CN105305058A - Ultra-wideband multiple-input-multiple-output antenna with triple-band notch characteristics - Google Patents
Ultra-wideband multiple-input-multiple-output antenna with triple-band notch characteristics Download PDFInfo
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- CN105305058A CN105305058A CN201510861118.8A CN201510861118A CN105305058A CN 105305058 A CN105305058 A CN 105305058A CN 201510861118 A CN201510861118 A CN 201510861118A CN 105305058 A CN105305058 A CN 105305058A
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Abstract
The invention discloses an ultra-wideband multiple-input-multiple-output antenna with triple-band notch characteristics. The ultra-wideband multiple-input-multiple-output antenna comprises a dielectric substrate. Two rectangular radiation units are printed on the front surface of the dielectric substrate and are symmetrical to each other about the middle line of the dielectric substrate. A floor is printed on the back surface of the dielectric substrate. Each rectangular radiation unit is provided with an inverted U-shaped groove and two input end feed lines. Each rectangular radiation unit is connected with the input end feed lines. Two sides of each input end feed line are each provided with a parasitic strip, and the parasitic strips are an inner parasitic strip and an outer parasitic strip. The ultra-wideband multiple-input-multiple-output antenna is suitable for various miniature mobile terminals including mobile phones.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of ultra broadband mimo antennas with three frequency range trap characteristics.
Background technology
Along with developing rapidly of Modern wireless communication technology, the requirement of communication system to antenna is more and more higher, designs the focus that the ultra broadband mimo antennas with multiple frequency band trap characteristic is Recent study.Multiple-input, multiple-output Multiple-input-multiple-output (MIMO) technology, because can increase considerably channel capacity, and does not need extra increase spectral range and input power, day by day becomes the important research direction that Antenna Design is new.Ultra broadband ultra-wideband (UWB) is that one has very broadband, is applied to the communication technology in the wireless portable device of Large Copacity, high data rate.In order to increase channel capacity by a larger margin further, in the last few years, MIMO technology was incorporated into the design of ultra-wideband antenna gradually.Consider be operated in different frequency range system between can there is the problem of interference, it is current research tendency that design has the ultra broadband mimo antenna all having a trap characteristic at multiple frequency band.Such as, be operated in ultra wideband frequency 3.1GHz-10.6GHz, simultaneously can the 5.15GHz-5.35GHz of filtering WLAN (wireless local area network) wirelesslocalareanetwork (WLAN), the antenna of the C frequency band 3.7GHz-4.2GHz of 5.725GHz-5.825GHz and satellite communication system.Along with the fast development of high speed integrated circuit, system equipment is to integration, miniaturized, integratedly constantly strides forward, and as the terminal of radio-based electronic devices, modern electronic equipment proposes miniaturization to antenna, is easy to integrated requirement.
Miniaturized many traps ultra broadband mimo antenna be a kind of conventional can the array antenna of the effective multiple interference band of filtering.It is slot as resonator in radiation patch or floor that the implementation method of traditional ultra broadband mimo antenna trap mainly contains three kinds: one, two is extend special construction as resonator in radiation patch or floor, and three is place parasitic special construction as resonator in radiation patch or ground panel area.These resonators can form resonance in specific frequency thus reach the object in feature frequency range outside emittance less.
Traditional ultra broadband mimo antennas with trap characteristic, due to the restriction of size, can only realize one or two notch band.And an outstanding defect is that notch band is wide, thus make useful frequency range by filtering, waste certain usable frequency.
Summary of the invention
In order to overcome the shortcoming of prior art existence with not enough, the invention provides a kind of ultra broadband mimo antennas with three frequency range trap characteristics.
The present invention adopts traditional feed microstrip line method, utilize multiple new resonator and then realize multiple narrower notch band, and extend isolation between feed port that minor matters improve full frequency band by designing the cumulative floor of width, obtain a kind of novel ultra broadband mimo antennas with multiband trap characteristic.Compact dimensions, structure is simple, and processing and manufacturing cost is low, and engineering practicability is high.
The present invention adopts following technical scheme:
A kind of ultra broadband mimo antennas with three frequency range trap characteristics, comprise medium substrate, two rectangular radiation element are printed in the front of described medium substrate, described two rectangular radiation element are symmetrical about medium substrate center line, printing floor, the described medium substrate back side, inverted U-channel is had in each rectangular radiation element, also comprise two input feeder lines, described rectangular radiation element is connected with input feeder line, every bar input feeder line both sides are equipped with parasitic bar, comprise the parasitic bar of the parasitic bar in inner side and outside.
The axis on described floor is provided with the cumulative floor of width and extends minor matters, and the cumulative floor of described width extends minor matters and is connected with floor.
Described inverted U-channel is specifically positioned at the centre of rectangular radiation element, and slots along the edge of rectangular radiation element.
The total length of described inverted U-channel is 25.6mm.
Described input feeder line is the microstrip line of characteristic impedance 50 ohm.
The parasitic bar length in described inner side is 16.0mm, and the parasitic bar length in described outside is 17.4mm.
Described two input feeder lines are symmetrical about medium substrate center line.
The parasitic bar in described medial and lateral is the parasitic bar of C shape.
Beneficial effect of the present invention:
(1) completely covers ultra wideband frequency by the structure of plane, 3.1GHz-10.6GHz, simultaneously can the 5.15GHz-5.35GHz of filtering three interference band: WLAN (wireless local area network) wirelesslocalareanetwork (WLAN) effectively, the C frequency band 3.7GHz-4.2GHz of 5.725GHz-5.825GHz and satellite communication system.The most important thing is, because notch band is extremely narrow, make the usable frequency of 5.35GHz-5.725GHz save out, can be utilized effectively.
(2) planar dimension of whole antenna, comprising floor is 30mm × 26mm, and the size taken is extremely little, and the FR4 sheet material of feasible planes typography and low cost, reduces manufacturing cost.
(3) structure of antenna is simple, and debugging is convenient, and mode of operation is clear, and the pattern in each trap frequency range can independently regulate flexibly, thus for other interfering frequencies of filtering.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation with the ultra broadband mimo antennas of three frequency range trap characteristics of the present invention;
Fig. 2 is the plan structure figure of Fig. 1;
Fig. 3 is the face upwarding assumption diagram of Fig. 1;
Fig. 4 is the side-looking structure chart of Fig. 1;
Fig. 5 is return loss and the frequency relation figure of the invention process emulation.
Fig. 6 is interport isolation and the frequency relation figure of embodiment of the present invention emulation.
Fig. 7 is the gain diagram of the invention process emulation.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
Call inner side near medium substrate center line side in the present embodiment, do not become outside near medium substrate center line side.
As shown in Figure 1, a kind of ultra broadband mimo antennas with three frequency range trap characteristics, comprise medium substrate, two rectangular radiation element 1,2 are printed in described medium substrate front, described two rectangular radiation element are symmetrical about medium substrate axis, printing floor, the described medium substrate back side 9, and in the present embodiment, floor is rectangle, two rectangular radiation element 1,2 are equivalent to two monopole antennas, are used for forming the working band that width covers 3.1-10.6GHz.
Inverted U-channel is had in described each rectangular radiation element, described inverted U-channel is positioned at the centre position of rectangular radiation element, described inverted U-channel is slotted along rectangular element edge, in the present embodiment, the length of inverted U-channel is all 25.6mm, be equivalent to half-wavelength mode resonances near the 4.0GHz of satellite communication system C frequency band, can filtering interfering frequency range effectively: the C frequency band 3.7GHz-4.2GHz of satellite communication system;
The present invention also comprises two input feeder lines 3,4, described two input feeder lines are symmetrical about medium substrate center line, two rectangular radiation element are connected with two input feeder lines respectively, every bar input feeder line both sides are equipped with parasitic bar, the parasitic bar of both sides is symmetrical about input feeder line, the parasitic bar in inner side and outer side is equivalent to half-wavelength mode resonances respectively near WLAN5.2GHz and WLAN5.8GHz, can 5.15GHz-5.35GHz and 5.725-5.825GHz of filtering interfering frequency range WLAN (wireless local area network) wirelesslocalareanetwork (WLAN) effectively.
The parasitic bar in described medial and lateral is C shape parasitic bar, specifically similar square C shape, and filtration result is best.
In the present embodiment, every bar input feeder line all has the parasitic bar of the parasitic bar in inner side and outside, and the parasitic bar in described medial and lateral is symmetrical about input feeder line, and parasitic bar 7,8 length in inner side is 16mm, is equivalent to half-wavelength mode resonances near WLAN5.8GHz; The length of the parasitic bar 5,6 in outside is 17.4mm, is equivalent to half-wavelength mode resonances near WLAN5.2GHz.
The axis on described floor is provided with the cumulative floor of width and extends minor matters 10, and the cumulative floor of described width extends minor matters 10 and is connected with floor 9, and the width of floor extension minor matters increases the isolation regulating whole ultra broadband frequency band gradually.
Described input feeder line 3,4 is the microstrip line of characteristic impedance 50 ohm.
As shown in Figure 2, Figure 3 and Figure 4, the concrete size of the present embodiment is as follows:
The thickness H=0.8 of medium substrate, the transverse width W=30 of medium substrate, the transverse width W of the extension minor matters Part I from bottom to top on floor
g2=3, floor extends the transverse width W of minor matters Part II from bottom to top
g3=4.2, floor extends the transverse width W of minor matters Part III from bottom to top
g4=8.8, the transverse width W of rectangular radiation element
r=9.8, the transverse width W of inverted U-channel in rectangular radiation element
r1=8, the transverse width W of the opening part of inverted U-channel in rectangular radiation element
r2=0.4, the longitudinal length W of the parasitic bar in input feeder line both sides
c1=8, the longitudinal length W of the opening part of parasitic bar outside input feeder line
c2=0.6, the opening part longitudinal length W of the parasitic bar in inner side
c3=2, feeder line inside edge is to the horizontal spacing W of rectangular radiation element inside edge
s1=3.5, feeder line outer ledge is to the horizontal spacing W of rectangular radiation element outer ledge
s2=4.7, the longitudinal length L=26 of medium substrate, the longitudinal length L of floor rectangle part
g1=11.7, floor extends the longitudinal length L of minor matters Part I from bottom to top
g2=6.8, floor extends the longitudinal length L of minor matters Part II from bottom to top
g3=6.5, floor extends the longitudinal length L of minor matters Part III from bottom to top
g4=1, the longitudinal length L of feeder line
f=12.5, the longitudinal length L of rectangular radiation element
r=8, the spacing h of the lower limb of inverted U-channel and the lower limb of rectangular radiation element in rectangular radiation element
r1=1, the longitudinal length h of inverted U-channel in rectangular radiation element
r2=6, the lower limb of the parasitic bar in feeder line both sides is to the distance h of dielectric-slab lower limb
c1=2.5, the transverse width h of the parasitic bar in feeder line both sides
c2=2, the well width g of inverted U-channel in rectangular radiation element
r=0.5, the bar width g of the parasitic bar in feeder line both sides
c1=0.5, the parasitic bar in feeder line both sides is to the horizontal spacing g of feeder line
c2=0.4, the outer ledge of feeder line transverse direction is to the spacing d of dielectric-slab outer ledge
f=4.9.
The present invention realizes the covering of ultra wideband frequency (3.1GHz-10.6GHz).Two rectangular radiation element are equivalent to two monopole antennas, compare the minor matters line that the length that can only produce single resonance frequency is larger, the rectangular radiation element that structure is less can produce multiple mode of resonance in 3.1GHz-10.6GHz frequency range, thus covers the whole working band of 3.1-10.6GHz.And compare the folding needing to do serpentine structure in minor matters line, the requirement on machining accuracy of rectangular radiation element is lower, is easy to manufacture realize.Utilize the length of rectangle and the less parameter of width two simultaneously, the multiple modes of resonance in ultra wideband frequency (3.1GHz-10.6GHz) can be regulated more neatly, thus realize accurately covering completely of frequency.
Next is the notch band realizing three Independent adjustable, thus the 5.15GHz-5.35GHz of filtering three interference band: WLAN (wireless local area network) wirelesslocalareanetwork (WLAN) effectively, the C frequency band 3.7GHz-4.2GHz of 5.725GHz-5.825GHz and satellite communication system.One is, opening total length in the middle of rectangular radiation element is all 25.6mm inverted U-channel, and the length of inverted U-channel is equivalent to half-wavelength mode resonances near the 4.0GHz of satellite communication system C frequency band; Two are, add parasitic bar in the outside of two input feeder lines, and total length is all 17.4mm, and it is equivalent to half-wavelength mode resonances near WLAN5.2GHz; Three are, add parasitic bar in the inner side of two input feeder lines, and total length is all 16.0mm, and it is equivalent to half-wavelength mode resonances near WLAN5.8GHz.The interpolation of these three resonators can effective filtering interfering frequency.
Realize high interport isolation again.Minor matters 10 are extended by extending the cumulative floor of width in the middle, the back side of dielectric-slab, the antenna pattern that a port can be made to produce is reflected, utilize these minor matters 10 to produce new mode of resonance to regulate isolation simultaneously, and then make the isolation between two ports be reduced to below-20dB, effectively achieve the mutual minimum interference between different port.
In order to verify the validity of the present invention program, providing instantiation below and being described.
Fig. 2 to Fig. 4 gives embodiment and overlooks, looks up and the dimensional drawing under the different angles such as side-looking, and in each figure, the unit of all sizes is millimeter (mm).In this embodiment, select the FR4 medium substrate that relative dielectric constant is 4.4, loss angle tangent is 0.02, thickness is 0.8mm, the planar dimension of substrate is 30mm × 26mm.The planar rectangular part on floor is of a size of 30mm × 11.7mm.Rectangular radiation element is positioned at the side of medium substrate, and the planar dimension taken is 8mm × 9.8mm.Signal input part feeder line is the microstrip line of characteristic impedance 50 ohm.In reality is implemented, can radio frequency feed line part in proper extension to circuit, also can perforate on main floor, with the coaxial line direct feed of 50 ohm.The inner wire of coaxial line is connected with exciting unit, and outer conductor is connected with main floor.
The result of the reflection coefficient of the antenna emulation made with above-mentioned Fig. 2, Fig. 3 and Fig. 4 illustrated dimension as shown in Figure 5.As seen from the figure, this planar printed antenna has in 3.1GHz-10.6GHz frequency range at ultra wideband frequency and produces multiple resonance point,-10dB the bandwidth formed is 3GHz-11.2GHz, and completely covers ultra wideband frequency has all available frequency bands in 3.1GHz-10.6GHz frequency range.The simultaneously 5.15GHz-5.35GHz of filtering three interference band: WLAN (wireless local area network) wirelesslocalareanetwork (WLAN) effectively, the C frequency band 3.7GHz-4.2GHz of 5.725GHz-5.825GHz and satellite communication system.
The result of the interport isolation of the antenna emulation made with above-mentioned 3 figure illustrated dimension as shown in Figure 6.In whole ultra wideband frequency 3.1GHz-10.6GHz frequency range, the isolation between port, all lower than-21dB, meets actual needs completely.(in fact only needing the isolation of-15dB can meet the needs of practical application).This middle, the back side having benefited from dielectric-slab is extended the cumulative floor of width and is extended the ELECTROMAGNETIC REFLECTION effect of minor matters 10 generation and the new mode of resonance of minor matters 10 generation.
The gain of the antenna emulation made with above-mentioned 3 figure illustrated dimension as shown in Figure 7.Antenna gain is fluctuating between 2-4dBi, acutely reduces at 3.2/5.5/8GHz tri-notch band.Achieve the target of the interfering frequency between filtering different system.
From technique scheme, antenna of the present invention achieves the covering of ultra wideband frequency (3.1GHz-10.6GHz) and the notch band of three Independent adjustable in the plane space of 30mm × 26mm, and have high-isolation between port, meet mobile communication system to the design requirement for mobile terminal antenna.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (8)
1. one kind has the ultra broadband mimo antennas of three frequency range trap characteristics, it is characterized in that, comprise medium substrate, two rectangular radiation element are printed in the front of described medium substrate, described two rectangular radiation element are symmetrical about medium substrate center line, printing floor, the described medium substrate back side, inverted U-channel is had in each rectangular radiation element, also comprise two input feeder lines, described rectangular radiation element is connected with input feeder line, every bar input feeder line both sides are equipped with parasitic bar, comprise the parasitic bar of the parasitic bar in inner side and outside.
2. ultra broadband mimo antennas according to claim 1, is characterized in that, the axis on described floor is provided with the cumulative floor of width and extends minor matters, and the cumulative floor of described width extends minor matters and is connected with floor.
3. ultra broadband mimo antennas according to claim 1, is characterized in that, described inverted U-channel is specifically positioned at the centre of rectangular radiation element, and slots along the edge of rectangular radiation element.
4. ultra broadband mimo antennas according to claim 3, is characterized in that, the total length of described inverted U-channel is 25.6mm.
5. ultra broadband mimo antennas according to claim 1, is characterized in that, described input feeder line is the microstrip line of characteristic impedance 50 ohm.
6. ultra broadband mimo antennas according to claim 1, is characterized in that, the parasitic bar length in described inner side is 16.0mm, and the parasitic bar length in described outside is 17.4mm.
7. ultra broadband mimo antennas according to claim 1, is characterized in that, described two input feeder lines are symmetrical about medium substrate center line.
8. ultra broadband mimo antennas according to claim 1, is characterized in that, the parasitic bar in described medial and lateral is the parasitic bar of C shape.
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| CN201510861118.8A CN105305058B (en) | 2015-11-30 | 2015-11-30 | A kind of ultra wide band mimo antennas with three frequency range trap characteristics |
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Cited By (6)
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| CN109755729A (en) * | 2018-12-11 | 2019-05-14 | 上海电力学院 | A kind of dual-attenuation ultra wide band mimo antenna flexible |
| CN109755733A (en) * | 2018-12-11 | 2019-05-14 | 上海电力学院 | A kind of double trap UWB antennas based on liquid crystal polymer |
| CN110931971A (en) * | 2019-12-25 | 2020-03-27 | 贵州民族大学 | Low-coupling microstrip feed ultra-wideband trapped wave antenna structure |
| CN112003023A (en) * | 2020-08-26 | 2020-11-27 | 惠州市德亿科技有限公司 | Manufacturing method and structure of extensible broadband MIMO antenna with self-isolation characteristic |
| CN114243278A (en) * | 2021-12-15 | 2022-03-25 | 杭州电子科技大学 | Four-trap high-isolation ultra-wideband MIMO antenna |
| WO2022213995A1 (en) * | 2021-04-09 | 2022-10-13 | 维沃移动通信有限公司 | Circuit board and electronic device |
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| CN109755729A (en) * | 2018-12-11 | 2019-05-14 | 上海电力学院 | A kind of dual-attenuation ultra wide band mimo antenna flexible |
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| WO2022213995A1 (en) * | 2021-04-09 | 2022-10-13 | 维沃移动通信有限公司 | Circuit board and electronic device |
| CN114243278A (en) * | 2021-12-15 | 2022-03-25 | 杭州电子科技大学 | Four-trap high-isolation ultra-wideband MIMO antenna |
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