CN102891355B - A kind of antenna and there is the mimo antenna of this antenna - Google Patents
A kind of antenna and there is the mimo antenna of this antenna Download PDFInfo
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- CN102891355B CN102891355B CN201110145181.3A CN201110145181A CN102891355B CN 102891355 B CN102891355 B CN 102891355B CN 201110145181 A CN201110145181 A CN 201110145181A CN 102891355 B CN102891355 B CN 102891355B
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Abstract
The open a kind of antenna of the present invention, it includes first medium substrate close to each other and second medium substrate, a sheet metal and the feeder line of this sheet metal of feed-in is all included on surface, two opposite sides on first medium substrate, second medium substrate has the 3rd sheet metal away from first medium substrate side surface configuration, on two metal sheets on first medium substrate, hollow out has micro groove structure, and inventive antenna is also preset with the space that electronic component embeds simultaneously.Antenna according to the present invention, the sheet metal on first medium substrate two surface and the 3rd sheet metal of second medium substrate all can reach to make antenna when relatively low working frequency range works, remain to meet antenna miniaturization, the requiring of function admirable, inventive antenna can embed different electronic components simultaneously, antenna electric magnetic parameter can easily be regulated so that antenna applicable surface is wider.Additionally the present invention also provides for a kind of mimo antenna with multiple above-mentioned antenna, and this mimo antenna has high-isolation.
Description
Technical field
The invention belongs to the communications field, in particular it relates to a kind of antenna and there is the mimo antenna of this antenna.
Background technology
Along with the high development of semiconductor technology, current electronic system integrated level being proposed the highest requirement, the miniaturization of device becomes the technical problem that whole industry is paid special attention to.But, it is different from IC chip and follows the development of " Moore's Law ", as the other important composition radio-frequency module of electronic system, be but faced with the highly difficult technological challenge of device miniaturization.Radio-frequency module mainly includes the main devices such as mixing, power amplifier, filtering, radio signal transmission, matching network and antenna.Wherein, antenna is as the radiating element of final radiofrequency signal and receiving device, and its operating characteristic will directly affect the service behaviour of whole electronic system.But the important indicators such as the size of antenna, bandwidth, gain, radiation efficiency but receive the restriction (gain margin under fixed dimension, bandwidth limit etc.) of basic physical principle.The ultimate principle of these index limit makes the miniaturization technology difficulty of antenna considerably beyond other device, and the complexity of the electromagnetic field analysis due to radio-frequency devices, approaching these ultimate values all becomes huge technological challenge.
Meanwhile, along with the complication of contemporary electronic systems, the demand of multimodal service becomes more and more important in the systems such as radio communication, wireless access, satellite communication, radio data network.And the demand of multimodal service further increases the complexity of miniature antenna multimodes design.Removing the technological challenge of miniaturization, the multimode impedance matching of antenna also becomes the bottleneck of antenna technology.On the other hand, multi-input multi-output system (MIMO) require that the miniaturization of antenna size the most harshly at the high speed development of radio communication, wireless data service field and ensures good isolation, radiance and capacity of resisting disturbance simultaneously.But, traditional terminal communication antenna is based primarily upon the radiation theory of electric monopole or dipole and is designed, the most the most frequently used planar inverted-F antenna (PIFA).The Radiation work frequency of traditional antenna is directly and the size positive correlation of antenna, the area positive correlation of bandwidth and antenna so that the design of antenna typically requires the physical length of half-wavelength.In the electronic system that some are increasingly complex, antenna needs multimode operation, it is necessary to the impedance matching network design outside feed antenna forehead.But the feeder line design of electronic system that what impedance matching network was extra add, the area matching network simultaneously increasing radio system also introduce many energy losses, are difficult to meet the requirement of system design of low-power consumption.Therefore, miniaturization, multimodal new antenna technology become an important technology bottleneck of contemporary electronic integrated system.
Meanwhile, there is bigger diversity in antenna works in different products environment and electromagnetic property, it will causes antenna performance to there is bigger difference in design and use, it requires that the antenna designed must have stronger adaptability and versatility.In sum, original technology in use will will run into versatility and the problem of the poor performance opposite sex.
Summary of the invention
One the invention solves the problems that technical problem is that, bigger diversity is there is for antenna working environment and electromagnetic property in different product, antenna performance is caused to there is bigger difference in design and use, it is provided that a kind of antenna, this antenna has stronger adaptability and versatility.
The present invention solves above-mentioned technical problem and be the technical scheme is that a kind of antenna, and described antenna includes first medium substrate and the second medium substrate with two relative side；Described first medium substrate first side is provided with the first sheet metal and the first feeder line arranged around described first sheet metal, described first medium substrate second side is provided with the second sheet metal and the second feeder line arranged around described second sheet metal, and described first feeder line and the second feeder line are all by the first sheet metal described in coupled modes each feed-in and described second sheet metal；Described second medium substrate one side surface overlaps with described first medium substrate second side, and relative opposite side surface configuration has the 3rd sheet metal；Described first feeder line and the electrical connection of the second feeder line, described second feeder line electrically connects with described 3rd sheet metal；On described first sheet metal, hollow out has the first micro groove structure to form the first metal routing on described first sheet metal, and on described second sheet metal, hollow out has the second micro groove structure to form the second metal routing on described second sheet metal；Described antenna is preset with the space that electronic component embeds.
Further, described space be arranged between the first feeder line, the first feeder line and the first sheet metal and the first sheet metal these three position at least one on.
Further, described space be arranged between the second feeder line, the second feeder line and the second sheet metal and the second sheet metal these three position at least one on.
Further, described space is arranged on the first metal routing on the first sheet metal, or described space is arranged on the first micro groove structure.
Further, described space is arranged on the second metal routing on the second sheet metal, or described space is arranged on the second micro groove structure.
Further, described electronic component is perception electronic component, capacitive electrical element or resistance.
Further, described space is the pad being formed on described antenna.
Further, the scope of described perception electronic component inductance value is between 0-5uH.
Further, the scope of described capacitive electrical component capacitance value is between 0-2pF.
Implement the antenna of the present invention, relative to existing antenna, have the advantages that by arranging the space that electronic component embeds on antenna, by the performance of the electronic component that change embeds, the performance of antenna can be finely adjusted, design the antenna of the requirement meeting adaptability and versatility.It addition, medium substrate two sides is provided with sheet metal, taking full advantage of the spatial area of antenna, antenna can work under relatively low operating frequency in such circumstances, meets antenna miniaturization, low operating frequency, the requirement of broadband multimode.
Another problem to be solved by this invention is to provide a kind of mimo antenna.
The present invention solves the scheme that above-mentioned technical problem used: a kind of mimo antenna, described mimo antenna includes multiple above-mentioned antenna.
According to the mimo antenna of the present invention, in addition to possessing the feature of antenna itself, also having the highest isolation, the capacity of resisting disturbance between multiple antennas is strong.
Accompanying drawing explanation
Fig. 1 is inventive antenna first medium substrate A face viewing angle constructions schematic diagram；
Fig. 2 is inventive antenna first medium substrate B face viewing angle constructions schematic diagram；
Fig. 3 is inventive antenna second medium board structure schematic diagram；
Fig. 4 is the front view of the antenna first embodiment of the present invention；
Fig. 5 is the front view of antenna second embodiment of the present invention；
Fig. 6 is the front view of antenna the 3rd embodiment of the present invention；
Fig. 7 is the front view of antenna the 4th embodiment of the present invention；
Fig. 8 is the front view of antenna the 5th embodiment of the present invention；
Fig. 9 a is the schematic diagram of complementary opening resonance loop structure；
Fig. 9 b show the schematic diagram of complementary helix structure；
Fig. 9 c show the schematic diagram of opening helical ring structure；
Fig. 9 d show the schematic diagram of dual openings helical ring structure；
Fig. 9 e show the schematic diagram of complementary folding line structure；
Figure 10 a is that its geometry of complementary opening resonance loop structure shown in Fig. 9 a derives schematic diagram；
Figure 10 b is the derivative schematic diagram of its extension of the complementary opening resonance loop structure shown in Fig. 9 a；
Figure 11 a be the complementary opening resonance loop structure shown in three Fig. 9 a compound after structural representation；
Figure 11 b is the compound schematic diagram that the complementary opening resonance loop structure shown in two Fig. 9 a and Fig. 7 show complementary helix structure；
Figure 12 is the structural representation after the complementary opening resonance loop structure group battle array shown in four Fig. 9 a.
Detailed description of the invention
As shown in Figure 1, Figure 2, Figure 3 shows, the described antenna of the present invention includes first medium substrate 1, second medium substrate 2.First medium substrate 1 includes two relative A face and B faces, and A face is provided with the first sheet metal 10, and the first sheet metal 10 is provided with the first feeder line 11.B face is provided with the second sheet metal 20, and the second sheet metal 20 is provided with the second feeder line 21.First feeder line 11 and the second feeder line 21 are all each via coupled modes feed-in the first sheet metal 10 and the second sheet metal 20.On first sheet metal 10, hollow out has the first micro groove structure 100 to form the first metal routing 101 on the first sheet metal 10, and on the second sheet metal 20, hollow out has the second micro groove structure 200 to form the second metal routing 201 on the second sheet metal 20.Second medium substrate 2 one side overlaps with first medium substrate B face, and the another side in this face relatively is provided with the 3rd sheet metal 30.First feeder line 11 electrically connects with the second feeder line 21, and the second feeder line 21 electrically connects with the 3rd sheet metal 30.The space 6 that electronic component embeds also it is preset with on described antenna.
Each feeder line and its around sheet metal between coupled modes can be that inductive coupled mode can also be for capacitive coupling mode.When feeder line and its around sheet metal between exist can short circuit point time, the two is inductive coupled mode, when feeder line and its around sheet metal between do not contact with each other time, then the two relative part constitutes coupling electric capacity and makes the two form capacitive coupling.Different coupled modes are more weak to the impact effect of the present invention, therefore repeat no more.
The present invention the first micro groove structure 100 and the second micro groove structure 200 may each be the micro groove structure that a kind of or derivative by the most several structures, the compound or group battle array in the complementary folding line structure shown in the dual openings helical ring structure shown in the opening helical ring structure shown in the complementary helix structure shown in the complementary opening resonance loop structure shown in Fig. 9 a, Fig. 9 b, Fig. 9 c, Fig. 9 d, Fig. 9 e obtains.Derive and be divided into two kinds, one is that geometry derives, another kind is that extension is derivative, and geometry herein is derivative refers to that function is similar, variform structure is derivative, such as, derived to class of a curve structure, triangle class formation and other different polygon class formation by square frame class formation；Extension herein derives i.e. offers new groove to form new micro groove structure on the basis of Fig. 9 a to Fig. 9 e；As a example by the complementary opening resonance loop structure shown in Fig. 9 a, Figure 10 a is that its geometry derives schematic diagram, and Figure 10 b is that its geometry derives schematic diagram.Herein compound refers to, the multiple superposition of micro groove structure of Fig. 9 a to Fig. 9 e forms a new micro groove structure, as shown in fig. 11a, be the complementary opening resonance loop structure shown in three Fig. 9 a compound after structural representation；As shown in figure 11b, it is that the complementary opening resonance loop structure shown in two Fig. 9 a show the structural representation after complementary helix structure is combined jointly with Fig. 9 b.Group battle array herein refers to be formed an overall micro groove structure in same metal on-chip array, as shown in figure 12, for the structural representation after multiple complementary opening resonance loop structure group battle arrays as illustrated in fig. 9 by the micro groove structure shown in multiple Fig. 9 a to Fig. 9 e.First micro groove structure 100 and the second micro groove structure 200 all illustrate the present invention as a example by the opening helical ring structure shown in Fig. 9 c below, but should know that the structure of the two can be different.
First sheet metal 10 and the second sheet metal 20 are engraved formed the mode of the first micro groove structure 100 and the second micro groove structure 200 can be etching, bore quarter, photoetching, electronics quarter, the technique such as ion quarter, wherein it is etched to selection process, it has main steps that after designing suitable micro groove structure, then by etching machines, the foil parts utilizing the chemical reaction of solvent and metal to get rid of default micro groove structure i.e. can obtain being formed with the sheet metal of above-mentioned micro groove structure.The material of above-mentioned tinsel can be the metal such as copper, silver.
When Antenna Operation is in low-frequency range, the wavelength that the electromagnetic wave of low-frequency range is corresponding is longer, according to antenna design principles, the electric radiation length of feeder will increase so that feeder line physical length is elongated, and longer feeder line also makes feeder loss increase that antenna overall performance is declined not only bad for the miniaturization that antenna is overall simultaneously.
The present invention increases the effective radiating area of feeder line in terms of two on the premise of not changing feeder line physical length.First aspect is the first sheet metal 10 and the second sheet metal 20 by being arranged on first medium substrate 1, is increased the swept area of feeder line by two sheet metals coupled relation each other.First sheet metal 10 of 1 liang of apparent surface of first medium substrate can be connected with the second sheet metal 20, it is also possible to is not connected to.In the case of the first sheet metal 10 and the second sheet metal 20 are unconnected, fed by capacitively coupled mode between the first sheet metal 10 and the second sheet metal 20；In such cases, the first sheet metal 10 and resonance of the second sheet metal 20 can be realized by the thickness of change medium substrate.In the first sheet metal 10 and (being such as connected by the form of wire or plated-through hole) in the case of the second sheet metal 20 electrical connection, feed by the way of inductive coupled between the first sheet metal 10 and the second sheet metal 20.Meanwhile, the first feeder line 11 is electrically connected by the plated-through hole 12 being formed on first medium substrate with the second feeder line 21.
Second aspect, the 3rd sheet metal 30 being arranged at second medium substrate 2 couples with the second feeder line 21 being arranged at first medium substrate B face, and to the second micro groove structure 200 couple feed formed on the second sheet metal 20.Being formed with plated-through hole 23 on second medium substrate 2, plated-through hole 23 also can mutually can stagger on a vertical with the plated-through hole on first medium substrate.Plated-through hole 23 electrically connects the second feeder line 21 and the 3rd sheet metal 30.The area of the 3rd sheet metal 30 couple feed can easily be accommodated, and only needs simply to adjust the couple feed area of the 3rd sheet metal 30 for that working frequency range different.
The present invention can be by being embedded in different electronic components to adjust the electromagnetic parameter of antenna and to mate different response frequency range at sky space of lines 6 simultaneously.The position of it space of lines 6 can be multiple, and electronic component is the most multiple, the embedded location in different spaces 6 and the corresponding different antenna electric magnetic parameter of different electronic components.Describe in detail below by five embodiments.Owing to, in the present invention, the AB two sides structure of first medium substrate is identical, the most only describes the structure on first medium substrate one surface.
First better embodiment
As shown in Figure 4, in this better embodiment, being preset with embedding perception electronic component and/or the space 51 of resistance on the first feeder line 11, the position embedding electronic component space preset can be the optional position on the first feeder line 11, and can have multiple.Perception electronic component can be embedded, to change the inductance value on the first feeder line 11 in space 51.Using formula:Understand square being inversely proportional to, so when the operating frequency needed is relatively low operating frequency, realizing of the size of inductance value and operating frequency by being appropriately embed inductance or perception electronic component.In this better embodiment, the inductance value range of the perceptual electronic component of addition is between 0-5uH, if the biggest alternating signal will be consumed by inductive element thus have influence on the radiation efficiency of antenna.The described antenna of this better embodiment has the good radiation characteristic of multiple frequency range, five main radiation frequencies are distributed to 5.5GHz from 900MHz always, almost cover GSM, CDMA, bluetooth, W-Lan (IEEE802.11 agreement), each main communication frequency such as GPS, TD-LTE, there is the highest integrated level and can be by the inductance value on the first feeder line and the second feeder line is adjusted reaching changing the purpose of operating frequency of antenna.It is of course also possible in space 51 embedded resistor, to improve the radiation resistance of antenna.Certainly, the space on the first feeder line can also be multiple, is wherein respectively embedded into resistance and perception electronic component, had both achieved the regulation of operating frequency, and can improve again the radiation resistance of antenna.
Second better embodiment
As shown in Figure 5, in this better embodiment, between the first feeder line 11 and the first sheet metal 10, between be preset with embed capacitive electrical element space 54, preset embed electronic component space position can be the optional position between the first feeder line 11 and the first sheet metal 10.In Fig. 4, space 54 is the space embedding capacitive electrical element in this better embodiment, between first feeder line 11 and the first sheet metal 10, itself there is certain electric capacity, couple here by the signal embedded between capacitive electrical element regulation the first feeder line 11 and the first sheet metal 10, using formula:Understand square being inversely proportional to, so when the operating frequency needed is relatively low operating frequency, realizing of the size of capacitance and operating frequency by being appropriately embed electric capacity or perception electronic component.In this better embodiment, the capacitance value range of the capacitive electrical element of addition generally between 0-2pF, but along with operating frequency of antenna change embed capacitance be likely to the scope beyond 0-2pF.It is of course also possible to preset multiple spaces between the first feeder line 11 and the first sheet metal 10.Equally, in the space being not connected with electronic component, use wire short circuit.
3rd better embodiment
As shown in Figure 6, in this better embodiment, being reserved with embedding perception electronic component and/or the space of resistance on the first metal routing 101 of the first sheet metal, the space of embedding electronic component is not limited solely to space 55 and the space 56 provided in figure, as long as other positions meet condition.Embed the purpose of perception electronic component herein and be to increase the inductance value of the first sheet metal internal resonant structure, thus the resonant frequency of antenna and bandwidth of operation are played the effect of regulation；Identical with better embodiment one, the purpose of embedded resistor is to improve the radiation resistance of antenna herein.To then embedding perception electronic component or resistance, the most as required depending on.Additionally in the space being not embedded into electronic component, use wire short circuit.
4th better embodiment
As it is shown in fig. 7, in this better embodiment, the first micro groove structure 100 is reserved with the space embedding capacitive electrical element, and the first metal routing 101 of connection both sides, described space.The space embedding electronic component is not only limited to and the space 57 that is given in Fig. 5, as long as other positions meet condition.Embed capacitive electrical element and can change the resonance performance of the first sheet metal, finally improve Q-value and the resonant operational point of antenna.As common knowledge, it is known that the relation of passband BW and resonant frequency w0 and quality factor q is: BW=wo/Q, this formula shows, Q is the biggest, and then passband is the narrowest, and the least then passband of Q is the widest.Separately having: Q=wL/R=1/wRC, wherein, Q is quality factor；Supply frequency when w is circuit resonance；L is inductance；R is the resistance of string；C is electric capacity, and from Q=wL/R=1/wRC formula, Q and C is inverse ratio, therefore, it can reduce Q-value by addition capacitive electrical element, makes passband broaden.
5th better embodiment
As shown in Figure 8, in this better embodiment, between first feeder line the 11, first feeder line 11 and the first sheet metal 10, between and these five positions of the first sheet metal 10 on all arrange electronic component embed space.Wherein, the space on the first sheet metal 10 includes the space being arranged on the first metal routing 101 and is arranged on the first micro groove structure 100 and connects the space of the first metal routing 101 of both sides.Specifically, space in this better embodiment includes the space 62 on the first feeder line 11, space 64 between first feeder line 11 and the first sheet metal 10, space 65,66 on first metal routing 101, space 67 on first micro groove structure 100, certainly, the position be given in this better embodiment is not uniqueness, in this better embodiment, electronic component is added to regulate the performance of antenna in above-mentioned space, its principle is similar with the principle of better embodiment one to four, and this better embodiment no longer describes.
On the antenna of the present invention, the reserved location in space is not limited to above-mentioned five kinds of forms, as long as space is arranged on antenna.Such as, space can also be arranged on medium substrate.
The described electronic component of the present invention is perception electronic component, capacitive electrical element or resistance.After adding this type of electronic component in the headspace of antenna, the various performances of antenna can be improved.And by adding the electronic component of different parameters, it is possible to achieve antenna performance parameters adjustable.Therefore, the antenna of the present invention can be the same structure before being added without any element, add different electronic components, and the parameter (inductance value, resistance value, capacitance) of electronic component simply by diverse location, realize the performance parameter of different antennae.I.e. achieve versatility.Production cost can be greatly reduced.
The described space of the present invention can be pad, it is also possible to be a vacancy.The structure of pad may refer to the pad on common circuit board.Certainly, the design of its size needs meeting different according to different.
It addition, in the present invention, first medium substrate is made up of ceramic material, macromolecular material, ferroelectric material, ferrite material or ferromagnetic material with second medium substrate.Preferably, it is made up of macromolecular material, can be specifically the macromolecular materials such as FR-4, F4B.
Present invention also offers a kind of mimo antenna, described mimo antenna is made up of multiple above-mentioned antennas.MIMO herein i.e. refers to multiple-input and multiple-output.I.e. all single antenna in mimo antenna is launched simultaneously, receives simultaneously.Mimo antenna can increase considerably information throughput and the transmission range of system on the premise of need not increase bandwidth or total transmit power loss.Additionally the mimo antenna of the present invention also has the highest isolation, and the capacity of resisting disturbance between multiple antennas is strong.
Accessing one reception/transmitter after the mimo antenna of the present invention, the first feeder line of each of which antenna and the electrical connection of the second feeder line, all of reception/transmitter is all connected on a baseband signal processor.
Above in conjunction with accompanying drawing, the better embodiment of the present invention is described; but the invention is not limited in above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematically; rather than it is restrictive; those of ordinary skill in the art is under the enlightenment of the present invention; in the case of without departing from present inventive concept and scope of the claimed protection, it may also be made that a lot of form, within these belong to the protection of the present invention.
Claims (4)
1. an antenna, it is characterised in that described antenna includes first medium substrate and the second medium substrate with two relative side；Described first medium substrate first side is provided with the first sheet metal and the first feeder line arranged around described first sheet metal, second side relative with described first side is provided with the second sheet metal and the second feeder line arranged around described second sheet metal, and described first feeder line and described second feeder line are all by the first sheet metal described in coupled modes each feed-in and described second sheet metal；Described second medium substrate one side surface overlaps with described first medium substrate second side, and relative opposite side surface configuration has the 3rd sheet metal；Described first feeder line and the electrical connection of the second feeder line, described second feeder line electrically connects with described 3rd sheet metal；On described first sheet metal, hollow out has the first micro groove structure to form the first metal routing on described first sheet metal, and on described second sheet metal, hollow out has the second micro groove structure to form the second metal routing on described second sheet metal；Described antenna be preset with electronic component embed space, wherein,
Described space be arranged between the first feeder line, the first feeder line and the first sheet metal and the first sheet metal these three position at least one on, and described electronic component is perception electronic component, capacitive electrical element or resistance, described space is the pad being formed on described antenna, and described perception electronic component inductance value scope between 0-5uH, the scope of described capacitive electrical component capacitance value is between 0-2pF；
Or, described space be arranged between the second feeder line, the second feeder line and the second sheet metal and the second sheet metal these three position at least one on, and described electronic component is perception electronic component, capacitive electrical element or resistance, described space is the pad being formed on described antenna, and described perception electronic component inductance value scope between 0-5uH, the scope of described capacitive electrical component capacitance value is between 0-2pF.
Antenna the most according to claim 1, it is characterised in that described space is arranged on the first metal routing on the first sheet metal, or described space is arranged on the first micro groove structure.
Antenna the most according to claim 1, it is characterised in that described space is arranged on the second metal routing on the second sheet metal, or described space is arranged on the second micro groove structure.
4. a mimo antenna, it is characterised in that described mimo antenna includes multiple antenna as claimed in claim 1.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110145181.3A CN102891355B (en) | 2011-05-31 | 2011-05-31 | A kind of antenna and there is the mimo antenna of this antenna |
| PCT/CN2011/080437 WO2012122794A1 (en) | 2011-03-14 | 2011-09-30 | Antenna and mimo antenna having the antenna |
| TW100150007A TWI515959B (en) | 2011-03-14 | 2011-12-30 | Antenna and mimo antenna with the antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110145181.3A CN102891355B (en) | 2011-05-31 | 2011-05-31 | A kind of antenna and there is the mimo antenna of this antenna |
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| CN102891355A CN102891355A (en) | 2013-01-23 |
| CN102891355B true CN102891355B (en) | 2016-08-03 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101111972A (en) * | 2005-01-27 | 2008-01-23 | 株式会社村田制作所 | Antenna and wireless communication device |
| CN101740862A (en) * | 2008-11-20 | 2010-06-16 | 东莞市启汉电子科技有限公司 | Dipole antenna of RF chip |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101111972A (en) * | 2005-01-27 | 2008-01-23 | 株式会社村田制作所 | Antenna and wireless communication device |
| CN101740862A (en) * | 2008-11-20 | 2010-06-16 | 东莞市启汉电子科技有限公司 | Dipole antenna of RF chip |
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