CN103682641A - Small-sized ferrite chip antenna - Google Patents
Small-sized ferrite chip antenna Download PDFInfo
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- CN103682641A CN103682641A CN201310741829.2A CN201310741829A CN103682641A CN 103682641 A CN103682641 A CN 103682641A CN 201310741829 A CN201310741829 A CN 201310741829A CN 103682641 A CN103682641 A CN 103682641A
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Abstract
The invention discloses a small-sized ferrite chip antenna. The small-sized ferrite chip antenna comprises: a base ferrite diaphragm, upper slash segments, lower slash segments and metal connecting bars, wherein one or more upper slash segments are obliquely arranged above the base ferrite diaphragm and one or more lower slash segments are obliquely arranged below the base ferrite diaphragm. The upper slash segments are connected with the lower slash segments with the metal connecting bars positioned in the base ferrite diaphragm so as to form a spiral coil wound around a horizontal axis. An upper surface diaphragm is arranged above the upper slash segment, a lower surface diaphragm is arranged below the lower slash segment, a surface electrode is arranged above the upper surface diaphragm and a bottom electrode is arranged below the lower surface diaphragm. The surface electrode and the bottom electrode are connected with each end of the spiral coil by the metal connecting bars. According to this arrangement, the antenna is wound around the horizontal axis, so that the magnetic field of the antenna is parallel to grooves and the attenuation caused by being orthogonal to the grooves can be avoided.
Description
Technical field
The present invention discloses a kind of antenna, relates in particular to a kind of small-sized ferrite chip antenna that is applicable to card, label and handhold read-write device.
Background technology
In recent years, along with radio RF recognition technology (RFID), the short distance wireless communication technology (NFC) etc. has had increasing application.In order to communicate between the mobile electronic devices such as mobile phone or between mobile electronic device and read write line, in prior art conventional solution be on mobile electronic device equipment with communication antenna can identification card, generally, this can being installed in the metal draw-in groove of mobile electronic device by identification card.Please refer to accompanying drawing 1 to Fig. 3, Fig. 1 to Fig. 3 means the abbreviation of the English Printed wire of equipment PWB(board, official translation is printed substrate) card 11 of antenna 13 is at the schematic diagram of the form of the communication of 12 li of draw-in grooves, in the example of Fig. 3, in the electromagnetic wave of PWB antenna 13 transmittings that card is 11 li, most magnetic field H and metal draw-in groove 12 quadratures, be subject to the attenuations such as metallic reflection, absorption, and its intensity can decline to a great extent.Therefore,, under the environment of metal draw-in groove 12, finally obtain magnetic field H 2 and be far smaller than card in free space acquisition magnetic field H 1.
Summary of the invention
For the antenna of the above-mentioned radio RF recognition technology of the prior art (RFID) of mentioning, the short distance wireless communication technology (NFC) etc. in use, effect due to metal draw-in groove, can make the shortcoming of magnetic field intensity decay, the invention provides a kind of new antenna that trunnion axis forms as roll coiling of take, this antenna produces the magnetic field that is parallel to draw-in groove, avoids causing decay with draw-in groove quadrature.
The technical scheme that the present invention solves its technical problem employing is: a kind of small-sized ferrite chip antenna, antenna comprises ferrite matrix diaphragm, upper oblique line section, declivity line segment and metal joint pin, ferrite matrix diaphragm top is provided with the more than one upper oblique line section being obliquely installed, ferrite matrix diaphragm below is provided with the more than one declivity line segment being obliquely installed, upper oblique line section and declivity line segment interconnect by the metal joint pin being arranged in ferrite matrix diaphragm, thereby form one and take the spiral coil of trunnion axis as coiling axle, above upper oblique line section, be provided with upper surface diaphragm, below declivity line segment, be provided with lower surface diaphragm, above upper surface diaphragm, be provided with surface electrode, below lower surface diaphragm, be provided with bottom-side electrodes, the two ends of spiral coil are connected with an electrode by metal joint pin respectively.
The technical scheme that the present invention solves its technical problem employing further comprises:
Described antenna is cuboid, and helical coil is along the long side direction setting of antenna or along the short side direction setting of antenna.
Described surface electrode and bottom-side electrodes are respectively equipped with 10, and 10 electrodes are two rows and arrange, and are uniformly distributed respectively along antenna end long side direction.
Described upper oblique line section be arranged in parallel.
Described declivity line segment be arranged in parallel.
The invention has the beneficial effects as follows: the antenna that trunnion axis forms as roll coiling is take in the present invention, this antenna produces the magnetic field that is parallel to draw-in groove, avoids causing decay with draw-in groove quadrature.
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Accompanying drawing explanation
Fig. 1 represents to have PWB aerial mounting structure schematic diagram in prior art.
Fig. 2 be in prior art, represent to have PWB antenna can the communication form of identification card in free space schematic diagram.
Fig. 3 be in prior art, represent to have PWB antenna can the communication form of identification card in metal draw-in groove figure.
Fig. 4 is the schematic diagram with the form of can identification card communicating by letter in metal draw-in groove of antenna of the present invention.
Fig. 5 is the antenna structure view of embodiments of the present invention 1.
Fig. 6 is the antenna structure view of embodiments of the present invention 2.
Fig. 7 is the antenna structure view of embodiments of the present invention 3.
Fig. 8 is the antenna structure view of embodiments of the present invention 4.
Embodiment
The present embodiment is the preferred embodiment for the present invention, and other all its principles are identical with the present embodiment or approximate with basic structure, all within protection range of the present invention.
Antenna in the present invention is mainly used in high frequency (HF) frequency range, by ferrite matrix and in the coil that is embedded in matrix form, it adopts LTCC production technology to make, cost is low, is suitable for producing in enormous quantities.Antenna in the present invention uses Ferrite Material, adopts LTCC production technology to be made, and utilizes LTCC technique, easily in compact size, realizes horizontal coiling.Ferrite antenna comprises ferrite matrix and be embedded in the wire coil in matrix, and the ferrite powder that matrix adopting magnetic permeability is 70 ~ 200 is made, and can effectively strengthen magnetic field intensity, further reduces antenna volume.
To antenna structure of the present invention be described further with several concrete execution modes below.
Embodiment mono-: please refer to accompanying drawing 5, first, according to different designing requirements, adopt different magnetic permeabilitys ferrite powder, add adhesive, plasticizer, dispersant etc., various base-materials are carried out to ball milling in ball mill and be prepared into casting slurry, in the present embodiment, magnetic permeability is preferably 70 ~ 200.Then, adopt LTCC wet processing to carry out laminated, in the present embodiment, antenna integral body is stacked and is formed by 5 layers of ferrite diaphragm 27 as shown in Figure 5; Concrete steps are as follows: 1, on salivation support plate, stick one deck MIRA paper, utilize screen printing technique to print metal pattern on MIRA paper, form bottom-side electrodes 21, in the present embodiment, antenna integral body is cuboid, bottom-side electrodes 21 is provided with 10, and (not necessarily 10 of number of poles are to be generally even number to be symmetrical arranged.Number of electrodes arranges the Size dependence of how many and antenna, and being beneficial to SMT surface mount is principle.), 10 bottom-side electrodes 21 are two rows and are uniformly distributed along the long limit of antenna; 2, after completing steps 1, on MIRA paper, bronze printing belongs to joint pin 23, in the present embodiment, metal joint pin 23 is provided with two, two metal joint pins 23 are electrically connected to a bottom-side electrodes 21 at two ends respectively, and then curtain coating ferrite membrane, now metal joint pin forms a projection in ferrite membrane, and penetrates ferrite membrane; 3, repeating step 2, formed certain thickness infrabasal plate and metal joint pin 23; 4, on infrabasal plate, print declivity line segment 22, declivity line segment 22 is radially uniformly distributed, and each oblique line section be arranged in parallel; 5, the mode of recycling step 2, makes metal joint pin 23 and the ferrite matrix diaphragm 27 of upper and lower conducting, and the metal joint pin 23 of this step arranges corresponding to each oblique line section 22 two ends; 6, oblique line section 24 in printing, upper oblique line section 24 is radially uniformly distributed, and in the present embodiment, on each, oblique line section 24 be arranged in parallel, and its incline direction is contrary with declivity line segment 22, and on each, oblique line section 24 two ends are connected with metal joint pin 23 respectively; On each oblique line section 24 together with declivity line segment 22, metal joint pin 23 common form take the spiral coil of trunnion axis as coiling axle; 7, curtain coating ferrite slurry, forms upper substrate; 8,, at upper substrate surface print surface electrode 25, in the present embodiment, surface electrode 25 is provided with 10, and (in the present embodiment, upper and lower surface all arranges electrode, in order to make symmetrical configuration, avoids in sintering because structure is asymmetric, produces stress, and causes deformation.), 10 surface electrodes 25 are two rows and are uniformly distributed along the long limit of antenna.Through above laminated step, formed ferrite hair bad, then through smoking, cutting, binder removal, 900 ℃ be around steps such as knots, finally forms ferrite chip antenna.
The antenna forming by above-mentioned technique mainly comprises ferrite matrix matrix 27, ferrite matrix diaphragm 27 tops are provided with the more than one upper oblique line section 24 being obliquely installed, ferrite matrix diaphragm 27 belows are provided with the more than one declivity line segment 22 being obliquely installed, upper oblique line section 24 and declivity line segment 22 interconnect by the metal joint pin 23 being arranged in ferrite matrix diaphragm 27, thereby form one and take the spiral coil of trunnion axis as coiling axle, in the present embodiment, the long axis direction that coil direction is antenna.In the present embodiment, above upper oblique line section 24, be provided with show above diaphragm, below declivity line segment 22, be also provided with lower surface diaphragm, above upper surface diaphragm, be provided with surface electrode 25, below lower surface diaphragm, be provided with bottom-side electrodes 21, in the present embodiment, surface electrode 25 and bottom-side electrodes 21 are respectively equipped with 10,10 electrodes are two rows and arrange, and are uniformly distributed respectively along antenna end long side direction, and the two ends of spiral coil are connected with an electrode by metal joint pin 23 respectively.
Oxysome antenna in the present embodiment comprises ferrite matrix and is embedded in the wire coil in matrix.Matrix is made by high magnetic conductivity ferrite material, plays and strengthens magnetic field, reduces antenna volume, improves the effect of mechanical strength.Printing slurry adopts Ag slurry; By changing coil turn, wire diameter, can easily adjust the electrical parameter of antenna.
Embodiment bis-: please refer to accompanying drawing 6, coil inside in the present embodiment is used and the same ferrite diaphragm 27 of embodiment mono-, and upper and lower base plate makes the ferrite membrane 28 of being made by low magnetic permeability ferrite slurry (u=4) into, low magnetic permeability material has the advantage that insulation property are good, magnetic permeability can be good.
Embodiment tri-: please refer to accompanying drawing 7, the present embodiment coil is inner to be used and the same ferrite diaphragm 27 of embodiment 1, and the ceramic membrane 29 that upper and lower base plate makes into be made by ceramic size.Ceramic and ferritic burning altogether, efficiently solves the shortcoming that ferrite is more crisp.
Embodiment tetra-: please refer to accompanying drawing 8, in the present embodiment, antenna, along the minor face coiling of antenna, forms flat spin coil.Under this kind of mode, the horizontal circle area that single-turn circular coil surrounds is greater than the antenna of embodiment 1.
The antenna that trunnion axis forms as roll coiling is take in the present invention, and this antenna produces the magnetic field that is parallel to draw-in groove, avoids causing decay with draw-in groove quadrature.
Claims (5)
1. a small-sized ferrite chip antenna, it is characterized in that: described antenna comprises ferrite matrix diaphragm, upper oblique line section, declivity line segment and metal joint pin, ferrite matrix diaphragm top is provided with the more than one upper oblique line section being obliquely installed, ferrite matrix diaphragm below is provided with the more than one declivity line segment being obliquely installed, upper oblique line section and declivity line segment interconnect by the metal joint pin being arranged in ferrite matrix diaphragm, thereby form one and take the spiral coil of trunnion axis as coiling axle, above upper oblique line section, be provided with upper surface diaphragm, below declivity line segment, be provided with lower surface diaphragm, above upper surface diaphragm, be provided with surface electrode, below lower surface diaphragm, be provided with bottom-side electrodes, the two ends of spiral coil are connected with an electrode by metal joint pin respectively.
2. small-sized ferrite chip antenna according to claim 1, is characterized in that: described antenna is cuboid, and helical coil is along the long side direction setting of antenna or along the short side direction setting of antenna.
3. small-sized ferrite chip antenna according to claim 1, is characterized in that: described surface electrode and bottom-side electrodes are respectively equipped with 10, and 10 electrodes are two rows and arrange, and are uniformly distributed respectively along antenna end long side direction.
4. according to the small-sized ferrite chip antenna described in claim 1 or 2 or 3, it is characterized in that: described upper oblique line section be arranged in parallel.
5. according to the small-sized ferrite chip antenna described in claim 1 or 2 or 3, it is characterized in that: described declivity line segment be arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310741829.2A CN103682641A (en) | 2013-12-30 | 2013-12-30 | Small-sized ferrite chip antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310741829.2A CN103682641A (en) | 2013-12-30 | 2013-12-30 | Small-sized ferrite chip antenna |
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| Publication Number | Publication Date |
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| CN103682641A true CN103682641A (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310741829.2A Pending CN103682641A (en) | 2013-12-30 | 2013-12-30 | Small-sized ferrite chip antenna |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6268796B1 (en) * | 1997-12-12 | 2001-07-31 | Alfred Gnadinger | Radio frequency identification transponder having integrated antenna |
| CN201038309Y (en) * | 2007-04-04 | 2008-03-19 | 浙江正原电气股份有限公司 | LTCC stacked ceramic antenna |
| CN101657938A (en) * | 2007-04-13 | 2010-02-24 | 株式会社村田制作所 | Magnetic field coupling type antenna, magnetic field coupling type antenna module and magnetic field coupling type antenna device, and these manufacture method |
| CN103094667A (en) * | 2005-07-07 | 2013-05-08 | 户田工业株式会社 | Magnetic antenna |
-
2013
- 2013-12-30 CN CN201310741829.2A patent/CN103682641A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6268796B1 (en) * | 1997-12-12 | 2001-07-31 | Alfred Gnadinger | Radio frequency identification transponder having integrated antenna |
| CN103094667A (en) * | 2005-07-07 | 2013-05-08 | 户田工业株式会社 | Magnetic antenna |
| CN201038309Y (en) * | 2007-04-04 | 2008-03-19 | 浙江正原电气股份有限公司 | LTCC stacked ceramic antenna |
| CN101657938A (en) * | 2007-04-13 | 2010-02-24 | 株式会社村田制作所 | Magnetic field coupling type antenna, magnetic field coupling type antenna module and magnetic field coupling type antenna device, and these manufacture method |
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Application publication date: 20140326 |