CN106848534B - Slot antenna and its manufacturing method are closed applied to metal chassis - Google Patents
Slot antenna and its manufacturing method are closed applied to metal chassis Download PDFInfo
- Publication number
- CN106848534B CN106848534B CN201710075137.7A CN201710075137A CN106848534B CN 106848534 B CN106848534 B CN 106848534B CN 201710075137 A CN201710075137 A CN 201710075137A CN 106848534 B CN106848534 B CN 106848534B
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- antenna
- metal
- slot antenna
- fine tuning
- exciter
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
-
- 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
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Waveguide Aerials (AREA)
- Details Of Aerials (AREA)
Abstract
The invention discloses a kind of slot antennas that closes applied to metal chassis, including metal chassis, antenna exciter and plastic parts；The metal chassis includes a locked groove pore structure and installation position corresponding with the locked groove pore structure, and the metal chassis is used for electrical ground；The antenna exciter includes at least one fine tuning metal unit, feeding portion and grounding parts, and the antenna exciter is set to installation position for the locked groove pore structure of complexed metal casing and then slot antenna is closed in excitation；The plastic parts is made of embedment ejection formation, the plastic parts coats at least part of the antenna exciter, and the plastic parts has at least one the fine tuning metal unit of fine tuning form to the exposed antenna exciter, the degree that the fine tuning metal unit needs to be lasered to determine fine tuning metal unit according to the return loss for closing slot antenna, uses the return loss that slot antenna is closed in fine tuning.This, which closes slot antenna, can avoid the influence of various tolerances when volume production, improve yield.
Description
Technical field
The present invention relates to a kind of antenna and its manufacturing methods, more particularly to a kind of locked groove hole applied to metal chassis day
Line and its manufacturing method.
Background technique
The casing of laptop or tablet computer product gradually uses metal chassis, can promote degree aesthetic in appearance
With product texture.But metal chassis is a challenge for the design of antenna.In addition, in terms of assembling product, antenna element
When being integrated with product structure, the problem of involving manufacturing tolerance and assemble tolerance, so that its antenna of each product in volume production
Operating frequency be not quite similar with impedance matching.In order to ensure the antenna performance after the completion of product and antenna assemblies meets design rule
Lattice, such as return to loss (Return Loss), impedance bandwidth.If using traditional fabrication scheme, when each manufactured production
When product have foozle, then each product must be adjusted or be re-assemblied individually, so be to be difficult to decrease volume production manufacture
Cost.
Summary of the invention
Slot antenna and its manufacturing method are closed applied to metal chassis the present invention provides a kind of, product volume production group is provided
The error solution of dress, to promote product yield and reduce manufacturing cost.
Technical solution of the present invention is as follows: a kind of slot antenna that closes applied to metal chassis, including metal chassis, antenna swash
Send out device and plastic parts；The metal chassis includes a locked groove pore structure and installation position corresponding with the locked groove pore structure,
The metal chassis is used for electrical ground；The antenna exciter includes at least one fine tuning metal unit, feeding portion and ground connection
Portion, the antenna exciter are set to installation position for the locked groove pore structure of complexed metal casing and then excite locked groove hole day
Line；The plastic parts is made of embedment ejection formation, which coats at least part of the antenna exciter, and the modeling
Glue part has at least one the fine tuning metal unit of fine tuning form to the exposed antenna exciter, the fine tuning metal unit
The degree for needing to be lasered to determine fine tuning metal unit according to the return loss for closing slot antenna, uses fine tuning locked groove
The return of hole antenna is lost.
Further, including coaxial wire, the center conductor of the coaxial wire couple the antenna exciter
Feeding portion, the outer contact of the coaxial wire couple the antenna exciter grounding parts and the metal chassis.
Further, including copper foil, the copper foil is to slide grounding parts and metal in a manner of weldering with the antenna exciter
Casing connection.
Further, the size of the fine tuning metal unit is laser machined using laser cutting machine and is reduced to subtract
The return loss for closing slot antenna less and the difference with reference to return loss.
Further, the metal chassis is the metal back cover of electronic device.
A kind of manufacturing method for closing slot antenna applied to metal chassis, comprising the following steps:
Locked groove pore structure and installation position corresponding with locked groove pore structure, institute are made to metal chassis using numerically-controlled machine tool
Metal chassis is stated for electrical ground；
Antenna exciter is provided, the antenna exciter includes that at least one finely tunes metal unit, feeding portion and grounding parts,
The antenna exciter is set to installation position for the locked groove pore structure of complexed metal casing and then slot antenna is closed in excitation；
The antenna exciter is set to the installation position, and is coated plastic parts using embedment injection forming method
At least part of the antenna exciter, and there is the plastic parts at least one fine tuning form to excite to the exposed antenna
The fine tuning metal unit of device；
The center conductor of coaxial wire couples to the feeding portion of the antenna exciter, and by the outer layer of coaxial wire
Conductor couples the grounding parts and metal chassis of the antenna exciter；
And the return loss for closing slot antenna is obtained, and lose with return according to the return loss for closing slot antenna
The difference of specification is to determine the degree finely tuned metal unit and need to be lasered.
Further, the return loss of slot antenna and the difference of return loss specification are closed described in the foundation to determine
Stating the step of fine tuning metal unit needs the degree being lasered includes:
Compare the difference of the return loss for closing slot antenna and return loss specification, and according to the locked groove hole day
The return loss of line laser machines the fine tuning metal unit of stating with the difference for returning to loss specification, then obtains laser
The return loss for closing slot antenna after processing.
Further, in the step of obtaining the return loss for closing slot antenna, by coaxial wire connection network point
Analyzer closes the return loss of slot antenna to obtain.
Further, the return loss of slot antenna and the difference of return loss specification are closed described in the foundation to determine
In the step of stating the degree that fine tuning metal unit needs to be lasered, using control equipment control laser cutting machine according to described in
The fine tuning metal unit is cut in the Network Analyzer return loss obtained for closing slot antenna, the control equipment
With data memory unit, the data memory unit storage returns to loss specification, and the control equipment controls laser cutting machine
Reduce the size of the fine tuning metal unit to reduce the return loss and the difference of return loss specification of closing slot antenna.
Further, the grounding parts and metal machine that the outer contact of coaxial wire is coupled to the antenna exciter
In the step of shell, copper foil is connect in a manner of weldering by sliding with the grounding parts of the antenna exciter and metal chassis.
The advantages of technical solution provided by the present invention is: antenna laser trimming form allows to complete in assembling product
Afterwards, antenna performance is further finely tuned using laser processing.Whereby, tolerance issues when volume production can be discharged, it is good that product is substantially improved
Rate, and final optimization can be carried out for the antenna performance of each product in the actual production process.
Detailed description of the invention
Fig. 1 is the schematic diagram for closing slot antenna applied to metal chassis of the invention.
Fig. 2 is the partial schematic diagram of metal chassis.
Fig. 3 is the assembling schematic diagram of metal chassis and antenna exciter.
Fig. 4 is the schematic diagram that plastic parts covers antenna exciter.
Fig. 5 is the perspective diagram that plastic parts covers antenna exciter.
Fig. 6 is the partial enlargement diagram for closing slot antenna applied to metal chassis.
Fig. 7 is the manufacturing method flow chart for closing slot antenna that the present invention is applied to metal chassis.
Fig. 8 is the sub-step flow chart of step S150.
Fig. 9 is that step S150 realizes the schematic diagram repeatedly cut to fine tuning metal unit.
Specific embodiment
Below with reference to embodiment, the invention will be further described, but not as a limitation of the invention.
The present embodiment be applied to metal chassis close slot antenna and its manufacturing method is one can promote product yield
And reduce the scheme of volume production cost.Metal chassis can be the metal back cover of electronic device, such as the upper cover gold of laptop
Belong to the metal back cover of lid either tablet computer.The present embodiment processes metal chassis using numerically-controlled machine tool, can make
One locked groove hole (Slot) structure 11 closes the foundation structure of slot antenna as excitation such as Fig. 2, and 1 inside of metal chassis then assembles
Antenna related elements (including antenna exciter 2 in the present embodiment), as shown in Figure 1.In order to by antenna related elements and metal machine
Shell assembling traditionally needs to consider the problems of the manufacturing tolerance and assembling tolerance of each element.It is different from traditional fabrication scheme,
The embodiment of the present invention uses insert molding (Insert Molding) mode when assembling antenna exciter 2 and metal chassis 1,
Plastic cement (plastic parts 3) is set to envelope antenna exciter 2 and metal chassis 1, as shown in Figure 4.And expose copper foil in regional area
The partial enlarged view of the assembled finished product combination feeder of groove structure 32. of attached area 4 and feeder (cable) is such as
Shown in Fig. 6.In addition, using the mode of sliding bit copper foil 6 in manufacture means, and the attaching of copper foil 6 metal chassis 1 is grounded
(Grouding), and carry out feeder line bonding wire.The embodiment of the present invention is described further below.
Referring to figure 2. to Fig. 6, the present embodiment closes slot antenna applied to metal chassis comprising metal chassis 1,
Antenna exciter 2 and plastic parts 3.As shown in Fig. 2, metal chassis 1 has locked groove pore structure 11 and corresponding locked groove pore structure 11
Installation position 12, metal chassis 1 be used for electrical ground.As shown in figure 3, antenna exciter 2 has at least one fine tuning metal
Unit 21, feeding portion 22 and grounding parts 23, antenna exciter are set to installation position 12, the locked groove to complexed metal casing 1
Pore structure 11 excites close slot antenna in turn, and the slot antenna that closes for example excites two operation mode, meets respectively
The mode of 2.4GHz frequency band and the mode of 5GHz frequency band, but the present invention is not limited by this.Referring to Fig. 4 and Fig. 5,3 benefit of plastic parts
It is made with embedment ejection formation, coats at least part of antenna exciter 2.And plastic parts 3 has at least one fine tuning view
Fine tuning metal unit 21 of the window 31 to exposed antenna exciter 2 all shows two fine tuning forms 31 in Fig. 4 and Fig. 5.Its
In, fine tuning metal unit 21 is to determine fine tuning metal unit 21 according to the return loss (return loss) for closing slot antenna
It needs to be lasered and the degree of size reduction, the return loss of slot antenna is closed in fine tuning whereby.Fig. 3 and Fig. 6 are referred again to, benefit
The grounding parts 23 that metal chassis 1 and antenna exciter 2 are attached with copper foil 6 can be used sliding weldering mode by copper foil 6 in practical operation
The grounding parts 23 and metal chassis 1 for connecting antenna exciter use the electrical connection (or to couple) between strengthening.And day
In terms of line feeder line, using coaxial wire 5 and it is welded and fixed.Detailed production process please refers to saying for following embodiment
It is bright.
In order to manufacture it is mentioned-above close slot antenna applied to metal chassis, the present embodiment provides be applied to metal machine
The manufacturing method for closing slot antenna of shell.Fig. 7 is please referred to, the method is the following steps are included: firstly, in step s 110, utilize
Numerically-controlled machine tool makes the installation position 12 of locked groove pore structure 11 and the corresponding locked groove pore structure 11 to metal chassis 1, such as Fig. 2 institute
Show, the metal chassis 1 is used for electrical ground.Then, in the step s 120, antenna exciter 2, the antenna exciter are provided
2 have at least one fine tuning metal unit 21, feeding portion 22 and grounding parts 23, as shown in Figure 3.The antenna exciter 2 to
The locked groove pore structure 11 of complexed metal casing 1 excites close slot antenna in turn.Then, in step s 130, the antenna is swashed
Hair device 2 is set to installation position 12, and plastic parts 3 is coated at least part of antenna exciter 2 using embedment ejection formation,
Referring to Fig. 4.And the plastic parts 3 has at least one the fine tuning metal unit of fine tuning form 31 to exposed antenna exciter 2
21.In addition, Fig. 5 is the perspective view drawn according to Fig. 4.
Then, in step S140, by the feeding portion 22 of the 51 coupling antenna exciter 2 of center conductor of coaxial wire 5,
And by the grounding parts 23 of 52 coupling antenna exciter 2 of the outer contact of coaxial wire 5 and metal chassis 1, referring to Fig. 3, Fig. 4
Groove structure 32 and Fig. 6.The feeding portion of the 51 coupling antenna exciter 2 of center conductor by coaxial wire 5 in step S140
22 mode is using welding manner, and general solder can be realized.In step S140, will coaxial wire 5 it is outer
The step of grounding parts 23 of layer 52 coupling antenna exciter 2 of conductor and metal chassis 1, can for example slide bit copper foil 6 (shown in Fig. 6),
Copper foil 6 to be connected to the grounding parts 23 (the copper foil attached area 4 of comparative diagram 4) and metal chassis 1 of antenna exciter 2.To antenna
For exciter 2, in simplest example, the grounding parts 23 of antenna exciter 2 done with copper foil attached area 4 it is be overlapped, also
It is that the copper foil attached area 4 of antenna exciter 2 covers grounding parts 23.In actual operation, as long as contacting copper foil 6 securely
Grounding parts 23.
Then, in step S150, the return loss for closing slot antenna is obtained, and according to the return loss for closing slot antenna
Determine the degree that fine tuning metal unit 21 needs to be lasered.In step S150, the return loss for closing slot antenna is obtained
Step is, for example, that coaxial wire 5 is connected Network Analyzer (network analyzer) to obtain the return for closing slot antenna
Loss, and the program for measuring the return loss for closing slot antenna can be automated in volume production production line.
The implementation of step S150 is, for example, to control laser cutting machine using control equipment, makes laser cutting machine according to net
Network analyzer (or volume production equipment with equivalent function) the return loss obtained for closing slot antenna is to fine tuning metal list
Member 21 is cut, wherein control equipment has data storage element, the storage of data storage element returns to loss specification, and control is set
The standby size for controlling laser cutting machine reduction fine tuning metal unit closes return loss and the return loss rule of slot antenna to reduce
The difference of lattice.The automation design of hardware and software of above-mentioned control equipment is that the engineer of volume production planning is easy to accomplish, not originally
The purpose of invention, therefore do not repeat them here.
Specifically, the sub-step that step S150 for example can use circulation is realized, Fig. 8 is please referred to, firstly, carrying out step
S151 compares the return loss and the difference of return loss specification for closing slot antenna.So-called return loss specification for example including
The return loss minimum standard met needed for frequency range and frequency range, such as in the range of frequency band 2.4GHz to 2.5GHz,
It returns to loss to need better than 10dB (corresponding voltage standing wave ratio (VSWR) is about 2:1), but the present invention is not limited by this.So
Afterwards, step S153 is carried out, judges to return to whether loss (losing specification compared to returning) meets specification, that is, whether meet and return
Minimum standard is lost in return loss.If returning to loss meets specification, step S157 is carried out, is shut down procedure.If returning to loss does not meet rule
Model then carries out step S155, according to the return loss for closing slot antenna and the difference for returning to loss specification to fine tuning metal unit
21 are laser machined, and the return loss for closing slot antenna after being laser machined.Then, step S151 is returned to carry out
Circulation.That is, according to the return loss for closing slot antenna and the difference of return loss specification that are obtained after being laser machined
The different program for needing to be lasered again with decision fine tuning metal unit 21.For example, setting laser processing cutting fine tuning every time
One minimum radius of metal unit 21 cyclically carries out step S151 to step S155 so as to close the return loss of slot antenna
Return loss specification is gradually approached, terminates program (step S157) if meeting specification.Fine tuning in diagram of the embodiment of the present invention
Metal unit 21 is only a kind of exemplary design method, and the design according to antenna in practical operation is different, finely tunes metal unit
21 quantity may be different from structure, and the present invention does not limit structure, shape and the quantity of fine tuning metal unit 21.
Fig. 9 shows that step S150 realizes the schematic diagram to metal unit more than 21 times cuttings of fine tuning.In the example of figure 9, when
After an other component tolerances and assembling tolerance has been considered, the structure of design fine tuning metal unit 21 substantially excites antenna
The centre frequency (central frequency) for closing slot antenna excited after metal chassis 1 is loaded onto for 2 groups of device substantially must
When lower than the centre frequency for returning to loss specification, fine tuning metal unit 21 is gradually laser machined, and laser processing every time
All measurement returns to loss again afterwards, uses and judges to return to whether loss meets return loss specification (or for frequency band specification).Such as
This, if the product of each volume production does not meet return after finishing assembly, loss specification can do Automatic Optimal in producing line,
To reach Yield lmproved and avoid the problem that construct again (rework).Furthermore finely tune the structure and size example of metal unit 21
If the reserved length (or width) using several millimeters to tens of milliseconds is as the region that may be lasered, manufactured with compensating element,
Tolerance and assembling tolerance.The the reserved area for finely tuning metal unit 21 the more, can endure more tolerances, finely tune metal unit 21
Reserved area it is more few, can to avoid laser processing number it is excessive and extend manufacturing time (manufacturing time be also it is important at
This).
In conclusion slot antenna machine manufacturing method is closed applied to metal chassis provided by the embodiment of the present invention,
It is allowed after the completion of assembling product using antenna laser trimming form, further finely tunes antenna performance using laser processing.
Whereby, tolerance issues when volume production can be excluded, product yield are substantially improved, and can be in the actual production process for each
The antenna performance of product carries out the final optimization on volume production line.
Claims (10)
1. a kind of close slot antenna applied to metal chassis, it is characterised in that: including metal chassis, antenna exciter and plastic cement
Part；The metal chassis includes a locked groove pore structure and installation position corresponding with the locked groove pore structure, the metal machine
Shell is used for electrical ground；The antenna exciter includes at least one fine tuning metal unit, feeding portion and grounding parts, the antenna
Exciter is set to installation position for the locked groove pore structure of complexed metal casing and then slot antenna is closed in excitation；The plastic parts
It is made of embedment ejection formation, which coats at least part of the antenna exciter, and the plastic parts has at least
Fine tuning metal unit of one fine tuning form to the exposed antenna exciter, the fine tuning metal unit is to according to locked groove
The return loss of hole antenna determines that fine tuning metal unit needs to be used fine tuning by the degree of laser cutting process and closed slot antenna
Return to loss.
2. according to claim 1 close slot antenna applied to metal chassis, which is characterized in that including coaxial cable
Line, the center conductor of the coaxial wire couple the feeding portion of the antenna exciter, and the outer layer of the coaxial wire is led
Body couple the antenna exciter grounding parts and the metal chassis.
3. according to claim 1 close slot antenna applied to metal chassis, which is characterized in that described including copper foil
Copper foil is connect in a manner of weldering by sliding with the grounding parts of the antenna exciter and metal chassis.
4. according to claim 1 close slot antenna applied to metal chassis, which is characterized in that the fine tuning metal list
Member size using laser cutting machine laser machined and be reduced to reduce close slot antenna return loss with refer to return
The difference that return loss is lost.
5. according to claim 1 close slot antenna applied to metal chassis, which is characterized in that the metal chassis is
The metal back cover of electronic device.
6. a kind of manufacturing method for closing slot antenna applied to metal chassis, which comprises the following steps:
Locked groove pore structure and installation position corresponding with locked groove pore structure, the gold are made to metal chassis using numerically-controlled machine tool
Belong to casing and is used for electrical ground；
Antenna exciter is provided, the antenna exciter includes that at least one finely tunes metal unit, feeding portion and grounding parts, described
Antenna exciter is set to installation position for the locked groove pore structure of complexed metal casing and then slot antenna is closed in excitation；
The antenna exciter is set to the installation position, and described in using embedment injection forming method coating plastic parts
At least part of antenna exciter, and the plastic parts has at least one fine tuning form to the exposed antenna exciter
Finely tune metal unit；
The center conductor of coaxial wire couples to the feeding portion of the antenna exciter, and by the outer contact of coaxial wire
Couple the grounding parts and metal chassis of the antenna exciter；
And the return loss for closing slot antenna is obtained, and according to the return loss for closing slot antenna and return loss specification
Difference to determine that the fine tuning metal unit is needed by the degree of laser cutting process.
7. the manufacturing method according to claim 6 that close slot antenna applied to metal chassis, which is characterized in that described
According to described in close slot antenna return loss with return loss specification difference with determine the fine tuning metal unit need by
The step of degree of laser cutting process includes:
Compare it is described close slot antenna return loss and the difference that returns to loss specification, and according to the slot antenna that closes
It returns to loss and laser cutting process is carried out to the fine tuning metal unit with the difference for returning to loss specification, then obtain laser and cut
The return loss for closing slot antenna after cutting processing.
8. the manufacturing method according to claim 6 that close slot antenna applied to metal chassis, which is characterized in that obtain
In the step of closing the return loss of slot antenna, coaxial wire connection Network Analyzer is closed into slot antenna to obtain
Return to loss.
9. the manufacturing method according to claim 8 that close slot antenna applied to metal chassis, which is characterized in that described
According to described in close slot antenna return loss with return loss specification difference with determine the fine tuning metal unit need by
In the step of degree of laser cutting process, obtained using control equipment control laser cutting machine according to the Network Analyzer
The return loss for closing slot antenna the fine tuning metal unit is cut, the control equipment is with data storage list
Member, the data memory unit storage return to loss specification, and the control equipment control laser cutting machine reduces the fine tuning gold
Belong to the size of unit to reduce the return loss and the difference of return loss specification of closing slot antenna.
10. the manufacturing method according to claim 6 that close slot antenna applied to metal chassis, which is characterized in that institute
State in the step of outer contact of coaxial wire is coupled the grounding parts and metal chassis of the antenna exciter, by copper foil with
Sliding weldering mode is connect with the grounding parts of the antenna exciter and metal chassis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710075137.7A CN106848534B (en) | 2017-02-13 | 2017-02-13 | Slot antenna and its manufacturing method are closed applied to metal chassis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710075137.7A CN106848534B (en) | 2017-02-13 | 2017-02-13 | Slot antenna and its manufacturing method are closed applied to metal chassis |
Publications (2)
| Publication Number | Publication Date |
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| CN106848534A CN106848534A (en) | 2017-06-13 |
| CN106848534B true CN106848534B (en) | 2019-06-04 |
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| CN201710075137.7A Active CN106848534B (en) | 2017-02-13 | 2017-02-13 | Slot antenna and its manufacturing method are closed applied to metal chassis |
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| CN110506361B (en) | 2018-03-16 | 2021-02-19 | 惠普发展公司，有限责任合伙企业 | Antenna for metal housing |
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| CN2619419Y (en) * | 2003-05-28 | 2004-06-02 | 广达电脑股份有限公司 | Portable radio device |
| US7170366B2 (en) * | 2005-02-11 | 2007-01-30 | Andrew Corporation | Waveguide to microstrip transition with a 90° bend probe for use in a circularly polarized feed |
| CN101409381A (en) * | 2007-10-12 | 2009-04-15 | 达创科技股份有限公司 | Wireless transmission/receive unit, wideband antenna and method for adding antenna bandwidth |
| CN103794844A (en) * | 2012-11-02 | 2014-05-14 | 宏碁股份有限公司 | Radiation characteristic control method and device for liquid antenna |
| TW201507262A (en) * | 2013-08-02 | 2015-02-16 | Honglin Technology Co Ltd | Proximity sensing apparatus and radio frequency system with adaptive wireless transmitting power |
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