CN102956950B - Metamaterial-based directional coupler - Google Patents
Metamaterial-based directional coupler Download PDFInfo
- Publication number
- CN102956950B CN102956950B CN201110254553.6A CN201110254553A CN102956950B CN 102956950 B CN102956950 B CN 102956950B CN 201110254553 A CN201110254553 A CN 201110254553A CN 102956950 B CN102956950 B CN 102956950B
- Authority
- CN
- China
- Prior art keywords
- metamaterial
- unit
- sheet
- refractive index
- aperture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention relates to the field of radio frequency and microwave signal transmission and provides a metamaterial-based directional coupler. The directional coupler comprises an input end, an output end, a coupling end and a coupling module, wherein the coupling module is connected with the input end, the output end and the coupling end respectively; the coupling module is formed by stacking a plurality of metamaterial panels with the same refractive index distribution; each metamaterial panel comprises a plurality of metamaterial sheet layers; each metamaterial sheet layer comprises a plurality of metamaterial units; and each metamaterial unit comprises a unit substrate provided with one or a plurality of holes. The directional coupler has the beneficial effects that the directional coupler adopts the metamaterial technology, and by changing refractive index distribution inside the metamaterial, the directional coupler has the characteristics of high directionality, good coupling flatness, high loading power, capability of achieving multidirectional coupling, small volume and convenience in installation and use.
Description
Technical field
The present invention relates to radio frequency and microwave signal transmission technical field, more particularly, relate to a kind of directional coupler based on Meta Materials.
Background technology
Directional coupler is a kind of general microwave or millimeter wave component, may be used for the isolation of signal, separation and mixing, as the sweep check etc. of the monitoring of power, source power output fixed ampllitude, signal source isolation, transmission and reflection.High performance directional coupler wants that cube is little, little to the loss of signal transmission, the flatness of coupled signal and directivity will be got well, the degree of coupling and standing-wave ratio are also wanted relatively good and will have enough power capacities.
Existing directional coupler is mostly microstrip coupler, and because microstrip directional coupler is by the narrow limit coupling of major-minor microstrip line, be coupled very weak, coupled section length hour cannot realize stronger coupling.The length of coupled striplines be generally operating frequency wavelength 10% ~ 25% between.In HF and VHF frequency range, directional coupler operation wavelength is rice magnitude, and calculate according to 10% wavelength, coupled section length is also at decimeter level, and thus the size lossy of directional coupler is large.Especially, when the degree of coupling of directional coupler requires more weak (as 40dB), the directivity of microstrip directional coupler is difficult to reach instructions for use.
Summary of the invention
The object of the invention is to overcome the degree of coupling of coupler in prior art and depend on the length of coupled section, the defect such as directivity is bad, insertion loss is large, there is provided a kind of directional coupler based on Meta Materials, described coupler has that directivity is high, Coupling flatness good, load power is large, can also realize multidirectional coupling and the little feature being convenient to install and use of volume.
In order to achieve the above object, the following technical scheme of the present invention's employing:
A kind of directional coupler based on Meta Materials, described directional coupler comprises input, output and coupled end, described directional coupler also comprises a coupling module, wherein, described coupling module respectively with described input, output and coupled end are connected, described coupling module forms by multiple metamaterial panel with identical refraction index profile is stacking, each metamaterial panel described is made up of multiple metamaterial sheet, each metamaterial sheet described is made up of multiple metamaterial unit, described metamaterial unit comprises the unit base material being provided with one or more aperture.
Further, the refractive index of each metamaterial sheet in each metamaterial panel described is all not identical, but the refraction index profile of each metamaterial sheet inside is uniform.
Further, the refraction index profile situation of each metamaterial sheet in each metamaterial panel described is: in the multiple metamaterial sheet be stacked, the refractive index of the metamaterial sheet of bottom is minimum, and increase gradually along with stacking height, the refractive index of metamaterial sheet also increases gradually.
Further, each metamaterial unit described is formed with an aperture, the medium that refractive index is less than unit base material refractive index is filled with in described aperture, and the aperture in all metamaterial unit all fills the medium of same material, described be arranged on small pore volume in metamaterial unit in each metamaterial panel each metamaterial sheet arrangement rule be: in the multiple metamaterial sheet be stacked, the small pore volume that the metamaterial sheet of bottom is formed in described metamaterial unit is minimum, and increase gradually along with stacking height, the small pore volume that metamaterial sheet is formed in described metamaterial unit also increases gradually.Further, the medium of filling in described aperture is air.
Further, each metamaterial unit described is formed with an aperture, the medium that refractive index is greater than unit base material refractive index is filled with in described aperture, and the aperture in all metamaterial unit all fills the medium of same material, described be arranged on small pore volume in metamaterial unit in each metamaterial panel each metamaterial sheet arrangement rule be: in the multiple metamaterial sheet be stacked, the small pore volume that the metamaterial sheet of bottom is formed in described metamaterial unit is maximum, and increase gradually along with stacking height, the small pore volume that metamaterial sheet is formed in described metamaterial unit also reduces gradually.
Further, described metamaterial unit is formed with quantity difference, the aperture that volume is identical, the medium that refractive index is less than unit base material refractive index is filled with in described aperture, and the aperture in all metamaterial unit all fills the medium of same material, described be arranged on little hole number in metamaterial unit in each metamaterial panel each metamaterial sheet arrangement rule be: in the multiple metamaterial sheet be stacked, the little hole number that the metamaterial sheet of bottom is formed in described metamaterial unit is maximum, and increase gradually along with stacking height, the little hole number that metamaterial sheet is formed in described metamaterial unit also increases gradually.
Further, described metamaterial unit is formed with quantity difference, the aperture that volume is identical, the medium that refractive index is greater than unit base material refractive index is filled with in described aperture, and the aperture in all metamaterial unit all fills the medium of same material, described be arranged on little hole number in metamaterial unit in each metamaterial panel each metamaterial sheet arrangement rule be: in the multiple metamaterial sheet be stacked, the little hole number that the metamaterial sheet of bottom is formed in described metamaterial unit is minimum, and increase gradually along with stacking height, the little hole number that metamaterial sheet is formed in described metamaterial unit also reduces gradually.
Further, the refractive index of described multiple metamaterial panel along with the distribution situation of the change of ordinate y is: set up coordinate system with the multiple metamaterial panel be stacked, lowermost layer coordinate y=0,
Wherein, n
minrepresent the refractive index value of bottom metamaterial sheet in each metamaterial panel; n
maxrepresent the refractive index value of the superiors' metamaterial sheet in each metamaterial panel; P represents the height of each metamaterial panel; A represents the number of plies of metamaterial panel, along with the number of plies of metamaterial panel increases, a gets 1 successively, 2,3,4 ... wherein a=1 represents bottom metamaterial panel; Refractive index when n (y) represents that ordinate is y.
The present invention, relative to prior art, has following beneficial effect:
1, by regulating the refraction index profile situation of the inner Meta Materials of coupling module, effectively regulating the degree of coupling of directional coupler, improving its directivity.
2, signal to be transmitted is by after coupling module of the present invention, due to the physical parameter of the Meta Materials inside of coupling module, namely dielectric constant and magnetic permeability can regulate arbitrarily according to concrete needs, thus make signal to be transmitted that a part of signal is coupled to coupled end accurately to carry out separated transmission.
3, the length of coupling module can regulate according to actual needs, is no longer subject to the restriction of electromagnetic wavelength, and the volume of coupler is reduced, cost-saving.
4, the directional coupler that the present invention is based on Meta Materials can be coupled multiple signals simultaneously, realizes the function of the multidirectional directional coupler of multichannel.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of directional coupler based on Meta Materials of the present invention;
Fig. 2 is the stacking schematic diagram of multiple metamaterial panel of the present invention;
Fig. 3 is the refraction index profile schematic diagram of multiple metamaterial panel of the present invention;
Fig. 4 is the structural representation of a metamaterial panel of the present invention;
Fig. 5 is the structural representation of metamaterial unit of the present invention;
Fig. 6 is embodiment of the present invention schematic diagram;
Fig. 7 is embodiment of the present invention schematic diagram.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
As shown in Figure 1, a kind of directional coupler based on Meta Materials, described directional coupler comprises input 10, output 30, coupled end 20 and a coupling module 40, wherein, described coupling module 40 is connected with described input 10, output 30 and coupled end 20 respectively, peripheral electromagnetic wave signal inputs after described coupling module 40 from described input 10, part electromagnetic wave signal directly exports from described output 30, and another part electromagnetic wave signal exports after being coupled to described coupled end 20 by described coupling module 40.
As shown in Figure 2, described coupling module 40 comprises multiple metamaterial panel 401, and this multiple metamaterial panel 401 is identical, there is identical refraction index profile rule, namely when electromagnetic wave signal is by after coupling module 40, identical deviation direction can be there is, reach the orientating function of directional coupler.
As shown in Figure 4, each metamaterial panel 401 described comprises multiple metamaterial sheet 411, each metamaterial sheet 411 comprises multiple metamaterial unit 50, but the refraction index profile rule of this multiple metamaterial sheet 411 is different, in preferred embodiment of the present invention, in multiple metamaterial sheet 411 in each metamaterial panel 401, wherein the refractive index of the superiors' metamaterial sheet is maximum, then down refractive index reduces gradually, namely when electromagnetic wave signal is by after this metamaterial panel 401, electromagnetic wave signal can transmit towards the direction that refractive index is larger.
Such as: suppose that a frequency is that the electromagnetic wave signal of 15GHz (wavelength is 2cm) is by a metamaterial panel 401, described metamaterial panel 401 comprises 4 layers of metamaterial sheet 411, wherein the thickness of each metamaterial sheet is 1.3mm, and the variations in refractive index of 4 layers of metamaterial sheet 411 is for change to 1.2 from 5.2.The angle that we can obtain this metamaterial panel 401 pairs of electromagnetic wave signal deviations is like this arcsin [(5.2-1.2)/1.3*4], about 31 degree, so this directional coupler can carry out coupled transfer to the electromagnetic wave signal of 15GHz towards 31 degree of directions.
Why Meta Materials directional coupler of the present invention can directional transmissions electromagnetic wave signal be refraction index profile rule by changing metamaterial panel inside, in the present embodiment, as shown in Figures 2 and 3, the refraction index profile in each metamaterial panel 401 is from the refractive index n of the superiors' metamaterial sheet 411 in it
maxbe reduced to the refractive index n of bottom metamaterial sheet 411 gradually
min, wherein Fig. 2 and 3 gives described coupling module 40 and comprises 3 metamaterial panel 401, each metamaterial panel 401 comprises 5 metamaterial sheet 411, but is confined to this in specific implementation process, can sets itself according to actual needs.
As shown in Figure 5, described metamaterial unit 50 comprises the unit base material 501 being provided with one or more aperture 502, by the density to aperture 502, and size and its design distributed on unit base material 501, the refraction index profile rule of each metamaterial panel 401 is met as shown in Figure 3, provides n
max~ n
minvariations in refractive index figure, but should know that variations in refractive index of the present invention is not as limit.Purpose of design of the present invention is: make electromagnetic wave when each metamaterial panel 401, electromagnetic wave deflection angle is changed gradually.By formula S in θ=q Δ n, wherein θ is the electromagnetic angle of required deviation, Δ n is front and back variations in refractive index differences, and q is the thickness of Meta Materials functional layer and can determines desired parameters value by Computer Simulation and reach purpose of design of the present invention.
For the change making the metamaterial sheet 411 of metamaterial panel 401 realize refractive index shown in Fig. 3, through theoretical and actual proof, can to the density of described aperture 502, size and its design distributed on unit base material 501, unit base material 501 adopts dielectric insulation material to make, can be ceramic material, macromolecular material, ferroelectric material, ferrite material, ferromagnetic material etc., macromolecular material can be such as, epoxy resin or polytetrafluoroethylene.Each metamaterial unit 50 can produce response to by electromagnetic wave wherein, thus affect electromagnetic wave transmission wherein, the size of each metamaterial unit 50 depends on the electromagnetic wave that needs respond, be generally 1/10th of the electromagnetic wavelength of required response, otherwise the arrangement that the metamaterial unit 50 in space forms can not be regarded as in space continuously.
When unit base material 501 selected, effective dielectric constant everywhere and equivalent permeability can be adjusted on Meta Materials by adjusting the density of aperture 502, size and the spatial distribution on unit base material 501 thereof and then changes Meta Materials equivalent refractive index everywhere.
Can filled media in aperture 502, in this better embodiment, the medium of filling in aperture 502 is air, and air refraction must be less than the refractive index of unit base material 501, when aperture 502 volume is larger, the refractive index of the metamaterial unit 50 at aperture 502 place is then less.The volume being arranged on the aperture 502 in metamaterial unit 50 in each metamaterial panel 401 each metamaterial sheet 411 rule of arranging be: in the multiple metamaterial sheet 411 be stacked, aperture 502 volume that the metamaterial sheet 411 of bottom is formed in described metamaterial unit 50 is minimum, and increase gradually along with stacking height, aperture 502 volume that metamaterial sheet 411 is formed in described metamaterial unit 50 also increases gradually.Ground can be imagined, when being filled with refractive index in aperture 502 and being greater than the same media of unit base material 501, then now aperture 502 volume is larger, the refractive index of the metamaterial unit occupied by aperture 502 is also larger, the volume being therefore now arranged on the aperture 502 in metamaterial unit 50 in each metamaterial panel 401 each metamaterial sheet 411 arrange rule by completely contrary with the arrangement rule of filling air in aperture 502.
Another embodiment of the present invention, is with the difference of the first better embodiment, there is the identical aperture of multiple volume 502, can be reduced at technology difficulty unit base material 501 being arranged aperture 502 like this in each metamaterial unit.The place identical with the first better embodiment is, in this better embodiment in each metamaterial unit all apertures to account for the regularity of distribution of the volume of metamaterial unit identical with the first better embodiment, namely two kinds of situations are divided into: when the medium refraction index of filling in (1) all apertures 502 is less than unit base material 501 refractive index, and the aperture 502 in all metamaterial unit all fills the medium of same material, be arranged on little hole number in metamaterial unit in each metamaterial panel 401 each metamaterial sheet 411 rule of arranging be: in the multiple metamaterial sheet be stacked, the little hole number that the metamaterial sheet of bottom is formed in described metamaterial unit is maximum, and increase gradually along with stacking height, the little hole number that metamaterial sheet is formed in described metamaterial unit also increases gradually.This better embodiment is namely this kind of situation and in all apertures 502, filled media is air, (2) when the medium refraction index of filling in all apertures 502 is greater than unit base material 501 refractive index, and the aperture 502 in all metamaterial unit all fills the medium of same material, be arranged on little hole number in metamaterial unit in each metamaterial panel each metamaterial sheet arrangement rule be: in the multiple metamaterial sheet be stacked, the little hole number that the metamaterial sheet of bottom is formed in described metamaterial unit is minimum, and increase gradually along with stacking height, the little hole number that metamaterial sheet is formed in described metamaterial unit also reduces gradually.
The refractive index of multiple metamaterial panel 401 described in the present embodiment along with the distribution situation of the change of ordinate y is: set up coordinate system with the multiple metamaterial panel 401 be stacked as shown in Figure 2, lowermost layer coordinate y=0,
Wherein, n
minrepresent the refractive index value of bottom metamaterial sheet 411 in each metamaterial panel 401; n
maxrepresent the refractive index value of the superiors' metamaterial sheet 411 in each metamaterial panel 401; P represents the height of each metamaterial panel 401; A represents the number of plies of metamaterial panel 401, along with the number of plies of metamaterial panel 401 increases, a gets 1 successively, 2,3,4 ... wherein, a=1 represents bottom metamaterial panel 401; Refractive index when n (y) represents that ordinate is y.
Embodiment 2
As shown in Figure 6, a kind of Meta Materials directional coupler comprises input 10 ', coupling module 40 ', the first coupled end 201, second coupled end 202 and output 30 '.After electromagnetic wave signal enters coupling module 40 ' from input 10 ', a part of electromagnetic wave directly transmits from described output 30 ', and some electromagnetic wave signal enters described first coupled end 201 and the second coupled end 202 after being coupled by coupling module 40 '.The present embodiment and embodiment 1 are distinguished and are mainly that coupling module 40 ' is relatively connected together by the metamaterial panel of two identical refraction index profile, as shown in Figure 7, electromagnetic wave is had and is coupled towards both direction.The metamaterial panel of described relative connection also can be that refractive index is not identical, and this is determined according to practical application.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not run counter to Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (8)
1. the directional coupler based on Meta Materials, described directional coupler comprises input, output and coupled end, it is characterized in that, described directional coupler also comprises a coupling module, wherein, described coupling module respectively with described input, output and coupled end are connected, described coupling module forms by multiple metamaterial panel with identical refraction index profile is stacking, each metamaterial panel described is made up of multiple metamaterial sheet, each metamaterial sheet described is made up of multiple metamaterial unit, described metamaterial unit comprises the unit base material being provided with one or more aperture,
The refractive index of each metamaterial sheet in each metamaterial panel described is all not identical, but the refraction index profile of each metamaterial sheet inside is uniform;
The refraction index profile situation of each metamaterial sheet in each metamaterial panel described is: in the multiple metamaterial sheet be stacked, the refractive index of the metamaterial sheet of bottom is minimum, and increase gradually along with stacking height, the refractive index of metamaterial sheet also increases gradually.
2. a kind of directional coupler based on Meta Materials according to claim 1, it is characterized in that: each metamaterial unit described is formed with an aperture, the medium that refractive index is less than unit base material refractive index is filled with in described aperture, and the aperture in all metamaterial unit all fills the medium of same material, described each metamaterial sheet arrangement rule of small pore volume in each metamaterial panel be arranged in metamaterial unit is: in the multiple metamaterial sheet be stacked, the small pore volume that the metamaterial sheet of bottom is formed in described metamaterial unit is minimum, and increase gradually along with stacking height, the small pore volume that metamaterial sheet is formed in described metamaterial unit also increases gradually.
3. a kind of directional coupler based on Meta Materials according to claim 2, is characterized in that: the medium of filling in described aperture is air.
4. a kind of directional coupler based on Meta Materials according to claim 1, it is characterized in that: each metamaterial unit described is formed with an aperture, the medium that refractive index is greater than unit base material refractive index is filled with in described aperture, and the aperture in all metamaterial unit all fills the medium of same material, described each metamaterial sheet arrangement rule of small pore volume in each metamaterial panel be arranged in metamaterial unit is: in the multiple metamaterial sheet be stacked, the small pore volume that the metamaterial sheet of bottom is formed in described metamaterial unit is maximum, and increase gradually along with stacking height, the small pore volume that metamaterial sheet is formed in described metamaterial unit also reduces gradually.
5. a kind of directional coupler based on Meta Materials according to claim 1, it is characterized in that: described metamaterial unit is formed with quantity difference, the aperture that volume is identical, the medium that refractive index is less than unit base material refractive index is filled with in described aperture, and the aperture in all metamaterial unit all fills the medium of same material, described each metamaterial sheet arrangement rule of little hole number in each metamaterial panel be arranged in metamaterial unit is: in the multiple metamaterial sheet be stacked, the little hole number that the metamaterial sheet of bottom is formed in described metamaterial unit is maximum, and increase gradually along with stacking height, the little hole number that metamaterial sheet is formed in described metamaterial unit also increases gradually.
6. a kind of directional coupler based on Meta Materials according to claim 5, is characterized in that: the medium of filling in described aperture is air.
7. a kind of directional coupler based on Meta Materials according to claim 1, it is characterized in that: described metamaterial unit is formed with quantity difference, the aperture that volume is identical, the medium that refractive index is greater than unit base material refractive index is filled with in described aperture, and the aperture in all metamaterial unit all fills the medium of same material, described each metamaterial sheet arrangement rule of little hole number in each metamaterial panel be arranged in metamaterial unit is: in the multiple metamaterial sheet be stacked, the little hole number that the metamaterial sheet of bottom is formed in described metamaterial unit is minimum, and increase gradually along with stacking height, the little hole number that metamaterial sheet is formed in described metamaterial unit also reduces gradually.
8. a kind of directional coupler based on Meta Materials according to claim 1, it is characterized in that, the refractive index of described multiple metamaterial panel along with the distribution situation of the change of ordinate y is: set up coordinate system with the multiple metamaterial panel be stacked, lowermost layer coordinate y=0
Wherein, n
minrepresent the refractive index value of bottom metamaterial sheet in each metamaterial panel; n
maxrepresent the refractive index value of the superiors' metamaterial sheet in each metamaterial panel; P represents the height of each metamaterial panel; A represents the number of plies of metamaterial panel, along with the number of plies of metamaterial panel increases, a gets 1 successively, 2,3,4 ... wherein a=1 represents bottom metamaterial panel; Refractive index when n (y) represents that ordinate is y.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110254553.6A CN102956950B (en) | 2011-08-31 | 2011-08-31 | Metamaterial-based directional coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110254553.6A CN102956950B (en) | 2011-08-31 | 2011-08-31 | Metamaterial-based directional coupler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102956950A CN102956950A (en) | 2013-03-06 |
| CN102956950B true CN102956950B (en) | 2015-05-27 |
Family
ID=47765428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110254553.6A Active CN102956950B (en) | 2011-08-31 | 2011-08-31 | Metamaterial-based directional coupler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102956950B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10233607A (en) * | 1997-02-19 | 1998-09-02 | Murata Mfg Co Ltd | Directional coupler |
| CN101162279A (en) * | 2006-10-13 | 2008-04-16 | 中国科学院半导体研究所 | Single-mode photon crystal polarization beam splitter |
| US8237519B2 (en) * | 2007-11-16 | 2012-08-07 | Rayspan Corporation | Filter design methods and filters based on metamaterial structures |
| CN201345404Y (en) * | 2008-12-08 | 2009-11-11 | 杭州紫光网络技术有限公司 | Microwave directional coupler with crimp type connector |
-
2011
- 2011-08-31 CN CN201110254553.6A patent/CN102956950B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102956950A (en) | 2013-03-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103441340B (en) | Variable and half-module substrate integrated waveguide leaky-wave antenna frequency scanning polarizes | |
| CN202633488U (en) | Resonance type substrate integrated waveguide power synthesizer | |
| CN103036046B (en) | A kind of feedback type satellite tv antenna and satellite television receiving system thereof | |
| CN112615148B (en) | Ultra-wideband circularly polarized super-surface antenna based on novel hybrid feed network | |
| CN201383549Y (en) | Multibeam antenna with high radiation efficiency | |
| CN103022614A (en) | Transition structure for substrate integrated waveguide and rectangular metal waveguide | |
| WO2022267572A1 (en) | Resonant electromagnetic decoupling component for improving transceiving isolation of millimeter wave radar | |
| CN103560310A (en) | Miniaturization substrate integration waveguide match load | |
| CN111129684A (en) | Millimeter wave 3dB directional coupler based on novel artificial magnetic conductor | |
| CN202454709U (en) | Directional coupler | |
| CN204167446U (en) | The integrated waveguide dual mode filter of line of rabbet joint disturbance | |
| CN102956950B (en) | Metamaterial-based directional coupler | |
| CN102956949B (en) | Metamaterial-based directional coupler | |
| CN203553318U (en) | Miniature SIW matching load | |
| WO2019233140A1 (en) | Liquid crystal phase shifter and electronic device | |
| CN204538170U (en) | There is the millimeter wave orthocoupler of arbitrarily coupling factor | |
| CN1937307A (en) | High performance frequency selective surface based on integrated waveguide multi-cavity cascade | |
| CN102956951B (en) | Based on the directional coupler of Meta Materials | |
| CN103187607B (en) | Directional coupler based on Meta Materials | |
| CN205178018U (en) | Integrated waveguide horn antenna of two circular polarization substrates in plane | |
| CN204968231U (en) | Ceramic base and basic multilayer circuit board that combines of epoxy | |
| CN102769192B (en) | Impedance matching element based on mixed material process | |
| CN103367906A (en) | Directional spreading antenna housing and directional antenna system | |
| CN102904045B (en) | Feedforward radar antenna | |
| CN113036411A (en) | Broadband circularly polarized reflective array antenna unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |