CN105006653B - Three-frequency antenna based on CSRR and LHTL - Google Patents
Three-frequency antenna based on CSRR and LHTL Download PDFInfo
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- CN105006653B CN105006653B CN201510465245.6A CN201510465245A CN105006653B CN 105006653 B CN105006653 B CN 105006653B CN 201510465245 A CN201510465245 A CN 201510465245A CN 105006653 B CN105006653 B CN 105006653B
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- 230000000295 complement effect Effects 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 100
- 229910052751 metal Inorganic materials 0.000 claims description 100
- 238000004891 communication Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 14
- 230000000875 corresponding effect Effects 0.000 description 5
- 230000005404 monopole Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000002596 correlated effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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Abstract
Based on CSRR and LHTL three-frequency antenna, belong to the multifrequency antenna technical field based on metamaterial structure.In order to solve the problem of existing multifrequency antenna impedance bandwidth is universal narrower.The antenna is the axially symmetric structure using dielectric-slab center line as axle；Complementary split-rings resonator CSRR, left hand transmission line LHTL, co-planar waveguide CPW, two triangle impedance matching units and two equal coating in virtual floor are in dielectric-slab upper surface；Complementary split-rings resonator CSRR structures realize the first two working band of antenna, and Antenna Operation is in element antenna pattern, and left hand transmission line LHTL realizes the 3rd extra work frequency band；Co-planar waveguide CPW is connected with complementary split-rings resonator CSRR, inserts a triangle impedance matching unit respectively between the co-planar waveguide CPW left and right sides, with complementary split-rings resonator CSRR.Applied in indoor communications.
Description
Technical field
The present invention relates to a kind of three frequency multimode antennas based on CSRR and LHTL, belong to the multifrequency based on metamaterial structure
Antenna technical field.
Background technology
Modern wireless indoor communication technology is developed rapidly, and corresponding antenna system is also arisen at the historic moment.Traditional single-band antenna
Can not meet present communicating requirement, thus one it is critically important the problem of be how to receive and send out using an antenna
Multiple signals of the different frequency sent.Multifrequency antenna arises at the historic moment, of increased attention in scientific circles.Multiband day
Line is easy to carry due to flexible, occupying little space, and low cost and wide-band etc. a little, are widely used in indoor communications
In.
2012, S.X.Ta et al. realized dual-band antenna using the asymmetric vibrator of intersection；, K.Saurav etc. in 2014
People realizes a kind of three frequencies linear polarization paster antenna and a double frequency dual-polarized paster by using improved element cell
Antenna.Although these antenna realizes the function of multifrequency, the impedance bandwidth relative narrower of these multifrequency antennas does not surpass typically
Cross 6%.
The content of the invention
The invention aims to solve the problem of existing multifrequency antenna impedance bandwidth is universal narrower, the present invention provides one
Plant the three-frequency antenna based on CSRR and LHTL.
The three-frequency antenna based on CSRR and LHTL of the present invention, the antenna includes complementary split-rings resonator CSRR, a left side
Hand transmission line LHTL, co-planar waveguide CPW, two triangle impedance matching units, two virtual floors and dielectric-slab；
Complementary split-rings resonator CSRR, left hand transmission line LHTL, co-planar waveguide CPW, two triangle impedance matching lists
Member and two equal coating in virtual floor are in dielectric-slab upper surface；The antenna is the axially symmetric structure using dielectric-slab center line as axle；
Complementary split-rings resonator CSRR include outer layer square-shaped metal ring, internal layer square-shaped metal ring, the first metal bar,
First square-shaped metal piece and the second metal bar；
Internal layer square-shaped metal ring is located at center position in outer layer square-shaped metal ring, and the first square-shaped metal piece is located at interior
Center position in layer square-shaped metal ring；
Outer layer square-shaped metal ring connects and composes a SRR, internal layer by the first metal bar and internal layer square-shaped metal ring
Square-shaped metal ring connects and composes another complementary SRR therewith by the second metal bar and the first square-shaped metal piece；
Left hand transmission line LHTL is arranged on the first square-shaped metal piece；
Co-planar waveguide CPW is connected with an outer side edges of outer layer square-shaped metal ring, in co-planar waveguide CPW left and right two
A triangle impedance matching unit is inserted between side, with outer layer square-shaped metal ring respectively.
The left hand transmission line LHTL includes fourchette electric capacity and N number of metallic rod and the second square-shaped metal piece；N is even number；
Second square-shaped metal piece is arranged on dielectric-slab lower surface, and the second square-shaped metal piece is in the position of dielectric-slab
Position with the first square-shaped metal piece is corresponding, and shape size is identical；
N number of metallic rod is divided into two groups, and two groups of N/2 metallic rods equidistantly form a line, and the first square gold is inserted respectively
Belong to the both sides of piece, and through the first square-shaped metal piece, the fourchette electric capacity is arranged on first between two groups of N/2 metallic rods
Square-shaped metal piece upper surface.
The length h=1.4mm at center deviation the first square-shaped metal piece center of fourchette electric capacity.
The length of side a of the outer layer square-shaped metal ring is 11mm, and width is 1mm；
The side length b of the internal layer square-shaped metal ring is 7.6mm, and width is 0.3mm；
The length of side c of the first square-shaped metal piece is 5.6mm.
The finger width p=0.45mm of the fourchette electric capacity, length L5=2.6mm, two neighboring finger slits width q=
0.25mm；
N=14, the cross section of metallic rod is circle, diameter D=0.4mm.
Two virtual floors are distributed in co-planar waveguide CPW both sides.
The cross section of dielectric-slab is square, its length of side L1=20mm, permittivity εr=4.4；
The length of triangle impedance matching unit is L4=1.77mm；
The width L on virtual floor3=5.56mm；
Co-planar waveguide CPW width w=1.48mm,
Clearance distance g=0.2mm between co-planar waveguide CPW and virtual floor 5.
The working frequency of the antenna is 3.95GHz, 5.4GHz or 7.4GHz.
The beneficial effects of the present invention are the present invention proposes a kind of three frequencies, multimode antenna based on metamaterial new construction.
Wherein complementary split-rings resonator CSRR structures realize the first two working band of antenna, and Antenna Operation is in element antenna mould
Formula, and left hand transmission line structure realizes the 3rd extra work frequency band, Antenna Operation in mode of resonance, the invention provides
A kind of multifrequency antenna of broadening impedance bandwidth, by analyzing influence of each structure of antenna to working frequency, so that it is determined that most
Suitable antenna structure.Simulation result shows that the working frequency of antenna is 3.95GHz, 5.4GHz, or 7.4GHz.By preferable
Radiation characteristic and broader impedance bandwidth, it is adaptable to indoor communications.
Brief description of the drawings
Fig. 1 is the principle schematic of the three-frequency antenna based on CSRR and LHTL described in embodiment one.
Fig. 2 is Fig. 1 back side principle schematic.
Fig. 3 is the principle schematic of the three-frequency antenna based on CSRR and LHTL described in embodiment.
Fig. 4 is the principle schematic of the left hand transmission line LHTL described in embodiment.
Fig. 5 is the curve synoptic diagram of influences of the length of side a of outer layer square-shaped metal ring to return loss S11.
Fig. 6 holds the curve of influences of the length h for deviateing the second square-shaped metal piece center to return loss S11 for finger plug-in
Schematic diagram.
Fig. 7 is the curve synoptic diagram of the optimal return loss S11 of three-frequency antenna described in embodiment two.
Fig. 8 is the curve synoptic diagram of the optimal return loss S11 of three-frequency antenna described in embodiment two.
Fig. 9 is the directional diagram in three-frequency antenna xoz directions in working frequency 3.95GHz described in embodiment two.
Figure 10 is the directional diagram in three-frequency antenna yoz directions in working frequency 3.95GHz described in embodiment two.
Figure 11 is the directional diagram in three-frequency antenna xoz directions in working frequency 5.4GHz described in embodiment two.
Figure 12 is the directional diagram in three-frequency antenna yoz directions in working frequency 5.4GHz described in embodiment two.
Figure 13 is the directional diagram in three-frequency antenna xoz directions in working frequency 7.4GHz described in embodiment two.
Figure 14 is the directional diagram in three-frequency antenna yoz directions in working frequency 7.4GHz described in embodiment two.
Embodiment
Embodiment one：Illustrate present embodiment with reference to Fig. 1, described in present embodiment based on CSRR's and LHTL
Three-frequency antenna, the antenna includes complementary split-rings resonator CSRR (Complementary Split Ring
Resonator), left hand transmission line LHTL (Left Handed Transmission Line), co-planar waveguide CPW3, two three
Angular impedance matching unit 4, two virtual floors 5 and dielectric-slab 6；
Complementary split-rings resonator CSRR, left hand transmission line LHTL, co-planar waveguide CPW3, two triangle impedance matching lists
Member 4 and two equal coating in virtual floor 5 are in the upper surface of dielectric-slab 6；The antenna is the axial symmetry knot using the center line of dielectric-slab 6 as axle
Structure；
Complementary split-rings resonator CSRR includes outer layer square-shaped metal ring 1-1, internal layer square-shaped metal ring 1-2, first
Metal bar 1-3, the first square-shaped metal piece 1-4 and the second metal bar 1-5；
Internal layer square-shaped metal ring 1-2 is located at center position, the first square-shaped metal piece in outer layer square-shaped metal ring 1-1
1-4 is located at center position in internal layer square-shaped metal ring 1-2；
Outer layer square-shaped metal ring 1-1 connects and composes one by the first metal bar 1-3 and internal layer square-shaped metal ring 1-2
SRR, internal layer square-shaped metal ring 1-2 connect and compose another by the second metal bar 1-5's and the first square-shaped metal piece 1-4
Complementary SRR therewith；
Left hand transmission line LHTL is arranged on the first square-shaped metal piece 1-4；
Co-planar waveguide CPW3 is connected with an outer layer square-shaped metal ring 1-1 outer side edges, on a co-planar waveguide CPW3 left side
A triangle impedance matching unit 4 is inserted respectively between right both sides, with outer layer square-shaped metal ring 1-1.
Two virtual floors 5 are distributed in co-planar waveguide CPW 3 both sides.
For the impedance bandwidth of monopole antenna of the broadening based on CSRR, in complementary split-rings resonator CSRR and coplanar ripple
The triangle impedance matching unit 4 of insertion two is led between CPW 3, the working characteristics of dual-band antenna is realized.
Left hand transmission line LHTL is arranged on square-shaped metal piece 1-4, on the basis of the CSRR monopole antennas of script
A kind of radiation mode new based on LHTL is just set up, and another work is realized in the case of no increase antenna size
Working frequency.
Embodiment two：Illustrate present embodiment with reference to Fig. 4 to Figure 14, present embodiment is to embodiment
The further restriction of the three-frequency antenna based on CSRR and LHTL described in one, the left hand transmission line LHTL includes fourchette electric capacity 2-
1 and 14 metallic rod 2-2 and the second square-shaped metal piece 2-3；
Second square-shaped metal piece 2-3 is arranged on the lower surface of dielectric-slab 6, and the second square-shaped metal piece 2-3 is in medium
The position of plate 6 is corresponding with the first square-shaped metal piece 1-4 position, and shape size is identical；
14 metallic rods are divided into two groups, and two groups of metallic rods equidistantly form a line, and the first square-shaped metal piece is inserted respectively
1-4 both sides, and through the first square-shaped metal piece 1-4, the fourchette electric capacity 2-1 is arranged between two groups of metallic rod 2-2
First square-shaped metal piece 1-4 upper surfaces.1-4 constructs a fourchette electric capacity 2-1 on the first square-shaped metal piece, so as to realize
Left-handed capacitors.
In order to realize LHTL, c square-shaped metal piece 2-3 is similarly in one length of side of back up of dielectric-slab first
As virtually, as shown in Figure 2.Then with 14 metallic rods, the square-shaped metal piece of levels is electrically connected by diameter D=0.4mm
Pick up and, it is achieved thereby that left hand inductance.
The emulation of present embodiment antenna and analysis result：
In this part, with simulation results show, the several crucial physical dimensions of antenna are to corresponding working frequency
Influence.Then the antenna structure under optimal radiation characteristic and the impedance operator under simulation result can have been drawn.
As shown in figure 5, when outer layer square-shaped metal ring 1-1 length of side a is 9mm, centre frequency is about 4GHz, about
It is the 1/4 of effective wavelength.It is same in fig. 6 it can be seen that when internal layer square-shaped metal ring 1-2 side length b is 6.8mm, in
Frequency of heart is about 5.8GHz, is equally approximately equal to the 1/4 of effective wavelength.Meanwhile, Fig. 5 can be seen that outer layer square-shaped metal ring
Length of side a is to first, that is, minimum working frequency has obvious influence, when a increases, it can be seen that centre frequency subtracts
It is small.Fig. 6 can be seen that internal layer square-shaped metal ring 1-2 side length b has obvious influence to second working frequency, equally and b
Negatively correlated relation.It can be seen that complementary split-rings resonator CSRR has with common quarter-wave monopole antenna
Same work characteristics.The centre frequency of working band and SRR length are closely related.For monopole of the broadening based on CSRR
The bandwidth of antenna, adds two triangle impedance matchings between complementary split-rings resonator CSRR and co-planar waveguide CPW 3
Unit.
Different from complementary split-rings resonator CSRR, increased LHTL arrangement works are in another resonant mode on this basis
In formula.In order to realize LHTL structures, so-called left-handed capacitors and left hand inductance needs rational structure arrangement.Present embodiment is adopted
The left-handed capacitors on sheet metal are realized with plug-in appearance is referred to, the left hand inductance between sheet metal is realized with the metallic rod of ground connection.
By optimizing LHTL structure, a higher working frequency can be obtained at 7.5GHz.Emphasize herein, by adjusting metal
The position of left-handed capacitors on piece, can obtain more preferable impedance matching property.It can be seen from figure 7 that holding 2-1 when referring to plug-in
When deviateing the length h increases at the second square-shaped metal piece 2-3 centers, -10dB impedance bandwidths have obvious improvement.
Finally, the optimal return loss S11 of three-frequency antenna is as shown in Figure 8.It is special that antenna presents good three frequency
Property, first job frequency band is 3.8GHz to 4GHz, and second working band is 4.9GHz to 6.3GHz, the 3rd working band
It is 7.35GHz to 7.5GHz.Higher bandwidth of operation is realized, wherein the relative bandwidth of second working frequency range reaches
12.96%.Emulation the directional diagram such as Fig. 9 and Figure 10 of antenna in 3.95GHz, antenna 5.4GHz emulation directional diagram such as Figure 11 with
Figure 12, emulation the directional diagram such as Figure 13 and Figure 14 of antenna in 7.4GHz, corresponding gain is respectively 2.5dB, 2.3dB and
1.3dB. can be seen that the mode of operation of first job frequency band is identical with quarter-wave monopole.In the 3rd work
In frequency band, due to the skew of LHTL positions, it result in the major lobe of directional diagram and slightly offset by x-axis direction.
Simulation result shows that the working frequency of antenna is 3.95GHz, 5.4GHz, and 7.4GHz.By preferable radiation
Characteristic and broader impedance bandwidth, it is adaptable to indoor communications.
Embodiment three：Illustrate present embodiment with reference to Fig. 3 and Fig. 4, present embodiment is to embodiment
In the further restriction of the three-frequency antenna based on CSRR and LHTL described in two, present embodiment, the outer layer square-shaped metal
Ring 1-1 length of side a is 11mm, and width is 1mm；
The side length b of the internal layer square-shaped metal ring 1-2 is 7.6mm, and width is 0.3mm；
The length of side c of the square-shaped metal piece 1-4 is 5.6mm.
The finger width p=0.45mm of the fourchette electric capacity, length L5=2.6mm, two neighboring finger slits width q=
0.25mm；The diameter D=0.4mm of metallic rod；The cross section of dielectric-slab 6 is square, its length of side L1=20mm, permittivity εr
=4.4；The length of triangle impedance matching unit 4 is L4=1.77mm；The width L on virtual floor 53=5.56mm；Co-planar waveguide
CPW 3 width w=1.48mm,
Clearance distance g=0.2mm between co-planar waveguide CPW 3 and virtual floor 5.
The length h=1.4mm at the center deviation square-shaped metal piece 1-4 centers of fourchette electric capacity.
Claims (8)
1. a kind of three frequency small size antennas based on CSRR and LHTL, it is characterised in that the antenna includes complementary openings ring resonance
Device CSRR, left hand transmission line LHTL, co-planar waveguide CPW (3), two triangle impedance matching units (4), two virtual floors
And dielectric-slab (6) (5)；
Complementary split-rings resonator CSRR, left hand transmission line LHTL, co-planar waveguide CPW (3), two triangle impedance matching units
And two virtual floors (5) coating are in dielectric-slab (6) upper surface (4)；The antenna is the axle using dielectric-slab (6) center line as axle
Symmetrical structure；
Complementary split-rings resonator CSRR includes outer layer square-shaped metal ring (1-1), internal layer square-shaped metal ring (1-2), first
Metal bar (1-3), the first square-shaped metal piece (1-4) and the second metal bar (1-5)；
Internal layer square-shaped metal ring (1-2) is located at outer layer square-shaped metal ring (1-1) interior center position, the first square-shaped metal piece
(1-4) is located at internal layer square-shaped metal ring (1-2) interior center position；
Outer layer square-shaped metal ring (1-1) connects and composes one by the first metal bar (1-3) and internal layer square-shaped metal ring (1-2)
Individual SRR, internal layer square-shaped metal ring (1-2) passes through the second metal bar (1-5) and the connection structure of the first square-shaped metal piece (1-4)
Into another complementary SRR therewith；
Left hand transmission line LHTL is arranged on the first square-shaped metal piece (1-4)；
Co-planar waveguide CPW (3) is connected with an outer side edges of outer layer square-shaped metal ring (1-1), co-planar waveguide CPW's (3)
A triangle impedance matching unit (4) is inserted between the left and right sides, with outer layer square-shaped metal ring (1-1) respectively.
2. the three frequency small size antennas according to claim 1 based on CSRR and LHTL, it is characterised in that
The left hand transmission line LHTL includes fourchette electric capacity (2-1) and N number of metallic rod (2-2) and the second square-shaped metal piece (2-
3)；N is even number；
Second square-shaped metal piece (2-3) is arranged on dielectric-slab (6) lower surface, and the second square-shaped metal piece (2-3) is being situated between
The position of scutum (6) is corresponding with the position of the first square-shaped metal piece (1-4), and shape size is identical；
N number of metallic rod (2-2) is divided into two groups, and every group of N/2 metallic rod (2-2) equidistantly forms a line, and first is being inserted respectively just
The two opposite sides of square metal piece (1-4), and through the first square-shaped metal piece (1-4), the fourchette electric capacity (2-1) is arranged on
First square-shaped metal piece (1-4) upper surface between two groups of N/2 metallic rods.
3. the three frequency small size antennas according to claim 2 based on CSRR and LHTL, it is characterised in that
The length h=1.4mm at center deviation the first square-shaped metal piece (1-4) center of fourchette electric capacity (2-1).
4. the three frequency small size antennas according to claim 3 based on CSRR and LHTL, it is characterised in that
The length of side a of the outer layer square-shaped metal ring (1-1) is 11mm, and width is 1mm；
The side length b of the internal layer square-shaped metal ring (1-2) is 7.6mm, and width is 0.3mm；
The length of side c of the first square-shaped metal piece (1-4) is 5.6mm.
5. the three frequency small size antennas according to claim 4 based on CSRR and LHTL, it is characterised in that
The finger width p=0.45mm, length L of the fourchette electric capacity (2-1)5=2.6mm, two neighboring finger slits width q=
0.25mm；
N=14, the cross section of metallic rod (2-2) is circle, diameter D=0.4mm.
6. the three frequency small size antennas according to claim 5 based on CSRR and LHTL, it is characterised in that
Two virtual floors (5) are distributed in the both sides of co-planar waveguide CPW (3).
7. the three frequency small size antennas according to claim 6 based on CSRR and LHTL, it is characterised in that
The cross section of dielectric-slab (6) is square, its length of side L1=20mm, permittivity εr=4.4；
The length of triangle impedance matching unit (4) is L4=1.77mm；
The width L on virtual floor (5)3=5.56mm；
Co-planar waveguide CPW (3) width w=1.48mm,
Clearance distance g=0.2mm between co-planar waveguide CPW (3) and virtual floor (5).
8. the three frequency small size antennas according to claim 7 based on CSRR and LHTL, it is characterised in that
The working frequency of the antenna is 3.95GHz, 5.4GHz or 7.4GHz.
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| CN106785407B (en) * | 2017-01-23 | 2019-05-28 | 厦门大学 | The three-frequency antenna in the nested double R shape left-handed configuration gaps of load |
| CN107221753B (en) * | 2017-05-22 | 2020-01-31 | 西安电子科技大学 | Multi-band left-handed material structure |
| CN112751185B (en) * | 2020-12-29 | 2022-04-08 | 瑞声新能源发展(常州)有限公司科教城分公司 | Antenna unit, antenna device and electronic terminal |
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| US7911386B1 (en) * | 2006-05-23 | 2011-03-22 | The Regents Of The University Of California | Multi-band radiating elements with composite right/left-handed meta-material transmission line |
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| US7839236B2 (en) * | 2007-12-21 | 2010-11-23 | Rayspan Corporation | Power combiners and dividers based on composite right and left handed metamaterial structures |
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| US7911386B1 (en) * | 2006-05-23 | 2011-03-22 | The Regents Of The University Of California | Multi-band radiating elements with composite right/left-handed meta-material transmission line |
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