CN204257794U - A kind of ultra broadband artificial surface plasmon curved waveguide - Google Patents
A kind of ultra broadband artificial surface plasmon curved waveguide Download PDFInfo
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- CN204257794U CN204257794U CN201420736683.2U CN201420736683U CN204257794U CN 204257794 U CN204257794 U CN 204257794U CN 201420736683 U CN201420736683 U CN 201420736683U CN 204257794 U CN204257794 U CN 204257794U
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Abstract
The utility model discloses a kind of ultra broadband artificial surface plasmon curved waveguide, forms primarily of medium substrate layer and metal foil layer.Medium substrate layer and metal foil layer are angle block of right angle, and metal foil layer is printed on the wherein side of medium substrate on the surface.The surface etching of metal foil layer has waveguiding structure, and the trend of waveguiding structure is consistent with the center line of metal foil layer.Waveguiding structure includes surface plasmons curved waveguide part, 2 conversion portions and 2 co-planar waveguide part compositions.First co-planar waveguide part is connected through the first conversion portion one end with surface plasmons curved waveguide part, and the other end of surface plasmons curved waveguide part is walked around through second and is partly connected with the second co-planar waveguide part.The utility model can not only realize the bending transmission of artificial surface plasmon, and effectively can reduce dielectric loss.
Description
Technical field
The utility model belongs to artificial surface plasmon technical field, is specifically related to a kind of ultra broadband artificial surface plasmon curved waveguide.
Background technology
Artificial surface plasmon is a kind of mode of electromagnetic wave being constrained on manual electromagnetic structure surface and carrying out propagating, and it is a kind of surface electromagnetic wave in essence; Because surface plasmons is not by the restriction of diffraction limit, so can be used for constructing miniaturized device, in Surface wave technology, integrated circuit fields and the telecommunication circuit in future, there is important application; At present, research for artificial surface plasmon is only in the stage analyzed the characteristic of artificial surface plasmon, and the artificial surface plasmon waveguide that system is complete, especially effectively encourage in conjunction with feeder equipment and realize artificial surface plasmon and bend the waveguiding structure of transmission there is not been reported, this is very big limit artificial surface plasma (as artificial surface plasmon must be carried out bending transmission environment under) application.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of ultra broadband artificial surface plasmon curved waveguide, and it can not only realize the bending transmission of artificial surface plasmon, and effectively can reduce dielectric loss.
For solving the problem, the utility model is achieved through the following technical solutions:
A kind of ultra broadband artificial surface plasmon curved waveguide, is formed primarily of medium substrate layer and metal foil layer.Medium substrate layer and metal foil layer are angle block of right angle, and metal foil layer is printed on the wherein side of medium substrate on the surface.The surface etching of metal foil layer has waveguiding structure, and the trend of waveguiding structure is consistent with the center line of metal foil layer.
Above-mentioned waveguiding structure includes surface plasmons curved waveguide part, 2 conversion portions and 2 co-planar waveguide part compositions.First co-planar waveguide part is connected through the first conversion portion one end with surface plasmons curved waveguide part, and the other end of surface plasmons curved waveguide part is walked around through second and is partly connected with the second co-planar waveguide part.
Each co-planar waveguide part includes 1 center conduction band and is positioned at the coplanar line of rabbet joint that 2 of conduction band both sides, center do not wait width.The trend of center conduction band and 2 coplanar line of rabbet joint all with the centerline parallel of metal foil layer, and three all extends to conversion portion.
Each conversion portion includes air bridges, disk Ba Lun, the impedance transformation line of rabbet joint and transition.Air bridges is the metal conduction band of suspended span on 2 coplanar line of rabbet joint, and the two ends of air bridges respectively the line of rabbet joint coplanar with first be connected with the metal foil layer on the second coplanar line of rabbet joint both sides.Disk Ba Lun is connected with the first coplanar line of rabbet joint.The trend of the impedance transformation line of rabbet joint and the centerline parallel of metal foil layer, and the line of rabbet joint width of the impedance transformation line of rabbet joint is increased to surface plasmons curved waveguide part side, side gradually by co-planar waveguide part.One end of the impedance transformation line of rabbet joint is connected with the second coplanar line of rabbet joint, and the other end is connected with one end of transition.Transition is directly to the bilateral comb teeth-shaped metal grating structure extended.The comb width of transition is consistent.The comb length of transition and the depth of groove of comb, increased to surface plasmons curved waveguide part side, side gradually by co-planar waveguide part.The other end of transition is connected with straight wave guide section.
Surface plasmons curved waveguide part comprises waveguide bend section and 2 straight wave guide sections.2 straight wave guide sections are directly to the bilateral comb teeth-shaped metal grating structure extended, and waveguide bend section is for bending to the bilateral comb teeth-shaped metal grating structure at right angle, and 2 straight wave guide sections are connected to the two ends of waveguide bend section.The comb width of straight wave guide section and waveguide bend section is consistent, and the comb length i.e. depth of groove of two comb is all identical.
In such scheme, the width of the described first coplanar line of rabbet joint is greater than the width of the second coplanar line of rabbet joint.
In such scheme, the distance between two comb of described transition and the groove period of comb consistent.
In such scheme, the distance between straight wave guide section and two comb of waveguide bend section and the groove period of comb consistent.
In such scheme, transition, straight wave guide section are all identical with the width of each comb of waveguide bend section.
In such scheme, by co-planar waveguide part side to surface plasmons curved waveguide part side, the line of rabbet joint width of the impedance transformation line of rabbet joint is that staged increases gradually.
Compared with prior art, the utility model has following features:
1. by designing the special construction of co-planar waveguide part, conversion portion and surface plasmons curved waveguide part, make the utility model electromagnetic wave can be constrained in tightly body structure surface to propagate, thus reduce bending radiation loss, in very wide frequency band, all achieve the bending transmission of greater efficiency.
2. whole waveguiding structure of the present utility model is in the same side of medium substrate, medium substrate of the present utility model can be accomplished infinitely thin, and this waveguiding structure can be printed on flexible media film, even can be conformal on other structural objects, thus effective dielectric loss reducing electromagnetic wave and bring at transmitting procedure medium substrate.
3. the utility model achieves the mutual conversion of guided wave in broadband in asymmetric coplanar wave-guides and artificial surface plasmon, and have structure simple, be easy to realize and processing, bandwidth, all has higher efficiency of transmission in whole passband.
4. suitably scaled down is carried out to the utility model, utility model works can also be made in different frequency ranges, as millimeter wave and Terahertz frequency range.
Accompanying drawing explanation
Fig. 1 is a kind of overall structure schematic diagram of ultra broadband artificial surface plasmon curved waveguide;
Fig. 2 is the enlarged diagram of conversion portion and straight wave guide section in Fig. 1;
Fig. 3 is the three-dimensional enlarged diagram of air bridges in Fig. 1;
Fig. 4 is the enlarged diagram of waveguide sweep in Fig. 1;
Fig. 5 (a) and (b) are respectively the distribution map of the electric field of even mould in asymmetric coplanar wave-guides and Qi Mo;
Fig. 6 is experimental data figure of the present utility model;
Number in the figure: 1, medium substrate layer; 2, metal foil layer; 3, waveguiding structure; 31, co-planar waveguide part; 311, center conduction band; 312, the coplanar line of rabbet joint; 32, conversion portion; 321, air bridges; 322, disk Ba Lun; 323, the impedance transformation line of rabbet joint; 324, transition; 33, surface plasmons curved waveguide part; 331, waveguide bend section; 332, straight wave guide section.
Embodiment
A kind of ultra broadband artificial surface plasmon curved waveguide, as shown in Figure 1, is formed primarily of medium substrate layer and metal foil layer 2.Medium substrate layer and all L-shaped angle block of right angle of metal foil layer 2, metal foil layer 2 is printed on the wherein side of medium substrate on the surface.The surface etching of metal foil layer 2 has waveguiding structure 3, and the trend of waveguiding structure 3 is consistent with the center line of metal foil layer 2.Described medium substrate layer and metal foil layer 2 can be the copper-clad plates that electricity field is conventional.Also metal foil layer 2 can be printed on flexible medium substrate.Even can metal foil layer 2 be directly printed on other structural objects, namely with other structural objects common media substrates.
Above-mentioned waveguiding structure 3 includes surface plasmons curved waveguide part 33,2 conversion portions 32 and 2 co-planar waveguide parts 31 form.First co-planar waveguide part 31 is connected through the first conversion portion 32 one end with surface plasmons curved waveguide part 33, and the other end of surface plasmons curved waveguide part 33 is walked around through second and is partly connected with the second co-planar waveguide part 31.Co-planar waveguide to the transformational structure of surface plasmons as the structure connecting co-planar waveguide and the waveguide of artificial surface plasmon, be provided with two, the top being arranged in structure completes and converts the electromagnetic wave of co-planar waveguide to artificial surface plasmon coupling input, and another completes artificial surface plasmon at the end of structure and is converted to electromagnetic wave coupling output in co-planar waveguide.
Each co-planar waveguide part 31 includes 1 center conduction band 311 and is positioned at 2 coplanar line of rabbet joint 312 (the first coplanar line of rabbet joint 312 and the second coplanar line of rabbet joint 312) of center conduction band 311 both sides.The centerline parallel of the coplanar line of rabbet joint 312 of center conduction band 311, first and the second coplanar line of rabbet joint 312 and metal foil layer 2, and three all extends to conversion portion 32.The first coplanar line of rabbet joint 312 is different with the line of rabbet joint width of the second coplanar line of rabbet joint 312, and the width of the first coplanar line of rabbet joint 312 is greater than the width of the second coplanar line of rabbet joint 312, i.e. g1 > g2.Two line of rabbet joint width of co-planar waveguide part 31 and the width on two floors can be unequal, had more adjustable structural parameters, this waveguiding structure 3 is used more flexible compared to traditional symmetrical co-planar waveguide.Asymmetric due to asymmetric coplanar wave-guides structure 3, cause the earth potential of both sides unequal, can cause the generation of line of rabbet joint pattern (strange mould), as shown in Fig. 5 (b), strange mould is a kind of high impedance mode of parasitism, be unfavorable for the design that device resistance is mated, need to suppress, described air bridges 321 connects the ground on both sides, keeps the consistent of both sides earth potential, serve the effect suppressing strange mould, under making asymmetric coplanar wave-guides be operated in even mould state shown in Fig. 5 (a).
Each conversion portion 32 includes air bridges 321, disk Ba Lun 322, the impedance transformation line of rabbet joint 323 and transition 324, see Fig. 2.
Air bridges 321 suspended span is on center conduction band 311 and 2 coplanar line of rabbet joint 312, and the two ends of air bridges 321 are connected, see Fig. 3 with the ground wire on co-planar waveguide both sides and metal foil layer 2 respectively.Air bridges 321 is made up of the short circuit metal line of the ground wire on both sides, and Bu Yu center conduction band 311 contacts, and inhibits the strange mould in asymmetric coplanar wave-guides.
Disk Ba Lun 322 is rounded poroid, and it is connected with the first coplanar line of rabbet joint 312.Disk balances a line of rabbet joint in asymmetric coplanar wave-guides in the transfer process of asymmetric coplanar wave-guides to the line of rabbet joint, serves the effect of balance Ba Lun.
The trend of the impedance transformation line of rabbet joint 323 and the centerline parallel of metal foil layer 2, and the line of rabbet joint width of the impedance transformation line of rabbet joint 323 is increased to surface plasmons curved waveguide part 33 side, side gradually by co-planar waveguide part 31, i.e. w1 > w2.By co-planar waveguide part 31 side to surface plasmons curved waveguide part 33 side, the line of rabbet joint width of the described impedance transformation line of rabbet joint 323 can be that gradual change type or staged increase gradually.In the present embodiment, the impedance transformation line of rabbet joint 323 is provided with the impedance transformation line of rabbet joint 323 that three sections of line of rabbet joint width gradually change.One end of the impedance transformation line of rabbet joint 323 is connected with the second coplanar line of rabbet joint 312, and the other end is connected with one end of transition 324.The line of rabbet joint of step impedance conversion completes the impedance transformation between the line of rabbet joint in asymmetric coplanar wave-guides and the line of rabbet joint of bilateral metal grating composition, and the impedance matching achieved in broadband reduces electromagnetic reflection.
Transition 324 is directly to the bilateral comb teeth-shaped metal grating structure extended.One end of transition 324 connects with the impedance transformation line of rabbet joint 323, and the other end is connected with straight wave guide section 332.The width a of each comb of transition 324 is consistent.The comb length of transition 324 and the depth of groove of comb, increased to surface plasmons curved waveguide part 33 side, side gradually by co-planar waveguide part 31, i.e. h3 > h2 > h1.The groove period d of the distance between the comb of transition 324 and comb is consistent.The recess region of the described gradual change degree of depth and transition 324, increase from leaving co-planar waveguide gradually to artificial surface plasmon wave guide direction depth of groove, and groove width, cycle are identical with the groove width cycle of double grating, completes wave vector coupling.Electromagnetic wave in the line of rabbet joint is fast wave, and surface plasmons is slow wave, can because wave vector mismatch reduce conversion efficiency when electromagnetic wave direct-drive surface plasmons in the line of rabbet joint, the groove of the gradual change degree of depth achieves wave vector coupling, improves the conversion efficiency of conversion equipment.
Excimer curved waveguide part 33 comprises waveguide bend section 331 and 2 straight wave guide sections 332.2 straight wave guide sections 332 are directly to the bilateral comb teeth-shaped metal grating structure extended, and waveguide bend section 331 is for bending to the bilateral comb teeth-shaped metal grating structure at right angle, and 2 straight wave guide sections 332 are connected to the two ends of waveguide bend section 331.The width a of each comb of waveguide bend section 331 and straight wave guide section 332 is consistent, and identical with the width a of each comb of transition 324.Straight wave guide section 332 and the comb length of waveguide bend section 331 and the depth of groove of comb all identical, and the groove period of distance between comb and comb is consistent.Curved waveguide works in microwave frequency band, can be implemented in the transmission realizing artificial surface plasmon in very wide frequency band after the geometric parameter of optimum option dependency structure.Described surface plasmons curved waveguide part 33 adopts can the two panels metal grating of periodic grooves formation bigrating structures staggered relatively, and this double grating 90-degree bent is achieved the bending transmission of artificial surface plasmon.In the present embodiment, waveguide bend section 331 has the groove of 10 same period parameters, and each groove rotates a certain angle one by one, finally reaches 90 ° bending, and then achieves the bending transmission guiding artificial surface plasmons.
The utility model can, by regulating the parameter of waveguide geometry structure, make it be operated in different frequency ranges, and these parameters comprise the degree of depth of periodic grooves, width and cycle.The number of the width of the ladder line of rabbet joint, length and the ladder line of rabbet joint.The degree of depth, the number of gradual change aperiodic depth recess.The height of air bridges 321 and width.The radius of disk.The length of asymmetric coplanar wave-guides and two grooves groove width separately.
Parameter as shown in Figure 2, Figure 3, Figure 4, through preference data, design parameter is as follows: r
1=5mm, g
3=1mm, g
1=0.2mm, g
2=0.6mm, b
1=1.5mm, b
2=2mm, t
1=0.8mm, w
1=1.5mm, w
2=0.7mm, d=5.5mm, a=1mm, h
1=0.4mm, h
2=2.38mm, h
3=4.7mm, h=6.5mm, R
2=31.5mm.
This waveguide forms a concrete function element in conjunction with opposite side double grating, and by emulation and experiment test in kind, as shown in Figure 6, demonstrating waveguide of the present utility model can ultra broadband, the artificial surface plasmons of high efficiency transmission.
In the utility model, metal adopts low-cost copper at microwave frequency band.
Depth of groove h in the utility model in bilateral metal grating can transmit the electromagnetic wave of different frequency bands when getting different values, and at this time we only need regulate when the width of the line of rabbet joint of the number of aperiodicity groove, the degree of depth and step conversion, length and number and still can reach good conversion effect.
In a word, the utility model electromagnetic wave that can realize in co-planar waveguide in very wide frequency band effectively encourages artificial surface plasmon, and bends the artificial surface plasmons of transmission efficiently, has good propagation characteristic and standing-wave ratio in band.Product is easily processed, and low price, can engineering demand be adapted to a great extent.
Claims (6)
1. a ultra broadband artificial surface plasmon curved waveguide, is characterized in that: form primarily of medium substrate layer and metal foil layer (2); Medium substrate layer and metal foil layer (2) are angle block of right angle, and metal foil layer (2) is printed on the wherein side of medium substrate on the surface; The surface etching of metal foil layer (2) has waveguiding structure (3), and the trend of waveguiding structure (3) is consistent with the center line of metal foil layer (2);
Above-mentioned waveguiding structure (3) includes surface plasmons curved waveguide part (33), 2 conversion portions (32) and 2 co-planar waveguide part (31) compositions; First co-planar waveguide part (31) is connected through the first conversion portion (32) one end with surface plasmons curved waveguide part (33), and the other end of surface plasmons curved waveguide part (33) is walked around through second and is partly connected with the second co-planar waveguide part (31);
Each co-planar waveguide part (31) includes 1 center conduction band (311) and is positioned at the coplanar line of rabbet joint (312) of 2 of center conduction band (311) the both sides width such as not; The trend of center conduction band (311) and 2 coplanar line of rabbet joint (312) all with the centerline parallel of metal foil layer (2), and three all extends to conversion portion (32);
Each conversion portion (32) includes air bridges (321), disk Ba Lun (322), the impedance transformation line of rabbet joint (323) and transition (324); Air bridges (321) is the metal conduction band of suspended span on 2 coplanar line of rabbet joint (312), and the two ends of air bridges (321) respectively the line of rabbet joint (312) coplanar with first be connected with the metal foil layer (2) on the second coplanar line of rabbet joint (312) both sides; Disk Ba Lun (322) is connected with the first coplanar line of rabbet joint (312); The trend of the impedance transformation line of rabbet joint (323) and the centerline parallel of metal foil layer (2), and the line of rabbet joint width of the impedance transformation line of rabbet joint (323) is increased to surface plasmons curved waveguide part (33) side, side gradually by co-planar waveguide part (31); One end of the impedance transformation line of rabbet joint (323) is connected with the second coplanar line of rabbet joint (312), and the other end is connected with the one end of transition (324); Transition (324) is directly to the bilateral comb teeth-shaped metal grating structure extended; The comb width of transition (324) is consistent; The comb length of transition (324) and the depth of groove of comb, increased to surface plasmons curved waveguide part (33) side, side gradually by co-planar waveguide part (31); The other end of transition (324) is connected with straight wave guide section (332);
Surface plasmons curved waveguide part (33) comprises waveguide bend section (331) and 2 straight wave guide sections (332); 2 straight wave guide sections (332) are directly to the bilateral comb teeth-shaped metal grating structure extended, waveguide bend section (331) is for bending to the bilateral comb teeth-shaped metal grating structure at right angle, and 2 straight wave guide sections (332) are connected to the two ends of waveguide bend section (331); The comb width of straight wave guide section (332) and waveguide bend section (331) is consistent, and the comb length i.e. depth of groove of two comb is all identical.
2. a kind of ultra broadband artificial surface plasmon curved waveguide according to claim 1, is characterized in that: the width of the first coplanar line of rabbet joint (312) is greater than the width of the second coplanar line of rabbet joint (312).
3. a kind of ultra broadband artificial surface plasmon curved waveguide according to claim 1, is characterized in that: the distance between two comb of transition (324) and the groove period of comb consistent.
4. a kind of ultra broadband artificial surface plasmon curved waveguide according to claim 1, is characterized in that: the distance between two comb of straight wave guide section (332) and waveguide bend section (331) and the groove period of comb consistent.
5. a kind of ultra broadband artificial surface plasmon curved waveguide according to claim 1, is characterized in that: transition (324), straight wave guide section (332) are all identical with the width of each comb of waveguide bend section (331).
6. a kind of ultra broadband artificial surface plasmon curved waveguide according to claim 1, it is characterized in that: by co-planar waveguide part (31) side to surface plasmons curved waveguide part (33) side, the line of rabbet joint width of the impedance transformation line of rabbet joint (323) is that staged increases gradually.
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| CN106785265A (en) * | 2017-01-04 | 2017-05-31 | 梧州学院 | It is a kind of that there are 90 degree of microwave filters of bent angle |
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| CN106602231A (en) * | 2016-11-16 | 2017-04-26 | 中国人民解放军空军工程大学 | Quasi-surface plasmon ultra-wide band low-scattering slot antenna |
| CN106505286B (en) * | 2016-11-21 | 2019-02-15 | 电子科技大学 | A kind of ultra wide band parting structure artificial surface plasmon power splitter |
| CN106505286A (en) * | 2016-11-21 | 2017-03-15 | 电子科技大学 | A kind of ultra broadband parting structure artificial surface plasmon power splitter |
| CN106532205A (en) * | 2017-01-04 | 2017-03-22 | 梧州学院 | Bending type microwave band-pass filter |
| CN106785265A (en) * | 2017-01-04 | 2017-05-31 | 梧州学院 | It is a kind of that there are 90 degree of microwave filters of bent angle |
| CN107069153A (en) * | 2017-04-12 | 2017-08-18 | 北京大学 | One kind is based on surface plasmons waveguide bend mode converter and its implementation |
| CN108493527A (en) * | 2018-05-09 | 2018-09-04 | 桂林电子科技大学 | One kind embedding rectangular cavity plasma wave-filter based on MIM waveguides |
| CN109768384A (en) * | 2019-01-23 | 2019-05-17 | 西安电子科技大学 | Based on odd mould artificial surface phasmon broadband end-on-fire antenna, wireless communication system |
| CN109768384B (en) * | 2019-01-23 | 2020-10-16 | 西安电子科技大学 | Odd-mode artificial surface plasmon based broadband end-fire antenna and wireless communication system |
| CN111180845A (en) * | 2020-01-06 | 2020-05-19 | 东南大学 | Device for jointly transmitting artificial surface plasmon fundamental mode and high-order mode |
| CN111180845B (en) * | 2020-01-06 | 2021-07-27 | 东南大学 | Device for jointly transmitting artificial surface plasmon fundamental mode and high-order mode |
| CN111261983A (en) * | 2020-01-16 | 2020-06-09 | 北京环境特性研究所 | Closed periodic metal grating SSP terahertz filter and tuning method |
| CN111261983B (en) * | 2020-01-16 | 2021-03-23 | 北京环境特性研究所 | Closed periodic metal grating SSP terahertz filter and tuning method |
| CN114156615A (en) * | 2021-10-29 | 2022-03-08 | 杭州电子科技大学 | Foldable artificial surface plasmon low-pass filter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150408 Effective date of abandoning: 20170201 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |