CN101976759B

CN101976759B - Equivalent LHM (Left Handed Material) patch antenna of split ring resonators

Info

Publication number: CN101976759B
Application number: CN 201010275462
Authority: CN
Inventors: 宋雪桦; 陈丽莲; 陈景柱; 夏鹏; 吴问云
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2010-09-07
Filing date: 2010-09-07
Publication date: 2013-04-17
Anticipated expiration: 2030-09-07
Also published as: CN101976759A

Abstract

The invention relates to an equivalent LHM (Left Handed Material) patch antenna of split ring resonators. The patch antenna comprises two dielectric substrates, a metal grounding plate, two square metal radiation sheets and a metal feeder, wherein the metal grounding plate is fixed on the back of the second dielectric substrate, the square metal radiation sheets are fixed on the front of the first dielectric substrate, the metal feeder is connected with the metal grounding plate and the metal radiation sheets, a four-layered split ring resonator is carved in the square metal radiation sheet on the front of the first dielectric substrate, and another four-layered split ring resonator is carved in the square metal radiation sheet on the front of the second dielectric substrate. In the invention, an LHM combination is added to the patch dielectric substrates to form a patch antenna, thus the localization degree of electromagnetic energy is remarkably improved so as to have higher gain, present lower echo loss, favorably improve the antenna performance to ensure that the patch antenna can be better applied to a plurality of fields, such as mobile communication, satellite communication, aerospace, and the like.

Description

A kind of split ring resonator equivalence left hand medium paster antenna

Technical field

The invention belongs to communication technical field, be specifically related to left hand medium paster antenna.

Background technology

Left hand medium (Left Handed Material, LHM) is that a kind of dielectric constant and magnetic permeability are negative artificial electromagnetic medium simultaneously, is subject in recent years domestic and international research worker's extensive concern.Because when electromagnetic wave was propagated in this kind medium, electric field, magnetic field and wave vector consisted of left hand helix law, so gain the name " left hand medium ".The left hand medium has the unusual characteristic that differs from common nature material is much arranged, and such as negative refractive index, reversed Doppler effect, perfect rib border etc., utilizes these characteristics, can make the high performance antenna based on the left hand medium.It is as a kind of novel artificial electromagnetic material, caused that in recent years people study interest greatly, as far back as nineteen sixty-eight, V.G.Veselageo has just studied the unusual electromagnet phenomenon among the LHM theoretically, 2000, the people such as smith have produced the Medium with Negative-refractive Index LHM of microwave section first in the laboratory unusual electromagnetic property represented it in light and electromagnetic wave field potential significant application value.

By to after the new resonance loop left-handed medium system of being combined to form of common paster antenna, be not difficult to find, its characteristic shows as lower return loss and larger antenna gain, also be easily to be interpreted as from its reason of angle analysis of theory: after the hosqt media of paster antenna has added Left-Handed Material Structures, will form electromagnetism (photon) forbidden band, electromagnetic wave in the frequency range of forbidden band will be subject to constraint and can not propagate to any direction, utilize the forbidden band effect of photonic crystal, can suppress along the surface wave of substrate floor media propagation, thus, to reduce antenna substrate to electromagnetic absorption, increase electromagnetic wave to the reflected energy of free space, thereby reduced the return loss of antenna, increased gain.

Summary of the invention

The present invention mainly provides the equivalent left hand medium microstrip antenna of a kind of split ring resonator (SRR) type, and significantly the energy in the reflecting medium substrate can be realized less return loss and higher gain characteristic effectively.

Technical scheme of the present invention is: the equivalent left hand medium microstrip antenna of a kind of split ring resonator (SRR) type comprises two medium substrates, two radiation sheet metals, a metallic plate ground plate and two square ring radiation sheet metals.Front that is fixed on the first medium substrate of two square ring radiation sheet metals, another one is printed on the face side of second medium substrate, the metallic plate ground plate is printed on the reverse side of second medium substrate, size is the same with medium substrate large, one strip metal feeder line, connection metal radiation fin and metal ground plate, feed-in interface as the antenna electric wave signal, one group of left-handed materials unit, four layers of split ring resonator, be etched in the middle of the radiation fin of first medium substrate side annular, in the middle of the radiation fin of second medium substrate front side side annular, also be carved with four layers of split ring resonator.

By changing length and the width of resonant ring, the wave band of left-handed materials characteristic area is regulated, make its working frequency range that can cover microstrip antenna (5.8GHZ-9.8GHZ).Under the excitation of electromagnetic wave of aerial radiation or reception, amplify the evanescent wave composition in the antenna receiving signal, reduce the return loss of antenna, improve the gain of antenna, improve the directivity of antenna, improve antenna to reception and the emissivities of signal.Simultaneously, the left-handed material microstrip antenna among the present invention is through the realization of circuit board lithographic technique, and manufacture craft is simple, and material price is cheap, is easy to large-scale industrial production.

The present invention compared with prior art, have following advantage: the present invention has added the left hand medium at the medium substrate of paster and has been combined to form paster antenna, the left hand medium has the unusual characteristic that differs from common nature material is much arranged, such as negative refractive index, reversed Doppler effect, perfect rib border etc.The electromagnetic wave resonances of utilizing these characteristics to produce at 7.79644GHz frequency place, the real part that dielectric constant and magnetic permeability occur is negative value simultaneously, its refractive index also is that-1 effect has been strengthened the electromagnetic wave strength of resonance greatly, it so that so structure the localization degree of electromagnetic energy is significantly improved, cause it to have higher gain, and show as lower return loss, this paster antenna improved preferably the performance of antenna, so that can be applied better in various fields such as mobile communication, satellite communication and Aero-Space.

Description of drawings

Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.

Fig. 1 is left hand medium paster antenna Facad structure schematic diagram of the present invention; 11,12-medium substrate, 2-metal ground plate, 31,32-side's ring radiation sheet metal, 4-metal feeder, 51,52-split ring resonator;

Fig. 2 is that the present invention is left hand medium paster side view;

Fig. 3 is left hand medium of the present invention paster antenna side's endless metal radiation fin and four layers of split ring resonator front elevation;

Fig. 4 is that the present invention is the schematic diagram that the return loss in the example distributes with frequency change;

Fig. 5 is that gain in the example of the present invention is with the schematic diagram of angle change profile;

Fig. 6 is the schematic diagram that the standing-wave ratio in the example of the present invention distributes with frequency change.

Embodiment:

Adopt the circuit board lithographic technique, in the microstrip antenna structure as shown in Figure 1, on medium substrate 11, etch respectively radiation sheet metal 31 and metal feeder 4, etch radiation sheet metal 32 and metal ground plate 2 at medium substrate 12.Metal feeder 4 is as the electric wave signal feed-in source of antenna, and connection metal ground plate 2 and radiation sheet metal 31 on medium substrate 11, on the substrate in the middle of the metal radiation sheet 31, etch four layers of split ring resonator.

Fig. 2 is left hand medium paster side view of the present invention, and can find out has two

layer medium substrate

11,12, on medium substrate 12, the centre of metal radiation sheet 32, etch one with medium substrate 11 on four layers of the same split ring resonator.

Microstrip antenna of the present invention can work in microwave frequency band (5.8GHZ-9.8GHZ).The thickness of medium substrate 11 can be adjusted into 1.5mm-2.5mm accordingly, the thickness of medium substrate 12 can be adjusted into 2.5mm-3.5mm accordingly, the thickness of metal ground plate 2 can be adjusted 0.05mm-0.07mm accordingly, the thickness of

metal radiation sheet

31,32 also can be adjusted 0.05mm-0.07mm accordingly.The size of side's endless

metal radiation fin

31,32 and four layers of

split ring resonator

51,52 also can be adjusted (Fig. 3) accordingly.Length L 1=58mm-62mm, L2=48mm-52mm, L3=38mm-42mm, L4=28mm-32mm, L5=18mm-22mm, width D 1=5.5mm-6.5mm, D2=D3=D4=D5=2.5mm-3.5mm.

Realize control to the left-handed materials characteristic area by the dimensional parameters of adjusting split ring resonator, can be so that left hand characteristic zone wave band coats the working frequency range of antenna.By adjusting size, amplify the evanescent wave composition in the antenna receiving signal, reduce the return loss of antenna, improve the gain of antenna, improve the directivity of antenna, improve antenna to reception and the emissivities of signal.

Above-mentioned micro-strip paster antenna is done test with the XFDTD simulation software, and XFDTD is a all-wave 3 D electromagnetic simulation software based on electromagnetism numerical computation method FDTD (Finite-Difference Time-Domain Method) by the exploitation of U.S. REMCOM company.

The main feature of XFDTD:

1) set up the tab that model and input FDTD calculating parameter eject by drop-down menu, system generates Geometry file and Project file automatically.

2) result of output can be by the interface display of XFDTD.It can draw all kinds of parameter curves, and can show that the electromagnetic field of serial time step changes by the snapshot mode.The main observed echo loss of this patent figure, voltage standing wave ratio figure also have gain diagram.

3) setting of driving source is divided near field sources and two kinds of excitations of plane wave source among the XFDTD.Often use the near field sources excitation in most of antennas and microwave loop problem, it comprises Gaussian excitation, the various driving sources such as sinusoidal excitation and User Defined.This patent adopts Gaussian excitation to try to achieve return loss and voltage standing wave ratio, tries to achieve gain with sinusoidal excitation.

4) BORDER PROCESSING can be selected PEC, and PMC and absorbing boundary condition, absorbing boundary condition comprise the LIAOShi boundary condition and mate the PML border fully.This patent adopts and mates the PML border fully to reach best effect.

Obtain as shown in Figure 4 through emulation, obtain return loss s11 characteristic, s11 is-23.0855dB in the minimum echo loss of frequency 7.79644GHz place, has illustrated that the resonance loop left-handed medium structure can further reduce return loss;

As shown in Figure 5, the gain characteristic that obtains gaining, maximum gain is 8.67182dB at frequency 7.79644GHz place, and the gain that the resonance loop left-handed medium structure can larger raising paster antenna is described;

As shown in Figure 6, obtain voltage standing wave ratio VSWR characteristic, the minimum voltage standing-wave ratio is 1.15077 at frequency 7.79644GHz place.

The present invention adopts the circuit board lithographic technique to make antenna, and the centre frequency of antenna is 7.79644GHz.Etch and be of a size of long 60mm, the square endless metal radiation fin 31 of wide 6mm being of a size of the porous SILK substrate 11 of 80mm * 80mm * 2mm (dielectric constant is 2.2).Being of a size of on the TaconicCER-10 substrate 12 of 80mm * 80mm * 3mm (dielectric constant is 10), etch long 60mm, the square endless metal radiation fin 32 of wide 6mm and the metal ground plate 2 that is of a size of 80mm * 80mm.On the porous SiLK substrate 11 in the middle of the metal radiation sheet 31, carve four layers of split ring resonator 51.On Taconic CER-10 substrate 12, also carve four layers of split ring resonator 52 in the middle of the metal radiation sheet 32.Side endless metal radiation fin L1=60mm, wide D1=6mm, four layers of split ring resonator length are followed successively by L2=50mm, L3=40mm, L4=30mm, the wide D2=D3=D4=D5=3mm of L5=20mm.Following at radiation sheet metal, carve long 7mm, the metal wire of wide 2mm is given radiation sheet metal 31 feeds as feeder line 4, finishes the making of antenna.

Claims

1. split ring resonator equivalence left hand medium paster antenna, comprise first medium substrate (11), second medium substrate (12), metal ground plate (2), first party endless metal radiation fin (31), second party endless metal radiation fin (32) and metal feeder (4), metal ground plate (2) is fixed on the reverse side of second medium substrate (12), first party endless metal radiation fin (31) is fixed on the front of first medium substrate (11), metal feeder (4) connection metal ground plate (2) and first party endless metal radiation fin (31), it is characterized in that, in first medium substrate (11) front, four layers of split ring resonator (51) are carved with in first party endless metal radiation fin (31) inside, in second medium substrate (12) front, four layers of split ring resonator (52) also are carved with in second party endless metal radiation fin (32) inside.

2. split ring resonator according to claim 1 equivalence left hand medium paster antenna, it is characterized in that, on the first medium substrate, the inside of first party endless metal radiation fin is provided with four layers of split ring resonator, and on the second medium substrate, the inside of second party endless metal radiation fin also is provided with four layers of split ring resonator.