CN106602243A - 2MIMO mobile phone antenna based on characteristic mode theory and design method thereof - Google Patents
2MIMO mobile phone antenna based on characteristic mode theory and design method thereof Download PDFInfo
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- CN106602243A CN106602243A CN201611099501.5A CN201611099501A CN106602243A CN 106602243 A CN106602243 A CN 106602243A CN 201611099501 A CN201611099501 A CN 201611099501A CN 106602243 A CN106602243 A CN 106602243A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0087—Apparatus or processes specially adapted for manufacturing antenna arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
Abstract
The invention discloses a 2MIMO mobile phone antenna based on a characteristic mode theory and a design method thereof. The antenna comprises a floor (1), a first feed structure (5), a second feed structure (6), a dielectric substrate (9), a first feed port (10), and a second feed port (11). The floor (1) is printed on the upper surface of the dielectric substrate and comprises a rectangular metal copper-clad plate (2) and two inductive loads (3, 4) which are connected with two long sides of the rectangular metal copper-clad plate respectively. High-frequency matching is achieved by a slot (7) on the second inductive load (4). The first feed structure is located at the middle of the long side of the floor, is connected to the first feed port, and achieves low-frequency matching by using a resonant circuit (8) thereon. The second feed structure is located at the edge of the short side of the floor and is connected to the second feed port. The antenna is simple in structure and easy to process, has good performance and can be used in modern wireless communication systems.
Description
Technical field
The invention belongs to communication technical field, and in particular to a kind of method for designing of 2MIMO antenna system of mobile phone, can be used for
The mobile phone of gsm communication frequency range.
Background technology
With the fast development of mobile communication business, which has driven the prosperity of wireless terminal antenna industry simultaneously.People couple
Bigger pressure is brought to this deficient frequency spectrum resource in the higher and higher demand of wireless traffic.So, money is found with all strength
The technology of source maximum utilizationization becomes research emphasis.
MIMO technology places the technology of many antennas at communication system transmit-receive end.MIMO technology can not increase transmitting
Power and on the premise of being not take up extra spectrum resource, the exponentially communication efficiency and reliability of lift system.Multiple antennas institute face
Coupled problem of the critical problem for facing i.e. between antenna, particularly with Miniature Terminal equipment such as mobile phone, in so narrow and small sky
Between to place two even more antennas be great challenge.
Solve unit between high coupling common method have built-in Decoupling network, electromagnetic belt resistance floor panel structure, parasitic element,
Plate stitch gap, neutral line etc..For example, Application No. 201610013522.4, a kind of entitled compact multi-frequency band MIMO mobile phones day
The patent document of line, spatial folding monopole construction unit that MIMO antenna for mobile phone disclosed in which is placed using four mirror images and
The mode of earth plate finger-cross structure realizes the characteristic of multiband, lower coupling and low section.Application No. 201510005862.8,
The patent document of entitled mimo antenna, discloses a kind of MIMO dual-antenna systems, and which includes the first radiating element, the second radiation
Unit and connecting portion.Wherein, connecting portion is connected between the first radiating element and the second radiating element；Arrange above connecting portion
There is the isolation channel in " H " font.Between its radiating element, isolation is preferable, it is possible to increase the degree of association of radiation signal and MIMO systems
The efficiency of system.
Using conventional uncoupling mode, its problem for existing is that quarantine measures are mainly for easy to implement to above-mentioned antenna
High frequency, for low frequency can not realize good isolation effect, and the introducing of quarantine measures causes antenna structure to become multiple
It is miscellaneous.
In recent years, character modules theory T CM causes the extensive concern of scholar in antenna for mobile phone design aspect.Using TCM not only
The mode of operation of antenna structure, and the orthogonality of its different mode design for mimo antenna can be clearly seen theoretically
Bring new thinking.Such as article " Design of Orthogonal MIMO Handset Antennas Based on
Characteristic Mode Manipulation at Frequency Bands Below 1GHz ", its feature based mould
Two orthogonal patterns by loading capacitive load structural change floor mode of operation, and are entered row energization, so as to design by theory
The MIMO antenna for mobile phone of a high-isolation；Article " MIMO Mobile Handset Antenna Merging
Characteristic Modes for Increased Bandwidth ", are equally based on the feature theory of modules, and which utilizes fence to tie
Structure and lamped element change floor mode of operation, and enter row energization to two patterns by the method for coupling excitation, so as to reality
The design of existing 2MIMO antenna system of mobile phone.These mimo antennas using character modules Design Theory, bandwidth of operation are narrower, uncomfortable
For the demand of mobile communication.
The content of the invention
Present invention aims to above-mentioned the deficiencies in the prior art, propose a kind of 2MIMO of the feature based theory of modules
The method for designing of antenna system of mobile phone, to simplify antenna structure, improves isolation effect at low frequency, and realizes wider work
Bandwidth.
For achieving the above object, technical scheme includes as follows：
One. the 2MIMO antenna for mobile phone of the feature based theory of modules, including floor, the first feed structure, the second feed structure,
Medium substrate, the first feed port and the second feed port, floor are printed on medium substrate upper surface, it is characterised in that：
The floor, used as the radiating element of antenna, which includes rectangular metal copper-clad plate, the first inductive load and the second sense
Property load, the two inductive loads are connected with two long sides of rectangular metal copper-clad plate respectively, and are provided with the second inductive load
0.5mm wide gap, to realize that high frequency is matched；
First feed structure is connected with the first feed port, and positioned at the mid portion on the long side in floor, first feedback
Electric structure is provided with resonance circuit, to realize that low frequency is matched.
Second feed structure is connected with the second feed port, and positioned at the edge portions of floor minor face.
Further, the first described inductive load includes the first thin short metal band wire, the first long and thin metal band wire and first
One of sheet metal, long side of the first long and thin metal band wire parallel to metal copper-clad plate, and the first long and thin metal band wire is long
While being connected with the first thin short metal band wire；First sheet metal is perpendicular to the long side of rectangular metal copper-clad plate, and first sheet metal
It is connected with another long side of the first long and thin metal band wire.
Further, the second described inductive load includes the second thin short metal band wire, the second long and thin metal band wire and second
One of sheet metal, long side of the second long and thin metal band wire parallel to metal copper-clad plate, and the second long and thin metal band wire is long
While being connected with the second thin short metal band wire；Second sheet metal is perpendicular to the long side of rectangular metal copper-clad plate, and second sheet metal
It is connected with another long side of the second long and thin metal band wire.
Further, the first described feed structure is a rectangular metal sheet, and which is adjustable with the first feed port position.
Further, the second described feed structure is a monopole, and its one end is the metal tape along the bending of medium upper surface
Line, the other end are to be folded upward at and be connected with the narrow metallic tapes of monopole overhanging portion along medium side edge.
Further, described resonance circuit, including a lumped capacity and two lumped inductances, three adopt parallel way
Place, and lumped capacity is located between the first lumped inductance and the second lumped inductance.
Two. the 2MIMO antenna for mobile phone methods for designing of the feature based theory of modules, comprise the steps
1) design of mobile phone floor panel structure；
The impedance matrix of one piece of rectangular metal copper-clad plate 1a) is calculated, the spy of metal copper-clad plate is extracted by the feature theory of modules
Levy modular curve；
The shape and size of rectangular metal copper-clad plate are changed 1b), to guarantee there are in required working band two features
Be worth the mode of resonance for 0, and two modes of resonance will meet designed band requirement, that is, the shape on the floor needed for obtaining and
Size；
2) optimization design of feed placement；
The feature electric field of above-mentioned two mode of resonance 2a) is extracted, and generates distribution map of the electric field, by electric field magnitude scattergram
The position of respective distributing point is set at point of maximum electric field；
3) optimization design of single antenna；
3a) feed position in any one mode of resonance is fed to produce driving voltage, when single antenna can be
Resonance is produced in required working frequency range, that is, completes the optimization design of feed structure；
Port Impedance matching is carried out to above-mentioned single antenna 3b), the bandwidth of operation needed for antenna meets completes matching knot
The optimization design of structure；
4) optimization design of 2MIMO antenna systems；
On the basis of above-mentioned single antenna, the feed position of another mode of resonance is fed to produce excitation electricity
Into second single antenna, needed for two antennas meet simultaneously during bandwidth of operation, that is, the optimization for completing 2MIMO antenna systems sets swaging
Meter.
The invention has the advantages that：
1. the present invention extracts the feature modular curve of metal copper-clad plate using the feature theory of modules, and changes rectangular metal copper-clad plate
Shape and size, obtain the mobile phone floor panel structure with two modes of resonance in required frequency range, on this basis extract two
The corresponding feature electric field of mode of resonance, and the feed position of antenna will be set at point of maximum electric field in electric field magnitude scattergram,
Compared with conventional MIMO antenna method for designing, the 2MIMO antenna for mobile phone method for designing of the present invention has higher execution efficiency, day
The feed placement and operating frequency of line flexibly can be designed.
2. the present invention is fed sharp to produce respectively using the feature theory of modules in the feed position of two modes of resonance
Voltage is encouraged, and then motivates first single antenna and second single antenna respectively, due to the orthogonality of different modes of resonance, can be made
The 2MIMO antenna for mobile phone of the present invention is realizing good isolation effect compared with low-frequency range.
3., using floor as main radiating element, antenna structure is simple, it is easy to process for the 2MIMO antenna for mobile phone of the present invention.
4. the 2MIMO antenna for mobile phone of the present invention using 0.5mm gap and lumped-circuit carry out port match, broadening antenna
Working band, improve service behaviour.
Description of the drawings
Fig. 1 is the method for designing flow chart of the present invention.
Fig. 2 is the feature modular curve of rectangular metal copper-clad plate in method for designing of the present invention.
Fig. 3 is the floor panel structure figure of antenna for mobile phone in method for designing of the present invention.
Fig. 4 is the feature modular curve on mobile phone floor in method for designing of the present invention.
Fig. 5 is the distribution map of the electric field of two modes of resonance in mobile phone floor in method for designing of the present invention.
The feed structure of single antenna in Fig. 6 methods for designing of the present invention.
Fig. 7 is the input impedance figure that single antenna does not carry out when port Impedance is matched in method for designing of the present invention.
Fig. 8 is the return loss plot that single antenna does not carry out when port Impedance is matched in method for designing of the present invention.
Fig. 9 is the enlarged drawing of single antenna port Impedance mating structure in method for designing of the present invention.
Figure 10 is single antenna input impedance figure in method for designing of the present invention.
Figure 11 is the return loss plot of single antenna in method for designing of the present invention.
Figure 12 is the enlarged drawing of the second feed structure in method for designing of the present invention.
Figure 13 is the overall structure figure of 2MIMO antenna for mobile phone of the present invention.
Figure 14 is the S parameter figure of 2MIMO antenna for mobile phone of the present invention.
Figure 15 is the directional diagram of 2MIMO antenna for mobile phone of the present invention.
Figure 16 is the envelope correlation coefficient (ECC) of 2MIMO antenna for mobile phone of the present invention.
Specific embodiment
In order that the object, technical solutions and advantages of the present invention become apparent from, below in conjunction with the drawings and specific embodiments
The present invention is described in further detail.
With reference to Fig. 1, the flow process of the present invention is as follows：
Step 1, designs mobile phone floor panel structure.
The pattern distribution of one piece of 120*60mm rectangular metal copper-clad plate 1a) is determined by the feature theory of modules, and extracts metal
The feature modular curve of copper-clad plate, as shown in Fig. 2 five curves represent five patterns of metal copper-clad plate, i.e. single order respectively in Fig. 2
Mould, second order mode, three order modes, four order modes and five order modes, figure it is seen that only First-Order Mode generate in working frequency range it is humorous
Shake, i.e., existing characteristics value is 0 point, therefore is called mode of resonance, and other patterns are difficult for showing antenna radiation characteristics
's.
The feature theory of modules refers to Ha Lindeng in 1971 in document ' Theory of Characteristic Modes
Introduce in for Conducting Bodies '；
The shape and size of rectangular metal copper-clad plate are changed 1b), to guarantee there are in required working band two features
It is worth the mode of resonance for 0, and two modes of resonance will meets designed band requirement, that is, obtain the shape and chi of desirably plate
It is very little, as shown in Figure 3.Floor shown in Fig. 3 includes rectangular metal copper-clad plate 2 and two inductive loads 3,4, the two inductive loads
It is connected with two long sides of rectangular metal copper-clad plate respectively, wherein：
First inductive load 3 includes the first thin short metal band wire 31, the first long and thin metal band wire 32 and the first sheet metal 33,
First thin short metal band wire 31 is located at the middle part on 2 long side of rectangular metal copper-clad plate；First long and thin metal band wire 32 is parallel to metal
The long side of copper-clad plate 2, and a long side of the first long and thin metal band wire 32 is connected with the first thin short metal band wire 31；First gold medal
Category piece 33 is perpendicular to the long side of rectangular metal copper-clad plate 2, and first sheet metal 33 is another with the first long and thin metal band wire 32
The long side of bar is connected.
Second inductive load 4 includes the second thin short metal band wire 41, the second long and thin metal band wire 42 and the second sheet metal 43,
Second thin short metal band wire 41 deviates 5.25mm in the middle part of 2 long side of rectangular metal copper-clad plate；Second long and thin metal band wire 42 parallel to
The long side of metal copper-clad plate 2, and a long side of the second long and thin metal band wire 42 is connected with the second thin short metal band wire 41；The
Two sheet metals 43 are perpendicular to the long side of rectangular metal copper-clad plate 2, and second sheet metal 43 and the second long and thin metal band wire 42
Another long side is connected.
The concrete size of the first thin short metal band wire 31 and the second thin short metal band wire 41 is 4.5*0.5mm, and first is thin
The length and its position relative to 2 long side of rectangular metal copper-clad plate of short metal band wire 31 and the second thin short metal band wire 41
Adjust；The concrete size of the first long and thin metal band wire 32 and the second long and thin metal band wire 42 is 120*1.5mm, and the first long and thin metal
The width of band wire 32 and the second long and thin metal band wire 42 is adjustable；The height of the first sheet metal 33 and the second sheet metal 43 is
5mm, length are respectively 120mm and 99mm.
The feature modular curve on floor designed by extracting, as shown in figure 4, three curves are respectively floor product of the present invention in Fig. 4
Three raw modes of resonance, i.e. the first mode of resonance, the second mode of resonance and the 3rd mode of resonance, it can be seen that the 3rd resonant mode
Formula narrower bandwidth, is not required for us, and bandwidth of operation needed for the first mode of resonance and the second mode of resonance meet will
Ask, Antenna Design, and the wherein resonance point of the first mode of resonance are can be applicable in the humorous of the second modes of resonance of 850MHz or so
Shake a little in 1GHz or so.
Step 2, designs feed placement.
The feature electric field of above-mentioned two mode of resonance 2a) is extracted, and generates distribution map of the electric field, by electric field magnitude scattergram
The position of respective distributing point is set at point of maximum electric field；The distribution map of the electric field generated by two modes of resonance is as shown in figure 5, wherein
5 (a) is distribution map of the electric field of first mode of resonance in its resonance point, and 5 (b) is electricity of second mode of resonance in its resonance point
Field pattern, using point of maximum electric field in two distribution map of the electric field as respective feed position.
Step 3, designs single antenna.
3a) feed position in any one mode of resonance is fed to produce driving voltage, when single antenna can be
Resonance is produced in required working frequency range, that is, completes the optimization design of feed structure：
First, the feed position in the first mode of resonance carries out voltage drive to which by any feed structure, you can
Produce a single antenna；
Then, the shape and size for designing this feed structure are continued to optimize, when the input impedance of produced single antenna is in institute
Need frequency range produce resonance, that is, obtain required feed structure.The first feed structure designed by this example is as shown in fig. 6, first
Feed structure 5 is a rectangular metal sheet, and which is located at the mid portion on 1 long side of floor；The first feed structure one end and the first feedback
Electric port 10 is connected, and the other end is connected with inductive load 3；And first feed structure 5 is adjustable with 10 position of the first feed port.
The input impedance of the single antenna motivated by above-mentioned feed structure 5 is as shown in fig. 7, from figure 7 it can be seen that single antenna
There is resonance point near 850MHz, i.e., the first mode of resonance has effectively been encouraged out by this feed structure；Fig. 8 is single antenna
Return loss plot, from figure 8, it is seen that due to the disappearance of port match structure, antenna operating band only covers 780～
810MHz；
Port Impedance matching is carried out to above-mentioned single antenna 3b), the bandwidth of operation needed for antenna meets completes matching knot
The optimization design of structure.
First, port Impedance matching is carried out to above-mentioned single antenna low frequency, from figure 7 it can be seen that above-mentioned single antenna is in low frequency
There is no resonance point, in order to realize impedance matching, a resonance circuit is introduced in low frequency, optimize and design this resonance circuit, when which
Resonance point is generated in low frequency, that is, completes the design of low frequency mating structure；
Then, port Impedance matching is carried out to above-mentioned single antenna high frequency, from figure 7 it can be seen that above-mentioned single antenna is in high frequency
Perception is relatively strong, in order to realize impedance matching, introduces capacitive structures in high frequency, the positions and dimensions of optimization design this capacitive structures,
When the frequency band in single antenna return loss plot meets demand, that is, complete the design of high frequency mating structure.
Port match structure designed by this example as shown in fig. 9, it includes 0.5mm wide gap 7 and resonance circuit 8, its
The wide gap of middle 0.5mm is located on the second inductive load 4, for realizing that high frequency is matched, distance of the gap 7 away from the second sheet metal 43
For 1mm；And resonance circuit 8 is located on the first feed structure 5, for realizing that low frequency is matched, and the resonance circuit 8 includes one
The lumped inductance 82,83 of the lumped capacity 81 and two 6.8nH of 13pF, three are placed using parallel way, wherein lumped capacity
81 are located between the first lumped inductance 82 and the second lumped inductance 83.
After introducing above-mentioned port match structure, the input impedance of designed single antenna is as shown in Figure 10, by Figure 10 and Fig. 7 pair
Than, it can be seen that the introducing of mating structure causes single antenna also to obtain in the matching that low frequency generates new resonance and high frequency
Improve.
After introducing above-mentioned port match structure, the return loss of designed single antenna is as shown in figure 11, it can be seen that now
Single antenna frequency band covers 750～960MHz, meets design requirement.
Step 4, designs 2MIMO antenna systems.
On the basis of above-mentioned single antenna, the feed position of another mode of resonance is fed to produce excitation electricity
Into second single antenna, needed for two antennas meet simultaneously during bandwidth of operation, that is, the optimization for completing 2MIMO antenna systems sets swaging
Meter.
First, on the basis of above-mentioned single antenna, pass through any feed structure pair in the feed position of the second mode of resonance
Which carries out voltage drive, you can motivate another single antenna, now generates 2MIMO antenna systems；
Then, simulation calculation is carried out to the S parameter of 2MIMO antenna systems, continues to optimize the shape for designing this feed structure
And size, when the bandwidth of two antennas in the S parameter figure of 2MIMO antennas is satisfied by design requirement, that is, complete this feed knot
The optimization design of structure.
As shown in figure 12, the second feed structure 6 is a monopole to second feed structure designed by this example, and its one end is edge
9 upper surface of medium bending metal band wire 61, its width be 0.5mm, the other end along 9 edge of medium be folded upward at and and monopole
The narrow metallic tapes 62 of overhanging portion connect, and second feed structure 6 is extending downwardly at bending metal band wire 61, with the
Two feed ports 11 are connected, and so far, two modes of resonance on floor are obtained for effectively excitation, realize 2MIMO antenna for mobile phone
System.
Overall structure figure using the 2MIMO antenna for mobile phone designed by above-mentioned method for designing is as shown in figure 13.
With reference to Figure 13, the antenna of present invention design includes floor 1, the first feed structure 5, the second feed structure 6, medium base
Plate 9, the first feed port 10 and the second feed port 11, floor is printed on medium substrate upper surface；Wherein floor 1 is used as antenna
Radiating element, it includes rectangular metal copper-clad plate 2 and two inductive loads, i.e. the first inductive load 3 and the second inductive load
4, the two inductive loads are connected with 2 two long sides of rectangular metal copper-clad plate respectively, wherein：
First inductive load 3, including the first thin short metal band wire 31, the first long and thin metal band wire 32 and the first metal
Piece 33；The first thin short metal band wire 31 is located at the middle part on 2 long side of rectangular metal copper-clad plate, and the first long and thin metal band wire 32 is parallel
In the long side of metal copper-clad plate 2, and a long side of the first long and thin metal band wire 32 is connected with the first thin short metal band wire 31；
First sheet metal 33 is perpendicular to the long side of rectangular metal copper-clad plate 2, and first sheet metal 33 and the first long and thin metal band wire 32
Another long side be connected.
Second inductive load 4, including the second thin short metal band wire 41, the second long and thin metal band wire 42 and the second metal
Piece 43；Wherein second thin short metal band wire 41 deviates 5.25mm in the middle part of 2 long side of rectangular metal copper-clad plate, the second long and thin metal band wire
42 parallel to metal copper-clad plate 2 long side, the second sheet metal 43 is perpendicular to the long side of rectangular metal copper-clad plate 2；This is second elongated
One long side of metal band wire 42 is connected with the second thin short metal band wire 41, and another long side is connected with the second sheet metal 43；
Second long and thin metal band wire 42 is provided with the wide gaps 7 of 0.5mm, and distance of the gap 7 away from the second sheet metal 43 is 1mm, with reality
Existing high frequency matching；
The size of the above-mentioned first thin short metal band wire 31 and the second thin short metal band wire 41 is 4.5*0.5mm；First is elongated
The size of metal band wire 32 and the second long and thin metal band wire 42 is 120*1.5mm；First sheet metal 33 and the second sheet metal 43
5mm is highly, length is respectively 120mm and 99mm.
First feed structure 5 is a rectangular metal sheet, and positioned at the mid portion on 1 long side of floor, and which is with first
Feed port 10 is connected；First feed structure 5 is provided with resonance circuit 8, and for realizing that low frequency is matched, the resonance circuit includes one
Individual 13pF lumped capacities 81 and two 6.8nH lumped inductances, i.e. the first lumped inductance 82 and the second lumped inductance 83, three are adopted
Parallel way is placed, and lumped capacity 81 is located between the first lumped inductance 82 and the second lumped inductance 83；
Second feed structure 6 is a monopole, and its one end is the metal band wire 61 along the bending of 9 upper surface of medium, its
The width of middle bending metal band wire 61 is 0.5mm, and total length is 66mm；The bending metal band wire 61 extends to 9 other end of medium
60mm, and be folded upward at 4mm at the edge of the medium other end and be connected with the narrow metallic tapes 62 of monopole overhanging portion, wherein metal
The width of arrowband 62 is 1mm, and length is 30mm；And bending metal band wire 61 extends downwardly 1.5mm, with 11 phase of the second feed port
Even.
The 2MIMO antenna for mobile phone effect of the present invention can be further illustrated by following emulation：
Emulation 1, carries out simulation calculation to the S parameter of 2MIMO antenna for mobile phone of the present invention using business simulation software HFSS, ties
Fruit is as shown in figure 14.
It is seen from figure 14 that two antennas in 2MIMO antenna for mobile phone of the present invention can cover 750-960MHz simultaneously
Frequency range, isolation between antennas is below -8dB, wherein degree of being preferably insulated is up to -18dB, with good isolation effect.
Emulation 2, carries out simulation calculation to the directional diagram of 2MIMO antenna for mobile phone of the present invention using business simulation software HFSS,
As a result as shown in figure 15, wherein 15 (a) is first single antenna in direction corresponding to 750MHz, 850MHz and 950MHz frequency
Figure；Figure 15 (b) is second single antenna in directional diagram corresponding to 750MHz, 850MHz and 950MHz frequency.
It can be seen from fig. 15 that two antennas in 2MIMO antenna for mobile phone of the present invention are basic in the directional diagram of different frequent points
Orthogonality is kept, meets the orthogonal relation of different mode in the feature theory of modules.
Emulation 3, is carried out to the envelope correlation coefficient ECC of 2MIMO antenna for mobile phone of the present invention using business simulation software HFSS
Simulation calculation, as a result as shown in figure 16.
As can be seen from Figure 16, ECC is respectively less than 0.13 in the whole working frequency range, further illustrates the antenna system and has
Good isolation effect.
Above description is only a concrete example of the present invention, does not constitute any limitation of the invention, it is clear that to ability
For the professional in domain, after present invention and principle has been understood, all may be in the feelings without departing substantially from the principle of the invention, structure
Under condition, various amendments and the change in form and details is carried out, but these amendments and change based on inventive concept still exist
Within the claims of the present invention.
Claims (9)
1. a kind of method for designing of the 2MIMO antenna for mobile phone of the feature based theory of modules, comprises the following steps：
(1) design of mobile phone floor panel structure；
(1a) impedance matrix of one piece of rectangular metal copper-clad plate is calculated, the character modules of metal copper-clad plate is extracted by the feature theory of modules
Curve；
(1b) shape and size of rectangular metal copper-clad plate are changed, to guarantee in required working band with two eigenvalues to be
0 mode of resonance, and two modes of resonance will meet designed band requirement, that is, the shape and chi on the floor needed for obtaining
It is very little；
(2) optimization design of feed placement；
(2a) the feature electric field of above-mentioned two mode of resonance is extracted, and generates distribution map of the electric field, by electricity in electric field magnitude scattergram
The position of respective distributing point is set at the maximum point of field；
(3) optimization design of single antenna；
(3a) feed position in any one mode of resonance is fed to produce driving voltage, when single antenna can be required
Resonance is produced in working frequency range, that is, completes the optimization design of feed structure；
(3b) port Impedance matching is carried out to above-mentioned single antenna, the bandwidth of operation needed for antenna meets completes mating structure
Optimization design；
(4) optimization design of 2MIMO antenna systems；
On the basis of above-mentioned single antenna, the feed position of another mode of resonance is fed to produce driving voltage shape
Into second single antenna, needed for two antennas meet simultaneously during bandwidth of operation, that is, the optimization for completing 2MIMO antenna systems sets
Meter.
2. a kind of 2MIMO antenna for mobile phone of the feature based theory of modules, including floor (1), the first feed structure (5), the second feed
Structure (6), medium substrate (9), the first feed port (10) and the second feed port (11), floor is printed on medium substrate upper table
Face, it is characterised in that：
The floor (1), as the radiating element of antenna, it include rectangular metal copper-clad plate (2) and two inductive loads (3,
4), the two inductive loads are connected with (2) two long sides of rectangular metal copper-clad plate respectively, and are set on the second inductive load (4)
The gap (7) for having 0.5mm wide, to realize that high frequency is matched；
First feed structure (5) is connected with the first feed port (10), and is located at the mid portion on floor (1) long side, should
First feed structure (5) is provided with resonance circuit (8), to realize that low frequency is matched；
Second feed structure (6) is connected with the second feed port (11), and is located at the edge portions of floor (1) minor face.
3. antenna according to claim 2, it is characterised in that the first inductive load (3) includes the first thin short metal band wire
(31), the first long and thin metal band wire (32) and the first sheet metal (33), first long and thin metal band wire (32) are covered parallel to metal
The long side of copper coin (2), and a long side of first long and thin metal band wire (32) is connected with the first thin short metal band wire (31)；The
One sheet metal (33) is perpendicular to the long side of rectangular metal copper-clad plate (2), and first sheet metal (33) and the first elongate metallic strap
Another long side of line (32) is connected.
4. antenna according to claim 2, it is characterised in that the second inductive load (4) includes the second thin short metal band wire
(41), the second long and thin metal band wire (42) and the second sheet metal (43), second long and thin metal band wire (42) are covered parallel to metal
The long side of copper coin (2), and a long side of second long and thin metal band wire (42) is connected with the second thin short metal band wire (41)；The
Two sheet metals (43) are perpendicular to the long side of rectangular metal copper-clad plate (2), and second sheet metal (43) and the second elongate metallic strap
Another long side of line (42) is connected.
5. antenna according to claim 2, it is characterised in that the first feed structure (5) is a rectangular metal sheet, and its with
First feed port (10) position is adjustable.
6. antenna according to claim 2, it is characterised in that the second feed structure (6) is a monopole, and its one end is edge
Medium (9) upper surface bending metal band wire (61), the other end be folded upward at along medium (9) edge and with monopole overhanging portion
Narrow metallic tapes (62) connection.
7. antenna according to claim 2, it is characterised in that resonance circuit (8), including a lumped capacity (81) and two
(82,83), three is placed using parallel way, and lumped capacity (81) is positioned at the first lumped inductance (82) and for individual lumped inductance
Between two lumped inductances (83).
8. antenna according to claim 2, it is characterised in that the first thin short metal band wire (31) and the second thin short metal tape
The length of line (41) and its adjustable relative to the position on the long side of rectangular metal copper-clad plate (2).
9. antenna according to claim 2, it is characterised in that the first long and thin metal band wire (32) and the second elongate metallic strap
Line (42) length and rectangular metal copper-clad plate (2) equal length, width is adjustable.
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| CN201611099501.5A CN106602243B (en) | 2016-12-02 | 2016-12-02 | 2MIMO antenna for mobile phone and its design method based on the feature theory of modules |
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| CN201611099501.5A CN106602243B (en) | 2016-12-02 | 2016-12-02 | 2MIMO antenna for mobile phone and its design method based on the feature theory of modules |
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| CN106602243B CN106602243B (en) | 2019-10-25 |
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| CN108172999A (en) * | 2017-12-27 | 2018-06-15 | 西安电子科技大学 | The design method of the 2 port mimo antenna of directional diagram reconstructable of the feature based theory of modules |
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