CN103367876B - The method for designing of multiband antenna apparatus - Google Patents
The method for designing of multiband antenna apparatus Download PDFInfo
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- CN103367876B CN103367876B CN201210580363.8A CN201210580363A CN103367876B CN 103367876 B CN103367876 B CN 103367876B CN 201210580363 A CN201210580363 A CN 201210580363A CN 103367876 B CN103367876 B CN 103367876B
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Abstract
The present invention provides the method for designing of a kind of multiband antenna apparatus that can design the multiband antenna apparatus with desired characteristic at short notice.In the 1st step, low-frequency band radiating element and the configuration of high frequency band radiating element are determined for earth conductor, and determines to contain the electrical length of each several part of radiating element branch circuit.In second step, respectively provide the 3rd electrical length between the 2nd electrical length and branch point and the supply terminals between the 1st electrical length, branch point and the high frequency band radiating element between branch point and low-frequency band radiating element, to determine the resonant frequency of low-frequency band, the resonant frequency of high frequency band and anti-resonance frequency.In third step, the VSWR improvement impedance conversion element loaded between power supply circuits and supply terminals is specified.
Description
Technical field
The present invention relates to a kind of method that the antenna assembly of multiband is designed, fill particularly to one
It is loaded in the method for designing of the multiband antenna apparatus of the small-sized communication terminal devices such as mobile telephone terminal.
Background technology
In recent years, in the small-sized communication terminal devices such as mobile telephone terminal, for corresponding multiple frequency bands,
Use multiband antenna the most as one, in Patent Document 2.
Patent documentation 1 shows a kind of multiband antenna apparatus, and this multiband antenna apparatus possesses and shares
The radiating element of low-frequency band that is connected of power supply section and the radiating element of high frequency band, these radiation
The open end of element is mutually adjacent.Fig. 7 is the expansion of the multiband antenna apparatus shown in patent documentation 1
Figure.In this example embodiment, possess from the supply terminals 1 power supply section to branch point, by circuit 3,4,5
The low-frequency band radiating element constituted and the high frequency band radiating element being made up of circuit 6,7.
Patent documentation 2 shows a kind of multiband antenna apparatus, and this multiband antenna apparatus possesses radiation electric
The 1st antenna part that pole is connected with current electrode via frequency variable circuit and by additional spoke
The 2nd antenna part that radio pole and current electrode are constituted, described additional radiation electrode and frequency variable circuit
Midway be connected and front end is open.
[prior art literature]
[patent documentation]
[patent documentation 1] Japanese Patent Laid-Open 2007-13596 publication
No. 4508190 publication of [patent documentation 2] Japanese Patent Laid
Summary of the invention
[inventing problem to be solved]
Including that multiband antenna apparatus shown in patent documentation 1,2, in design multiband sky
During line apparatus, about following Antenna Design key element it is generally required to meet the characteristic of regulation.
The radiation efficiency of (a) low-frequency band
The radiation efficiency of (b) high frequency band
(c) anti-resonance frequency
The resonant frequency of (d) low-frequency band
The resonant frequency of (e) high frequency band
Herein, " radiation efficiency of low-frequency band " is the radiation mode carrying out exciting under the basic model of λ/4
Efficiency under formula, " radiation efficiency of high frequency band " is to swash under the higher hamonic wave pattern of 3 λ/4
Efficiency under the radiation mode shaken." anti-resonance frequency " be radiating element length be the frequency of λ/2,
It is open from the point of view of supply terminals, is the frequency that electrical efficiency is minimum.
In the relation of " antenna efficiency=radiation efficiency × electrical efficiency ", above-mentioned (a) (b) (c) and spoke
Penetrating efficiency to be correlated with, (c) (d) (e) is relevant to electrical efficiency.
In the past, make radiating element at branched halfway, respectively a road distributed the radiating element of low-frequency band,
Radiating element to another road distribution high frequency band, the respective resonant frequency length by radiating element
With the interval between two radiating elements adjusts described characteristic.
But, in conventional method for designing, it is impossible to radiation efficiency and electrical efficiency are individually controlled,
Both become the relation of trade-off.Accordingly, because the shape of the high radiating element of radiation efficiency and electricity
The shape of the radiating element that force efficiency is high is different, it is therefore desirable to carry out repeatedly trade-off.
Such as, it is designed with following order.
(1) set between the open end of the open end of low-frequency band radiating element and high frequency band radiating element
Put interval, and determine the pattern of the two radiating element, make the open end of the radiating element of low-frequency band
It is positioned at from the farthest position of earth conductor with the open end of the radiating element of high frequency band.
(2) to length C till the branch point from supply terminals to radiating element, low-frequency band radiating element
Between between the open end of length A, length B of high frequency band radiating element and two radiating elements
Specify every Gap.
(3) adjust length A, length C and interval Gap, make the frequency of low-frequency band (return in low-frequency band
Damage minimum frequency) become setting.
(4) adjust length B, length C and interval Gap, make the frequency of high frequency band (return in high frequency band
Damage minimum frequency) become setting.
(5) adjust length A, length B and interval Gap, make the frequency of antiresonance point become setting.
(6) adjust length A and interval Gap, make the radiation efficiency of low-frequency band become maximum.
(7) adjust length B and interval Gap, make the radiation efficiency of high frequency band become maximum.
(8) check each characteristic value of above-mentioned (3)～(7), if having one undesirable, be returned to
(3) operation again it is adjusted.
Fig. 9 is the relation illustrating the variable quantity with each characteristic caused by the adjustment of each size above-mentioned
Figure.Consequently, it is possible to any one size in size A, B, C, Gap all can along with this adjustment with
Multiple characteristics in above-mentioned five characteristics change in linkage.Therefore, it is impossible to regardless of other characteristics pair
The characteristic needing the regulation adjusted individually is adjusted, the most time-consuming.
The present invention completes in view of the foregoing, its object is to provide one to set at short notice
Meter has the method for designing of the multiband antenna apparatus of the multiband antenna apparatus of desired characteristic.
[in order to solve the technical scheme of problem]
The present invention is the method for designing of a kind of multiband antenna apparatus, and this multiband antenna apparatus possesses: low
Frequency band radiating element, the 1st end of this low-frequency band radiating element is connected with radiating element branch circuit
Connect and the 2nd end is open；High frequency band radiating element, the 1st end of this high frequency band radiating element and institute
State radiating element branch circuit to be connected and the opening of the 2nd end；And earth conductor, this earth conductor with
Described low-frequency band radiating element carries out resonance action together with described high frequency band radiating element, described
The method for designing of multiband antenna apparatus is characterised by having: the 1st step, in the 1st step
In, the 1st end of described low-frequency band radiating element is arranged in the side close to described earth conductor,
2nd end is arranged in from described earth conductor side farther out, by described high frequency band radiating element
1st end is arranged in the side close to described earth conductor, is arranged in by the 2nd end and leads from described ground connection
Body side farther out, to described low-frequency band radiating element and the shape of described high frequency band radiating element
It is set, and determines to start to described low-frequency band to use from the supply terminals of described radiating element branch circuit
The 1st electrical length till 2nd end of radiating element, start to described high frequency band to use from described supply terminals
The 2nd electrical length till 2nd end of radiating element and being had from described radiating element branch circuit
Some branch points start the 3rd electrical length to described supply terminals；Second step, in the 2nd step
In Zhou, determine described 1st electrical length, described 2nd electrical length and described 3rd electrical length, make
The resonant frequency of low-frequency band becomes setting according to described 1st electrical length and described 3rd electrical length, high
The resonant frequency of frequency band becomes setting according to described 2nd electrical length and described 3rd electrical length, the most humorous
Vibration frequency becomes setting according to described 1st electrical length and described 2nd electrical length；And third step,
In this third step, determine the VSWR (Voltage loaded between power supply circuits and described supply terminals
Standing Wave Ratio: voltage standing wave ratio) component value of improvement impedance conversion element, make institute
The VSWR stated under the resonant frequency of low-frequency band and the resonant frequency of described high frequency band meets setting.
It is preferably and there is after described third step step repeatedly, in this repeatedly step, if antenna
Resonant frequency be not setting if, to described 1st electrical length, described 2nd electrical length and
Described 3rd electrical length is finely adjusted, and returns described second step.
Additionally, it is preferred that be the 2nd end of described low-frequency band radiating element and described high frequency band radiating element
The 2nd end mutually couple via electric capacity, in described second step, extra consider described electricity
Hold and determine the 1st electrical length, the 2nd electrical length and the 3rd electrical length.
[invention effect]
According to the present invention, the multiband antenna apparatus with desired characteristic can be designed at short notice.Separately
Outward, more preferable multiband antenna apparatus can be obtained.
Accompanying drawing explanation
Fig. 1 (A) is the axonometric chart of the multiband antenna apparatus 100 involved by embodiments of the present invention, figure
1 (B) is the axonometric chart observing multiband antenna apparatus 100 on the basis of the viewpoint of Fig. 1 (A) from rear.
Fig. 2 is the top view of multiband antenna apparatus 100.
Fig. 3 is the figure of current path and the electrical length illustrating multiband antenna apparatus 100.
Fig. 4 is the figure of resonant frequency and the anti-resonance frequency illustrating multiband antenna apparatus 100.
Fig. 5 is the figure of the design sequence illustrating the multiband antenna apparatus 100 shown in Fig. 1, Fig. 2.
Fig. 6 (A) is multiband antenna apparatus 100 and the multiband antenna of comparative example illustrating embodiment
The figure of the return loss characteristic (S11 of S parameter) of device, Fig. 6 (B) is the multiband antenna illustrating embodiment
The figure of the antenna efficiency of the multiband antenna apparatus of device 100 and comparative example.
Fig. 7 is the expanded view of the multiband antenna apparatus shown in patent documentation 1.
Fig. 8 be as comparative example with the congenital device of multiband gone out designed by conventional method for designing
The axonometric chart of 100P.
Fig. 9 is the figure of the relation illustrating the variable quantity with each characteristic caused by the adjustment of each size.
Detailed description of the invention
Fig. 1 (A) is the axonometric chart of the multiband antenna apparatus 100 involved by embodiments of the present invention, figure
1 (B) is the axonometric chart observing multiband antenna apparatus 100 on the basis of the viewpoint of Fig. 1 (A) from rear.
It addition, Fig. 2 is the top view of multiband antenna apparatus 100.
This multiband antenna apparatus 100 possesses printed wiring board 60 and antenna component 50, described chip sky
Line 50 is arranged on the ungrounded region of this printed wiring board 60.Antenna component 50 possess dielectric body 10,
And it is formed at low-frequency band radiating element 11 and the high frequency band radiation element on this dielectric body 10 surface
Part 12.Printed wiring board 60 possesses base material 8, is formed at the earth conductor 9 of this base material 8, Yi Jian
It is loaded on multiple chip component of base material 8.
As represented by Fig. 2, this multiband antenna apparatus 100 possess radiating element branch circuit 30,
Power supply circuits 32 and VSWR improve with impedance conversion element 31, described radiating element branch circuit
30 comprise the 1st reactance component X1, the 2nd reactance component X2 and the 3rd reactance component X3, described
VSWR improvement impedance conversion element 31 is supported between power supply circuits the 32 and the 3rd reactance component X3.
Such as, the 1st reactance component X1, the 2nd reactance component X2 and the 3rd reactance component X3 are senses
Anti-element (inducer).VSWR improvement impedance conversion element 31 is such as connected by along power supply direction
The inducer connected and the inducer being connected in parallel between supply terminals FP and ground connection are constituted, or by also
The inducer that connection is connected between supply terminals FP and ground connection is constituted.
1st end 111 of low-frequency band radiating element 11 is connected with radiating element branch circuit 30 and
2 ends 112 are open.It addition, high frequency band the 1st end 121 and radiating element branch of radiating element 12
Circuit 30 is connected and the 2nd end 122 is open.
1st end 111 of low-frequency band radiating element 11 is arranged in the side close to earth conductor 9,
2nd end 112 is arranged in from earth conductor side farther out.It addition, by high frequency band radiating element
1st end 121 of 12 is arranged in the side close to earth conductor 9, the 2nd end 122 is arranged in from
Earth conductor 9 side farther out.
Earth conductor 9 carries out humorous together with low-frequency band radiating element 11 and high frequency band radiating element 12
Vibration is made.That is the radiation to low-frequency band and high frequency band is made contributions.
Fig. 3 is the figure of current path and the electrical length illustrating multiband antenna apparatus 100.It addition, Fig. 4
It it is the figure of resonant frequency and the anti-resonance frequency illustrating multiband antenna apparatus 100.
In figure 3, start to low-frequency band to radiate to from the branch point BP of radiating element branch circuit 30
The 1st electrical length P1 till 2nd end 112 of element 11, start to high frequency band to use from branch point BP
The 2nd electrical length P2 till 2nd end 122 of radiating element 12 and from branch point BP start to
The 3rd electrical length P3 till supply terminals FP specifies.
In figure 3, according to the 1st electrical length P1 and the 3rd electrical length P3 with the mid frequency f of low-frequency bandL(example
Such as 900MHz) carry out 1/4 wave resonance.It addition, according to the 2nd electrical length P2 and the 3rd electrical length P3
Mid frequency f with high frequency bandH(such as 1800MHz) carries out 1/4 wave resonance.
In figure 3, anti-resonance frequency f is determined according to the 1st electrical length P1 and the 2nd electrical length P2a(example
Such as 1300MHz).I.e., in figure 3 according to electrical length P4 with anti-resonance frequency faCarry out 1/2 wavelength
Resonance.
Additionally, in figure 3, long according to the electricity determined by the 2nd electrical length P2 and the 1st electrical length P1
Degree P5 is with the mid frequency f of low-frequency bandLCarry out 3/4 wave resonance.
Fig. 5 is the figure of the design sequence illustrating the multiband antenna apparatus 100 shown in Fig. 1, Fig. 2.With
Following order design multiband antenna apparatus 100.
＜ the 1st step ＞
While considering the installing space of antenna component, distance to earth conductor, open end (the 2nd end)
Positions etc., are arranged in the 1st end 111 of low-frequency band radiating element 11 from earth conductor 9 relatively
Near side, is arranged in from earth conductor 9 side farther out, by high frequency band spoke by the 2nd end 112
The 1st end 121 penetrating element 12 is arranged in the side close to earth conductor 9, is joined by the 2nd end 122
Put from earth conductor 9 side farther out, to low-frequency band radiating element 11 and high frequency band radiation element
The shape of part 12 is set.It addition, determine to open from the supply terminals FP of radiating element branch circuit 30
Begin to the low-frequency band the 1st electrical length P1 the 2nd end 112 of radiating element 11, from supply terminals
FP start the 2nd electrical length P2 to the 2nd end 122 of high frequency band radiating element 12 and
The 3rd electricity that the branch point BP being had from radiating element branch circuit 30 starts to supply terminals FP
Length P3.
＜ second step ＞
Between branch point BP and low-frequency band radiating element 11, it is loaded with the 1st reactance component X1, is dividing
The 2nd reactance component X2 it is loaded with, at branch point BP between fulcrum BP and high frequency band radiating element 12
And it is loaded with the 3rd reactance component X3 between supply terminals FP, (comprises the 1st electricity according to the 1st electrical length P1
The electrical length of anti-element) and the 3rd electrical length P3 (electrical length comprising the 3rd reactance component) determine low frequency
Resonant frequency f of bandL, according to the 2nd electrical length P2 (comprising the electrical length of the 2nd reactance component) and the 3rd
Electrical length P3 determines resonant frequency f of high frequency bandH, according to the 1st electrical length P1 and the 2nd electrical length
P2 determines anti-resonance frequency fa.In other words, by the 1st electrical length P1 and the 3rd electrical length P3,
Resonant frequency f of low-frequency bandLBecome setting, by the 2nd electrical length P2 and the 3rd electrical length P3,
Resonant frequency f of high frequency bandHBecome setting, and determine the 1st reactance component X1, the 2nd reactance component
X2 and the 3rd respective component value of reactance component X3, make the value (degree of depth) of the return loss of low-frequency band with high
The value (degree of depth) of the return loss of frequency band is almost equal.
Additionally, as it is shown in figure 1, due to low-frequency band the 2nd end 112 and high frequency band of radiating element 11
Adjoining and relative with the 2nd end 122 of radiating element 12, therefore low-frequency band is with radiating element 11 He
High frequency band radiating element 12 mutually couples via electric capacity.In the case of that construction, volume
The described electric capacity of outer consideration determines the 1st reactance component X1, the 2nd reactance component X2 and the 3rd reactance
The respective component value of element X3.
＜ third step ＞
Between power supply circuits 32 and supply terminals FP (the 3rd reactance component X3), it is loaded with VSWR and improves
By impedance conversion element 31, resonant frequency f to low-frequency bandLResonant frequency f with high frequency bandHUnder
VSWR improves.In other words, determine that the VSWR meeting the VSWR of regulation improves with impedance transformation unit
The component value of part 31.
＜ the 4th step ＞
If the resonant frequency of antenna is not setting, to the 1st reactance component X1, the 2nd reactance element
The component value of part X2 and the 3rd reactance component X3 is finely adjusted, and returns described second step.
Then, it is shown that by the characteristic of the multiband antenna apparatus 100 designed by the method for designing of the present invention and
Characteristic as the multiband antenna apparatus of comparative example.
Fig. 8 is as comparative example, with the multiband antenna apparatus gone out designed by conventional method for designing
The axonometric chart of 100P.This multiband antenna apparatus 100P possesses printed wiring board 60 and antenna component 50P,
Described antenna component 50P is arranged on the ungrounded region of this printed wiring board 60.Antenna component 50P has
Standby dielectric body 10 and be formed at low-frequency band radiating element 11 and on this dielectric body 10 surface
High frequency band radiating element 12.Printed wiring board 60 possesses base material 8 and is formed at this base material 8
Earth conductor 9.In this multiband antenna apparatus 100P, low-frequency band is not enough by radiating element 11 induction reactance,
Therefore live width is made to attenuate to match with frequency.As described later, thus, the area of antenna diminishes, spoke
Penetrate inefficiency.It addition, for high frequency band radiating element 12, owing to consider and resonant frequency
Situation about matching, open end can not be configured to be considered the position (optimum bit that improved efficiency is the highest
Put).In the multiband antenna apparatus 100 of the present invention shown in Fig. 1, low-frequency band radiating element 11
Open end and the open end of high frequency band radiating element 12 can be oppositely disposed.Furthermore, it is contemplated that adjust
The situation of whole frequency, the low-frequency band open end of radiating element 11 and high frequency band radiating element 12
Interval between open end can shorten to 1mm, and radiation efficiency is low.The multiband antenna apparatus of the present invention
In 100, low-frequency band with the open end of the open end of radiating element 11 and high frequency band radiating element 12 it
Between interval become 2mm.
Fig. 6 (A) is to illustrate that the multiband antenna apparatus 100 of embodiments of the present invention and comparative example are many
The figure of the return loss characteristic (S11 of S parameter) of band antenna arrangement.It addition, Fig. 6 (B) is to illustrate embodiment party
The figure of the antenna efficiency of the multiband antenna apparatus 100 of formula and the multiband antenna apparatus of comparative example.Make
Multiband antenna apparatus for comparative example is the antenna with structure shown in Fig. 8.It is all with GSM (registration
Trade mark) 900 frequency be low-frequency band, with the frequency of GSM (registered trade mark) 1800 as high frequency band, with height
Frequently simulation software HFSS in 3 D electromagnetic field carries out the result emulated.In these figures, α is multiband sky
The characteristic of line apparatus 100, β is the characteristic of the multiband antenna apparatus of comparative example.
As represented by Fig. 6 (A), low reflection can be obtained according to the present invention, low-frequency band and high frequency band
Characteristic.It addition, as represented by Fig. 6 (B), can according to the present invention, low-frequency band and high frequency band
Obtain higher efficiency.In this example embodiment, can confirm that antenna efficiency improves about 0.5dB.It addition,
About to determining time of being spent antenna pattern and frequency, the method for designing of the present invention relative to
Conventional method for designing can only be designed with the time of about 1/5.
Parameter that the method for designing of the multiband antenna apparatus of the present invention can be specified by input also performs
Program exports design load.This program performs each step as shown in Figure 5 in order, inputs parameter
It is low-frequency band and the respective radiation efficiency of high frequency band, desired bandwidth and power attenuation.
Symbol description
BP: branch point
FP: supply terminals
P1: the 1 electrical length
P2: the 2 electrical length
P3: the 3 electrical length
X1: the 1 reactance component
X2: the 2 reactance component
X3: the 3 reactance component
8: base material
9: earth conductor
10: dielectric body
11: low-frequency band radiating element
12: high frequency band radiating element
30: radiating element branch circuit
31:VSWR improvement impedance conversion element
32: power supply circuits
50,50P: antenna component
60: printed wiring board
100,100P: multiband antenna apparatus
111: the 1st end of low-frequency band radiating element
112: the 2nd end of low-frequency band radiating element
121: the 1st end of high frequency band radiating element
122: the 2nd end of high frequency band radiating element
Claims (3)
1. a method for designing for multiband antenna apparatus, this multiband antenna apparatus possesses:
Low-frequency band radiating element, the 1st end of this low-frequency band radiating element is connected with radiating element branch circuit and the 2nd end is open；
High frequency band radiating element, the 1st end of this high frequency band radiating element is connected with described radiating element branch circuit and the 2nd end is open；And
Earth conductor, this earth conductor carries out resonance action together with described low-frequency band radiating element and described high frequency band radiating element,
The method for designing of described multiband antenna apparatus is characterised by having:
null1st step，In the 1st step，1st end of described low-frequency band radiating element is arranged in the side close to described earth conductor，2nd end is arranged in from described earth conductor side farther out，1st end of described high frequency band radiating element is arranged in the side close to described earth conductor，2nd end is arranged in from described earth conductor side farther out，The shape of described low-frequency band radiating element and described high frequency band radiating element is set，And determine that the branch point being had from described radiating element branch circuit starts the 1st electrical length to the 2nd end of described low-frequency band radiating element、The 2nd electrical length to the 2nd end of described high frequency band radiating element is started from described branch point、And the 3rd electrical length that the branch point being had from described radiating element branch circuit starts to supply terminals；
Second step, in this second step, determine described 1st electrical length, described 2nd electrical length and described 3rd electrical length, the resonant frequency making low-frequency band becomes setting according to described 1st electrical length and described 3rd electrical length, the resonant frequency of high frequency band becomes setting according to described 2nd electrical length and described 3rd electrical length, anti-resonance frequency according to described 1st electrical length and described 2nd electrical length between the resonant frequency and the resonant frequency of described high frequency band of described low-frequency band, this anti-resonance frequency be radiating element length be the frequency of λ/2；And
Third step, in this third step, determine the component value of the voltage standing wave ratio improvement impedance conversion element loaded between power supply circuits and described supply terminals, make the voltage standing wave ratio under the resonant frequency of described low-frequency band and the resonant frequency of described high frequency band meet setting.
2. the method for designing of multiband antenna apparatus as claimed in claim 1, it is characterised in that
The method for designing of described multiband antenna apparatus has step repeatedly after described third step, in this repeatedly step, if the resonant frequency of antenna is not setting, described 1st electrical length, described 2nd electrical length and described 3rd electrical length are finely adjusted, and return described second step.
3. the method for designing of multiband antenna apparatus as claimed in claim 1 or 2, it is characterised in that
2nd end of described low-frequency band radiating element and the 2nd end of described high frequency band radiating element mutually couple via electric capacity, and in described second step, the described electric capacity of extra consideration determines the 1st electrical length, the 2nd electrical length and the 3rd electrical length.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012072694A JP5590060B2 (en) | 2012-03-28 | 2012-03-28 | Multiband antenna device design method |
| JP2012-072694 | 2012-03-28 |
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| CN103367876A CN103367876A (en) | 2013-10-23 |
| CN103367876B true CN103367876B (en) | 2016-09-28 |
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| EP2741366A4 (en) | 2012-08-28 | 2015-02-25 | Murata Manufacturing Co | Antenna device, and communication terminal device |
| JP5700055B2 (en) * | 2013-01-17 | 2015-04-15 | 株式会社村田製作所 | Antenna device |
| CN103904421A (en) * | 2014-04-15 | 2014-07-02 | 深圳市中兴移动通信有限公司 | Multi-frequency antenna device and wireless communication terminal |
| WO2016076120A1 (en) * | 2014-11-14 | 2016-05-19 | 株式会社村田製作所 | Antenna device and communication device |
| CN107482312A (en) * | 2016-06-08 | 2017-12-15 | 宏碁股份有限公司 | Communicator with the ring antenna element of metal edge frame half |
| JP6954359B2 (en) | 2017-09-08 | 2021-10-27 | 株式会社村田製作所 | Dual band compatible antenna device |
| CN111656609B (en) * | 2018-01-31 | 2024-03-08 | 松下知识产权经营株式会社 | Antenna device |
| CN110635229A (en) * | 2018-06-22 | 2019-12-31 | 启碁科技股份有限公司 | Antenna structure |
| CN109655163B (en) * | 2018-12-25 | 2020-11-13 | 中国空气动力研究与发展中心超高速空气动力研究所 | Common view field multiband radiation intensity time-varying characteristic measuring device |
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| CN101111972B (en) * | 2005-01-27 | 2015-03-11 | 株式会社村田制作所 | Antenna and wireless communication device |
| JP4649634B2 (en) * | 2005-06-30 | 2011-03-16 | 独立行政法人情報通信研究機構 | Multiband monopole antenna |
| TWI466375B (en) * | 2010-01-19 | 2014-12-21 | Murata Manufacturing Co | An antenna device and a communication terminal device |
| CN102157794B (en) * | 2010-02-12 | 2013-08-14 | 大众电脑股份有限公司 | Three-frequency band antenna produced by resonating |
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| JP4761009B1 (en) * | 2010-08-11 | 2011-08-31 | 株式会社村田製作所 | Frequency stabilization circuit, antenna device, and communication terminal device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103367876A (en) | 2013-10-23 |
| JP5590060B2 (en) | 2014-09-17 |
| JP2013207438A (en) | 2013-10-07 |
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