane folded waveguide.Described torsional wave
Lead separate type directrix plane folded waveguide and include that at least 2 being sequentially communicated along Z-direction and repeating shortwaves lead periodic structure,
Twisted waveguide separate type directrix plane folded waveguide two ends are provided with input and output waveguide.
There is a straight line AB parallel with Z axis, described straight line AB and any one shortwave described leads the friendship of periodic structure
Collection is two continuous line segment CD not being joined directly together mutually and line segment EF.
There is at least straight line electron beam passage being parallel to Z axis；Described straight line electron beam passage and described straight line AB
Overlap；Described line segment CD leads the maximum amplitude point of the electric field intensity of electromagnetic wave in periodic structure by described shortwave.
The both ends of the surface that described shortwave leads periodic structure are all parallel with YZ plane；Described shortwave leads periodic structure
Both ends of the surface be shaped as rectangular waveguide, single ridge rectangular waveguide or double ridge rectangular waveguide；Described arbitrary shortwave leads periodic structure
The broadside of both ends of the surface all parallel with Y direction.
When the frequency of electromagnetic wave is close to the cut-off frequency of the mode of operation of described folded waveguide, Z axis is any one with described
The direction of the electric field that individual shortwave leads the electromagnetic wave at two common factors of periodic structure is identical.
The shortwave of the present invention leads periodic structure 2 kinds of structures, and the first structure is: adjacent 2 shortwaves lead cycle knot
Structure is directly connected to, and each shortwave is led periodic structure and at least included 2 U-bend waveguides laying respectively at Y-axis both sides, U-bend
The recess of waveguide is towards Y-axis, and same shortwave is led 2 U-bend waveguides in periodic structure and used waveguide segment structure to connect, one
Waveguide segment structure is used to be connected between one end of U-bend waveguide and one end of another U-bend waveguide, each described waveguide segment
Structure includes a waveguide segment being positioned in Y-axis and 2 twisted waveguide sections laying respectively at waveguide segment both sides, and twisted waveguide section is positioned at U
Gap location between end and the end face of waveguide segment of shape waveguide bend.
The second structure is: adjacent 2 shortwaves are led periodic structure and are directly connected to；Each shortwave leads periodic structure extremely
Including 2 U-bend waveguides laying respectively at Y-axis both sides less, the recess of U-bend waveguide is towards Y-axis, and same shortwave leads cycle knot
2 U-bend waveguides in structure use waveguide segment structure to connect, one end of a U-bend waveguide and the one of another U-bend waveguide
Using waveguide segment structure to connect between end, each described waveguide segment structure includes a waveguide segment being positioned in Y-axis and 1 position
Twisted waveguide section in waveguide segment one end；Same shortwave is led in periodic structure, and the one end of the U-bend waveguide of Y-axis side is direct
Being connected with waveguide segment, the one end of the U-bend waveguide of Y-axis opposite side is directly connected with twisted waveguide section, and whole twisted waveguide separates
In formula directrix plane folded waveguide, 2 adjacent twisted waveguide sections lay respectively at Y-axis both sides；Described twisted waveguide section is by 2 L-shaped waveguides
Section overlaps the composition that links together, and it is flip horizontal state that a L-shaped waveguide segment compares another L-shaped waveguide segment.
In described all U-bend waveguides, at least one form parameter of the cross section of at least one is with this twisted waveguide separate type
The change relatively of the centrage of directrix plane folded waveguide is more than 10%；In all waveguide segments at least the one of the cross section of at least one
Individual form parameter is more than 10% with the change relatively of the centrage of this twisted waveguide separate type directrix plane folded waveguide.
Described in each, shortwave is led in periodic structure, and two adjacent twisted waveguide sections are not joined directly together；Described U
Shape waveguide bend is the U-bend waveguide of H face.
Described waveguide segment is rectangular waveguide.
Described twisted waveguide section is L-shaped waveguide segment.
Straight line electron beam passage runs through all waveguide segments.
Described U-bend waveguide is the U-bend waveguide of E face.
The both ends of the surface that described shortwave leads periodic structure are all parallel with YZ plane；Described shortwave leads periodic structure
Both ends of the surface be shaped as rectangle；The broadside of the both ends of the surface that described arbitrary shortwave leads periodic structure is all parallel with Y direction；Institute
State the upper surface flush of twisted waveguide separate type directrix plane folded waveguide；Here described twisted waveguide separate type directrix plane folds ripple
Lead, including all U-bend waveguides, all waveguide segments, and all twisted waveguide sections.
For the ease of processing, the upper surface flush of described twisted waveguide separate type directrix plane folded waveguide；Here described torsion
Waveguide separate type directrix plane folded waveguide, including all U-bend waveguides, all waveguide segments, and all twisted waveguide sections.This standard
Planar structure makes us to be all arranged on base by all of electromagnetic wave structure, uses Numerical-control Milling Machines once to complete,
To guarantee machining accuracy and to reduce processing cost.
The present invention proposes employing rectangular waveguide, single ridged waveguides, double ridged waveguide or the various cycles of other shapes of waveguide
Property twisted waveguide separate type directrix plane folded waveguide.Traditional twisted waveguide separate type directrix plane at existing folded waveguide travelling-wave tube
On the basis of folded waveguide, solve the broadband between electron beam and the electromagnetic wave that Shape-phase difference band comes well and Tong Bu ask
Topic.This directrix plane structure makes us to be all arranged on base by all of electromagnetic wave structure, uses Numerical-control Milling Machines
Once complete, to guarantee machining accuracy and to reduce processing cost.This invention is also used as compact signal delay line.Using should
Twisted waveguide separate type directrix plane folded waveguide is as the interaction waveguide of travelling-wave tube, it is expected to be substantially reduced high-frequency microwave, millimeter wave,
The even beam energy needed for THz devices its bandwidth of operation of broadening.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of embodiment 1 of the present invention；
Fig. 2 is the elevational schematic view of embodiment 1 of the present invention；
Fig. 3 is that the shortwave of embodiment 1 of the present invention leads periodic structure schematic diagram；
Fig. 4 is the twisted waveguide schematic diagram of embodiment 1 of the present invention；
Fig. 5 is that the shortwave of embodiment 2 of the present invention leads periodic structure schematic diagram；
Label correspondence title in accompanying drawing: 1-input and output waveguide, 2-waveguide segment, 4-U shape waveguide bend, 5-twisted waveguide section, 7-straight line
Electron beam channel.
Embodiment 1
As Figure 1-4.
A kind of twisted waveguide separate type directrix plane folded waveguide, including be sequentially communicated along Z-direction and repeat at least 5
Shortwave leads periodic structure and input and output waveguide 1.Adjacent 2 shortwaves are led periodic structure and are directly connected to, and each shortwave is led
Periodic structure at least includes 2 U-bend waveguides 4 laying respectively at Y-axis both sides, the recess of U-bend waveguide towards Y-axis, same
2 U-bend waveguides 4 that shortwave is led in periodic structure use waveguide segment structure to connect, one end of a U-bend waveguide 4 and another
Using waveguide segment structure to connect between one end of individual U-bend waveguide 4, each described waveguide segment structure includes that is positioned at a Y-axis
On waveguide segment 2 and 2 twisted waveguide sections 5 laying respectively at waveguide segment 2 both sides, twisted waveguide section 5 is positioned at the end of U-bend waveguide 4
And the gap location between the end face of waveguide segment 2.
There is a straight line AB parallel with Z axis, described straight line AB and any one shortwave described leads the friendship of periodic structure
Collection is two continuous line segment CD not being joined directly together mutually and line segment EF.
There is a straight line electron beam passage 7 being parallel to Z axis；Described straight line electron beam passage 7 and described straight line AB weight
Close；Described line segment CD leads the maximum amplitude point of the electric field intensity of electromagnetic wave in periodic structure by described shortwave.
The both ends of the surface that described shortwave leads periodic structure are all parallel with YZ plane；Described shortwave leads periodic structure
Both ends of the surface be shaped as rectangular waveguide；Described arbitrary shortwave is led the broadside of the both ends of the surface of periodic structure and is all put down with Y direction
OK.
When the frequency of electromagnetic wave is close to the cut-off frequency of the mode of operation of described folded waveguide, described straight line AB is with described
Any two is led the phase contrast of the electromagnetic wave at the common factor of periodic structure along the shortwave that Z-direction is adjacent and is leveled off to zero.
Each shortwave is led periodic structure and is included 2 U-bend waveguides 4 and 2 waveguide segments 2.Each shortwave leads week
Phase structure also includes 4 twisted waveguide sections 5.
The height of described 2 U-bend waveguides 4 and this U-bend waveguide 4 twisted waveguide separate type standard of the width of 2 waveguide segments 2 are put down
The change relatively of the centrage of face folded waveguide is more than not shown in 10%(figure).
When the frequency of electromagnetic wave is close to the cut-off frequency of the mode of operation of described folded waveguide, Z axis is any one with described
The direction of the electric field that individual shortwave leads the electromagnetic wave at two common factors of periodic structure is identical.
Described in each, shortwave is led in periodic structure, and two adjacent twisted waveguides are not joined directly together；Described U-shaped
Waveguide bend 4 is H face U-bend waveguide 4.
The upper surface flush of described twisted waveguide separate type directrix plane folded waveguide；Here described twisted waveguide separate type is accurate
Flat-folded waveguide, including all U-bend waveguides 4, all waveguide segments 2, and all twisted waveguide sections 5.
Embodiment 2
As shown in Figure 5.
Compared with embodiment 1, the difference is that only:
Here all U-bend waveguides 4 are E face U-bend waveguide 4.Lead in periodic structure at each shortwave, each two torsional wave
Lead and be connected directly to each other composition one group.Not being joined directly together mutually between two groups of twisted waveguides, concrete, adjacent 2 shortwaves lead the cycle
Structure is directly connected to；Each shortwave is led periodic structure and is at least included 2 U-bend waveguides 4 laying respectively at Y-axis both sides, U-shaped
The recess of waveguide bend is towards Y-axis, and 2 U-bend waveguides 4 that same shortwave is led in periodic structure use waveguide segment structure to connect,
Waveguide segment structure is used to be connected, described in each between one end of one U-bend waveguide 4 and one end of another U-bend waveguide 4
Waveguide segment structure includes a waveguide segment being positioned in Y-axis 2 and 1 twisted waveguide section 5 being positioned at waveguide segment 2 one end；Same the shortest
In waveguide periodic structure, the one end of the U-bend waveguide 4 of Y-axis side is directly connected with waveguide segment 2, the U-bend of Y-axis opposite side
The one end of waveguide 4 is directly connected with twisted waveguide section 5, and in whole twisted waveguide separate type directrix plane folded waveguide, adjacent 2
Twisted waveguide section 5 lays respectively at Y-axis both sides；Described twisted waveguide section 5 is linked together by 2 L-shaped waveguide segment overlappings and forms, a L
It is flip horizontal state that shape waveguide segment compares another L-shaped waveguide segment.
More than we illustrate several embodiments of twisted waveguide separate type directrix plane folded waveguide.In these examples,
In order to draw the convenience of schematic diagram, the periodicity of twisted waveguide separate type directrix plane folded waveguide is 3-6.It practice, at electromagnetism
Wave source, particularly in travelling-wave tube, the periodicity of twisted waveguide separate type directrix plane folded waveguide can up to tens.Meanwhile,
In above embodiment, in order to process these twisted waveguide separate type directrix plane folded waveguides, need to take line cutting, number number
The processing methods such as control turnning and milling, many interior angles need chamfered.These chamferings can be to twisted waveguide separate type directrix plane folded waveguide
Performance produce impact, must take in when Modeling Calculation.
Claims (8)
1. a twisted waveguide separate type directrix plane folded waveguide, it is characterised in that X-axis, Y-axis and Z axis form right angle coordinate are set
It is and meets the right-hand rule；O point is coordinate origin；Described twisted waveguide separate type directrix plane folded waveguide includes along Z-direction
At least 2 shortwaves being sequentially communicated and repeat lead periodic structure, and the shortwave cycle of leading referred in the waveguide week that Z-direction length is the shortest
Phase；Adjacent 2 shortwaves are led periodic structure and are directly connected to；Each shortwave is led periodic structure and is at least included that 2 lay respectively at Y
The U-bend waveguide (4) of axle both sides；The recess of U-bend waveguide is towards Y-axis；Same shortwave leads 2 U-bends in periodic structure
Waveguide (4) uses waveguide segment structure to connect；One end of one end of one U-bend waveguide (4) and another U-bend waveguide (4) it
Between use waveguide segment structure connect；Each described waveguide segment structure includes a waveguide segment being positioned in Y-axis (2) and 2 points
It is not positioned at the twisted waveguide section (5) of waveguide segment (2) both sides；Twisted waveguide section (5) is positioned at end and the waveguide segment (2) of U-bend waveguide (4)
End face between gap location；Described twisted waveguide section (5) is L-shaped waveguide segment.
A kind of twisted waveguide separate type directrix plane folded waveguide the most according to claim 1, it is characterised in that have one and Z
The straight line AB that axle is parallel, described straight line AB with described any one shortwave lead the common factor of periodic structure be two the most direct
The continuous line segment CD being connected and line segment EF.
A kind of twisted waveguide separate type directrix plane folded waveguide the most according to claim 2, it is characterised in that exist at least
A piece straight line electron beam passage (7) being parallel to Z axis；Described straight line electron beam passage (7) overlaps with described straight line AB；Described line
Section CD and EF leads the maximum amplitude point of the electric field intensity of electromagnetic wave in periodic structure by described shortwave.
A kind of twisted waveguide separate type directrix plane folded waveguide the most according to claim 2, when the frequency of electromagnetic wave is close to institute
During the cut-off frequency of the mode of operation stating folded waveguide, described straight line AB and described any two are along the adjacent shortwave of Z-direction
Lead the phase contrast of the electromagnetic wave at the common factor of periodic structure and level off to zero.
A kind of twisted waveguide separate type directrix plane folded waveguide the most according to claim 1, it is characterised in that described all U
In shape waveguide bend (4), at least one form parameter of the cross section of at least one is with this twisted waveguide separate type directrix plane folded waveguide
The relatively change of centrage more than 10%；In all waveguide segments (2) at least one form parameter of the cross section of at least one with
The change relatively of the centrage of this twisted waveguide separate type directrix plane folded waveguide is more than 10%.
A kind of twisted waveguide separate type directrix plane folded waveguide the most according to claim 1, it is characterised in that at each
Described shortwave is led in periodic structure, and two adjacent twisted waveguide sections are not joined directly together；Described U-bend waveguide (4) is H face
U-bend waveguide.
A kind of twisted waveguide separate type directrix plane folded waveguide the most according to claim 1, it is characterised in that described waveguide
Section is rectangular waveguide.
A kind of twisted waveguide separate type directrix plane folded waveguide the most according to claim 3, it is characterised in that straight line electron
Beam passage (7) runs through all waveguide segments (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610745773.1A CN106159400A (en) | 2016-08-29 | 2016-08-29 | A kind of twisted waveguide separate type directrix plane folded waveguide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610745773.1A CN106159400A (en) | 2016-08-29 | 2016-08-29 | A kind of twisted waveguide separate type directrix plane folded waveguide |
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| Publication Number | Publication Date |
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| CN106159400A true CN106159400A (en) | 2016-11-23 |
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| CN201610745773.1A Withdrawn CN106159400A (en) | 2016-08-29 | 2016-08-29 | A kind of twisted waveguide separate type directrix plane folded waveguide |
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|---|---|---|---|---|
| JPS58170201A (en) * | 1982-03-31 | 1983-10-06 | Fujitsu Ltd | Waveguide circuit element |
| CN1701460A (en) * | 2003-10-06 | 2005-11-23 | 株式会社村田制作所 | Twist waveguide and radio device |
| CN101150214A (en) * | 2006-09-19 | 2008-03-26 | 日本电气株式会社 | Polarization transformation |
| CN101572205A (en) * | 2009-06-10 | 2009-11-04 | 电子科技大学 | Zigzag slow-wave line of double ridged waveguide |
| US20110285479A1 (en) * | 2010-05-21 | 2011-11-24 | Kang Yoon W | Slow wave structures using twisted waveguides for charged particle applications |
| US20120081003A1 (en) * | 2010-10-04 | 2012-04-05 | Samsung Electronics Co., Ltd. | Terahertz interaction circuit having ridged structure |
| CN103854939A (en) * | 2014-01-10 | 2014-06-11 | 中国电子科技集团公司第十二研究所 | Arc-shaped curve boundary folding waveguide slow wave structure |
| CN104716406A (en) * | 2015-03-20 | 2015-06-17 | 江苏贝孚德通讯科技股份有限公司 | Waveguide 90-degree turning structure with polarization turning function |
| CN105470075A (en) * | 2015-12-31 | 2016-04-06 | 中国电子科技集团公司第十二研究所 | Energy coupler applicable to cosine grating-loaded folded waveguide slow-wave structure |
| CN205355212U (en) * | 2015-12-25 | 2016-06-29 | 武汉凡谷电子技术股份有限公司 | Rectangular waveguide revolution mechanic that polarizes |
-
2016
- 2016-08-29 CN CN201610745773.1A patent/CN106159400A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58170201A (en) * | 1982-03-31 | 1983-10-06 | Fujitsu Ltd | Waveguide circuit element |
| CN1701460A (en) * | 2003-10-06 | 2005-11-23 | 株式会社村田制作所 | Twist waveguide and radio device |
| CN101150214A (en) * | 2006-09-19 | 2008-03-26 | 日本电气株式会社 | Polarization transformation |
| CN101572205A (en) * | 2009-06-10 | 2009-11-04 | 电子科技大学 | Zigzag slow-wave line of double ridged waveguide |
| US20110285479A1 (en) * | 2010-05-21 | 2011-11-24 | Kang Yoon W | Slow wave structures using twisted waveguides for charged particle applications |
| US20120081003A1 (en) * | 2010-10-04 | 2012-04-05 | Samsung Electronics Co., Ltd. | Terahertz interaction circuit having ridged structure |
| CN103854939A (en) * | 2014-01-10 | 2014-06-11 | 中国电子科技集团公司第十二研究所 | Arc-shaped curve boundary folding waveguide slow wave structure |
| CN104716406A (en) * | 2015-03-20 | 2015-06-17 | 江苏贝孚德通讯科技股份有限公司 | Waveguide 90-degree turning structure with polarization turning function |
| CN205355212U (en) * | 2015-12-25 | 2016-06-29 | 武汉凡谷电子技术股份有限公司 | Rectangular waveguide revolution mechanic that polarizes |
| CN105470075A (en) * | 2015-12-31 | 2016-04-06 | 中国电子科技集团公司第十二研究所 | Energy coupler applicable to cosine grating-loaded folded waveguide slow-wave structure |
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Application publication date: 20161123 |