CN109742553B - Double-frequency-band linear-circular polarization converter based on electromagnetic induction transparent effect - Google Patents
Double-frequency-band linear-circular polarization converter based on electromagnetic induction transparent effect Download PDFInfo
- Publication number
- CN109742553B CN109742553B CN201910153237.6A CN201910153237A CN109742553B CN 109742553 B CN109742553 B CN 109742553B CN 201910153237 A CN201910153237 A CN 201910153237A CN 109742553 B CN109742553 B CN 109742553B
- Authority
- CN
- China
- Prior art keywords
- dielectric block
- circular polarization
- resonance unit
- linear
- state resonance
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Aerials With Secondary Devices (AREA)
Abstract
A dual-band linear-circular polarization converter based on an electromagnetic induction transparent effect belongs to the technical field of metamaterial polarization converters and solves the problems of large loss and narrow working frequency band of the existing linear-circular polarization converter based on a metamaterial. The dual-band linear-circular polarization converter includes a plurality of linear-circular polarization conversion units that form an array in the xy plane. The line-circular polarization conversion unit includes a first dielectric block, a second dielectric block, and a third dielectric block. For an x-polarized incident wave, the three dielectric blocks can excite an electromagnetic induction transparency effect at a first frequency and a second frequency. For an incident wave with y-polarization, the three dielectric blocks can excite the electromagnetic induction transparent effect at a third frequency and a fourth frequency. Under the common excitation of an x-polarized incident wave and a y-polarized incident wave, the linear-circular polarization converter can realize linear-circular polarization conversion at a first central frequency and a second central frequency.
Description
Technical Field
The invention relates to a linear-circular polarization converter, and belongs to the technical field of metamaterial polarization converters.
Background
Polarization control of electromagnetic waves, particularly conversion of linearly polarized waves into circularly polarized waves, is of great significance in the fields of communication, navigation, electronic countermeasure and the like. In recent years, metamaterials have been increasingly used for polarization characteristic control of electromagnetic waves due to their polarization control ability several orders of magnitude greater than natural materials and ultra-thin thickness. However, the existing metamaterial-based linear-circular polarization converters are generally made of metal materials. Due to the inherent dissipative loss characteristics of the metal material, the loss of the metamaterial-based linear-circular polarization converter increases when the operating frequency increases, which severely limits the wide application of the existing metamaterial-based linear-circular polarization converter. In addition, the existing metamaterial-based linear-circular polarization converter has the defect of narrow operating frequency band when operating in a transmission mode.
Disclosure of Invention
The invention provides a dual-band linear-circular polarization converter based on an electromagnetic induction transparent effect, which aims to solve the problems of large loss and narrow working frequency band of the existing linear-circular polarization converter based on a metamaterial.
The double-frequency-band linear-circular polarization converter based on the electromagnetic induction transparent effect comprises a plurality of linear-circular polarization conversion units, wherein the plurality of linear-circular polarization conversion units form an array in an xy plane;
the linear-circular polarization conversion unit comprises a first dielectric block 1, a second dielectric block 2 and a third dielectric block 3;
for an x-polarization incident wave, at a first frequency, the first dielectric block 1, the second dielectric block 2 and the third dielectric block 3 respectively form a dark-state resonance unit, a bright-state resonance unit and a bright-state resonance unit, and destructive interference among the dark-state resonance unit, the bright-state resonance unit and the bright-state resonance unit excites an electromagnetic induction transparent effect;
for an x-polarization incident wave, at a second frequency, the first dielectric block 1, the second dielectric block 2 and the third dielectric block 3 respectively form a bright-state resonance unit, a quasi-dark-state resonance unit and a dark-state resonance unit, and destructive interference among the bright-state resonance unit, the quasi-dark-state resonance unit and the dark-state resonance unit excites an electromagnetic induction transparent effect;
for a y-polarized incident wave, at a third frequency, the first dielectric block 1, the second dielectric block 2 and the third dielectric block 3 respectively form a bright-state resonance unit, a bright-state resonance unit and a dark-state resonance unit, and the destructive interference among the bright-state resonance unit, the bright-state resonance unit and the dark-state resonance unit excites an electromagnetic induction transparent effect;
for a y-polarized incident wave, at a fourth frequency, the first dielectric block 1, the second dielectric block 2 and the third dielectric block 3 respectively form a dark-state resonance unit, a quasi-dark-state resonance unit and a bright-state resonance unit, and the destructive interference among the dark-state resonance unit, the quasi-dark-state resonance unit and the bright-state resonance unit excites an electromagnetic induction transparent effect;
under the common excitation of an x-polarized incident wave and a y-polarized incident wave, the linear-circular polarization converter can realize linear-circular polarization conversion at a first central frequency and a second central frequency.
Preferably, the first dielectric block 1, the second dielectric block 2, and the third dielectric block 3 are made of a ceramic material having a relative dielectric constant of 110 and a loss tangent of 0.0015.
Preferably, the first dielectric block 1, the second dielectric block 2 and the third dielectric block 3 are all rectangular structures;
the length, the width and the height of the first medium block 1 are respectively 7mm, 4mm and 3 mm;
the length, the width and the height of the second medium block 2 are respectively 5mm, 5mm and 3 mm;
the third dielectric block 3 is the same size as the second dielectric block 2.
Preferably, the width side and the length side of the first dielectric block 1 are parallel to the x direction and the y direction, respectively;
the length side and the width side of the second dielectric block 2 which are perpendicular to each other are respectively parallel to the x direction and the y direction;
the length sides and the width sides of the third dielectric block 3, which are perpendicular to each other, are parallel to the x-direction and the y-direction, respectively.
Preferably, the minimum distance between the first dielectric block 1 and the second dielectric block 2 is 4mm, the minimum distance between the first dielectric block 1 and the third dielectric block 3 is 2mm, the minimum distance between the second dielectric block 2 and the third dielectric block 3 is 3mm, and the lower edge of the first dielectric block 1 is collinear with the upper edge of the third dielectric block 3.
Preferably, the period of the linear-circular polarization conversion unit in the x direction and the period of the linear-circular polarization conversion unit in the y direction are both 16 mm;
the minimum distance between the three dielectric blocks and the boundary of the linear-circular polarization conversion unit is 1.5 mm.
Preferably, the first to fourth frequencies are 6.30GHz, 6.41GHz, 6.22GHz, and 6.36GHz, respectively.
Preferably, the first center frequency and the second center frequency are 6.24GHz and 6.38GHz, respectively.
According to the double-frequency-band linear-circular polarization converter based on the electromagnetic induction transparent effect, the first dielectric block, the second dielectric block and the third dielectric block are all made of the all-dielectric metamaterial, and compared with a metal metamaterial, the loss of the all-dielectric metamaterial is small. Furthermore, the double-frequency-band linear-circular polarization converter based on the electromagnetic induction transparent effect simulates and realizes the low-loss Mie electromagnetic induction transparent effect based on the electromagnetic coupling among the first dielectric block, the second dielectric block and the third dielectric block. Therefore, compared with the existing linear-circular polarization converter based on the metamaterial, the dual-band linear-circular polarization converter based on the electromagnetic induction transparent effect has smaller loss. On the other hand, the dual-band linear-circular polarization converter based on the electromagnetic induction transparent effect can respectively realize the electromagnetic induction transparent effect of the dual frequency bands in two mutually perpendicular directions, and further realize the electromagnetic wave polarization control of the dual frequency bands. Therefore, compared with the existing linear-circular polarization converter based on the metamaterial, the dual-band linear-circular polarization converter based on the electromagnetic induction transparent effect has a wider operating band.
Drawings
Hereinafter, the dual-band linear-circular polarization converter based on the electromagnetic induction transparent effect according to the present invention will be described in more detail based on embodiments with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a linear-circular polarization conversion unit according to an embodiment;
FIG. 2 is a graph showing simulated transmission coefficients of the dual-band linear-circular polarization converter according to the embodiment;
FIG. 3 is a graph showing a simulated transmission phase difference of the dual-band linear-circular polarization converter according to the embodiment;
FIG. 4 is a graph of simulated ellipticity of a dual-band linear-circular polarization transformer according to the present example;
FIG. 5 is a graph of the test transmission coefficients of the dual-band linear-circular polarization converter according to the embodiment;
fig. 6 is a graph showing a test transmission phase difference of the dual-band linear-circular polarization converter according to the embodiment.
Detailed Description
The dual-band linear-circular polarization converter based on the electromagnetic induction transparent effect according to the present invention will be further described with reference to the accompanying drawings.
Example (b): the present embodiment is described in detail below with reference to fig. 1 to 6.
The dual-band linear-circular polarization converter based on the electromagnetic induction transparent effect comprises a plurality of linear-circular polarization conversion units, wherein the plurality of linear-circular polarization conversion units form an array in an xy plane;
the linear-circular polarization conversion unit comprises a first dielectric block 1, a second dielectric block 2 and a third dielectric block 3;
for an x-polarization incident wave, at a first frequency, the first dielectric block 1, the second dielectric block 2 and the third dielectric block 3 respectively form a dark-state resonance unit, a bright-state resonance unit and a bright-state resonance unit, and destructive interference among the dark-state resonance unit, the bright-state resonance unit and the bright-state resonance unit excites an electromagnetic induction transparent effect;
for an x-polarization incident wave, at a second frequency, the first dielectric block 1, the second dielectric block 2 and the third dielectric block 3 respectively form a bright-state resonance unit, a quasi-dark-state resonance unit and a dark-state resonance unit, and destructive interference among the bright-state resonance unit, the quasi-dark-state resonance unit and the dark-state resonance unit excites an electromagnetic induction transparent effect;
for a y-polarized incident wave, at a third frequency, the first dielectric block 1, the second dielectric block 2 and the third dielectric block 3 respectively form a bright-state resonance unit, a bright-state resonance unit and a dark-state resonance unit, and the destructive interference among the bright-state resonance unit, the bright-state resonance unit and the dark-state resonance unit excites an electromagnetic induction transparent effect;
for a y-polarized incident wave, at a fourth frequency, the first dielectric block 1, the second dielectric block 2 and the third dielectric block 3 respectively form a dark-state resonance unit, a quasi-dark-state resonance unit and a bright-state resonance unit, and the destructive interference among the dark-state resonance unit, the quasi-dark-state resonance unit and the bright-state resonance unit excites an electromagnetic induction transparent effect;
under the common excitation of an x-polarized incident wave and a y-polarized incident wave, the linear-circular polarization converter can realize linear-circular polarization conversion at a first central frequency and a second central frequency.
The first dielectric block 1, the second dielectric block 2 and the third dielectric block 3 of this embodiment are all made of a ceramic material having a relative dielectric constant of 110 and a loss tangent of 0.0015, the first dielectric block 1, the second dielectric block 2 and the third dielectric block 3 of this embodiment are all rectangular structures, the length, the width and the height of the first dielectric block 1 are respectively 7mm, 4mm and 3mm, the length, the width and the height of the second dielectric block 2 are respectively 5mm, 5mm and 3mm, and the third dielectric block 3 is the same as the second dielectric block 2 in size.
In the present embodiment, the width side and the length side of the first dielectric block 1 are parallel to the x direction and the y direction, respectively;
the length side and the width side of the second dielectric block 2 which are perpendicular to each other are respectively parallel to the x direction and the y direction;
the length sides and the width sides of the third dielectric block 3, which are perpendicular to each other, are parallel to the x-direction and the y-direction, respectively.
In this embodiment, the minimum distance between the first dielectric block 1 and the second dielectric block 2 is 4mm, the minimum distance between the first dielectric block 1 and the third dielectric block 3 is 2mm, the minimum distance between the second dielectric block 2 and the third dielectric block 3 is 3mm, and the lower edge of the first dielectric block 1 is collinear with the upper edge of the third dielectric block 3.
The period of the linear-circular polarization conversion unit of the embodiment in the x direction and the y direction is 16 mm;
the minimum distance between the three dielectric blocks and the boundary of the linear-circular polarization conversion unit is 1.5 mm.
The first to fourth frequencies of this embodiment are 6.30GHz, 6.41GHz, 6.22GHz, and 6.36GHz, respectively.
The first center frequency and the second center frequency of the present embodiment are 6.24GHz and 6.38GHz, respectively.
FIG. 1 is a schematic structural diagram of a linear-circular polarization conversion unit of this embodiment, wherein l1＝4mm，l2＝7mm，l3＝l4＝l5＝l6＝5mm，s1＝4mm，s2＝2mm，s3＝3mm，px＝py＝16mm。
The present embodiment verifies the linear-circular polarization conversion function of the dual-band linear-circular polarization converter based on simulation experiments:
for a vertically incident electromagnetic wave, the simulated transmission coefficients of the dual-band linear-circular polarization converter are shown in fig. 2, and the corresponding transmission phase differences are shown in fig. 3. As can be seen from fig. 2 and 3, the dual-band linear-circular polarization converter achieves a dual-band and low-loss electromagnetic induction transparent effect under the excitation conditions of the x-polarized wave and the y-polarized wave. Especially around 6.24GHz (point A), the transmission coefficient Tx＝TyApproximately 4.3dB, the phase difference is approximately 90 °. Near 6.38GHz (point B), the transmission coefficient Tx＝TyApproximately-8.7 dB, the phase difference is approximately 82 °. The transmission coefficients and the transmission phase difference at the two frequencies satisfy the realization condition of the linear-circular polarization transformation. Therefore, this implementationThe dual-band linear-circular polarization converter based on the electromagnetic induction transparent effect can realize good linear-circular polarization conversion function in the vicinity of 6.24GHz and 6.38 GHz.
To evaluate the polarization conversion performance of the dual-band linear-circular polarization converter, the present embodiment introduces stokes parameters:
wherein, αin45 deg. is equal to. According to equation (1), the ellipse angle χ may be expressed as:
where χ 0 ° corresponds to a linearly polarized wave and χ ± 45 ° corresponds to a circularly polarized wave, the ellipticity η may therefore be defined by normalizing χ, i.e.:
based on equation (3), the present embodiment calculates the ellipticity of the dual-band line-circular polarization converter, and the result is shown in fig. 4. As can be seen from fig. 4, the ellipticity reaches an extreme value at spectral position A, B, which is approximately 0.96 and 0.94, respectively. Therefore, the linear polarization incident wave is efficiently converted into the circular polarization wave in the vicinity of 6.24GHz and 6.38GHz respectively, and the dual-band linear-circular polarization converter based on the electromagnetic induction transparent effect has further proved that the dual-band linear-circular polarization converter has the dual-band linear-circular polarization conversion function.
To further confirm the effectiveness of the dual-band linear-circular polarization converter, the present example processed the dual-band linear-circular polarization converter and tested the transmission coefficient and the transmission phase difference thereof, as shown in fig. 5 and 6. As can be seen from fig. 5 and fig. 6, the test result is substantially consistent with the simulation result, the dual-band electromagnetic induction transparent effect is excited for both the x-polarized incident wave and the y-polarized incident wave, and the electromagnetic induction transparent windows in the two orthogonal directions overlap with each other. Particularly, the amplitude at the transmission coefficient cross point A is about-3.9 dB and the phase difference is about 82 degrees in the vicinity of 6.24GHz, so that low-loss line-circular polarization conversion is realized. Meanwhile, the amplitude at the transmission coefficient cross point B is about-8.9 dB and the phase difference is about 79 degrees in the vicinity of 6.37GHz, so that the linear-circular polarization transformation is realized.
The dual-band linear-circular polarization converter based on the electromagnetic induction transparent effect adopts the all-dielectric metamaterial, the all-dielectric metamaterial has remarkable advantages in the aspects of reducing loss, widening working bandwidth and the like, and particularly the all-dielectric metamaterial based on the electromagnetic induction transparent effect has the advantages of low transmission loss, strong phase dispersion effect and the like.
The polarization control of the dual-band linear-circular polarization converter based on the electromagnetic induction transparency effect is related to the electromagnetic response when two polarized waves are incident, and is not related to the thickness of the device. Therefore, the dual-band linear-circular polarization converter based on the electromagnetic induction transparent effect has the advantage of ultra-thin thickness (0.0625 λ, λ is the wavelength corresponding to the frequency when the polarization conversion occurs).
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (8)
1. A dual-band linear-circular polarization converter based on an electromagnetic induction transparent effect is characterized by comprising a plurality of linear-circular polarization conversion units, wherein the plurality of linear-circular polarization conversion units form an array in an xy plane;
the linear-circular polarization conversion unit comprises a first dielectric block (1), a second dielectric block (2) and a third dielectric block (3);
for an x-polarization incident wave, at a first frequency, a first dielectric block (1), a second dielectric block (2) and a third dielectric block (3) respectively form a dark-state resonance unit, a bright-state resonance unit and a bright-state resonance unit, and destructive interference among the dark-state resonance unit, the bright-state resonance unit and the bright-state resonance unit excites an electromagnetic induction transparent effect;
for an x-polarization incident wave, at a second frequency, the first dielectric block (1), the second dielectric block (2) and the third dielectric block (3) respectively form a bright-state resonance unit, a quasi-dark-state resonance unit and a dark-state resonance unit, and the destructive interference among the bright-state resonance unit, the quasi-dark-state resonance unit and the dark-state resonance unit excites an electromagnetic induction transparent effect;
for a y-polarized incident wave, at a third frequency, the first dielectric block (1), the second dielectric block (2) and the third dielectric block (3) respectively form a bright-state resonance unit, a bright-state resonance unit and a dark-state resonance unit, and the destructive interference among the bright-state resonance unit, the bright-state resonance unit and the dark-state resonance unit excites an electromagnetic induction transparent effect;
for a y-polarized incident wave, at a fourth frequency, the first dielectric block (1), the second dielectric block (2) and the third dielectric block (3) respectively form a dark-state resonance unit, a quasi-dark-state resonance unit and a bright-state resonance unit, and the destructive interference among the dark-state resonance unit, the quasi-dark-state resonance unit and the bright-state resonance unit excites an electromagnetic induction transparent effect;
under the common excitation of an x-polarized incident wave and a y-polarized incident wave, the linear-circular polarization converter can realize linear-circular polarization conversion at a first central frequency and a second central frequency;
the geometric centers of the first dielectric block (1), the second dielectric block (2) and the third dielectric block (3) are arranged in a triangular mode.
2. The dual band linear-circular polarization converter based on the electromagnetic induction transparency effect as claimed in claim 1, wherein the first dielectric block (1), the second dielectric block (2) and the third dielectric block (3) are made of ceramic materials having a relative dielectric constant of 110 and a loss tangent of 0.0015.
3. The dual-band linear-circular polarization converter based on the electromagnetic induction transparency effect as claimed in claim 2, wherein the first dielectric block (1), the second dielectric block (2) and the third dielectric block (3) are all rectangular structures;
the length, the width and the height of the first medium block (1) are respectively 7mm, 4mm and 3 mm;
the length, the width and the height of the second medium block (2) are respectively 5mm, 5mm and 3 mm;
the third dielectric block (3) and the second dielectric block (2) have the same size.
4. The dual band linear-circular polarization converter based on the electromagnetic induction transparency effect as claimed in claim 3, wherein the width side and the length side of the first dielectric block (1) are parallel to the x direction and the y direction, respectively;
the length side and the width side of the second medium block (2) which are vertical to each other are respectively parallel to the x direction and the y direction;
the length side and the width side of the third dielectric block (3) which are perpendicular to each other are parallel to the x direction and the y direction, respectively.
5. The dual-band linear-circular polarization converter based on the electromagnetic induction transparency effect as claimed in claim 4, wherein the minimum distance between the first dielectric block (1) and the second dielectric block (2) is 4mm, the minimum distance between the first dielectric block (1) and the third dielectric block (3) is 2mm, the minimum distance between the second dielectric block (2) and the third dielectric block (3) is 3mm, and the lower edge of the first dielectric block (1) is collinear with the upper edge of the third dielectric block (3).
6. The dual-band linear-circular polarization converter based on the electromagnetic induction transparency effect as claimed in claim 5, wherein the period of the linear-circular polarization conversion unit in the x direction and the y direction is 16 mm;
the minimum distance between the three dielectric blocks and the boundary of the linear-circular polarization conversion unit is 1.5 mm.
7. The dual-band linear-circular polarization converter based on the electromagnetic induction transparency effect as claimed in claim 6, wherein the first to fourth frequencies are 6.30GHz, 6.41GHz, 6.22GHz and 6.36GHz, respectively.
8. The dual-band linear-circular polarization converter based on the electromagnetic induction transparency effect as claimed in claim 7, wherein the first center frequency and the second center frequency are 6.24GHz and 6.38GHz, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910153237.6A CN109742553B (en) | 2019-02-28 | 2019-02-28 | Double-frequency-band linear-circular polarization converter based on electromagnetic induction transparent effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910153237.6A CN109742553B (en) | 2019-02-28 | 2019-02-28 | Double-frequency-band linear-circular polarization converter based on electromagnetic induction transparent effect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109742553A CN109742553A (en) | 2019-05-10 |
| CN109742553B true CN109742553B (en) | 2020-07-31 |
Family
ID=66368903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910153237.6A Expired - Fee Related CN109742553B (en) | 2019-02-28 | 2019-02-28 | Double-frequency-band linear-circular polarization converter based on electromagnetic induction transparent effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109742553B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110444898A (en) * | 2019-07-31 | 2019-11-12 | 天津大学 | A kind of broadband transmission enhancing device and control method |
| CN111628296B (en) * | 2020-05-29 | 2021-07-30 | 安徽师范大学 | Reflection-type dual-band dual-rotation-direction microwave section line-circular polarization converter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108987935A (en) * | 2018-06-29 | 2018-12-11 | 东南大学 | A kind of vortex wave Meta Materials reflective array for polarizing controllable and its design method |
| CN109361067A (en) * | 2018-12-03 | 2019-02-19 | 南京信息工程大学 | A kind of polarization converter turning 90 degrees any direction polarization of ele partially |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8334815B2 (en) * | 2009-07-20 | 2012-12-18 | Kvh Industries, Inc. | Multi-feed antenna system for satellite communications |
| KR101762913B1 (en) * | 2016-01-08 | 2017-07-28 | 광주과학기술원 | Metamaterial based Electromagnetic wave Polarization Converter |
| CN106887653B (en) * | 2017-03-24 | 2018-11-02 | 齐齐哈尔大学 | A kind of all dielectric polarization changer based on electromagnetic induced transparency effect |
| CN108767491B (en) * | 2018-05-22 | 2020-07-28 | 宁波大学 | Dual-frequency dual-circular polarizer based on FSS |
| CN109378591B (en) * | 2018-08-23 | 2022-04-22 | 南京航空航天大学 | Conformal broadband reflection type linear polarization converter insensitive to angle |
-
2019
- 2019-02-28 CN CN201910153237.6A patent/CN109742553B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108987935A (en) * | 2018-06-29 | 2018-12-11 | 东南大学 | A kind of vortex wave Meta Materials reflective array for polarizing controllable and its design method |
| CN109361067A (en) * | 2018-12-03 | 2019-02-19 | 南京信息工程大学 | A kind of polarization converter turning 90 degrees any direction polarization of ele partially |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109742553A (en) | 2019-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Tang et al. | Differential dual-polarized filtering dielectric resonator antenna | |
| US9831557B2 (en) | Broadband circularly polarized antenna using metasurface | |
| CN109742553B (en) | Double-frequency-band linear-circular polarization converter based on electromagnetic induction transparent effect | |
| CN109193167B (en) | Miniaturized frequency selective surface with low ratio of high resonance point to low resonance point | |
| CN105390819A (en) | Ultra-wideband electromagnetic super-surface circular polarizer | |
| Wang et al. | 140 GHz frequency selective surface based on hexagon substrate integrated waveguide cavity using normal PCB process | |
| Seman et al. | Investigations on fractal square loop FSS at oblique incidence for GSM applications | |
| Kumar et al. | A novel metamaterial electromagnetic band gap (MM-EBG) isolator to reduce mutual coupling in low-profile MIMO antenna | |
| Wang et al. | Design of a self-complementary frequency selective surface with multi-band polarization separation characteristic | |
| US10344473B2 (en) | Device without blocking wireless signals based on impedance matching | |
| CN102780086B (en) | Novel dual-frequency patch antenna with resonance ring microstructure array | |
| US9111714B2 (en) | Backward-wave oscillator in communication system | |
| Zheng et al. | Characteristics of planar PBG structures with a cover layer | |
| Jain et al. | Miniaturization of microstrip patch antenna using metamaterial loaded with SRR | |
| Zhou et al. | Narrowband frequency selective surface based on substrate integrated waveguide technology | |
| CN114759356A (en) | Wave-absorbing and linear polarization conversion dual-functional metamaterial unit and planar metamaterial | |
| Niu et al. | Isolation enhancement using a novel array-antenna decoupling surface for microstrip antennas | |
| Halim et al. | Design and improvement a novel microstrip antenna using array of composite right/left handed transmission line (CRLH-TL) technique for multiband applications | |
| Chen et al. | High sideband suppression dual-mode filters using new CPW resonator | |
| Guo et al. | GaAs spoof surface plasmon polariton half-mode substrate integrated waveguide | |
| Nguyen et al. | Impedance-matched high-index ceramic microwave metamaterials at X-band | |
| Yarga et al. | Degenerate band edge crystals and periodic assemblies for antenna applications | |
| Xiao | Novel microstrip dual-mode bandpass filter using isosceles triangular patch resonator with fractal-shaped structure | |
| Baena et al. | Broadband uniaxial dielectric-magnetic metamaterial with giant anisotropy factor | |
| Olokede et al. | A novel t-fed 4-element quasi-lumped resonator antenna array |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200731 Termination date: 20210228 |