CN109768383A - A Circularly Polarized Antenna Based on Double-layer Artificial Surface Plasmon Transmission Line Phase Shifting - Google Patents
A Circularly Polarized Antenna Based on Double-layer Artificial Surface Plasmon Transmission Line Phase Shifting Download PDFInfo
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Abstract
本发明属于天线技术领域，公开了一种基于双层人工表面等离激元传输线移相的圆极化天线，包括：一个辐射器和一个金属反射板；辐射器放置在地板上方；辐射器包括一个由人工表面等离激元波导和平行双线传输线组成的功率分配网络和由四个存在相互耦合的偶极子构成的辐射结构组成；辐射器都印制在双层覆铜介质板上。与传统的平行双线同时应用，设计出了在微波频段具有高效传输和移向功能的功率分配器，再使用该功率分配器激励四个紧耦合偶极子，形成圆极化辐射。并进行了全波电磁仿真和加工测试，验证了该天线在所设计的频段内能够实现圆极化辐射。本发明具有结构简单，无需额外延时线结构、结构尺寸小、质量轻和易加工等特点，有着广阔的应用前景。
The invention belongs to the technical field of antennas, and discloses a circularly polarized antenna based on double-layer artificial surface plasmon transmission line phase shifting, comprising: a radiator and a metal reflector; the radiator is placed above the floor; the radiator includes A power distribution network composed of artificial surface plasmon waveguides and parallel bifilar transmission lines and a radiation structure composed of four mutually coupled dipoles; the radiators are all printed on a double-layer copper-clad dielectric board. Simultaneously applied with the traditional parallel double line, a power divider with efficient transmission and direction shifting functions in the microwave frequency band is designed, and then the power divider is used to excite four tightly coupled dipoles to form circularly polarized radiation. The full-wave electromagnetic simulation and processing test are carried out to verify that the antenna can achieve circularly polarized radiation in the designed frequency band. The invention has the characteristics of simple structure, no need for additional delay line structure, small structure size, light weight and easy processing, etc., and has broad application prospects.
Description
Technical field
The invention belongs to antenna technical fields, more particularly to one kind to be based on the transmission line phase shift of double-layer artificial surface phasmon
Circular polarized antenna.
Background technique
Currently, the prior art commonly used in the trade is such that surface phasmon (surface plasmon
Polaritons, SPPs) it is a kind of surface electromagnetic wave, it is derived according to maxwell equation group it is found that it is present in dielectric constant
On opposite two media interface.Since in visible light frequency band, metal has negative dielectric constant, internal free electron
In plasma state, so there is surface phasmons under natural conditions in metal surface.But at lower frequencies, such as
Microwave frequency band, metal show as perfect electric conductor rather than plasma.In order to following excitating surface of infrared frequency etc. from swash
The concept of member, plasma Meta Materials is come into being.Existing research proves that a kind of ultra-thin plasma ripple structure can be
Microwave and terahertz wave band support the surface phasmon for being similar to visible light frequency band to transmit, and referred to as artificial surface etc. is from sharp
Member.Based on this theory, many microwave devices, such as filter, circulator are suggested.In addition to microwave device, many antennas also by
It designs, the characteristic from primitive such as artificial surface is utilized, leaky-wave antenna and travelling-wave aerial are suggested.But these days
Line is all linear polarized antenna.Linear polarized antenna is due to the polarization matching in a communications system for transmitting antenna and receiving antenna
It is required that stringent, application range is limited, and circular polarized antenna can be matched with lower polarization and require work, can have been widened and answered significantly
Use range.Due to everybody the transmission performance of artificial surface phasmon is paid close attention to it is more, about having used artificial surface
The antenna of the circular polarisation of phasmon almost without.Circular polarized antenna proposed by the present invention has widened artificial surface etc. from sharp significantly
Application of the member in field of antenna.
In conclusion problem of the existing technology is: existing antenna is all linear polarized antenna, artificial about having used
The antenna of the circular polarisation of surface phasmon almost without.
Solve above-mentioned technical problem difficulty and meaning: circular polarization radiation formed because being known as three: be two width first
Spend equal electromagnetism wave vector；Followed by the space of the two vectors is directed toward and is mutually perpendicular to；It is finally the phase of the two vectors
90 degree of difference.Two transmission lines for functioning as power divider of artificial surface phasmon in the present invention, are being distributed
It is shifted to while energy, simplifies feed structure, eliminate delay line.
Summary of the invention
In view of the problems of the existing technology, the present invention provides one kind to be based on double-layer artificial surface phasmon transmission line
The circular polarized antenna of phase shift.
The invention is realized in this way a kind of circular polarisation day based on double-layer artificial surface phasmon transmission line phase shift
Line, the circular polarized antenna based on double-layer artificial surface phasmon transmission line phase shift includes: a radiator and a gold
Belong to reflecting plate；
Radiator is placed on above floor；
Radiator includes the power distributing network being made of the waveguide of artificial surface phasmon and parallel double-conductor transmission line
Network and the irradiation structure constituted by four in the presence of the dipole to intercouple form；
Radiator is all printed on bilayer copper clad dielectric-slab.
Further, the power distributing network includes five ports, an input port and four output ports；
The identical artificial surface phasmon waveguide of both ends physical length and parallel double-conductor transmission line,；Two output ports
There are 90 degree of phase difference outputs with other two output port.
Further, the dispersion curve of artificial surface phasmon unit and parallel double-conductor transmission line unit, specific parameter
P, w2, a, h.Wherein p is the length of each SSPP unit, w2It is the length of SSPP unit, a and h are the slot of SSPP unit respectively
Width and depth.
Further, power divider includes an input port and four output ports, and input port is located at total
Geometric center, four outputs are divided into two groups.
Another object of the present invention is to provide be based on double-layer artificial surface phasmon transmission line described in a kind of application to move
The wireless communication system of the circular polarized antenna of phase.
In conclusion advantages of the present invention and good effect are as follows: artificial surface based on the double-deck ripple struction etc. is from primitive
Transmission waveguide can realize the galvanomagnetic-effect similar from primitive with the surface of naturally occurring under optics frequency range etc. in microwave frequency band,
As dispersion and high field fetter effect.The popularity of its application is enhanced by common parallel wire mapped structure, and can
Realize that there are computable phase differences with the parallel wire of same physical length.Power distributing network is able to achieve constant power, phase
(two groups) of the 4 ports output of 90 degree of difference.Four coupled dipoles of centimetre network activation, are able to achieve the stable circle of directional diagram
Polarized radiation.
The present invention utilizes the dispersion characteristics of eigen mode ANALYSIS OF CALCULATING bilayer ripple struction, and simulated optical frequency range is deposited naturally
Artificial surface phasmon, pass through building parallel wire excitation transition structure；It is applied simultaneously with traditional parallel wire,
Having devised has high efficiency of transmission in microwave frequency band and shifts to the power divider of function, reuses power divider excitation four
A coupled dipole forms circular polarization radiation.And full-wave electromagnetic emulation and processing test are carried out, the antenna is demonstrated set
It can be realized circular polarization radiation in the frequency range of meter.The circular polarized antenna has structure simple, without additional delay cable architecture, structure
Size is small, light weight and the features such as easy processing, has broad application prospects in novel circular polarized antenna field.
Novel manual electromagnetic material of the invention refers to a kind of with extraordinary physical property not available for natural medium
Artificial composite structure or Composite Media reach the mesh of control material electromagnetic property by changing cellular construction and its space arrangement
's.By its cellular construction of engineer, it can control the electricity such as effective dielectric constant, magnetic conductivity, refractive index, the wave impedance of material
Magnetic parameter realizes the property that material existing for nature does not have.
Compared with prior art, advantage of the invention is:
1, the present invention realizes the artificial surface phasmon transmission form of microwave frequency band using double-deck ripple intersection construction.
Field containment effect is obvious, is conducive to integrated low crosstalk artificial surface phasmon device circuitry.
2, structure is simple, easy to process, at low cost, light-weight.Circular polarized antenna proposed by the present invention, using balanced twin lead
With the feed structure of artificial surface phasmon waveguide composition, structure is simple, does not need the phase delay line of the length of additional λ/4
Structure, easy to process, processing cost is low.
3, the present invention uses simple structure, realizes wide impedance bandwidth and wider 3-dB axial ratio bandwidth, it is shown that
The high performance nature in its broadband.
4, the dipole in the present invention, to intercouple is used as radiator, due to coupled characteristic, in broadening antenna
While, make antenna resonance in f0Under frequency, it is compared to original high resonance frequency, completes the miniaturization of antenna.
Detailed description of the invention
Fig. 1 is the circular polarized antenna provided in an embodiment of the present invention based on double-layer artificial surface phasmon transmission line phase shift
Structural schematic diagram；
Fig. 2 be the double-deck ripple struction provided in an embodiment of the present invention artificial surface phasmon Wave guide unit and parallel pair
The dispersion curve contrast schematic diagram of line unit.
Fig. 3 is the specific structure of power splitter provided in an embodiment of the present invention and port illustrates and simulation result schematic diagram.
Fig. 4 is the S parameter of circular polarized antenna provided in an embodiment of the present invention, axis ratio and gain results schematic diagram.
Fig. 5 is the gain results of circular polarized antenna provided in an embodiment of the present invention and the antenna pattern in center frequency point.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The present invention transmits electromagnetic energy using double-layer artificial surface phasmon transmission line structure, and with common parallel pair
Line transmission line is applied jointly, and design one is able to achieve the output port of four constant powers, 90 degree of phase phase difference；Reuse function
Subnetwork motivates four coupled dipoles, realizes circular polarization radiation.Electromagenetic wave radiation for microwave frequency band.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, the entelechy provided in an embodiment of the present invention based on double-layer artificial surface phasmon transmission line phase shift
Changing antenna includes: a radiator 1 and a metallic reflection plate 2.
Radiator 1 is placed on the top of metallic reflection plate 2, radiator 1 include one by the waveguide of artificial surface phasmon and
The power distributing network of parallel double-conductor transmission line composition and the irradiation structure group constituted by four in the presence of the dipole to intercouple
At.Power distributing network includes five ports, an input port and four output ports.Both ends physical length is identical artificial
Surface plasmon waveguide and parallel double-conductor transmission line realize two output ports and another due to the difference of unit dispersion characteristics
There can also be 90 degree of phase difference output while outer two output ports output power having the same.Four pass through ripple knot
Structure is realized that the dipole of coupling is placed on four output ports of power splitter and is motivated, and realizes circular polarization radiation.Radiator is all
It is printed directly on a bilayer copper clad dielectric-slab.
Fig. 1 is specific structure and parameter of the invention.The radiator and a gold that antenna is printed on dielectric-slab by one
Possession plate is constituted.Wherein radiator includes a power division network based on artificial surface phasmon and parallel double-conductor transmission line,
Four dipoles to intercouple are motivated respectively by four ports of power division network.The major parameter of antenna: h0, w0, w3, w4,
D_w, d_l, w1.Wherein h0It is distance of the irradiation structure apart from metallic reflection plate, w0It is the side length of metallic reflection plate, w3It is coupling
Partial width, w4It is the length for coupling minor matters, d_w is the width of dipole, and d_l is the idol including coupling minor matters part
Extremely sub length, w1It is the width of parallel double-conductor transmission line.
Fig. 2 is the dispersion curve of the artificial surface phasmon unit and parallel double-conductor transmission line unit in the present invention, by
It is acted in the constraint of artificial surface phasmon, under identical frequency, two kinds of units have different wave numbers, using this feature,
Designed antenna can realize circular polarization radiation without using additional delay line.Specific parameter p, w2, a, h.Wherein p is
The length of each SSPP unit, w2It is the length of SSPP unit, a and h are the width and depth of the slot of SSPP unit respectively.
Fig. 3 is power divider used in the present invention.The power divider includes that an input port and four are defeated
Exit port, input port are located at the geometric center of total, and four outputs can be divided into two groups of (port 2 and 3,4 Hes of port
5)；Two groups of ports are able to achieve the output signal of approximately equal power and 90 degree of phase phase difference.
Fig. 4 gives the S parameter of antenna of the present invention, axis ratio and gain results.The result shows that antenna realizes
One very wide impedance bandwidth and wider axial ratio bandwidth.Show the antenna can work in a very wide frequency range with
And the circular polarization radiation of constant gain can be realized in a wider frequency range.
Fig. 5 gives antenna pattern of the circular polarized antenna at the center frequency point of working band.It can be seen that antenna
There are low cross polarization and wider radiation beam in the antenna pattern of the point.
Application effect of the invention is explained in detail below with reference to emulation.
The present invention utilizes the dispersion characteristics of eigen mode ANALYSIS OF CALCULATING bilayer ripple struction, and simulated optical frequency range is deposited naturally
Artificial surface phasmon, pass through building parallel wire excitation transition structure；It is applied simultaneously with traditional parallel wire,
Having devised has high efficiency of transmission in microwave frequency band and shifts to the power divider of function, reuses power divider excitation four
A dipole to intercouple forms quadrature in phase, and amplitude is equal, two orthogonal electric-field vector components of direction, to meet
The formation requirement of circular polarisation, forms circular polarization radiation.And full-wave electromagnetic emulation and processing test are carried out, the antenna is demonstrated in institute
It can be realized circular polarization radiation in the frequency range of design.The circular polarized antenna has structure simple, is not necessarily to additional delay cable architecture,
Novel circular polarized antenna field has broad application prospects.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (5)
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| CN110311214A (en) * | 2019-06-10 | 2019-10-08 | 西安电子科技大学 | Broadband High Isolation Dual Circularly Polarized Antenna Based on Single Layer Artificial Surface Plasmons |
| CN111082288A (en) * | 2019-12-31 | 2020-04-28 | 首都师范大学 | Terahertz wave generating device based on 1550nm laser |
| CN112162160A (en) * | 2020-09-15 | 2021-01-01 | 武汉凡谷电子技术股份有限公司 | Testing method of Massive MIMO AFU |
| CN114336090A (en) * | 2021-11-30 | 2022-04-12 | 北京交通大学 | An artificial surface plasmon-fed dual-polarized patch antenna array |
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| CN110311214A (en) * | 2019-06-10 | 2019-10-08 | 西安电子科技大学 | Broadband High Isolation Dual Circularly Polarized Antenna Based on Single Layer Artificial Surface Plasmons |
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| CN112162160A (en) * | 2020-09-15 | 2021-01-01 | 武汉凡谷电子技术股份有限公司 | Testing method of Massive MIMO AFU |
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| CN114336090A (en) * | 2021-11-30 | 2022-04-12 | 北京交通大学 | An artificial surface plasmon-fed dual-polarized patch antenna array |
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