CN204067576U - A kind of dual-band antenna of the loading artificial magnetic conductor structure for body area network - Google Patents
A kind of dual-band antenna of the loading artificial magnetic conductor structure for body area network Download PDFInfo
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- CN204067576U CN204067576U CN201420529603.6U CN201420529603U CN204067576U CN 204067576 U CN204067576 U CN 204067576U CN 201420529603 U CN201420529603 U CN 201420529603U CN 204067576 U CN204067576 U CN 204067576U
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Abstract
The utility model discloses a kind of dual-band antenna of the loading artificial magnetic conductor structure for body area network, comprise antenna radiation unit, coplanar wave guide feedback structure, artificial magnetic conductor structure and flexible dielectric substrate, antenna radiation unit comprises, lower annulus paster and oval paster, artificial magnetic conductor structure is loaded into immediately below antenna, described artificial magnetic conductor structure is by artificial magnetic conductor medium substrate, the circular patch unit of periodic arrangement and the metal floor being etched in the artificial magnetic conductor medium substrate back side are formed, circular patch unit is made up of annulus paster and the 3rd circular patch that is positioned at annulus paster inside, the double frequency annular printed monopole antenna of the loading artificial magnetic conductor structure of the utility model design is operated in industrial scientific medical frequency range, there is flexibility, low section, high-gain, the features such as directed radiation, easily and human body conformal, simultaneously, this antenna has lower backward radiation, reduce the radiation of antenna to human body.
Description
Technical field
The utility model relates to wireless communication field, is specifically related to a kind of dual-band antenna of the loading artificial magnetic conductor structure for body area network.
Background technology
In recent years, along with the fast development of wireless communication technology, the Wireless Telecom Equipment of human peripheral gets more and more, and the application demand of people to wireless communication technology also improves day by day.Wireless human body local area network system can meet the fields such as physical culture, medical treatment, amusement and military affairs well and carry out measuring in real time the demand with monitoring to people's vital sign, becomes one of focus direction in next generation mobile communication technical research gradually.Wireless human body local area network is attached to human body a kind of network with it, and it is centered by human body, is made up of the transducer and personal data collecting and processing unit being distributed in human body surface or implant into body inside, to gather for the purpose of the various physiological parameter of human body.By wireless human body local area network, the personal electronic equipments (as mobile phone, PDA etc.) that individual not only can carry with it with it communicates, and can also communicate, become a part for whole communication network with other data communication network terminal.One of key technology of body area network is the design of human body local area network antenna.The exploitation of human body local area network antenna is different from our antenna equipment of ordinary use, except human figure change brings impact to antenna electromagnetic wave propagation, also must consider this very complicated electromagnetic system of human body itself.The biological tissue that human body is different by various shape, electromagnetic property is different is formed, and, heterogeneously there is consumption dispersive medium in most of biological tissue, the electric parameters such as the conductivity of these tissues and dielectric constant change along with the change of frequency, temperature, institutional framework and water content etc., and the body of these characteristics and human body complexity together constitutes the boundary condition of antenna electric wave traveling.Meanwhile, the antenna being applied to human body local area network also will reduce the radiation of antenna to human body.Therefore, based on the reciprocal effect of human body and antenna and the antenna carrying out designing have great significance.
Planographic monopole antenna refers to a kind of conductor microstrip line (its length is about quarter-wave usually) being printed on medium substrate surface, and its root connects feeder line, and its effect and radiation are similar to dipole.Planographic monopole antenna has the advantages such as low section, easily processing, size are little, is applicable to require that antenna thickness is thin, the occasion that size is little, as implantable medical, Wearable electronic equipment, compact entertainment equipment etc.
Antenna has multiple feeding classification, and that commonly uses has the modes such as coaxial feeding, feed microstrip line and coplanar wave guide feedback.Coplanar waveguide structure is made up of (microstrip line and floor are positioned at substrate the same side) middle 50 Ω microstrip lines and floor, both sides.In addition, in order to tackle power problems, floor can be added at the substrate back of planar waveguiding structure, which forms coplanar waveguide ground (Grounded Coplanar Waveguide, GCPW) structure.
Artificial magnetic conductor structure is the array structure of a kind of two-dimensional and periodic arrangement, and itself does not absorb energy, but can play the effect of reflecting in the same way.It is made up of the periodic structure and the floor be positioned at below substrate that are positioned at surface.Be different from 180 ° of reflected phase will characteristics of perfact conductor structure, reflected phase will change from-180 ° to 180 ° of artificial magnetic conductor structure, we choose the phase place of-90 ° to 90 ° usually as available band gap.If use the perfact conductor with 180 ° of reflected phase will as reflecting plate, in order to make incoming signal and reflected signal in the same way, reflecting plate needs distance antenna 1/4 operation wavelength.But during the artificial magnetic conductor using phase place to change from-90 ° to 90 °, the distance of reflecting plate distance antenna will be less than 1/4 operation wavelength, thus reach the effect reducing antenna section.
Utility model content
In order to overcome the shortcoming of prior art existence with not enough, the utility model provides a kind of dual-band antenna of the loading artificial magnetic conductor structure for body area network.
The utility model adopts following technical scheme:
A kind of dual-band antenna of the loading artificial magnetic conductor structure for body area network, comprise double frequency annular printed monopole antenna and artificial magnetic conductor structure, described artificial magnetic conductor structure is positioned at immediately below double frequency annular printed monopole antenna, described double frequency annular printed monopole antenna comprises antenna radiation unit, coplanar wave guide feedback structure and flexible dielectric substrate, described antenna radiation unit comprises annulus paster, lower annulus paster and oval paster, described upper annulus paster is connected with the top of lower annulus paster, it is inner that described oval paster is positioned at lower annulus paster, and be connected with lower annulus paster top, described coplanar wave guide feedback structure is made up of floor and the 50 Ω microstrip lines that are arranged on centre position, floor, described artificial magnetic conductor structure is by artificial magnetic conductor medium substrate, the circular patch unit of periodic arrangement and the metal floor being etched in the artificial magnetic conductor medium substrate back side are formed, the circular patch unit of described periodic arrangement is etched in the front of artificial magnetic conductor medium substrate, described antenna radiation unit and coplanar wave guide feedback structure are etched in the same face of flexible dielectric substrate.
The inner ring radius of described upper annulus paster is 1.6mm, and width is 1mm, and the inner ring radius of lower annulus paster is 11mm, width 1.5mm.
Described circular patch unit is made up of annulus paster and the 3rd circular patch that is positioned at annulus paster inside, and described 3rd circular patch and annulus paster are concentric circles.
The distance on described 50 Ω microstrip line distance floors, both sides is 0.05mm, and described 50 Ω microstrip lines are connected with the bottom of lower annulus paster.
The outer shroud radius of described annulus paster is 32.5mm, and the radius of the 3rd circular patch is 17.5mm, and the inner ring distance of described 3rd circular patch and annulus paster is 2mm.
The beneficial effects of the utility model:
(1) general many radiation minor matters are the keys realizing multiband antenna, and this utility model utilizes a large circle as primary radiation minor matters, achieves two-frequency operation, and structure is simple, avoids the use of complicated minor matters;
(2) due to the radiation effects in the same way of artificial magnetic conductor, compare the antenna of existing employing perfact conductor as reflecting plate, this antenna has low section characteristic.When the antenna of loading artificial magnetic conductor is placed on human body, its low-frequency range (2.4-2.48GHz) reaches 11.8dBi and 8dBi respectively with the average gain of high band (5.725-5.85GHz).On free space, human body and under case of bending, antenna all has good radiation characteristic.This antenna has use value, and can be widely used in body area network, BAN's system;
(3) artificial magnetic conductor unit achieves dual frequency characteristics by an outside annulus paster and an inner circular patch, and compared to common square structure unit, its size is less, is beneficial to the Miniaturization Design of antenna.Regulate the radius just reflected phase will of energy accommodation reflex plate at corresponding frequency place of annulus paster and circular patch;
(4) the double frequency annular printed monopole antenna loading artificial magnetic conductor structure has the features such as flexibility, double frequency, low section, high-gain, directed radiation, easily and human body conformal, meanwhile, this antenna has lower backward radiation, reduces the radiation of antenna to human body.
Accompanying drawing explanation
Fig. 1 is structure and parameters schematic diagram of the present utility model;
Fig. 2 (a) is artificial magnetic conductor structural representation, and Fig. 2 (b) is the structural representation of circular patch unit;
Fig. 3 is the S11 schematic diagram of the utility model on free space and human body;
Fig. 4 (a) is the utility model upper XOY plane antenna pattern at free space and human body when frequency is 2.45G;
Fig. 4 (b) is the utility model upper YOZ plane radiation patterns at free space and human body when frequency is 2.45G;
Fig. 4 (c) is the utility model upper XOY plane antenna pattern at free space and human body when frequency is 5.8G;
Fig. 4 (d) is the utility model upper YOZ plane radiation patterns at free space and human body when frequency is 5.8G.
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
As shown in Figure 1, a kind of dual-band antenna of the loading artificial magnetic conductor structure for body area network, comprise antenna radiation unit, coplanar wave guide feedback structure, artificial magnetic conductor structure and flexible dielectric substrate 6, described antenna radiation unit is by upper, the annulus paster that lower two radiuses are different and oval paster 3 are formed, described coplanar wave guide feedback line is made up of floor 5 and the 50 Ω microstrip lines 4 that are arranged on centre position, floor, described 50 Ω microstrip lines are connected with the bottom of lower annulus paster, described artificial magnetic conductor structure is by artificial magnetic conductor medium substrate 9, the circular patch unit of periodic arrangement and the metal floor 10 being etched in the artificial magnetic conductor medium substrate back side are formed, the circular patch unit of described periodic arrangement is etched in the front of artificial magnetic conductor medium substrate 9, described antenna radiation unit and coplanar wave guide feedback structure are etched in the same face of flexible dielectric substrate 6.
Described lower annulus paster plays main dual frequency radiation effect, regulating antenna at the resonance point of high frequency (5.725-5.85GHz) by introducing upper annulus paster 2, regulating the impedance matching of high band simultaneously by adding the oval paster 3 connected with lower annulus paster 1.
As shown in Fig. 2 (a), Fig. 2 (b), described each circular patch unit is made up of annulus paster 8 and the 3rd circular patch 7 that is positioned at annulus paster inside, described 3rd circular patch 7 is concentric circles with annulus paster, the outside large circle of described circular patch unit controls the reflected phase will in the same way of low-frequency range, and the 3rd inner circular patch controls the reflected phase will in the same way of high band.
Artificial magnetic conductor structure is carried in immediately below double frequency annular printed monopole antenna, described double frequency annular printed monopole antenna comprises antenna radiation unit, coplanar wave guide feedback structure and flexible dielectric substrate, in the middle of double-band printed one pole sub antenna with artificial magnetic conductor structure, add ethylene vinyl acetate foam to avoid the antenna impedance mismatch caused because both directly contact.The relative dielectric constant of ethylene vinyl acetate foam is 1.17, and electrical loss angle is 0.04, and thickness is 2mm.
In described antenna radiation unit, the inner ring radius r 2 of upper annulus paster 2 is 1.6mm, width d2 is 1mm, and the inner ring radius r 1 of lower annulus paster 1 is 11mm, and width d1 is 1.5mm, the minor axis ra of oval paster 3 is 2mm, major axis rb is 4mm, and the width d of 50 Ω microstrip lines 4 is 3.5mm, and the length L1 on floor 5 is 16.8mm, the width W 1 on floor is 12mm, and the gap g between 50 Ω microstrip lines and floor is 0.5mm.Flexible dielectric substrate 6 adopts Panasonic R-F770 material, and its relative dielectric constant is 3.2, electrical loss angle is 0.002.The length L of flexible dielectric substrate is 47.5mm, and width W is 28.5mm, and thickness h is 0.05mm.
As shown in Fig. 2 (a), Fig. 2 (b), described artificial magnetic conductor structure is made up of the circular patch unit of artificial magnetic conductor medium substrate 9, periodic arrangement and the metal floor 10 that is etched in the artificial magnetic conductor medium substrate back side, the circular patch unit of described periodic arrangement is etched in the front of artificial magnetic conductor medium substrate 9, the front of artificial magnetic conductor structure is by the square structure of the circular patch unit periodic arrangement of 3 × 3, the back side is metal floor, and artificial magnetic conductor medium substrate 9 is flexible ethylene base (vinyl) plastics.The length L1 of artificial magnetic conductor structure is 102mm.Circular patch unit is by annulus paster and be positioned at the 3rd inner circular patch and form.By loading double frequency artificial magnetic conductor structure immediately below antenna, decreasing the backward radiation of antenna, increasing the forward gain of antenna simultaneously.The outside large circle paster of circular patch unit produces the reflected phase will in the same way of low-frequency range, and the 3rd inner circular patch produces the reflected phase will in the same way of high band.By regulating the outer radius R1 of outside annulus paster, the radius R 2 of inner circular paster and the spacing distance S of annulus paster and circular patch, achieve 0 ° of reflected phase will at the centre frequency 2.45GHz of low frequency and the centre frequency 5.8GHz place of high frequency.The outer radius R1 of described annulus paster is 32.5mm, and the radius R 2 of inner circular paster is 17.5mm, and the interval S of inner circular paster and outside annulus paster is 2mm.The flexible vinyl substrate that flexible vinyl substrate relative dielectric constant is 2.5, electrical loss angle is 0.002 circular patch unit employing is square, and length of side Lm is 34mm, and thickness h 1 is 1.7mm.
As shown in Fig. 4 (a) ~ 4 (d) and Fig. 3, the double frequency annular printed monopole antenna loading artificial magnetic conductor structure has lower backward radiation on free space and human body, reduces the radiation effect of antenna to human body.
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 (5)
1. the dual-band antenna for the loading artificial magnetic conductor structure of body area network, it is characterized in that, comprise double frequency annular printed monopole antenna and artificial magnetic conductor structure, described artificial magnetic conductor structure is positioned at immediately below double frequency annular printed monopole antenna, described double frequency annular printed monopole antenna comprises antenna radiation unit, coplanar wave guide feedback structure and flexible dielectric substrate, described antenna radiation unit comprises annulus paster, lower annulus paster and oval paster, described upper annulus paster is connected with the top of lower annulus paster, it is inner that described oval paster is positioned at lower annulus paster, and be connected with lower annulus paster top, described coplanar wave guide feedback structure is made up of floor and the 50 Ω microstrip lines that are arranged on centre position, floor, described artificial magnetic conductor structure is by artificial magnetic conductor medium substrate, the circular patch unit of periodic arrangement and the metal floor being etched in the artificial magnetic conductor medium substrate back side are formed, the circular patch unit of described periodic arrangement is etched in the front of artificial magnetic conductor medium substrate, described antenna radiation unit and coplanar wave guide feedback structure are etched in the same face of flexible dielectric substrate.
2. the dual-band antenna of a kind of loading artificial magnetic conductor structure for body area network according to claim 1, it is characterized in that, the inner ring radius of described upper annulus paster is 1.6mm, and width is 1mm, and the inner ring radius of lower annulus paster is 11mm, width 1.5mm.
3. the dual-band antenna of a kind of loading artificial magnetic conductor structure for body area network according to claim 1, it is characterized in that, described circular patch unit is made up of annulus paster and the 3rd circular patch that is positioned at annulus paster inside, and described 3rd circular patch and annulus paster are concentric circles.
4. the dual-band antenna of a kind of loading artificial magnetic conductor structure for body area network according to claim 1, is characterized in that, the distance on described 50 Ω microstrip line distance floors, both sides is 0.05mm, and described 50 Ω microstrip lines are connected with the bottom of lower annulus paster.
5. the dual-band antenna of a kind of loading artificial magnetic conductor structure for body area network according to claim 3, it is characterized in that, the outer shroud radius of described annulus paster is 32.5mm, and the radius of the 3rd circular patch is 17.5mm, and the inner ring distance of described 3rd circular patch and annulus paster is 2mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420529603.6U CN204067576U (en) | 2014-09-15 | 2014-09-15 | A kind of dual-band antenna of the loading artificial magnetic conductor structure for body area network |
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| CN201420529603.6U CN204067576U (en) | 2014-09-15 | 2014-09-15 | A kind of dual-band antenna of the loading artificial magnetic conductor structure for body area network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269615A (en) * | 2014-09-15 | 2015-01-07 | 华南理工大学 | Dual-band antenna loaded with manual magnetic conductor structure and used for body area network |
| CN107453047A (en) * | 2016-05-06 | 2017-12-08 | 通用汽车环球科技运作有限责任公司 | Double frequency-band flexible antennas with segmented surface processing |
| WO2019218590A1 (en) * | 2018-05-17 | 2019-11-21 | 华南理工大学 | Filtering antenna for wearable apparatus |
-
2014
- 2014-09-15 CN CN201420529603.6U patent/CN204067576U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269615A (en) * | 2014-09-15 | 2015-01-07 | 华南理工大学 | Dual-band antenna loaded with manual magnetic conductor structure and used for body area network |
| CN107453047A (en) * | 2016-05-06 | 2017-12-08 | 通用汽车环球科技运作有限责任公司 | Double frequency-band flexible antennas with segmented surface processing |
| CN107453047B (en) * | 2016-05-06 | 2020-09-04 | 通用汽车环球科技运作有限责任公司 | Dual band flexible antenna with segmented surface treatment |
| WO2019218590A1 (en) * | 2018-05-17 | 2019-11-21 | 华南理工大学 | Filtering antenna for wearable apparatus |
| US11855329B2 (en) | 2018-05-17 | 2023-12-26 | South China University Of Technology | Filtering antenna for wearable apparatus |
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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 |
Granted publication date: 20141231 Termination date: 20170915 |
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| CF01 | Termination of patent right due to non-payment of annual fee |