A kind of uncoupling array antenna based on double frequency Meta MaterialsTechnical field
The present invention relates to a kind of uncoupling array antenna based on double frequency Meta Materials, belongs to Meta Materials and aerial array decouplingThe fields such as conjunction.
Background technology
With the continuous development of the communication technology, mobile communication technology turns into important shifting indispensable in our actual livesThe dynamic communication technology.At present, mobile communication technology is to 5G era developments, so new want will necessarily be proposed to the communication technologyAsk, following communication system will integrate various communications protocols in the same apparatus.Therefore, multiple communication systems are integrated simultaneouslyIn an equipment, a new requirement is proposed to Antenna Design, the design of antenna is faced huge challenge.According to thisThinking, during designing antenna, it is necessarily required to the requirement for meeting multi-band communication.According to traditional Antenna Design, traditional design sideFormula is to combine multiple single-band antennas together, realizes the demand of multiband, not only needs to carry out the redesign of various antennas,And the volume of antenna is larger, it is not easy to integrate, adds debugging difficulty.Therefore, common antenna is designed, it is desirable to which it can be simultaneouslyMeet that multifrequency protocol communication demand has become the Developing mainstream of Antenna Design of future generation, it is so, same with common antenna canWhen meet the requirement of multiple communication systems, and may be directly applied to other communication systems and choose.So antenna is small-sizedChange, multi-functional, multiband, versatility, be easily integrated trend of the chemical conversion for future antenna developing direction.Compared to ordinary antennasSpeech, array antenna have higher gain, can improve the directionality of radiation field, be widely used in radar, channel radioThe fields such as letter.Coupling in aerial array between bay, the performance of array antenna can be not only reduced, and so that day can be reducedThe gain of the battle array of line, deteriorate radiation characteristic.Between array antenna array element coupling turn into influence array antenna performance it is crucial becauseElement.Therefore, how to reduce the coupling between array antenna array element turns into the important hot subject of current array Antenna DesignOne of.
Microstrip antenna is more most common a kind of antenna in modern antenna design, because its design is simple, is easily integrated,The characteristics of spatial area is smaller, it is widely used in antenna array design.The decoupling mode of array antenna mainly hasAddition neutralizes line, parasitic element mode, defect ground structure, electro-magnetic bandgap technology, and Meta Materials technology.Array based on Meta MaterialsAntenna uncoupling technology is a technology just risen.Meta Materials refer to the extraordinary electricity not available for a kind of nature materialThe artificial composite structure or material of magnetic characteristic, and there is negative permittivity, either negative magnetoconductivity or to be provided simultaneously with multiple dielectric normalNumber and magnetic conductivity.When being provided simultaneously with negative permittivity and negative magnetoconductivity, negative index feature will be presented in Meta Materials.We canWith the physical size by adjusting metamaterial modular construction, the physics not available for common material can be realized in certain frequency rangeCharacteristic.Because artificial electromagnetic Meta Materials have the person's character of resonance, therefore, we can set when design to structureMeter, ohmic loss and dielectric loss near resonant frequency are adjusted, the absorption to incident electromagnetic wave is realized, so as to improve antennaIsolation between array element.The present invention is based on this characteristic of Meta Materials, and devising a in double frequency-band while can goThe micro-strip array antenna of coupling.Due to specific physical phenomenon possessed by Meta Materials, so the application and research of Meta Materials haveImmeasurable prospect.
The content of the invention
The present invention is directed to the deficiency of current array antenna uncoupling, there is provided a kind of uncoupling array based on double frequency Meta MaterialsAntenna.
The object of the present invention is achieved like this：
A kind of uncoupling array antenna based on double frequency Meta Materials, including：Common ground plate 1, medium substrate 8, left side squareShape opening radiation patch 2, right rectangular opening radiation patch 3, left side coaxial feed port 4, right side coaxial feed port 5, a left sideSide double frequency metamaterial structure 6 and right side double frequency metamaterial structure 7；Characterized in that, the common ground plate 1 is rectangular, left sideCoaxial feed port 4 and right side coaxial feed port 5 are arranged symmetrically on common ground plate 1；The left side rectangular aperture radiationPaster 2 and right rectangular opening radiation patch 3 are square, and its one side is provided with rectangular indentation；Left side rectangular aperture radiationPaster 2 and right rectangular opening radiation patch 3 are arranged symmetrically, and respectively with left side coaxial feed port 4 and right side coaxial feedPort 5 coordinates；Formed between left side rectangular aperture radiation patch 2 and right rectangular opening radiation patch 3 and common ground plate 1Space medium substrate 8 is filled；Left side double frequency metamaterial structure 6 and right side double frequency metamaterial structure 7 are arranged symmetrically in medium baseOn plate 8, and between left side rectangular aperture radiation patch 2 and right rectangular opening radiation patch 3.
Described left side rectangular aperture radiation patch 2 and right rectangular opening radiation patch 3 and described left side double frequencyMetamaterial structure 6 and right side double frequency metamaterial structure 7, which use, covers steel structure.Left side rectangular aperture radiation patch 2 and right side squareThe distance between adjacent edge is 12mm to shape opening radiation patch 3 in the horizontal direction.
Material is the FR4 that dielectric constant is 4.4 used by described medium substrate 8；Medium substrate 8 is rectangular, and withThe vertical one side of double frequency metamaterial structure is 2mm to the distance of double frequency metamaterial structure end points, and another side radiates with rectangular apertureAt a distance of 2mm on the outside of paster.
Left side double frequency metamaterial structure 6 and right side double frequency metamaterial structure 7 are made up of 8 metamaterial units respectively；It is describedMetamaterial unit include：Split ring resonator 10, clock wise spirals structure 9 and counter-clockwise helical structure 11；Described opening is humorousThe ring 10 that shakes is rectangular, and is provided with opening；Clock wise spirals structure 9 and counter-clockwise helical structure 11 are arranged in split ring resonator 10Portion, and the starting point of clock wise spirals structure 9 and counter-clockwise helical structure 11 is relative with opening with split ring resonator 10 respectivelyWhile it is connected；8 described metamaterial units are linearly arranged, and the equal court of opening of the split ring resonator 10 of 8 metamaterial unitsTo center.
Beneficial effects of the present invention：It is designed based on micro-strip antenna array, using Jie between array antenna array elementThe row of etching two are along the lateral symmetry double frequency metamaterial structure of medium substrate on matter substrate, reduce and couple between array antenna array element,Improve the performance of array antenna.
Brief description of the drawings
Fig. 1 is the front view of the present invention；
Fig. 2 is the side view of the present invention；
Fig. 3 is the structural representation of the metamaterial unit of the present invention；
Fig. 4 is the reflectance factor result figure of the present invention；
Fig. 5 is the transmission coefficient result figure of the present invention.
Embodiment
The present invention is described in further details with embodiment below in conjunction with the accompanying drawings.
As depicted in figs. 1 and 2, the present invention includes common ground plate 1, medium substrate 8, left side rectangular aperture radiation patch 2With right rectangular opening radiation patch 3, left side coaxial feed port 4 and right side coaxial feed port 5, rectangular aperture radiation patchBetween medium substrate on etching left side double frequency metamaterial structure 6 and right side double frequency metamaterial structure 7, left side double frequency Meta Materials knotStructure 6 and right side double frequency metamaterial structure 7 are made up of 8 metamaterial units respectively, and left side double frequency metamaterial structure 6 and right side are doubleThe vertically parallel arranged of frequency metamaterial structure 7.Left side coaxial feed port 4 and right side coaxial feed port 5 are right in left and rightClaim distribution, for 16 metamaterial units using the helical structure form nested with split ring resonator, it is humorous that helical structure is nested in openingShake inside ring 10.8 Meta Materials lists above in left side double frequency metamaterial structure 6 and right side double frequency metamaterial structure 7 as shown in Figure 1Member is as shown in graph structure Fig. 3, in normal branch, below 8 metamaterial units in 180 ° of mirror images.Fig. 3 is metamaterial unit knotThere is an opening structure, the top of split ring resonator 10, and internal helical structure 9 uses up time needle construction, and 11 using knot counterclockwiseStructure.
Material is the FR4 that dielectric constant is 4.4 used by medium substrate 8 described in Fig. 1 and Fig. 2, medium substrateIt is longer 2mm than double frequency metamaterial structure in vertical direction, it is wider 2mm than rectangular aperture radiation patch in the horizontal direction.Left side rectangleOpening radiation patch 2 and right rectangular opening radiation patch 3 and described left side double frequency metamaterial structure 6 and right side double frequency surpassMaterial structure 7, which uses, covers steel structure.Left side rectangular aperture radiation patch 2 and right rectangular opening radiation patch 3 are in level sideThe distance between upward adjacent edge is 12mm.Two coaxial feed ports are fed by SMA directly to rectangular aperture radiation patch,SMA inner wire is directly connected with rectangular aperture radiation patch, SMA outer conductor directly and the lower surface of medium substrate public affairsEarth plate 1 is connected altogether.
As depicted in figs. 1 and 2, the uncoupling array antenna based on double frequency Meta Materials, by the upper surface of medium substrateLeft side double frequency metamaterial structure 6 and right side double frequency metamaterial structure 7 are symmetrically arranged at left side along medium substrate longitudinal axisBetween rectangular aperture radiation patch 2 and right rectangular opening radiation patch 3, for reducing the coupling between array antenna array element,The isolation of array antenna array element is improved, array antenna array element is all located at the upper table of medium substrate with Meta Materials decoupling cellular constructionFace, easy to process, cost is low, is easily integrated, and can be made using circuit board machining process.
- the 10dB of antenna reflection coefficient of power is as shown in Figure 4, it can be seen that the antenna has dual frequency characteristics, and twoIndividual frequency range has preferable bandwidth, can meet double frequency WLAN communication requirement.Fig. 5 show the transmission system of inventive antennaNumber, it can be seen that the antenna has very high isolation, and the transmission coefficient in two frequency bands is respectively less than -20dB, and most ofLess than -25dB, therefore the isolation of the antenna can reach 25dB in most working band.
In summary, the uncoupling design of the array antenna different from the past for single-frequency of the invention, but have in mindMulti-functional in future antenna, the exercisable requirement of multiband, the array antenna that one pair of design can work in double frequency-band simultaneously is goneCoupled structure, while realize double frequency-band uncoupling.By arranging that rectangular aperture radiation patch is realized in the upper surface of medium substrateDual frequency operation, while two row double frequency metamaterial structures are arranged between array antenna array element, realize that array antenna double frequency-band decouplesPurpose, the isolation of array antenna array element is greatly improved, while the present invention is used as a kind of flat plane antenna, can be integrated inIn most of communication systems, there is good application prospect.