CN113851809B - Non-reciprocal coupler based on artificial surface plasmon - Google Patents
Non-reciprocal coupler based on artificial surface plasmon Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
- H01P5/188—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being dielectric waveguides
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Abstract
The invention discloses a non-reciprocal coupler based on artificial surface plasmons, and belongs to the technical field of microwave devices. The non-reciprocal coupler comprises a metal ground plane, a square ring ferrite and an internal artificial surface plasmon waveguide, wherein the metal ground plane, the square ring ferrite, the internal artificial surface plasmon waveguide, the square ring ferrite and the metal ground plane are sequentially stacked. The nonreciprocal coupler can realize that electromagnetic energy is input from a single direction only, and has the characteristic of directional coupling; when the electromagnetic energy is input from the opposite direction, the electromagnetic energy is not coupled and can only be output along the designated port. Similarly, when the magnetic field direction is switched, its transmission behavior has opposite characteristics. The non-reciprocal coupler can effectively regulate and control the transmission of electromagnetic signals and has wide application prospect in aerospace, radar and microwave communication systems.
Description
Technical Field
The invention belongs to the technical field of microwave devices, and particularly relates to a non-reciprocal coupler based on artificial surface plasmons.
Background
Couplers are widely used in various microwave circuits and wireless communication systems. A directional coupler is one of the most typical couplers and is easy to design, performs well, can be perfectly matched on all ports, and provides the desired isolation between output ports. However, when electromagnetic signals are input along different ports of the directional coupler, the transmission characteristics have reciprocity. With the rapid development of microwave communication technology, higher requirements are provided for the aspects of realizing directional transmission of electromagnetic signals, avoiding interference between transmission signals, protecting signal sources and the like, so that the design of realizing a non-reciprocal coupling one-way transmission device is more worthy of thinking and research of people.
With the continuous development of modern science and technology, the demand for different types of non-reciprocal devices is also continuously increased, making the design difficult to implement and manufacture. How to design a nonreciprocal device with characteristics of flexibly regulating and controlling electromagnetic signals, nonreciprocal integration property and the like has become a research hotspot and difficulty at present. Therefore, it is of great significance to design a non-reciprocal microwave device with unidirectional coupling characteristic, miniaturization and easy preparation in the microwave band.
At present, researchers at home and abroad mainly adopt a special guided wave system or a magnetic medium to develop a non-reciprocal coupling device for unidirectional transmission of electromagnetic waves. (1) A coupling device for regulating and controlling non-reciprocal transmission of electromagnetic waves is designed by using a special guided wave system. For example, the unidirectional transmission of electromagnetic waves is realized by using a unidirectional electromagnetic mode formed at the interface between a semi-infinite photonic crystal and a semi-infinite metal structure under the condition of applying a magnetic field, and the design concept of the nonreciprocal coupler is provided by utilizing the interaction between the unidirectional electromagnetic mode and a single-mode resonant cavity. The half-infinite metal provides a one-way surface mode under the condition of applying a magnetic field, the forbidden band characteristic of the half-infinite large photonic crystal is used for inhibiting the scattering loss of energy, the one-way electromagnetic mode and the single mold cavity interact to realize the coupling of the energy, and the transmission of the energy has the characteristic of adjustable magnetism. (2) The magneto-optical crystal system formed by magnetic media is used for realizing the up-loading and down-loading filtering of the non-reciprocal coupling of electromagnetic waves. For example: the non-reciprocal transmission of electromagnetic energy unidirectional coupling is realized by utilizing the lateral coupling between the unidirectional guided wave mode and the cavity mode supported in the conventional photonic crystal and the gyromagnetic photonic crystal. The electromagnetic surface mode of the gyromagnetic photonic crystal has unidirectionality, the conventional photonic crystal has forbidden band characteristics, electromagnetic energy is bound in a channel between the two photonic crystals for unidirectional transmission, and a cavity structure is introduced into the gyromagnetic photonic crystal, so that the coupling effect between the unidirectional mode and the cavity mode is realized. This unique optical transmission characteristic can be used to construct a unidirectional coupler that is selective to electromagnetic signals propagating in a particular direction. (3) The unidirectional transmission of electromagnetic waves can also be regulated and controlled based on the non-reciprocal coupling between a single magnetic medium and a conventional waveguide structure, wherein the single magnetic medium has the non-reciprocity and only supports a unidirectional mode, and the waveguide structure provides a guided wave mode. When the electromagnetic wave in the waveguide interacts with the magnetic medium, the mode supported by the magnetic medium has one-way selectivity, so that the nonreciprocal coupling transmission of electromagnetic energy is realized, and the electromagnetic wave in different directions has the characteristic of selective coupling.
However, the above techniques have the following disadvantages: (1) the coupling device for regulating and controlling the nonreciprocal transmission of the electromagnetic waves is designed based on a special guided wave system, the working frequency of the coupling device is mainly concentrated on an optical band, most of the current work focuses on the analysis from phenomena to theory, the design and implementation of the coupling device are still required to be further explored and perfected from the perspective of practical feasibility, and the inherent periodic structure is difficult to realize the miniaturization design of the device; (2) the magneto-optical photonic crystal system formed by a magnetic medium is used for realizing the non-reciprocal coupling up-and-down filtering of electromagnetic waves, the frequency band of the non-reciprocal coupling unidirectional transmission effect is single at present, the performance regulation and control of the unidirectional transmission effect cannot be realized, the electromagnetic energy loss is large, and the energy transmission efficiency is low; (3) the unidirectional transmission of electromagnetic waves can also be regulated and controlled based on the nonreciprocal coupling between a single magnetic medium and a conventional waveguide structure, the unidirectional transmission frequency band is narrow, the electromagnetic energy regulation and control mode is single, and the flexible regulation and control of the electromagnetic energy cannot be realized.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a non-reciprocal coupler based on artificial surface plasmons.
The technical problem proposed by the invention is solved as follows:
a non-reciprocal coupler based on artificial surface plasmons is of a vertically, longitudinally and horizontally symmetrical structure and comprises four metal ground planes, four square-ring ferrites and two internal artificial surface plasmon waveguides;
the four metal ground planes have the same structure and are divided into two groups, namely two first metal ground planes 1 and two second metal ground planes 9, wherein the two metal ground planes of each group are connected in parallel;
the four square ring ferrites have the same structure, the side wall of each square ring ferrite is covered with a side wall metal 2, and the side wall metal 2 is as high as the square ring ferrite; the inner wall is covered with metal, and the outer walls of the left and right sides are covered with metal respectively with a length of (L)1+L2) A rectangular metal of/2; l is a radical of an alcohol1And L2The lengths of the inner side wall and the outer side wall of the square ring ferrite are respectively set;
surface metals of two internal artificial surface plasmon waveguides are printed on the upper surface of the same medium substrate in parallel, and a gap is reserved between the two internal artificial surface plasmon waveguides;
the first square ring ferrite 3 and the second square ring ferrite 4 are connected in parallel, the upper surfaces of the first square ring ferrite and the second square ring ferrite are respectively superposed with the lower surfaces of the two first metal grounds 1, and the lower surfaces of the first square ring ferrite and the second square ring ferrite are positioned in a gap of the upper surfaces of the dielectric substrates; the third ring ferrite 7 and the fourth ring ferrite 8 are connected in parallel, the upper surfaces of the third ring ferrite and the fourth ring ferrite coincide with the lower surface of the dielectric substrate, and the lower surfaces of the third ring ferrite and the fourth ring ferrite coincide with the upper surfaces of the two second metal grounds 9 respectively; the side walls of the outer walls of the two parallel square ring ferrites are connected through metal;
the magnetic fields applied to the first square ring ferrite 3 and the third square ring ferrite 7 are equal in size and same in direction; the magnetic fields applied to the second square ring ferrite 4 and the fourth square ring ferrite 8 are equal in magnitude and same in direction; the magnetic fields applied to the first square ring ferrite 3 and the second square ring ferrite 4 are equal in magnitude and opposite in direction; the magnetic fields applied to the third ring ferrite 7 and the fourth ring ferrite 8 are equal in magnitude and opposite in direction.
Furthermore, the square-ring ferrite sheet is made of Yttrium Iron Garnet (YIG) material, the saturation magnetization is 1850Gs, the resonance line width is 15Oe, and the relative dielectric constant is 15.
Further, the internal artificial surface plasmon waveguide comprises surface metal and a dielectric substrate, wherein the surface metal is printed on the upper surface of the dielectric substrate; the surface metal is sequentially provided with a first coplanar waveguide, a first gradient groove conversion structure, a comb-shaped groove array structure, a second gradient groove conversion structure and a second coplanar waveguide from left to right.
Furthermore, the metal plane is rectangular, and the periphery of the rectangle is respectively chamfered.
Further, the dielectric substrate had a relative dielectric constant of 2.65 and a tangent loss of 0.001.
Further, let the left port of the first internal artificial surface plasmon waveguide be port1, and the right port be port 4; let the left port of the second internal artificial surface plasmon waveguide be port2 and the right port be port 3;
when a forward magnetic field is applied to the first square ring ferrite (3) and the third square ring ferrite (7) and a reverse magnetic field is applied to the second square ring ferrite (4) and the fourth square ring ferrite (8), an SSPPs (spherical surface plasmon polaritons) wave input from a left port of the internal artificial surface plasmon waveguide is coupled with an SMPs (surface plasmon polaritons) wave, energy is propagated along a channel of the square ring ferrite and finally transmitted to a right cross-coupled port (namely, a signal is input from a port1, output from a port3, output from a port2 and output from a port 4); the SSPPs wave input from the right port (port3 or port4) is not coupled with the SMPs wave, and the energy is transmitted along the SSPPs waveguide channel and finally transmitted to the left through port (i.e. when the signal is input from port3, the signal is output from port 2; when the signal is input from port4, the signal is output from port 1); that is, electromagnetic energy can be coupled only when input in a single direction, i.e., non-reciprocal coupling. Similarly, when the reverse magnetic field and the forward magnetic field are applied to the square ring ferrites 4 and 8 and the square ring ferrites 3 and 7 respectively, only the electromagnetic energy input from the right port (port3 or port4) realizes coupling transmission, but the electromagnetic energy input from the left port (port1 or port2) cannot be coupled, so that the coupler has the unidirectional transmission characteristic of non-reciprocal coupling.
The four same square ring ferrites are symmetrically arranged at the upper side and the lower side of the SSPPs waveguide, and two magnetic fields in different directions are applied to the two square ring ferrites at each side to provide non-reciprocal coupling of electromagnetic energy; the two square ring ferrites on each side are connected together in parallel to reduce the transmission loss of electromagnetic energy; metal sheets are attached to two sides of the square ring ferrite, so that the electromagnetic energy loss is reduced, and the transmission efficiency and isolation are improved; the metal ground plane is placed on the square ring ferrite to enhance the robustness of the transmission channel.
A sub-wavelength comb-shaped groove array structure is used for supporting the mode propagation of the SSPPs, and in order to reduce the transmission loss of the SSPPs, a gradient groove is adopted between the adjacent coplanar waveguide and the comb-shaped groove array structure for realizing impedance matching and effective mode conversion. When an external bias magnetic field is applied to the surface of the square-ring ferrite along the positive direction and the negative direction, the square-ring ferrite has SMPs with two different rotation directions. When electromagnetic energy is input from a left port of the non-reciprocal coupler, the SSPPs mode is coupled with the SMPs mode, and the electromagnetic energy can be transmitted along a plurality of channels; when electromagnetic energy is input from a right port of the non-reciprocal coupler, the SSPPs mode and the SMPs mode are not coupled, and the electromagnetic energy can be transmitted only along a single through channel; thus, electromagnetic energy enables unidirectional transmission without reciprocal coupling.
The invention has the beneficial effects that:
the nonreciprocal coupler can realize that electromagnetic energy is input from a single direction only, and has the characteristic of directional coupling; when the electromagnetic energy is input from the opposite direction, the electromagnetic energy is not coupled and can only be output along the through port. Similarly, when the magnetic field direction is switched, its transmission behavior has opposite characteristics. The non-reciprocal coupler can isolate reflected waves, protect a signal source, effectively regulate and control the transmission of electromagnetic signals, and has wide application prospects in aerospace, radar and microwave communication systems.
Drawings
FIG. 1 is a schematic diagram of a non-reciprocal coupler according to the present invention;
FIG. 2(a) is a top view of the internal structure of the non-reciprocal coupler (without metal ground), FIG. 2(b) is a top view of the metal ground, and FIG. 2(c) is a top view of the square-ring ferrite;
FIG. 3 is a diagram illustrating an electric field distribution of an embodiment when electromagnetic waves are incident from port 1;
FIG. 4 is a diagram illustrating an electric field distribution of an embodiment when electromagnetic waves are incident from port 2;
FIG. 5 is a diagram illustrating an electric field distribution of an embodiment when electromagnetic waves are incident from port 3;
FIG. 6 is a diagram illustrating an electric field distribution of an embodiment when electromagnetic waves are incident from port 4;
FIG. 7 is a graph of S parameter when electromagnetic waves are incident from port1 in the embodiment;
fig. 8 is a graph of S-parameter when electromagnetic waves are incident from port3 in the embodiment.
Detailed Description
The invention is further described below with reference to the figures and examples.
The embodiment provides a non-reciprocal coupler based on artificial surface plasmons, the overall structural schematic diagram of which is shown in fig. 1, the coupler is in a vertically, longitudinally and horizontally symmetrical structure, and comprises four metal ground planes, four square ring ferrites and two internal artificial surface plasmons (SSPPs) waveguides;
the top views of the four metal ground planes are shown in fig. 2(b), the structures of the four metal ground planes are the same, the four metal ground planes are divided into two groups, two first metal ground planes 1 and two second metal ground planes 9, and the two metal ground planes of each group are connected in parallel; the metal plane is rectangular, and the periphery of the rectangle is respectively chamfered. The length L of the metal ground plane is 49mm, and the width W is 41 mm.
The top view of the four square ring ferrites is shown in fig. 2(c), the structure is the same, the side walls of the square ring ferrites are covered with side wall metals 2 and 6, and the side wall metals 2 and 6 are as high as the square ring ferrites; the inner wall is covered with metal, and the outer walls of the left and right sides are covered with metal respectively with a length of (L)1+L2) A rectangular metal of/2; l is1And L2The lengths of the inner side wall and the outer side wall of the square ring ferrite are respectively set; the square ring ferrite sheet is made of Yttrium Iron Garnet (YIG) material, the saturation magnetization is 1850Gs, the resonance line width is 15Oe, and the relative dielectric constant is 15. The lengths of the inner side wall and the outer side wall of the square ring ferrite are L respectively123.5mm and L2＝13.4mm。
In the present embodiment, a top view of an internal structure (without metal ground) of the non-reciprocal coupler is shown in fig. 2(a), where the internal artificial surface plasmon waveguide includes a surface metal and a dielectric substrate, and the surface metal is printed on an upper surface of the dielectric substrate; the surface metal is sequentially provided with a first coplanar waveguide, a first gradient groove conversion structure, a comb-shaped groove array structure, a second gradient groove conversion structure and a second coplanar waveguide from left to right. Surface metal is printed on the upper surface of the same medium substrate in parallel, and a gap is reserved in the middle of the surface metal; the dielectric substrate had a relative dielectric constant of 2.65 and a tangent loss of 0.001.
The first square ring ferrite 3 and the second square ring ferrite 4 are connected in parallel, the upper surfaces of the first square ring ferrite and the second square ring ferrite are respectively superposed with the lower surfaces of the two first metal grounds 1, and the lower surfaces of the first square ring ferrite and the second square ring ferrite are positioned in a gap of the upper surfaces of the dielectric substrates; the third ring ferrite 7 and the fourth ring ferrite 8 are connected in parallel, the upper surfaces of the third ring ferrite and the fourth ring ferrite coincide with the lower surface of the dielectric substrate, and the lower surfaces of the third ring ferrite and the fourth ring ferrite coincide with the upper surfaces of the two second metal grounds 9 respectively; and the side wall metal of the outer wall of the two parallel square ring ferrites is connected.
The magnetic fields applied to the first square ring ferrite 3 and the third square ring ferrite 7 are equal in size and same in direction; the magnetic fields applied to the second square ring ferrite 4 and the fourth square ring ferrite 8 are equal in magnitude and same in direction; the magnetic fields applied to the first square ring ferrite 3 and the second square ring ferrite 4 are equal in magnitude and opposite in direction; the magnetic fields applied to the third ring ferrite (7) and the fourth ring ferrite (8) are equal in magnitude and opposite in direction.
By applying a constant magnetic field H-1000 Oe on the ferrite, unidirectional transmission of electromagnetic waves incident from different ports is realized by utilizing the unidirectional SMPs mode and the coupling effect of the unidirectional SMPs mode and the SSPPs waveguide.
Let the left port of the first internal artificial surface plasmon waveguide be port1 and the right port be port 4; let the left port of the second internal artificial surface plasmon waveguide be port2 and the right port be port 3. Electromagnetic simulation software is utilized to simulate E when electromagnetic waves are input along different ports of the coupler of the embodiment at 9GHzzThe directional electric field distribution, and the arrows indicate the directions of electromagnetic energy input and output, can more clearly show the working principle thereof as shown in fig. 3-6.
As shown in fig. 3, when electromagnetic energy is input from port1, since the lower ring applies a bias magnetic field in a forward direction, the SSPPs mode can be coupled with the SMPs mode on the surface of the lower ring, so that most of the electromagnetic energy on the SSPPs waveguide is coupled on the surface of the lower ring and transmitted in a counterclockwise direction, whereas the upper ring applying a bias magnetic field in a reverse direction supports the coupling in a reverse mode, so that the electromagnetic wave coupled on the surface of the lower ring is transmitted to the upper ring in a counterclockwise direction, and the electromagnetic wave reaching the surface of the upper ring is transmitted in a clockwise direction and coupled with the SSPPs waveguide, so that the electromagnetic wave is transmitted to port 3. The transfer of electromagnetic energy from port1 to cross-coupled port3 is enabled; similarly, due to the symmetry of its non-reciprocal coupler structure, when electromagnetic waves are input from port2, the two modes couple, resulting in electromagnetic energy being output from cross-coupled port4, as shown in fig. 4. However, when electromagnetic waves are input from the opposite port3, electromagnetic energy is transmitted along the SSPPs waveguide to the through port2 output as shown in fig. 5, since the wave vector of the SSPPs mode is opposite to the wave vector of the unidirectional SMPs mode and the two modes cannot be coupled; similarly, for electromagnetic waves input from port4, the two modes are not coupled, resulting in electromagnetic energy output from through port1, as shown in fig. 6. From the distribution condition of the field, the electromagnetic energy when the port is incident from the left side can realize directional coupling, the electromagnetic energy when the port is incident from the right side can only be transmitted along the SSPPs waveguide, and the electromagnetic energy can realize the non-reciprocal coupled one-way transmission characteristic. When the directions of the bias magnetic fields applied by the upper and lower rings are switched, the transmission characteristics of the electromagnetic waves are just opposite to the above case.
Fig. 7 shows the change of the S-parameter curve when the electromagnetic wave enters from port1, and it can be seen from the graph that the return loss is greater than 10dB, the isolation is greater than 15dB, and the insertion loss is less than 5dB between 8.8GHz and 9.2 GHz. FIG. 8 shows the variation of S-parameter curve when electromagnetic wave is incident from port2, and the insertion loss is greater than 1dB, the return loss is greater than 15dB, and the isolation is greater than 28dB in the frequency range of 8.5-10.5 GHz. This shows that the plasmon non-reciprocal coupler has excellent performances of high isolation and low insertion loss.
The coupler of the embodiment utilizes the comb-shaped groove array structure and the dielectric substrate as the transmission structure of the SSPPs, and the excellent performance of the SSPPs has important application in microwave and millimeter wave bands. The SSPPs transmission line has sub-wavelength width, the field intensity is exponentially attenuated on an interface vertical to the propagation direction, and the sub-wavelength bound transmission is realized. The functional device formed by the ultrathin structure can effectively and locally transmit electromagnetic waves in a very small sub-wavelength region, so that the size is reduced to a great extent; due to the fact that SMPs in different directions are generated by the upper ring structure and the lower ring structure, different coupling characteristics are generated when electromagnetic energy is input from the front direction to the back direction, and a non-reciprocal coupler is achieved; in terms of processing technology, the planar guided wave structure can be processed by adopting the existing PCB technology, and is convenient to process; in a certain working frequency range, when electromagnetic waves are input from different ports, the electromagnetic wave coupling device shows good non-reciprocal transmission characteristics, and has the characteristics of directional coupling, simple structure, easiness in design, miniaturization and the like.
The above description is a preferred embodiment of the present invention and should not be taken as limiting the invention, but rather as the invention is susceptible to modification and variation within the spirit and scope of the present invention.
Claims (7)
1. A non-reciprocal coupler based on artificial surface plasmons is characterized by being of a vertically, longitudinally and horizontally symmetrical structure and comprising four metal ground planes, four square ring ferrites and two internal artificial surface plasmon waveguides;
the four metal ground planes have the same structure and are divided into two groups, namely two first metal ground planes (1) and two second metal ground planes (9), wherein the two metal ground planes of each group are connected in parallel;
the four square ring ferrites have the same structure, the side wall of each square ring ferrite is covered with a side wall metal (2), and the side wall metal (2) is as high as the square ring ferrite; the inner wall is covered with metal, and the outer walls of the left and right sides are covered with metal respectively with a length of (L)1+L2) A rectangular metal of/2; l is1And L2The lengths of the inner side wall and the outer side wall of the square ring ferrite are respectively set;
surface metals of the two internal artificial surface plasmon waveguides are printed on the upper surface of the same dielectric substrate in parallel, and a gap is reserved between the two internal artificial surface plasmon waveguides;
the first square ring ferrite (3) and the second square ring ferrite (4) are connected in parallel, the upper surfaces of the first square ring ferrite and the second square ring ferrite are respectively superposed with the lower surfaces of the two first metal grounds (1), and the lower surfaces of the first square ring ferrite and the second square ring ferrite are positioned in a gap of the upper surface of the dielectric substrate; the third ring ferrite (7) and the fourth ring ferrite (8) are connected in parallel, the upper surface of the third ring ferrite coincides with the lower surface of the dielectric substrate, and the lower surface of the third ring ferrite coincides with the upper surfaces of the two second metal grounds (9) respectively; the side walls of the outer walls of the two parallel square ring ferrites are connected through metal;
the magnetic fields applied to the first square ring ferrite (3) and the third square ring ferrite (7) are equal in size and same in direction; the magnetic fields applied to the second square ring ferrite (4) and the fourth square ring ferrite (8) are equal in size and same in direction; the magnetic fields applied to the first square ring ferrite (3) and the second square ring ferrite (4) are equal in magnitude and opposite in direction; the magnetic fields applied to the third ring ferrite (7) and the fourth ring ferrite (8) are equal in size and opposite in direction;
when a forward magnetic field is applied to the first square ring ferrite (3) and the third square ring ferrite (7) and a reverse magnetic field is applied to the second square ring ferrite (4) and the fourth square ring ferrite (8), the SSPPs wave input from the left port of the internal artificial surface plasmon waveguide is coupled with the SMPs wave, and energy is transmitted along the channel of the square ring ferrite and finally transmitted to the right port; the SSPPs wave input from the right port of the internal artificial surface plasmon waveguide is not coupled with the SMPs wave, and the energy is transmitted along the internal artificial surface plasmon waveguide and finally transmitted to the left port; that is, electromagnetic energy can be coupled only when it is input in a single direction.
2. The artificial surface plasmon-based non-reciprocal coupler of claim 1, wherein the square ring ferrite plate is made of yttrium iron garnet-type material, and has a saturation magnetization of 1850Gs, a resonance line width of 15Oe, and a relative dielectric constant of 15.
3. The artificial surface plasmon based non-reciprocal coupler of claim 1 wherein the internal artificial surface plasmon waveguide comprises a surface metal and a dielectric substrate, the surface metal being printed on the upper surface of the dielectric substrate; the surface metal is sequentially provided with a first coplanar waveguide, a first gradient groove conversion structure, a comb-shaped groove array structure, a second gradient groove conversion structure and a second coplanar waveguide from left to right.
4. The artificial surface plasmon based non-reciprocal coupler of claim 1 wherein the metal plane is rectangular and the perimeter of the rectangle is chamfered.
5. The artificial surface plasmon based non-reciprocal coupler of claim 1, wherein the dielectric substrate has a relative dielectric constant of 2.65 and a tangent loss of 0.001.
6. The artificial surface plasmon-based non-reciprocal coupler of claim 1 wherein the metal ground plane has a length L of 49mm and a width W of 41 mm.
7. The artificial surface plasmon based non-reciprocal coupler of claim 1, wherein the lengths of the inner and outer sidewalls of the square-ring ferrite are L, respectively123.5mm and L2＝13.4mm。
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