CN109742553A - A kind of double frequency-band line-circular polarisation converter based on electromagnetic induced transparency effect - Google Patents
A kind of double frequency-band line-circular polarisation converter based on electromagnetic induced transparency effect Download PDFInfo
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Abstract
A kind of double frequency-band line-circular polarisation converter based on electromagnetic induced transparency effect, belongs to Meta Materials polarization changer technical field, and the loss for solving the existing line based on Meta Materials-circular polarisation converter is big, the narrow problem of working band.Double frequency-band line-circular polarisation the converter includes multiple lines-circular polarisation converter unit of the forming array in x/y plane.Line-circular polarisation converter unit includes first medium block, second medium block and third medium block.For x polarization incidence wave, three medium blocks can inspire electromagnetic induced transparency effect at first frequency and second frequency.For y polarization incidence wave, three medium blocks can inspire electromagnetic induced transparency effect at third frequency and the 4th frequency.Under the common activation of x polarization incidence wave and y polarization incidence wave, the line-circular polarisation converter can realize line-circular polarisation transformation at the first centre frequency and at second central frequency.
Description
Technical field
The present invention relates to a kind of line-circular polarisation converters, belong to Meta Materials polarization changer technical field.
Background technique
Polarization of electromagnetic wave control, is especially converted to circularly polarised wave for line polarization wave, in communication, navigation and electronic countermeasure
Equal fields are of great significance.In recent years, Meta Materials are due to the polarizing control ability with several orders of magnitude bigger than natural material
With ultra-thin thickness, the regulation of polarization of electromagnetic wave characteristic has been increasingly being used for it.However, existing based on Meta Materials
Line-circular polarisation converter generallys use metal material and is made.Due to the dissipation loss characteristic of metal material itself, work as working frequency
When raising, the loss of this kind of line based on Meta Materials-circular polarisation converter increases, and this severely limits existing based on Meta Materials
The extensive use of line-circular polarisation converter.In addition to this, the existing line based on Meta Materials-circular polarisation converter works in transmission
When mode, have the shortcomings that working band is narrow.
Summary of the invention
The present invention be solve the existing line based on Meta Materials-circular polarisation converter loss it is big, the narrow problem of working band,
Propose a kind of double frequency-band line-circular polarisation converter based on electromagnetic induced transparency effect.
Double frequency-band line-circular polarisation converter of the present invention based on electromagnetic induced transparency effect includes multiple line-circles
Polarization conversion unit, multiple lines-circular polarisation converter unit forming array in x/y plane；
Line-circular polarisation converter unit includes first medium block 1, second medium block 2 and third medium block 3；
For x polarization incidence wave, at first frequency, first medium block 1, second medium block 2 and third medium block 3 are distinguished
Dark-state resonant element, illuminated state resonant element and illuminated state resonant element are constituted, the destructive interference between three inspires electromagnetic induction
Transparent effect；
For x polarization incidence wave, at second frequency, first medium block 1, second medium block 2 and third medium block 3 are distinguished
Illuminated state resonant element, quasi- dark-state resonant element and dark-state resonant element are constituted, the destructive interference between three inspires electromagnetism sense
Answer transparent effect；
For y polarization incidence wave, at third frequency, first medium block 1, second medium block 2 and third medium block 3 are distinguished
Illuminated state resonant element, illuminated state resonant element and dark-state resonant element are constituted, the destructive interference between three inspires electromagnetic induction
Transparent effect；
For y polarization incidence wave, at the 4th frequency, first medium block 1, second medium block 2 and third medium block 3 are distinguished
Dark-state resonant element, quasi- dark-state resonant element and illuminated state resonant element are constituted, the destructive interference between three inspires electromagnetism sense
Answer transparent effect；
Under the common activation of x polarization incidence wave and y polarization incidence wave, the line-circular polarisation converter can be first
Line-circular polarisation transformation is realized at centre frequency and at second central frequency.
As preferably, first medium block 1, second medium block 2 and third medium block 3 are all made of relative dielectric constant and are
110, loss angle tangent is made of 0.0015 ceramic material.
As preferably, first medium block 1, second medium block 2 and third medium block 3 are rectangular configuration；
Length, width and the height of first medium block 1 are respectively 7mm, 4mm and 3mm；
Length, width and the height of second medium block 2 are respectively 5mm, 5mm and 3mm；
Third medium block 3 is identical as the size of second medium block 2.
As preferably, the width edge and length sides of first medium block 1 are respectively parallel to the direction x and the direction y；
The mutually perpendicular length sides and width edge of second medium block 2 are respectively parallel to the direction x and the direction y；
The mutually perpendicular length sides and width edge of third medium block 3 are respectively parallel to the direction x and the direction y.
As preferably, the minimum spacing of first medium block 1 and second medium block 2 is 4mm, first medium block 1 and the
The minimum spacing of three medium blocks 3 is 2mm, and the minimum spacing of second medium block 2 and third medium block 3 is 3mm, first medium block 1
It is following conllinear with the top of third medium block 3.
As preferably, line-period of the circular polarisation converter unit on the direction x and the direction y is 16mm；
The minimum spacing on three medium blocks and line-circular polarisation converter unit boundary is 1.5mm.
As preferably, first frequency~the 4th frequency be respectively 6.30GHz, 6.41GHz, 6.22GHz and
6.36GHz。
As preferably, the first centre frequency and second central frequency are respectively 6.24GHz and 6.38GHz.
Double frequency-band line-circular polarisation converter of the present invention based on electromagnetic induced transparency effect, first medium block,
Second medium block and third medium block are all dielectric Meta Materials, and compared with metal Meta Materials, the loss of all dielectric Meta Materials is smaller.
Further, double frequency-band line-circular polarisation converter of the present invention based on electromagnetic induced transparency effect is based on first medium
Electromagnetic coupling between block, second medium block and third medium block, the low-loss Michaelis electromagnetic induced transparency effect of simulated implementation
It answers.Therefore, of the present invention to be imitated based on electromagnetic induced transparency compared with the line with existing based on Meta Materials-circular polarisation converter
Double frequency-band line-circular polarisation converter the loss answered is smaller.On the other hand, of the present invention to be based on electromagnetic induced transparency effect
Double frequency-band line-circular polarisation converter the electromagnetic induced transparency of double frequency-band can be realized respectively in orthogonal both direction
Effect, and then realize the polarization of ele control of double frequency-band.Therefore, with the existing line based on Meta Materials-circular polarisation converter
It compares, double frequency-band line-circular polarisation converter working band of the present invention based on electromagnetic induced transparency effect is wider.
Detailed description of the invention
It will hereinafter come based on the embodiments and with reference to the accompanying drawings to of the present invention based on electromagnetic induced transparency effect
Double frequency-band line-circular polarisation converter is described in more detail, in which:
Fig. 1 is line-circular polarisation converter unit structural schematic diagram that embodiment refers to；
Fig. 2 is double frequency-band line-circular polarisation converter artificial transmission charts for finned heat that embodiment refers to；
Fig. 3 is double frequency-band line-circular polarisation converter artificial transmission phase dygoram that embodiment refers to；
Fig. 4 is double frequency-band line-circular polarisation converter emulation ellipticity curve graph that embodiment refers to；
Fig. 5 is double frequency-band line-circular polarisation converter test transmission coefficient curve graph that embodiment refers to；
Fig. 6 is that phase dygoram is transmitted in double frequency-band line-circular polarisation converter test that embodiment refers to.
Specific embodiment
The double frequency-band line of the present invention based on electromagnetic induced transparency effect-circular polarisation is converted below in conjunction with attached drawing
Device is described further.
Embodiment: the present embodiment is explained in detail below with reference to Fig. 1 to Fig. 6.
Double frequency-band line-circular polarisation converter based on electromagnetic induced transparency effect described in the present embodiment includes multiple lines-
Circular polarisation converter unit, multiple lines-circular polarisation converter unit forming array in x/y plane；
Line-circular polarisation converter unit includes first medium block 1, second medium block 2 and third medium block 3；
For x polarization incidence wave, at first frequency, first medium block 1, second medium block 2 and third medium block 3 are distinguished
Dark-state resonant element, illuminated state resonant element and illuminated state resonant element are constituted, the destructive interference between three inspires electromagnetic induction
Transparent effect；
For x polarization incidence wave, at second frequency, first medium block 1, second medium block 2 and third medium block 3 are distinguished
Illuminated state resonant element, quasi- dark-state resonant element and dark-state resonant element are constituted, the destructive interference between three inspires electromagnetism sense
Answer transparent effect；
For y polarization incidence wave, at third frequency, first medium block 1, second medium block 2 and third medium block 3 are distinguished
Illuminated state resonant element, illuminated state resonant element and dark-state resonant element are constituted, the destructive interference between three inspires electromagnetic induction
Transparent effect；
For y polarization incidence wave, at the 4th frequency, first medium block 1, second medium block 2 and third medium block 3 are distinguished
Dark-state resonant element, quasi- dark-state resonant element and illuminated state resonant element are constituted, the destructive interference between three inspires electromagnetism sense
Answer transparent effect；
Under the common activation of x polarization incidence wave and y polarization incidence wave, the line-circular polarisation converter can be first
Line-circular polarisation transformation is realized at centre frequency and at second central frequency.
The first medium block 1, second medium block 2 and third medium block 3 of the present embodiment are all made of relative dielectric constant and are
110, loss angle tangent is made of 0.0015 ceramic material, the first medium block 1, second medium block 2 and third of the present embodiment
Medium block 3 is rectangular configuration, and length, width and the height of first medium block 1 are respectively 7mm, 4mm and 3mm, second medium block
2 length, width and height is respectively 5mm, 5mm and 3mm, and third medium block 3 is identical as the size of second medium block 2.
In the present embodiment, the width edge and length sides of first medium block 1 are respectively parallel to the direction x and the direction y；
The mutually perpendicular length sides and width edge of second medium block 2 are respectively parallel to the direction x and the direction y；
The mutually perpendicular length sides and width edge of third medium block 3 are respectively parallel to the direction x and the direction y.
In the present embodiment, the minimum spacing of first medium block 1 and second medium block 2 is 4mm, first medium block 1 and the
The minimum spacing of three medium blocks 3 is 2mm, and the minimum spacing of second medium block 2 and third medium block 3 is 3mm, first medium block 1
It is following conllinear with the top of third medium block 3.
The line of the present embodiment-period of the circular polarisation converter unit on the direction x and the direction y is 16mm；
The minimum spacing on three medium blocks and line-circular polarisation converter unit boundary is 1.5mm.
The first frequency of the present embodiment~the 4th frequency is respectively 6.30GHz, 6.41GHz, 6.22GHz and 6.36GHz.
First centre frequency and second central frequency of the present embodiment are respectively 6.24GHz and 6.38GHz.
Fig. 1 is line-circular polarisation converter unit structural schematic diagram of the present embodiment, wherein l1=4mm, l2=7mm, l3=
l4=l5=l6=5mm, s1=4mm, s2=2mm, s3=3mm, px=py=16mm.
The present embodiment verifies line-circular polarisation transformation function of the double frequency-band line-circular polarisation converter based on emulation experiment
Can:
For the electromagnetic wave of vertical incidence, artificial transmission coefficient such as Fig. 2 institute of the double frequency-band line-circular polarisation converter
Show, corresponding transmission phase difference is as shown in Figure 3.According to fig. 2 with Fig. 3 it is found that double frequency-band line-circular polarisation converter is in the pole x
Double frequency-band, low-loss electromagnetic induced transparency effect are realized under the conditions of the excitation of change wave and y polarized wave.Especially exist
Near 6.24GHz (point A), transmission coefficient Tx=Ty≈ -4.3dB, phase difference are about 90 °.Near 6.38GHz (point B), transmission
Coefficient Tx=Ty≈ -8.7dB, phase difference are about 82 °.Transmission coefficient and transmission phase difference at two frequencies meet line-circular polarisation
The realization condition of transformation.Therefore, double frequency-band line-circular polarisation converter based on electromagnetic induced transparency effect described in the present embodiment
Good line-circular polarisation mapping function can be implemented around in 6.24GHz and 6.38GHz.
In order to assess the polarization conversion performance of the double frequency-band line-circular polarisation converter, the present embodiment introduces Stokes
Parameter:
Wherein, αin=45 °.According to formula (1), oval angle χ can be indicated are as follows:
Wherein, χ=0 ° corresponds to line polarization wave, and χ=± 45 ° corresponds to circularly polarised wave.Therefore, ellipticity η can pass through
Normalize χ definition, it may be assumed that
Based on formula (3), the present embodiment calculates the ellipticity of the double frequency-band line-circular polarisation converter, as a result such as Fig. 4
It is shown.As can be seen from FIG. 4, ellipticity respectively reaches extreme value at spectrum position A, B, and value is about 0.96 and 0.94.Therefore, line
Polarization incidence wave is efficiently converted to circularly polarised wave near 6.24GHz and 6.38GHz respectively, further demonstrates this implementation
There is double frequency-band line-circular polarisation converter based on electromagnetic induced transparency effect described in example double frequency-band line-circular polarisation to convert function
Energy.
In order to further confirm the validity of the double frequency-band line-circular polarisation converter, the present embodiment machined described double
Frequency band line-circular polarisation converter, and its transmission coefficient and transmission phase difference are tested, as shown in Figure 5 and Figure 6.According to Fig. 5 and figure
6 it is found that test result is almost the same with simulation result, for x polarization incidence wave and y polarization incidence wave, the electromagnetism sense of double frequency-band
Transparent effect is answered to be excited, and the electromagnetic induced transparency window on two orthogonal directions overlaps each other.In particular,
Near 6.24GHz, the amplitude at the A of transmission coefficient crosspoint is about -3.9dB, and phase difference is about 82 °, realizes low-loss line -
Circular polarisation transformation.Meanwhile near 6.37GHz, the amplitude at the B of transmission coefficient crosspoint is about -8.9dB, and phase difference is about
79 °, also achieve line-circular polarisation transformation.
Double frequency-band line-circular polarisation converter based on electromagnetic induced transparency effect described in the present embodiment uses complete be situated between
Matter Meta Materials, all dielectric Meta Materials have significant advantage in terms of reducing loss and widening, are based particularly on
The all dielectric Meta Materials of electromagnetic induced transparency effect have many advantages, such as that transmission loss is low, strong phase effect of dispersion.
Double frequency-band line-circular polarisation converter based on electromagnetic induced transparency effect described in the present embodiment, polarizing control
It is related with electromagnetic response when two polarized wave incidence, it is unrelated with the thickness of device.Therefore, based on electromagnetism described in the present embodiment
Double frequency-band line-circular polarisation converter of inducing transparent effect has the advantages that (~0.0625 λ, λ are polarization conversion hair to thickness ultrathin
The corresponding wavelength of frequency when raw).
Although describing the present invention herein with reference to specific embodiment, it should be understood that, these realities
Applying example only is the example of principles and applications.It should therefore be understood that can be permitted exemplary embodiment
More modifications, and can be designed that other arrangements, without departing from spirit of the invention as defined in the appended claims and
Range.It should be understood that different appurtenances can be combined by being different from mode described in original claim
It is required that and feature described herein.It will also be appreciated that the feature in conjunction with described in separate embodiments can be used at it
In his embodiment.
Claims (8)
1. a kind of double frequency-band line-circular polarisation converter based on electromagnetic induced transparency effect, which is characterized in that the line-entelechy
Changing converter includes multiple lines-circular polarisation converter unit, multiple lines-circular polarisation converter unit forming array in x/y plane；
Line-circular polarisation converter unit includes first medium block (1), second medium block (2) and third medium block (3)；
For x polarization incidence wave, at first frequency, first medium block (1), second medium block (2) and third medium block (3) point
Not Gou Cheng dark-state resonant element, illuminated state resonant element and illuminated state resonant element, the destructive interference between three inspires electromagnetism sense
Answer transparent effect；
For x polarization incidence wave, at second frequency, first medium block (1), second medium block (2) and third medium block (3) point
Not Gou Cheng illuminated state resonant element, quasi- dark-state resonant element and dark-state resonant element, the destructive interference between three inspires electromagnetism
Inducing transparent effect；
For y polarization incidence wave, at third frequency, first medium block (1), second medium block (2) and third medium block (3) point
Not Gou Cheng illuminated state resonant element, illuminated state resonant element and dark-state resonant element, the destructive interference between three inspires electromagnetism sense
Answer transparent effect；
For y polarization incidence wave, at the 4th frequency, first medium block (1), second medium block (2) and third medium block (3) point
Not Gou Cheng dark-state resonant element, quasi- dark-state resonant element and illuminated state resonant element, the destructive interference between three inspires electromagnetism
Inducing transparent effect；
Under the common activation of x polarization incidence wave and y polarization incidence wave, the line-circular polarisation converter can be at the first center
Line-circular polarisation transformation is realized at frequency and at second central frequency.
2. double frequency-band line-circular polarisation converter as described in claim 1 based on electromagnetic induced transparency effect, feature exist
In, first medium block (1), second medium block (2) and third medium block (3) be all made of relative dielectric constant be 110, loss angle just
0.0015 ceramic material is cut to be made.
3. double frequency-band line-circular polarisation converter as claimed in claim 2 based on electromagnetic induced transparency effect, feature exist
In first medium block (1), second medium block (2) and third medium block (3) are rectangular configuration；
Length, width and the height of first medium block (1) are respectively 7mm, 4mm and 3mm；
Length, width and the height of second medium block (2) are respectively 5mm, 5mm and 3mm；
Third medium block (3) is identical as the size of second medium block (2).
4. double frequency-band line-circular polarisation converter as claimed in claim 3 based on electromagnetic induced transparency effect, feature exist
In the width edge and length sides of first medium block (1) are respectively parallel to the direction x and the direction y；
The mutually perpendicular length sides and width edge of second medium block (2) are respectively parallel to the direction x and the direction y；
The mutually perpendicular length sides and width edge of third medium block (3) are respectively parallel to the direction x and the direction y.
5. double frequency-band line-circular polarisation converter as claimed in claim 4 based on electromagnetic induced transparency effect, feature exist
Minimum spacing in, first medium block (1) and second medium block (2) is 4mm, first medium block (1) and third medium block (3)
Minimum spacing is 2mm, and the minimum spacing of second medium block (2) and third medium block (3) is 3mm, first medium block (1) it is following
It is conllinear with the top of third medium block (3).
6. double frequency-band line-circular polarisation converter as claimed in claim 5 based on electromagnetic induced transparency effect, feature exist
In line-period of the circular polarisation converter unit on the direction x and the direction y is 16mm；
The minimum spacing on three medium blocks and line-circular polarisation converter unit boundary is 1.5mm.
7. double frequency-band line-circular polarisation converter as claimed in claim 6 based on electromagnetic induced transparency effect, feature exist
In first frequency~the 4th frequency is respectively 6.30GHz, 6.41GHz, 6.22GHz and 6.36GHz.
8. double frequency-band line-circular polarisation converter as claimed in claim 7 based on electromagnetic induced transparency effect, feature exist
In the first centre frequency and second central frequency are respectively 6.24GHz and 6.38GHz.
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