CN102067377A - An antenna device and an electronic product of using it - Google Patents
An antenna device and an electronic product of using it Download PDFInfo
- Publication number
- CN102067377A CN102067377A CN2008801299916A CN200880129991A CN102067377A CN 102067377 A CN102067377 A CN 102067377A CN 2008801299916 A CN2008801299916 A CN 2008801299916A CN 200880129991 A CN200880129991 A CN 200880129991A CN 102067377 A CN102067377 A CN 102067377A
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- Prior art keywords
- conductor
- antenna assembly
- antenna
- circuit substrate
- layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
Abstract
An antenna device is provided. The antenna device includes a circuit substrate, and the first conductor which is covered on the first layer of the circuit substrate; the antenna device also includes the second conductor which is covered on at least another layer of the circuit substrate; an inductance is formed between the first conductor and the second conductor; and /or the antenna device includes a parasitic capacitor which is formed between the first conductor and the ground. The antenna can be greatly miniaturized, and can be widely used in all kinds of electronic products.
Description
A kind of antenna assembly and use its technical field of electronic products
The present invention relates to the antenna of antenna, more particularly to FM frequency ranges.Background technology
FM frequency ranges（The 08MHz of 76MHz ~ 1) design difficulty of antenna is the problem of be to minimize.According to the resonance length calculation formula of monopole antenna（Formula 1) understand, just energy just with more satisfactory eradiation or can be received with resonance when antenna length is at least equal to a quarter operation wavelength.Therefore we deduce that exemplified by radiating 1 00MHz signals, its antenna length should be 75 cm or so.And this length is impossible in current popular electronic multimedia terminal. ( 1 )
Wherein, L is the resonance length of antenna, and λ is the wavelength of working electromagnet ripple.
A kind of FM reception antennas of prior art are arranged in the earphone cord being connected with communication equipment.This structure with relatively long wire causes antenna length enough for low frequency applications.However, launching for most FM longer exterior antenna is all not allow under the occasion that occasion and part FM are received.
Therefore how FM antennas, which minimize, just turns into an important problem.In other words, in the case of the length or area of given very little, how its resonant frequency to be reduced be research of technique difficult point.The content of the invention
The purpose of the present invention is that there is provided the transmitting of miniaturization and reception antenna by reducing the resonant frequency of antenna.
Therefore, the present invention provides a kind of antenna assembly in first aspect.The antenna assembly includes circuit substrate and the first conductor being coated on circuit substrate first layer, it is characterised in that the antenna assembly also includes the second conductor being coated at least another layer of circuit substrate, and mutual inductance is formed between the first conductor and the second conductor.
According to second aspect, the present invention provides a kind of antenna assembly.It includes circuit substrate and the first conductor being coated on circuit substrate first layer, it is characterised in that the antenna assembly is additionally included in the parasitic capacitance formed between the first conductor and ground.
Preferably, in second aspect, describedly on another layer of circuit substrate, there is overlapping area between first conductor and adjacent ground.According to another alternative solution, the ground can form the parasitic capacitance with the first conductor between same layer or different layers, and the adjacent part of ground and the first conductor.
The antenna of the present invention can be minimized significantly.Performance is stable, cheap.In other words, in the case of the length or area of given very little, its resonant frequency can be greatly reduced.The antenna can be widely applied in various electronic products.Brief description of the drawings
Specific embodiments of the present invention are described in detail below with reference to accompanying drawings, in accompanying drawing：
Fig. 1 is doubling plate level antenna schematic diagram according to the first embodiment of the invention；Fig. 2 is the partial enlarged drawing of Fig. 1 plate level antenna；
Fig. 3 is the equivalent circuit diagram of three layers of antenna with mutual inductance；
Fig. 4 is to introduce the schematic diagram of electric capacity according to the facing area s of increase by two pole plates of electric capacity of the second embodiment；
Fig. 5 is just adjusting the distance d and introduce the schematic diagram of electric capacity according to reduction two pole plates of electric capacity of the 3rd embodiment；
Fig. 6 illustrates two kinds of patterns that antenna forms parasitic capacitance with ground；
Fig. 7 illustrates the equivalent circuit diagram of three layers of antenna with parasitic capacitance；
Fig. 8 illustrates the circuit layout using inventive antenna device；
Fig. 9 is the schematic diagram of the plate level antenna according to the 4th embodiment.Embodiment
Fig. 1 is doubling plate level antenna schematic diagram according to the first embodiment of the invention.
As shown in figure 1, in the tow sides coiling spiral plate level antenna of double layer printed circuit plate.Realized and connected with via between this two layers helical antenna, and in terms of a direction（For example depression angle）, the direction of two layers of helical antenna coiling is identical.Fig. 2 is the partial enlarged drawing of Fig. 1 plate level antenna, wherein dark pattern part is antenna top layer, light-colored part is antenna bottom.
Therefore, mutual inductance effect will be formed between this two layers of helical antenna, and will greatly increase inductance value, reduce the resonant frequency of antenna.
It is worth noting that, the distance between the effect of mutual inductance and helical antenna, i.e. interlamellar spacing are into anti-
Than.Interlamellar spacing is smaller, and plank is thinner, and helical antenna distance is nearer, and mutual induction amount is bigger.
Furthermore, it is possible to select the pattern of every helical layer antenna, the inductive enhancing formed it into reduces resonance point with this.The pattern of antenna can be diversified , Round shapes, rectangle or irregular shape, and emphasis is to form spiral effect to make it in perception to reduce resonant frequency.
It is to be appreciated that every layer of antenna can be non-helical other patterns, the pattern of different layers antenna can also be differed, as long as they can have inductance characteristic to form mutual inductance effect among each other.
It is of course also possible on multi-layer PCB board coiling helical antenna, further to increase mutual induction amount.Fig. 3 is the equivalent circuit diagram of three layers of antenna with mutual inductance.
As shown in figure 3, P 0 is the power feed inputs of antenna, r is the input resistance of antenna, and L1 is the equivalent inductance of top layer antenna, and L2 is the equivalent inductance of intermediate layer antenna, and K1 is the mutual inductance of top layer inductance and intermediate layer inductance.Top layer and the distance between intermediate layer are nearer, and mutual induction amount is bigger, and K 1 is bigger, and equivalent summation inductance value is bigger.Similarly, L 3 is the equivalent inductance of bottom antenna, and K2 is the mutual inductance of intermediate layer inductance and bottom inductance.Certainly, there is also mutual inductance effect with bottom inductance for top layer inductance, it is illustrated that such as K 3.It is load resistance.Although the introducing of inductance can reduce resonant frequency in antenna, inductance also increases the energy storage effect of antenna simultaneously, and is unfavorable for radiation.Accordingly, it would be desirable to introduce electric capacity to offset the energy storage effect that inductance is brought.
At the same time, according to equation（2) understand, with the increase for introducing electric capacity so that resonant frequency is further reduced.
Wherein, f is the resonant frequency of antenna, and L is the inductance value of antenna, and C is the capacitance of antenna.
Introducing the method for electric capacity has two.According to electric capacity calculation formula（3) understand, the purpose for introducing electric capacity can be reached by increasing the facing area s of two pole plates of electric capacity and reducing just adjusting the distance for two pole plates of electric capacity.Here the two poles of the earth of electric capacity are antenna respectively（An t enna) and ground（gnd ) .
C = k - - d ( 3 )
Wherein, C is capacitance, and k is constant coefficient, and s is the facing area of two pole plates of electric capacity, and d is just adjusting the distance for two pole plates of electric capacity.
Fig. 4 is to introduce the schematic diagram of electric capacity according to the facing area s of increase by two pole plates of electric capacity of the second embodiment.The figure is by taking two-ply as an example.In figure, dark antenna pattern is antenna top layer, and light-colored part is antenna bottom.Top layer antenna side is ground；Bottom antenna extends certain area to same side, and with the ground of top layer（Black box）Form overlapping, produce parasitic capacitance.
Certainly, the big I of electric capacity is adjusted by the area s of overlapping region.
Fig. 5 is just adjusting the distance d and introduce the schematic diagram of electric capacity according to reduction two pole plates of electric capacity of the 3rd embodiment.As shown in figure 5, antenna and ground are closer to the distance in one layer of doubling plate level antenna.When reducing the distance between antenna and ground to a certain extent, parasitic capacitance can be produced between antenna and ground.Using such parasitic capacitance, inductance can be offset and the resonant frequency of antenna is reduced.
Furthermore, it is possible to form parasitic capacitance with antenna simultaneously with the ground of tow sides, increase electric capacity to reduce resonant frequency.
Certainly, the form that antenna forms electric capacity with ground can be with varied.Fig. 6 illustrates two kinds of patterns that antenna forms parasitic capacitance with ground.It should be noted that this only belongs to example.
It should be noted that can also on the different layers of multi-layer PCB board or between formed Fig. 4 and 5 shown in parasitic capacitance, further to increase parasitic capacitance.
Fig. 7 illustrates the equivalent circuit diagram of three layers of antenna with parasitic capacitance.The parasitic capacitance formed between top layer antenna and ground is CP 1, and the parasitic capacitance formed between intermediate layer antenna and ground is CP2, and the parasitic capacitance formed between bottom antenna and ground is CP 3.Remaining circuit is identical with Fig. 3.The those of ordinary skill of field of antenna knows that, when Electromagnetic Wave Propagation is in certain medium, the wavelength that wavelength can in atmosphere be propagated than it is short.
Λ=k are several0 sr~ ( 4 )
Wherein, λ is the wavelength of working electromagnet ripple in medium, and k is constant coefficient, λ.It is the wavelength of working electromagnet ripple in air, εrIt is the relative dielectric constant of medium.
According to equation（4) understand, the relative dielectric constant ε of the mediumrBigger, then wavelength is shorter.Further according to equation（1) understand, wavelength is shorter, and the antenna length needed for it is shorter, is more conducive to antenna miniaturization.Therefore, antenna miniaturization is advantageously implemented using the pcb board material of high-k.
Fig. 8 illustrates the circuit layout using inventive antenna device.As illustrated, the antenna assembly of the present invention can be compactly located in the side of circuit board, the configuration of circuit board opposite side is corresponding
Circuit, is therebetween kept apart them using the ground compared with small area.
Fig. 9 is the schematic diagram of the antenna assembly according to the 4th embodiment.It is different from Fig. 4 place, dark antenna pattern is antenna top layer in detail in this figure, and light-colored part is stratum, and forms overlapping between top layer antenna and the ground of bottom, produces parasitic capacitance.In other words, be not as Fig. 4 antenna part to position extend, but bottom is extended to below antenna, with antenna part formation excessive effects to produce parasitic capacitance.
Although having carried out expansion explanation to the present invention above in association with F M antennas, the invention is not restricted to this, other type antennas are applied also for, to realize miniaturization.
It should be noted that both can be actual ground or a relative reference potential previously describedly.
In addition, the antenna of the present invention be applicable not only to including in the portable radio communication device including mobile phone, can be applicable to it is other can be portable but be primarily intended to the static equipment used, such as small clock and watch or game console.
It is clear that invention described herein can have many changes, this change must not believe that deviation the spirit and scope of the present invention.Therefore, all changes that will be apparent to those skilled in the art, are included within the covering scope of the claims.
Claims (1)
- ClaimsA kind of antenna assemblies of I, including circuit substrate and the first conductor being coated on circuit substrate first layer, it is characterized in that the antenna assembly also includes the second conductor being coated at least another layer of circuit substrate, mutual inductance is formed between the first conductor and the second conductor.5 2. antenna assemblies as claimed in claim 1, it is characterised in that regulation the distance between the first layer and at least another layer, to adjust the resonant frequency of antenna assembly.3. antenna assembly as claimed in claim 1, it is characterised in that the pattern of regulation first conductor and the second conductor, to adjust the resonant frequency of antenna assembly.4. antenna assembly as claimed in claim 1, it is characterised in that at least another layer is two 10 layers or more, multiple mutual inductances are being formed including circuit substrate first layer between at least another layer of each layer.5. antenna assembly as claimed in claim 1, it is characterised in that the circuit substrate is made of the sheet material of high-k.6. antenna assembly as claimed in claim 1, it is characterised in that the antenna assembly also includes 15 parasitic capacitances formed between the first conductor and ground.7. antenna assembly as claimed in claim 6, it is characterised in that describedly on another layer of circuit substrate, has overlapping area between first conductor and adjacent ground.8. antenna assembly as claimed in claim 6, it is characterised in that the parasitic capacitance is formed between same layer or different layers, and the adjacent part of ground and the first conductor with the first conductor describedly.20 9. antenna assemblies as claimed in claim 1, it is characterised in that the antenna assembly is used to launch and/or receive FM signal.10. the antenna assembly as described in claim 1, it is characterised in that the first conductor and the second conductor have essentially identical pattern.I I. antenna assemblies as claimed in claim 1, it is characterised in that first conductor and the 25th 2 conductor are helical form.12. a kind of antenna assembly, including circuit substrate and the first conductor for being coated on circuit substrate first layer, it is characterised in that the antenna assembly is additionally included in the parasitic capacitance formed between the first conductor and ground.13. antenna assembly as claimed in claim 12, it is characterised in that describedly on another layer of circuit substrate 30, has overlapping area between first conductor and adjacent ground.14. antenna assembly as claimed in claim 13, it is characterised in that the ground and/or the first conductor have extension, and realize the overlapping area between first conductor and adjacent ground.100215. antenna assembly as claimed in claim 13, it is characterised in that the circuit substrate is multi-layer sheet, forms the parasitic capacitance between multiple-plate different layers.16. antenna assembly as claimed in claim 13, it is characterised in that adjust resonant frequency by adjusting overlapping area.17. antenna assembly as claimed in claim 12, it is characterised in that form the parasitic capacitance between the adjacent part of the first conductor describedly.18. antenna assembly as claimed in claim 17, it is characterised in that describedly with the first conductor in same layer or different layers.19. antenna assembly as claimed in claim 17, it is characterised in that pattern Shi Round arc or rectangle of the pole plate of the parasitic capacitance in opposite side.20. antenna assembly as claimed in claim 17, it is characterised in that by adjusting describedlyly and the distance between the first conductor adjusts resonant frequency.21. antenna assembly as claimed in claim 17, it is characterised in that the circuit substrate is multi-layer sheet, in multiple-plate other layers or between form the parasitic capacitance.22. antenna assembly as claimed in claim 12, it is characterised in that the circuit substrate is made of the sheet material of high-k.23. antenna assembly as claimed in claim 12, it is characterised in that the antenna assembly also includes the second conductor being coated at least another layer of circuit substrate, and mutual inductance is formed between the first conductor and the second conductor.24. antenna assembly as claimed in claim 12, it is characterised in that the antenna assembly is used to launch and/or receive FM signal.25. a kind of electronic product, including the antenna assembly as described in claim 1 or 12.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2008/001224 WO2009155732A1 (en) | 2008-06-25 | 2008-06-25 | An antenna device and an electronic product of using it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102067377A true CN102067377A (en) | 2011-05-18 |
Family
ID=41443959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008801299916A Pending CN102067377A (en) | 2008-06-25 | 2008-06-25 | An antenna device and an electronic product of using it |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102067377A (en) |
| WO (1) | WO2009155732A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2101329U (en) * | 1991-09-13 | 1992-04-08 | 上海天下电子电器有限公司 | Miniature tv receiving antenna |
| CN1126382A (en) * | 1994-10-04 | 1996-07-10 | 三菱电机株式会社 | Antenna equipment |
| US20040227672A1 (en) * | 2003-05-15 | 2004-11-18 | Kai-Te Chen | Antenna with printed compensating capacitor |
| CN1574460A (en) * | 2003-06-24 | 2005-02-02 | 京瓷株式会社 | Antenna, antenna module and radio communication apparatus provided with the same |
| CN101060200A (en) * | 2007-06-12 | 2007-10-24 | 北京交通大学 | A floor-mounted curve groove type elliptic plane monopolar antenna |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3144744B2 (en) * | 1993-11-02 | 2001-03-12 | 日本碍子株式会社 | Multilayer dielectric filter |
| JP3180684B2 (en) * | 1996-09-24 | 2001-06-25 | 株式会社村田製作所 | antenna |
| JP2002111348A (en) * | 2000-09-26 | 2002-04-12 | Kenwood Corp | Antenna |
| GB0604481D0 (en) * | 2006-03-06 | 2006-04-12 | Innovision Res & Tech Plc | RFID device antenna |
-
2008
- 2008-06-25 CN CN2008801299916A patent/CN102067377A/en active Pending
- 2008-06-25 WO PCT/CN2008/001224 patent/WO2009155732A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2101329U (en) * | 1991-09-13 | 1992-04-08 | 上海天下电子电器有限公司 | Miniature tv receiving antenna |
| CN1126382A (en) * | 1994-10-04 | 1996-07-10 | 三菱电机株式会社 | Antenna equipment |
| US20040227672A1 (en) * | 2003-05-15 | 2004-11-18 | Kai-Te Chen | Antenna with printed compensating capacitor |
| CN1574460A (en) * | 2003-06-24 | 2005-02-02 | 京瓷株式会社 | Antenna, antenna module and radio communication apparatus provided with the same |
| CN101060200A (en) * | 2007-06-12 | 2007-10-24 | 北京交通大学 | A floor-mounted curve groove type elliptic plane monopolar antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009155732A1 (en) | 2009-12-30 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110518 |