CN101242019B - Periodical slow wave structure for 2-D electromagnetic belt gap plane crossing wave guide - Google Patents
Periodical slow wave structure for 2-D electromagnetic belt gap plane crossing wave guide Download PDFInfo
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- CN101242019B CN101242019B CN2008100196581A CN200810019658A CN101242019B CN 101242019 B CN101242019 B CN 101242019B CN 2008100196581 A CN2008100196581 A CN 2008100196581A CN 200810019658 A CN200810019658 A CN 200810019658A CN 101242019 B CN101242019 B CN 101242019B
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- waveguide
- slow wave
- metal
- electromagnetic
- metal column
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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
- H01P1/2005—Electromagnetic photonic bandgaps [EPB], or photonic bandgaps [PBG]
Abstract
The present invention discloses a two-dimensional electromagnetic bandgap plane-crossing waveguide period type slow waver structure which comprises a metal electromagnetic bandgap waveguide structure which is arranged with an input port and an output port, the electromagnetic bandgap waveguide structure comprises a cavity which is arranged with a metal partition board, an electronic beam channel and a metal column at the inner part, and the invention is characterized in that the waveguide of the electromagnetic bandgap structure is S-shaped. The invention uses the EBG waveguide structure for realizing the monomode and high coupling impedance operation of the device in large diameter/period ratio. The invention adopts EBG waveguide structure and combines the disk-loaded waveguide to form a slow wave structure, in the same waveband the physical dimension is increased comparing with the original slow wave structure and has better heat radiating character; comparing with the original slow wave structure with same dimension the coupling impedance is evidently increased.
Description
Technical field
The present invention relates to a kind of periodical slow wave structure for 2-D electromagnetic belt gap plane crossing wave guide, belong to the physical electronics technical field.
Background technology
Electromagnetic bandgap structure (is called photon band gap (Photonic Band Gap) in the optical frequency field, be commonly referred to as electro-magnetic bandgap (Electromagnetic Band Gap in microwave regime, EBG)) be a kind of artificial periodic structure, can on the electromagnetic wavelength magnitude, make device and limit wherein electromagnetic wave traffic direction.Utilize the metal electromagnetic bandgap structure to realize that function element such as resonant cavity has very good advantage, can make device be operated in S-band on large-size.But prior art generally adopts EBG defect cavities structure slow wave structure, and the diameter/period ratio that requires the metal lattice point is at the single mode operation state that could guarantee device below 0.4, and less diameter/period ratio will bring the difficulty on the production technology, height when its Q value does not have major diameter/period ratio yet.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of periodical slow wave structure for 2-D electromagnetic belt gap plane crossing wave guide, adopt the EBG waveguide to constitute slow wave structure, can realize single mode operation than under major diameter/period ratio, effectively raise the Q value of device, and can improve the coupling impedance of device.
The present invention adopts following technical scheme:
A kind of periodical slow wave structure for 2-D electromagnetic belt gap plane crossing wave guide, comprise metal electro-magnetic bandgap waveguiding structure, described electro-magnetic bandgap waveguiding structure is provided with input port and output port, described electro-magnetic bandgap waveguiding structure comprises cavity, be provided with metal partion (metp), electronics notes passage and metal column in cavity, the waveguide shapes that it is characterized in that described electro-magnetic bandgap waveguiding structure is the S type.
The EBG waveguiding structure that the present invention adopts, remove the metal pillar along its reciprocal lattice vector direction, constitute line defect, beginning and end in line defect, link to each other with the through hole on the metallic plate, annotate formation improvement coupling cavate electromagnetic wave passage on the direction of propagation at electronics, on the vertical direction of the electronics notes direction of propagation, then constitute the waveguide of S shape electro-magnetic bandgap.On the transversary of slow wave structure, adopt the EBG structure, utilize the limit mould and the selecting frequency characteristic of EBG structure, electromagnetic wave is limit mould and frequency-selecting; On vertical structure, utilize metal partion (metp) structure slow wave.Along the electromagnetic wave that waveguide is transmitted, its longitudinal propagation speed has obtained effectively reducing, thereby makes electromagnetic wave to carry out energy exchange efficiently with the input particle flux at the device center, effectively raises the coupling impedance of device.Slow wave structure of the present invention waveguiding structure in a longitudinal direction is periodic distribution, and its electromagnetic wave access portal vertically is being the intersection distribution, so be called crossing waveguide preiodic type slow wave structure.
Compared with prior art, the present invention has following advantage:
The present invention utilizes S shape EBG waveguiding structure, has realized single mode and the high coupling impedance work of device under major diameter/period ratio.
The present invention utilizes the periodic structure characteristic of electromagnetic bandgap structure, combines with existing slow wave technology, utilizes the suitable slow wave structure of electromagnetic bandgap structure structure, optimizes the coupling impedance characteristic of original slow wave structure.
The present invention adopts the EBG waveguiding structure to constitute slow wave structure in conjunction with disk loaded waveguide, and (disk loaded waveguide is a kind of original slow wave structure, between two metallic plates, be air, metallic plate is annotated the direction of propagation along electronics and is arranged, vertical with the electronics notes direction of propagation), under identical wave band, physical dimension increases than original slow wave structure, therefore has better heat dissipation characteristics; Compare with original slow wave structure of same size, coupling impedance obviously improves.
Description of drawings
The invention will be further elaborated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the structure cutaway view of slow wave structure of the present invention;
Fig. 2 is the top view profile of slow wave structure of the present invention;
Fig. 3 is the waveguide type electromagnetic bandgap structure two-dimensional structure schematic diagram that the present invention adopts;
Fig. 4 is that the circuit of S type EBG of the present invention waveguide forms schematic diagram;
Fig. 5 is an electromagnetic bandgap structure band gap zoning schematic diagram among the present invention;
Fig. 6 is the band gap diagram of electromagnetic bandgap structure among the present invention;
Fig. 7 is that slow wave structure of the present invention is 0.3 o'clock basic mode mould field pattern at diameter/period ratio;
Fig. 8 is that slow wave structure of the present invention is 0.3 o'clock high-rder mode mould field pattern at diameter/period ratio;
Fig. 9 is that the present invention is 0.3 o'clock dispersion curve and coupling impedance performance plot at diameter/period ratio;
Figure 10 is that the present invention is 0.6 o'clock dispersion curve and coupling impedance performance plot at diameter/period ratio;
Figure 11 is that the present invention is the dispersion curve figure of 0.3 o'clock minimum quadravalence mould field at diameter/period ratio.
Embodiment
As shown in Figure 1 and Figure 2, periodical slow wave structure for 2-D electromagnetic belt gap plane crossing wave guide of the present invention comprises metal electro-magnetic bandgap waveguiding structure, the electro-magnetic bandgap waveguiding structure is provided with input port 1 and output port 2, the electro-magnetic bandgap waveguiding structure comprises cavity 5, be provided with metal partion (metp) 6, electronics notes passage 4 and metal column 31 in cavity 5, the waveguide shapes of electro-magnetic bandgap waveguiding structure is the S type.Electronics inlet 41 and electronics that cavity 5 is provided with electronics notes passage 4 outpour mouth 42, are provided with window 61 and electromagnetic wave passage 62 on metal partion (metp) 6.
During work, electromagnetic wave enters into plane one from input port 1, transmits along EBG waveguide electromagnetic wave passage 62, enters into plane two along the window 61 between plane one and the plane two again, the window 61 double windows of doing electromagnetic wave passage and electronics notes passage.By that analogy, electromagnetic wave is finally in output port 2 outputs.Like this, electromagnetic wave forms slow wave on the direction of propagation of electronics notes passage 4, and electromagnetic wave and electronics are annotated in electronics notes passage 4 and carried out effective energy exchange, thereby realizes the mutual effect of ripple notes.
Fig. 3 is the waveguide type electromagnetic bandgap structure two-dimensional structure schematic diagram that the present invention adopts, and the definition metal lattice cycle is Λ, and the metal column diameter is d.Can clearly be seen that the S type that is shaped as of the metal electro-magnetic bandgap waveguide that the present invention adopts.
The circuit that Fig. 4 illustrates S type EBG of the present invention waveguide forms schematic diagram.In the present embodiment, it is arranged evenly that each circle metal column is pressed regular hexagon.Set the drift angle (metal column A) of starting point, removes metal column on the limit (three metal column A, B, C comprise orthohexagonal two summits), remove a metal column D who follows on the limit again at second circle (a middle circle) metal column.Then remove in first lap (inner ring) metal column and the immediate metal column E of metal column D, and the line between the line of metal column D and metal column E and metal column C and the metal column D constitutes the angles of 120 degree.Remove the metal column F (hollow passageway of formation is that electronics is annotated passage) in bosom, along metal column E and metal column F line, remove metal column G, remove the metal column H (line between the line of metal column G and metal column H and metal column F and the metal column G constitutes the angle of 120 degree) that is arranged in the second circle metal column again, remove the metal column I (line between the line of metal column H and metal column I and metal column G and the metal column H constitutes the angle of 120 degree) that is positioned at second circle equally again, with metal column I is the summit, removal is arranged in a limit (three metal column I of the second circle metal column, J, K), space behind removal metal column A～K has formed S type passage like this, has just constituted S shape EBG waveguide.
Band gap zoning schematic diagram when Fig. 5 has provided d=0.6 Λ, its lattice vector is Γ M, Γ K, angle becomes 60 degree, stain is represented metal cylinder, complete EBG structure has 5 row's metal columns along Γ M direction, but a row metal column is removed along Γ K direction in the middle of when constituting waveguide, so identifies 4 row's metal columns among the figure altogether.
Fig. 6 has provided the band gap diagram of the electromagnetic bandgap structure of the present invention's employing.
By Fig. 7, Fig. 8 as seen, mould of the present invention field has kept good unimodular property.
Fig. 9, Figure 10 have provided diameter/period ratio and be respectively 0.3,0.6 o'clock, the basic mode dispersion characteristics of this structure and coupling impedance characteristic.As can be seen, its bandwidth is narrower, but coupling impedance is very high.Be that the coupling impedance minimum can reach 544 Ω, compares with traditional coupled structure under 0.6 the situation at diameter/period ratio shown in Figure 10, coupling impedance is greatly improved.Meanwhile, the different mode of this structure on cross section, remains unimodular property on the direction vertical with the duct propagation direction.Therefore, all patterns of this structure may be used to ripple and annotate coupling, and this can increase the frequency range of its application.It is 0.3 o'clock slow wave structure of the present invention minimum four pattern (dispersion curves of Mode1～Mode4) that Figure 11 has provided diameter/period ratio.
Claims (1)
1. periodical slow wave structure for 2-D electromagnetic belt gap plane crossing wave guide, comprise metal electro-magnetic bandgap waveguiding structure, described electro-magnetic bandgap waveguiding structure is provided with input port (1) and output port (2), described electro-magnetic bandgap waveguiding structure comprises cavity (5), be provided with metal partion (metp) (6), electronics notes passage (4) and metal column (31) in cavity (5), the waveguide shapes that it is characterized in that described electro-magnetic bandgap waveguiding structure is the S type; Electronics inlet (41) and electronics that described cavity (5) is provided with electronics notes passages (4) outpour mouthful (42), are provided with window (61) and electromagnetic wave passage (62) on metal partion (metp) (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100196581A CN101242019B (en) | 2008-03-11 | 2008-03-11 | Periodical slow wave structure for 2-D electromagnetic belt gap plane crossing wave guide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100196581A CN101242019B (en) | 2008-03-11 | 2008-03-11 | Periodical slow wave structure for 2-D electromagnetic belt gap plane crossing wave guide |
Publications (2)
| Publication Number | Publication Date |
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| CN101242019A CN101242019A (en) | 2008-08-13 |
| CN101242019B true CN101242019B (en) | 2010-07-28 |
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| CN2008100196581A Expired - Fee Related CN101242019B (en) | 2008-03-11 | 2008-03-11 | Periodical slow wave structure for 2-D electromagnetic belt gap plane crossing wave guide |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101938023B (en) * | 2010-07-13 | 2013-06-05 | 东南大学 | Bragg rectangular two-dimensional electromagnetic band gap (EBG) high-impedance backboard plane structure |
| CN108054523B (en) * | 2017-10-31 | 2023-07-11 | 安徽四创电子股份有限公司 | Frequency scanning phased array antenna |
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