CN205211936U - Controllable UWB MIMO antenna of trapped wave bandwidth - Google Patents
Controllable UWB MIMO antenna of trapped wave bandwidth Download PDFInfo
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- CN205211936U CN205211936U CN201521004868.5U CN201521004868U CN205211936U CN 205211936 U CN205211936 U CN 205211936U CN 201521004868 U CN201521004868 U CN 201521004868U CN 205211936 U CN205211936 U CN 205211936U
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- minor matters
- mimo antenna
- medium substrate
- floor
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Abstract
The utility model discloses a controllable UWB MIMO antenna of trapped wave bandwidth, including the medium base plate, two rectangle radiating element are openly printed to the medium base plate, two rectangle radiating element still include two input feeders about medium base plate central symmetry, the input feeder is connected with rectangle radiating element, the input feeder outside sets up parasitic strip, L shape minor matters are sold up in rectangle radiating element's outside extension, the back printing floor of medium base plate. The utility model discloses the trapped wave bandwidth is controllable to an interference frequency that is used for other different bandwidth of filtering.
Description
Technical field
The utility model relates to mobile communication technology field, is specifically related to the UWB MIMO antenna that a kind of notch bandwidth is controlled.
Background technology
Along with developing rapidly of Modern wireless communication technology, the requirement of mobile communication system to antenna is more and more higher, designs the focus that the Novel ultra wide band mimo antenna with high-frequency selectivity and controllable bandwidth trap characteristic is Recent study.Multiple-input, multiple-output Multiple-input-multiple-output (MIMO) technology, because channel capacity can be increased significantly, do not need extra increase spectral range and input power simultaneously, day by day become the important research direction that Antenna Design is new.Ultra broadband ultra-wideband (UWB) a kind ofly has very wide available frequency range, 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, in order to filtering interfering frequency effectively, and avoid the extra volume increasing the circuit overall structure that filter brings in antenna back-end circuit to increase, need antenna to have filter function.In order to filtering interfering frequency neatly, need antenna to have high-frequency and select trap characteristic; In order to energy filtering has the interfering frequency of different frequency bands width, antenna is needed to have the controlled trap characteristic of notch bandwidth.Therefore, design has the Novel ultra wide band mimo antenna of high-frequency selectivity and controllable bandwidth trap characteristic, is current research tendency.Such as, be operated in ultra wideband frequency 3.1GHz-10.6GHz, simultaneously can the ultra broadband mimo antenna of the 5.15GHz-5.85GHz frequency range of filtering IEEE802.11 WLAN (wireless local area network) wirelesslocalareanetwork (WLAN) effectively.
The miniaturized ultra broadband mimo antenna with high-frequency selectivity and controllable bandwidth trap characteristic be a kind of can the array antenna of effective filtering interfering frequency range.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 single order trap, and notch band edge abruptness is inadequate, can only in very narrow frequency range the frequency of effective whole interference band of filtering, filtering characteristic is poor.And notch band width is uncontrollable, that is to say the adjustment that the left and right sides frequency of notch band cannot be independently controlled, cause the antenna scope of application little.Therefore, design has second order trap characteristic, and the Novel ultra wide band mimo antenna with high-frequency selectivity and controllable bandwidth trap characteristic becomes inevitable direction.
Utility model content
Traditional have in the ultra broadband mimo antenna of trap characteristic to solve, the selecting frequency characteristic difference caused due to the single order trap characteristic of single resonator and the left and right sides frequency of notch band cannot be independently controlled the inconvenience that brings of adjustment, the UWB MIMO antenna that the utility model provides a kind of notch bandwidth controlled.
The utility model adopts traditional feed microstrip line method, utilize the parasitic bar of inverted L-shaped minor matters and outside to load simultaneously, and then when not increasing overall antennas sizes, second order notch band is realized within the scope of ultra wideband frequency 3.1GHz-10.6GHz, thus realize the 5.15GHz-5.85GHz band interference of filtering IEEE802.11 WLAN (wireless local area network) wirelesslocalareanetwork (WLAN) efficiently, simultaneously the width of notch band can the target of independent regulation.And extend isolation between feed port that minor matters improve full frequency band by designing the cumulative floor of width, obtain isolation between higher input feed port.Entire physical compact dimensions, structure is simple, and processing and manufacturing cost is low, and engineering practicability is high.
The utility model adopts following technical scheme:
The UWB MIMO antenna that a kind of notch bandwidth is controlled, comprise medium substrate, two rectangular radiation element are printed in described medium substrate front, described two rectangular radiation element are about medium substrate Central Symmetry, also comprise two input feeder lines, described input feeder line is connected with rectangular radiation element, the parasitic bar of described input feeder line arranged outside, inverted L-shaped minor matters are extended in the outside of described rectangular radiation element, the printing floor, the back side of described medium substrate.
Described floor is extended the extension minor matters that width is cumulative, described extension minor matters are connected with floor, and described extension minor matters are symmetrical about medium substrate center line.
The length of described parasitic bar is 18mm.
The length of described inverted L-shaped minor matters is 9.1mm.
Described input feeder line is the microstrip line of characteristic impedance 50 ohm.
Parasitic bar and inverted L-shaped minor matters jointly load and form second order trap.
Described floor is rectangle.
The beneficial effects of the utility model:
(1) completely covers ultra wideband frequency by the structure of plane, 3.1GHz-10.6GHz, simultaneously can filtering three interference bands effectively: the 5.15GHz-5.85GHz of IEEE802.11 WLAN (wireless local area network) wirelesslocalareanetwork (WLAN).The most important thing is, define second order trap owing to loading two resonators, make the frequency selectivity within the scope of 5.15GHz-5.85GHz high, the edge of trap band is precipitous.Meanwhile, notch bandwidth is controlled, adds the scope of application of antenna.
(2) planar dimension of whole antenna, comprising floor is 32mm × 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 upper and lower marginal frequency of notch band can independently regulate flexibly, and namely notch bandwidth is controlled, thus for the interfering frequency of other different bandwidths of filtering.
Accompanying drawing explanation
Fig. 1 is the structural representation of the controlled UWB MIMO antenna of a kind of notch bandwidth of the utility model;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the upward view of Fig. 1;
Fig. 4 is the end view of Fig. 1;
Fig. 5 is return loss and the frequency relation figure of the emulation of the utility model embodiment;
Fig. 6 is interport isolation and the frequency relation figure of the emulation of the utility model embodiment.
Fig. 7 is the gain diagram of the utility model embodiment emulation.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment
In the present embodiment, outside refers to away from medium substrate center line side, and inner side refers near medium substrate center line side.
As shown in Figure 1, the UWB MIMO antenna that notch bandwidth is controlled, comprises medium substrate, and two rectangular radiation element 1,2 are printed in described medium substrate front, and about medium substrate Central Symmetry, printing floor, the described medium substrate back side 9, also comprise two input feeder lines 3,4, input feeder line is connected with rectangular radiation element, and one_to_one corresponding, the parasitic bar 5,6 of every bar input feeder line arranged outside, its total length is all 18mm, is equivalent to the mode resonances of half-wavelength near WLAN5.2GHz.
Inverted L-shaped minor matters 7,8 are extended in the outside of described rectangular radiation element, and near medium substrate edge, length is all 9.1mm, is equivalent to quarter-wave mode resonances near WLAN5.8GHz.
The inverted L-shaped minor matters 7,8 of extending outside described parasitic bar 5,6 and rectangular radiation element, common loading forms second order trap, thus can filtering interfering frequency range effectively: the 5.15GHz-5.85GHz of IEEE802.11 WLAN (wireless local area network) wirelesslocalareanetwork (WLAN), in the present embodiment, parasitic bar selects class similar C-shaped, and parasitic bar end opening part is longer, and extend laterally, filtration result is best.
Described floor 9 is printed the extension minor matters 10 that width is cumulative, described extension minor matters 10 are connected with floor 9, described extension minor matters 10 are symmetrical about medium substrate center line, described extension minor matters increase the isolation regulating whole ultra broadband frequency band gradually, and described floor is for simulating the circuit board of miniaturized Wireless Telecom Equipment.
Described input feeder line 5,6 is the microstrip line of characteristic impedance 50 ohm.
As shown in Figure 2, Figure 3 and Figure 4, the thickness H=0.8 of medium substrate, the distance d at feeder line and medium substrate left and right sides edge
f=5.8, the longitudinal length L=26 of medium substrate, the longitudinal length L of floor level rectangle part
g1=11, extend minor matters Part I longitudinal length L from bottom to top
g2=9, floor extends minor matters Part II longitudinal length L from bottom to top
g3=4.5, floor extends minor matters Part III longitudinal length L from bottom to top
g4=1.5, the longitudinal length L of parasitic bar outside input feeder line
c1=8, the longitudinal length L of the opening part of parasitic bar outside input feeder line
c2=1.6, the distance L of the downside of parasitic bar and the lower limb of medium substrate outside input feeder line
c3=1.8, the longitudinal length L of rectangular radiation element
r=9.8, the longitudinal length L of the inverted L-shaped minor matters of extending outside rectangular radiation element
r1=8.3, the longitudinal length L of feeder line
f=12, the transverse width W=32 of medium substrate, extend minor matters Part I transverse width W from bottom to top
g2=2.8, floor extends minor matters Part II transverse width W from bottom to top
g3=4.2, floor extends minor matters Part III transverse width W from bottom to top
g4=10, the end length W of parasitic bar outside feeder line
c1=1, the width W of parasitic bar outside feeder line
c2=0.5, the spacing W of parasitic bar and feeder line outside feeder line
c3=0.3, the transverse width W of parasitic bar outside feeder line
c4=2, the transverse width W of rectangular radiation patch
r=11, the transverse width W of the inverted L-shaped minor matters of extending outside rectangular radiation patch
r1=1.1, the minor matters width W of the inverted L-shaped minor matters of extending outside rectangular radiation patch
r2=0.3, the transverse width W of input feeder line
f=1.6.
The utility model 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 patch radiating 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 with high-frequency selectivity and controllable bandwidth characteristic, thus filtering interfering frequency range effectively: the 5.15GHz-5.85GHz of IEEE802.11 WLAN (wireless local area network) wirelesslocalareanetwork (WLAN), and can be used for the interfering frequency of different frequency bands width.One is, in the outside of two input feeder lines, add parasitic bar 5,6, total length is all 18mm, is equivalent to the mode resonances of half-wavelength near WLAN5.2GHz; Two are, the inverted L-shaped minor matters 7,8 of extending in the outside of two rectangular radiation element, and total length is all 9.1mm, is equivalent to quarter-wave mode resonances near WLAN5.8GHz.Loading while these two resonators can effective filtering interfering frequency, and regulate the length of two resonators respectively, the left and right sides frequency of notch band can realize the controlled adjustment of independence, thus reaches the controlled target of notch band width simultaneously.
Realize high interport isolation again.By extending the cumulative extension minor matters 10 of width in the middle, the back side of medium substrate, the antenna pattern that a port can be made to produce is reflected, utilize these extension 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-15dB, effectively achieve the mutual minimum interference between different port.
In order to verify the validity of the utility model scheme, 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 medium substrate is 32mm × 26mm.Floor is of a size of 32mm × 11mm.Antenna radiation unit is planar rectangular structure, is positioned at the front of medium substrate, and the planar dimension taken is 11mm × 9.8mm.Input feeder line 3,4 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-12GHz, and completely covers ultra wideband frequency has all available frequency bands in 3.1GHz-10.6GHz frequency range.Simultaneously filtering three interference bands effectively: the 5.15GHz-5.85GHz of IEEE802.11 WLAN (wireless local area network) wirelesslocalareanetwork (WLAN).
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-15dB, meets actual needs completely.The ELECTROMAGNETIC REFLECTION effect that the cumulative extension minor matters 10 of width produce and the new mode of resonance extending minor matters 10 generation are extended in this middle, the back side having benefited from dielectric-slab.
The gain of the antenna emulation made with above-mentioned 3 figure illustrated dimension as shown in Figure 7.Antenna gain is fluctuating between 1.6-4.1dBi, acutely reduces at 5.15GHz-5.85GHz notch band.Achieve the target of filtering interfering frequency effectively.
From technique scheme, antenna described in the utility model achieves the covering of ultra wideband frequency (3.1GHz-10.6GHz) and has the notch band of high-frequency selectivity and controllable bandwidth characteristic in the plane space of 32mm × 26mm, and have high-isolation between port, meet mobile communication system to the design requirement for mobile terminal antenna.
Above-described embodiment is the utility model preferably execution mode; but execution mode of the present utility model is not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.
Claims (7)
1. the UWB MIMO antenna that a notch bandwidth is controlled, it is characterized in that, comprise medium substrate, two rectangular radiation element are printed in described medium substrate front, and described two rectangular radiation element, about medium substrate Central Symmetry, also comprise two input feeder lines, described input feeder line is connected with rectangular radiation element, the parasitic bar of described input feeder line arranged outside, inverted L-shaped minor matters are extended in the outside of described rectangular radiation element, the printing floor, the back side of described medium substrate.
2. UWB MIMO antenna according to claim 1, is characterized in that, described floor is extended the extension minor matters that width is cumulative, and described extension minor matters are connected with floor, and described extension minor matters are symmetrical about medium substrate center line.
3. UWB MIMO antenna according to claim 1, is characterized in that, the length of described parasitic bar is 18mm.
4. UWB MIMO antenna according to claim 1, is characterized in that, the length of described inverted L-shaped minor matters is 9.1mm.
5. UWB MIMO antenna according to claim 1, is characterized in that, described input feeder line is the microstrip line of characteristic impedance 50 ohm.
6. UWB MIMO antenna according to claim 1, is characterized in that, parasitic bar and inverted L-shaped minor matters jointly load and form second order trap.
7. UWB MIMO antenna according to claim 1, is characterized in that, described floor is rectangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521004868.5U CN205211936U (en) | 2015-12-04 | 2015-12-04 | Controllable UWB MIMO antenna of trapped wave bandwidth |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521004868.5U CN205211936U (en) | 2015-12-04 | 2015-12-04 | Controllable UWB MIMO antenna of trapped wave bandwidth |
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| CN205211936U true CN205211936U (en) | 2016-05-04 |
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| CN201521004868.5U Expired - Fee Related CN205211936U (en) | 2015-12-04 | 2015-12-04 | Controllable UWB MIMO antenna of trapped wave bandwidth |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406182A (en) * | 2015-12-04 | 2016-03-16 | 华南理工大学 | UWB (Ultra Wide Band) MIMO (Multiple Input Multiple Output) antenna with controlled trap bandwidth |
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2015
- 2015-12-04 CN CN201521004868.5U patent/CN205211936U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406182A (en) * | 2015-12-04 | 2016-03-16 | 华南理工大学 | UWB (Ultra Wide Band) MIMO (Multiple Input Multiple Output) antenna with controlled trap bandwidth |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160504 Termination date: 20181204 |