CN108282169A - A kind of radio-frequency match structure and radio frequency matching circuit being easy to debugging - Google Patents
A kind of radio-frequency match structure and radio frequency matching circuit being easy to debugging Download PDFInfo
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- CN108282169A CN108282169A CN201810093983.6A CN201810093983A CN108282169A CN 108282169 A CN108282169 A CN 108282169A CN 201810093983 A CN201810093983 A CN 201810093983A CN 108282169 A CN108282169 A CN 108282169A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
Abstract
The invention discloses a kind of radio-frequency match structures being easy to debugging and radio frequency matching circuit, structure to include：Pad；The pad be equipped with one can pad sliding relatively matching element.First sub- pad described in radio frequency matching circuit is connect with RF signal output, the second sub- pad ground connection.Radio frequency debugging of the present invention is more convenient to be easy, debug ideality higher, the radio frequency R＆D cycle can greatly be shortened, reduce R＆D costs, in addition, matching device only has one, entirety occupies little space, device arrangement space-saving, and reproducibility is high, practicability is good, and the radio-frequency enabled for being particularly suitable for miniature device uses.
Description
Technical field
The present invention relates to technology for radio frequency field more particularly to a kind of radio-frequency match structures and radio frequency being easy to debugging
With circuit.
Background technology
The electronic product using wireless communication every at present can all be related to the concept of radio frequency, so-called radio frequency (abbreviation RF), just
Be it is a kind of with remote transmittability high-frequency ac variation electromagnetic wave, frequency range between 300KHz~300GHz,
The circuit for generating radiofrequency signal is exactly radio circuit, and RF transmit-receive circuit, radio frequency matching circuit, coupling are generally included in radio circuit
Clutch, power amplifier, filter, antenna etc..
Due to radiofrequency signal from generate to the process emitted through antenna due to the shadow of circuit devcie performance, trace arrangements etc.
It rings, will produce certain function loss, in order to by the transmission of radiofrequency signal low distortion, ensure to transmit maximum signal energy
Amount reduces influence of the echo to signal quality and available power, and other than reducing unnecessary device use to the greatest extent, radio frequency debugging is
It is essential；Radio frequency debugging process is exactly to help radio circuit to realize institute to meet the requirement of terminal impedance performance indicator
The process for needing the low distortion of frequency range to communicate.Circuit for realizing radio frequency debugging is just radio frequency matching circuit, radio frequency matching circuit
The matching, it can be achieved that impedance is generally formed by multiple capacitances, inductance.
Usually, it for the performance requirement that the parameter that radio frequency debugging process is debugged out more meets actual circuit, actually penetrates
Frequency modulation carries out directly on actual circuit when trying, and existing radio frequency matching circuit mostly uses multiple discrete component arrangement cablings
The matching network (such as π types or L-type matching network) of formation is matched by changing the value of inductance capacitance of discrete component to realize
Purpose；Although radiofrequency signal can be matched preferably, the transmission of signal low distortion is ensured, discrete component is more, on the one hand
Structure itself occupy arrangement space it is big, be unfavorable for radio frequency products miniaturization, on the other hand due to arrangement space limitation arrangement
Closely, it is unfavorable for device replacement, be easy to cause the damage of actual circuit, and discrete component is more, influences tuning parameter change
Factor is just more, this makes debugging process difficulty increase, and the time is elongated, and is difficult to reach putting into a large amount of time and efforts sometimes
To index request, debugging can only be re-started, it is easy to cause R＆D costs to increase, grind in such a way that correcting changes cabling
Send out period lengthening.
As the patent document of Publication No. CN106788563A discloses a kind of " matching network electricity of terminal radio frequency circuit
Road ", including π types or L-type matching network circuit and parallel circuit, wherein described parallel circuit one end connects the π types or L-type
Matching network circuit input terminal, other end ground connection, wherein the parallel circuit includes a capacitance and an inductance for parallel connection,
It is grounded after the capacitance and inductance in parallel.Its convergence can be improved to radio circuit while changing a frequency range port Impedance
Property.But since discrete component is too many, this do not only result in cost increase, and can make PCB layout it is more inconvenient, be easy because space by
Limit, while debugging process needs replacing multiple devices, can elongate the period of debugging, is also easy to encounter difficult the problem of adjusting.
Invention content
It is few the technical problem to be solved by the present invention is in view of the above shortcomings of the prior art, provide a kind of component, it occupies
Space is small, is conducive to device and arranges, and it is more convenient easy to debug, and tuning parameter continuity is good, impedance matching accuracy higher, it is easier to
The impedance of actual circuit is transformed to required impedance, radio frequency R＆D cycle and cost can be greatly shortened, realizes that radiofrequency signal is high
A kind of radio-frequency match structure and radio frequency matching circuit being easy to debugging of mass transport.
To achieve the goals above, the technical solution adopted by the present invention is：
A kind of radio-frequency match structure being easy to debugging, including：Pad；The pad is equipped with one can the relatively described pad cunning
Dynamic matching element.
Further, the length of the pad is not more than half wavelength.
Further, the matching element is inductance.
Further, the matching element is capacitance.
Further, the pad includes the first sub- pad and the second sub- pad, the first sub- pad and described second
The non-touching setting of both sub- pads, described matching element one end are connect with the described first sub- pad, the other end and described the
Two sub- pad connections.
Further, the length of the described first sub- pad is not more than half wavelength, described matching element one end and institute
State the first sub- pad slidable connection.
Further, the matching element other end is fixedly connected with the described second sub- pad.
Further, the described first sub- pad and the second sub- pads parallel setting.
Further, described matching element one end and the described first sub- pad slidable connection, the other end and described second
Sub- pad slidable connection.
A kind of radio frequency matching circuit, including the radio-frequency match structure for being easy to debugging described above, the first sub- pad
It is connect with RF signal output, the second sub- pad ground connection.
After adopting the above technical scheme, the beneficial effects of the invention are as follows：Other discrete components are set and are patched without passing through
Device, the directly opposite sliding on the pad by the matching element, or change the matching element reactive and
Reactance value or the length for changing pad achieve that the matching of impedance；The mode of debugging is various, can choose debugging side on demand
Formula disclosure satisfy that the impedance matching demand under a variety of practical application scenes；And entire mating structure is only there are one component, at
While this is low, additionally it is possible to simplify line layout, reduce the occupancy of arrangement space, be conducive to the miniaturization of radio frequency products.
Using the matching element with respect under the debud mode of sliding on the pad, the continuity of impedance transformation is good,
Be conducive to the impedance value that fast debugging goes out to meet actual circuit demand, greatly shorten radio frequency R＆D cycle and cost.
Description of the drawings
In order to illustrate the embodiments of the present invention more clearly or the technical solution of the prior art, attached drawing are as follows：
Fig. 1 is the radio-frequency match structural schematic diagram for being easy to debugging of the embodiment of the present invention 1；
Fig. 2 is the Smith chart of the radio-frequency match structure for being easy to debugging of the embodiment of the present invention 1；
Fig. 3 is another Smith chart of the radio-frequency match structure for being easy to debugging of the embodiment of the present invention 1；
Fig. 4 is the radio frequency matching circuit application block diagram of the embodiment of the present invention 2.
Specific implementation mode
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
It is every carrying radio function in electronic product, it can all be related to radio-frequency match, radio-frequency match is generally all obtained according to reality
The circuit board on border is debugged, the theory of debugging be also mostly it is identical, generally by the reactive that changes related elements or
Reactance value completes debugging process, since its circuit setting itself limits, once encounter the frequency range of difficult tune, can only correcting change
Line is debugged again, and R＆D costs is caused to increase, cycle stretch-out.
The radio-frequency match structure that in addition, there will be all constitutes π types or L-type by discrete component, uses
Change the value of the capacitor and inductor of discrete component to reach matched purpose.Disadvantage is exactly that discrete component is too many, this is not only resulted in into
This increase, and the layout of circuit board can be made more inconvenient is also exactly that the adjustment method that illustrates before is single, when encountering difficult tune
The problem of when, the few problem of solution.
The present invention is directed to the use disadvantage occurred using the radio-frequency match structure that discrete component is constituted in existing electronic product,
The radio-frequency match structure realized using slidably debud mode is proposed, the cabling of this structure design mainly uses the signal of pad
It holds to substitute so that pad becomes a part for mating structure, and one matching element of setting is realized that it can be slided with respect to pad, made
For another part of mating structure, the mating structure of the final complete present invention is formed, to help to realize radiofrequency signal impedance matching；
Design based on above structure, the present invention can improve required impedance value difficulty tune in the prior art, and the R＆D cycle is long, of high cost
Problem enables to circuit-board laying-out more simplified, debug it is more convenient be easy, tuning parameter continuity is good, accuracy also higher.
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of radio-frequency match structures being easy to debugging, including：Pad 100；The weldering
Disk 100 is equipped with one can the pad 100 slides relatively matching element 200.
In microwave transmission system, impedance matching network is related to efficiency of transmission, power capacity and the job stability of system,
It is related to the systematic error and measurement accuracy and a series of problems, such as the quality of microwave device of microwave measurement.Therefore impedance
Matching network design is most important to the high-quality transmission of the radiofrequency signal of radio circuit.
In the design process of radio circuit, the equivalent circuit and equivalent circuit to lumped-circuit are used from impedance matching device
Emulation and last circuit layout, the problem of radio circuit designer must take into account impedance matching, and its best work
Tool is Smith chart.Carrying out detection circuit with Smith chart, there are a series of problems, such as its theoretic input impedance and output
Whether whether impedance matches with characteristic impedance, and matched to the frequency response of specific high frequency after actual circuit layout.
Further, since the integration of communication part and semiconductor technology now, the gradual microminiaturization of component simultaneously makes communication IC become
The component to become increasingly complex, so, the defect on existing matched design becomes increasingly conspicuous, such as Structural assignments are close, occupies empty
Between more or even some defects be also not easy test when be found come so that radio frequency debugging process is more difficult, increases debugging
Duration.Thus change circuit structure appropriate tackles the problem at its root, a preferable method of can yet be regarded as.
Circuit design appropriate and layout can make radio circuit designer from the mistake of foregoing circuit, in fact, existing
High-frequency circuit designing technique the circuit layout skills of many practicalities, such as the transmission gold using different dielectric coefficient has been developed
Category traverse design is resistance, inductance and capacitance etc., either using transistor design be resistance and capacitance etc. or using metal as
Jumper connection utilizes the skills such as open circuit or short circuit.In actual circuit, the transmission line of one section of short length can be used within the scope of certain frequency
Imitate inductance or capacitance, therefore the present invention designs the height of impedance using the characteristic impedance of transmission line, to adjust impedance
Size, and the transmission line role of the present invention replaces conventional cabling by extended pad, can save certain layout
Space.
In the present embodiment, mating structure is only slidably matched realization by a matching element 200 and pad 100, and debugging is convenient, at
This saving, layout are not easy to be limited, and it is wide to adapt to scene multiregion.Pad 100 has the function of trace transmission line, can realize
Impedance transformation under the influence of different frequency, is matched important composition component, needs the control for having stringent on geomery,
When such as the matching element 200 that uses being inductance or capacitance, the design of pad 100 should strictly keep its comprehensive symmetry, that is, weld
The graphics shape and size of disk 100 are answered completely the same, few are being welded with ensureing that matching element 200 can smoothly match interference
Disk 100 realizes sliding, ensures that the surface tension of all solder joints of the leg of matching element 200 on pad 100 keeps balance (i.e.
Its resultant force is zero), conducive to ideal solder joint is formed, to reduce the influence to radio-frequency match precision, to reduce the distortion of signal,
Ensure the transmission of peak signal energy.
In addition, 100 configuration design of pad must be consistent with interface unit pin suction Xi Chu characterization shapes, to keep scolding tin
It can well be contacted with maximum suction tin face with pad 100, reduce interference.100 outer shape of pad can be ellipse, length
The regular shapes such as rectangular, rectangle；Pad 100 used in irregular shape matching element 200 as possible by every means be converted into phase
Similar rule shape pad 100.Worse comes to worst, considers further that and makes irregular shape.
When practice, it can be realized by a connection medium when matching element 200 is connect with pad 100, it is such as sliding
Dynamic slot etc., so that matching element 200 slides more convenient, sliding is more regular to seek, and is conducive to the controllable of radio frequency debugging
Property, accuracy and operability；
When radio frequency debugging matching, relative position that first can be by adjusting matching element 200 on the pad 100 is real
The matching of impedance value needed for existing, under such debud mode, impedance parameter influences small, and the continuity of change in impedance value is good so that
It is easier to modulate required impedance value, if success still cannot be debugged, the length of pad 100 can be adjusted, or replace not
Matching element 200 with reactance characteristic or reactance value can realize impedance matching.
Based on above-mentioned design, the Overall Structure Design of the present embodiment is simple, and layout facilitates unrestricted, has a wide range of application,
Debugging is more convenient to be easy, and can greatly be shortened the radio frequency R＆D cycle, be reduced R＆D costs.
It is further preferred that the length of the pad 100 is not more than half wavelength.Transmit matching properties be typically with
The number of wavelengths of length is related, common, and people are accustomed to number of wavelengths come the length of profile matching network cabling and connecting line, and
It is not absolute growth, so length herein is defined as number of wavelengths definition.
Parameter value of the length of pad 100 as an influence impedance matching, also should there are one specifications to define, and walk
Line is too long not necessarily to widen debugging range, increase the ease of debugging；The length of pad 100 is than existing in the present embodiment
Conventional length will be grown, and can realize the sliding function of matching element 200 on it, in addition, half wavelength length energy
It is related to the whole cycle of electromagnetic field wave, the impedance generated closer to half wavelength is more complete, can be with a matching member
Part 200 completes more complete impedance matching jointly, when the fluctuation more than half wavelength electromagnetic field is not belonging to the same period, root
According to kelvin effect, fluctuation is different, and impedance will be different, and the impedance period is influenced by period of waves, exists in practice certain
Loss, is unfavorable for the matched well of impedance, in addition, also demonstrate that this is theoretical by Smith's emulation experiment, therefore the present embodiment
The middle length for limiting the pad 100 is not more than half wavelength.It should be noted that width of this implementation for pad 100
Not excessive condition limitation, sets according to general pad specifications design demand.
The matching element 200 is inductance.
The matching element 200 or capacitance.
No matter matching element 200 is inductance or capacitance, all have the function of realizing impedance adjustment.When debugging, it is only necessary to match
Different 100 length of pad and inductance or capacitance are closed, then coordinates the opposite position for changing inductance or capacitance on pad 100
Set completion fine tuning, you can realize the perfect matching of impedance, it is simple to operate.
Preferably, the pad 100 includes the first sub- pad 110 and the second sub- pad 120, the first sub- pad 110
With the non-touching setting of both the described second sub- pads 120,200 one end of the matching element and the described first sub- pad 110
Connection, the other end are connect with the described second sub- pad 120.There are two pins for conventional capacitor and inductor component, in order to make to penetrate
Frequency mating structure is more standardized, and pad 100 is also required to more standardize, therefore it includes the first sub- pad 110 and the to design pad 100
Two sub- pads 120, two pins for being adapted to inductively or capacitively component, are respectively completed the connection of different circuits.
The length of the first sub- pad 110 is not more than half wavelength, 200 one end of the matching element and described the
One sub- pad, 110 slidable connection.First sub- pad 110, which is connected into RF signal output, can play transmission line impedance transformation
Effect.
200 other end of the matching element is slidably connected with the described second sub- pad 120, and the second sub- pad 120, which is connected into, to be penetrated
Frequency signal output end can also play the role of transmission line impedance transformation, at this point, two pins of matching element 200 are separately connected
In the first sub- pad 110, the second sub- pad 120, can synchronizing moving, replace the relative distance of matching element 200 and each self-brazing pad
When, it needs two solder joints of dismounting to be adjusted, causes the operating time to extend, and the first sub- pad 110 and the second sub- pad 120 are all
Corresponding extension is needed, is easy to increase arrangement space occupancy；
In order to improve above-mentioned problem, optionally, 200 other end of the matching element is set and is welded with second son
Disk 120 is fixedly connected, and the length requirement of the second sub- pad 120 is just lower at this time, is extended without special, but to matching element
The end pitch requirements of 200 two pins are then relatively high, need to meet that a pin is motionless, another pin disclosure satisfy that from
One end of one sub- pad 110 to the other end of the first sub- pad 110 use demand, in order to reduce the end spacing of the two pins
The central point of the second sub- pad 120 need to be arranged to 110 two endpoints of the first sub- pad to the occupancy of arrangement space in extension
Apart from equal.It should be noted that " first ", " second " are not to pad in the second sub- pad 120 and the first sub- pad 110
The limitation of performance, appearance and structure can also be arranged matching element 200 and is fixedly connected with the first sub- pad 110, with the second son
Pad 120 is slidably connected.
The first sub- pad 110 and the second sub- pad 120 are arranged in parallel.Be conducive to matching element 200 opposite the
When one sub- pad 110 and the second sub- pad 120 synchronize mobile so that installation site at two pins of the two and away from
It is more stable from equal Parameters variations orderly to advantageously reduce the physical arrangement defect interference of debugging process, acceleration Optimum Matching value
It generates, increases debugging reliability and precision, accelerate research and development, reduce R＆D costs.
Meanwhile the radio-frequency match structure of the present embodiment can be with common radio frequency matching network (such as π types and L-type matching network)
It is used in combination, when using common radio frequency matching network (such as π types and L-type matching network) ideal frequency range cannot be debugged, is not necessarily to
Again correcting cabling, entire radio frequency system can be done further frequency band match tune by debugging the radio-frequency match structure of the present embodiment
Examination increases the flexibility of same radio frequency system debugging, is conducive to the successful debugging of ideal frequency range.
The shape of the first sub- pad 110 and the second sub- pad 120 is rectangle.The bond pad shapes of rule make
The controllability higher of entire radio-frequency match structure, especially under rectangular shape.
As shown in Fig. 2, Smith when be matching element 200 being capacitance justifies test result figure, in this experiment, it is based on above-mentioned
Structure design, the length that the first sub- pad 110 and the second sub- pad 120 is arranged is 0.399 wavelength, and matching element 200 is
Capacitance size is equal to the capacitance of 5.6pf, and application scenarios are that rf frequency is 1GHz states, testing and debugging matching member in this experiment
The radio frequency that relative distance changes on the first sub- pad 110 and the second sub- pad 120 debugging of part 200, position 1 are random when starting
The position chosen, position 3 are the desired result that matching obtains after the completion.
In order not to lose the generality of result, setting matching element 200 has equally carried out Smith when being inductance and has justified test, such as
The Smith that Fig. 3 show when matching element 200 is inductance justifies test result figure, equally first randomly selects an impedance value point,
Selection is in terms of the output end of radiofrequency signal after debugging, and the length of bonding pad of connection access matching network is 0.022 wavelength, and inductance value is
4.6nh can reach the matching that impedance value is 50 Europe at this time.
In conclusion the radio-frequency match structure provided in this embodiment for being easy to debugging occupies little space, reproducibility is high, real
Good with property, the radio-frequency match for being particularly suitable for miniature device uses, while debugging and being more convenient to be easy, and debugs ideality higher, can
Greatly shorten the radio frequency R＆D cycle, reduces R＆D costs.
Embodiment 2
As shown in figure 4, design of the present embodiment based on embodiment radio-frequency match structure before, provides a kind of radio-frequency match electricity
Road, including the radio-frequency match structure for being easy to debugging described in embodiment, the first sub- pad 110 are exported with radiofrequency signal before
Hold (in radio circuit, the output port of radiofrequency signal can be emitted) connection, the second sub- pad 120 ground connection.
In detail, the RF transmit-receive circuit RF signal output of 110 one end of the first sub- pad and radio circuit connects, the
One sub- pad, 110 other end connects radio-frequency antenna, 120 integral ground line of the second sub- pad.
In the present embodiment, for the first sub- pad 110 as radiofrequency signal end, the second sub- pad 120 is used as ground terminal, sliding
With element 200, the impedance transformation that the first sub- pad 110 is influenced by Electromagnetic Wave is can be achieved with, the possibility of distorted signals is reduced,
And this radio frequency matching circuit structure design minimizes, matching and debugging is more convenient quick while at low cost, more precisely.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (10)
1. a kind of radio-frequency match structure being easy to debugging, which is characterized in that including：Pad；The pad can be opposite equipped with one
The matching element of the pad sliding.
2. a kind of radio-frequency match structure being easy to debugging according to claim 1, which is characterized in that the length of the pad
No more than half wavelength.
3. a kind of radio-frequency match structure being easy to debugging according to claim 1, which is characterized in that the matching element is
Inductance.
4. a kind of radio-frequency match structure being easy to debugging according to claim 1, which is characterized in that the matching element is
Capacitance.
5. a kind of radio-frequency match structure being easy to debugging according to claim 1, which is characterized in that the pad includes the
One sub- pad and the second sub- pad, the non-touching setting of both the first sub- pad and the second sub- pad, described
It is connect with the described first sub- pad with element one end, the other end is connect with the described second sub- pad.
6. a kind of radio-frequency match structure being easy to debugging according to claim 5, which is characterized in that the first sub- pad
Length be not more than half wavelength, described matching element one end and the described first sub- pad slidable connection.
7. a kind of radio-frequency match structure being easy to debugging according to claim 6, which is characterized in that the matching element is another
One end is fixedly connected with the described second sub- pad.
8. a kind of radio-frequency match structure being easy to debugging according to claim 5, which is characterized in that the first sub- pad
With the described second sub- pads parallel setting.
9. a kind of radio-frequency match structure being easy to debugging according to claim 8, which is characterized in that the matching element one
End and the described first sub- pad slidable connection, the other end and the described second sub- pad slidable connection.
10. a kind of radio frequency matching circuit, which is characterized in that described a kind of being easy to penetrating for debugging including claim 5-9 is any
Frequency mating structure, the first sub- pad are connect with RF signal output, the second sub- pad ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810093983.6A CN108282169A (en) | 2018-01-31 | 2018-01-31 | A kind of radio-frequency match structure and radio frequency matching circuit being easy to debugging |
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| CN201810093983.6A CN108282169A (en) | 2018-01-31 | 2018-01-31 | A kind of radio-frequency match structure and radio frequency matching circuit being easy to debugging |
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| US20040190217A1 (en) * | 2003-03-28 | 2004-09-30 | Stokes Robert B. | Mems variable inductor and capacitor |
| CN1788294A (en) * | 2003-03-13 | 2006-06-14 | 关卡系统股份有限公司 | Resonant frequency tag and method for controlling tag frequency |
| CN105790787A (en) * | 2016-02-25 | 2016-07-20 | 广东欧珀移动通信有限公司 | Design method of impedance matching circuit and mobile terminal |
| CN206412485U (en) * | 2016-11-02 | 2017-08-15 | 上海捷士太通讯技术有限公司 | A kind of antenna for carrying match circuit |
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2018
- 2018-01-31 CN CN201810093983.6A patent/CN108282169A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004235502A (en) * | 2003-01-31 | 2004-08-19 | Hitachi Kokusai Electric Inc | Land shape for mounting chip component |
| CN1788294A (en) * | 2003-03-13 | 2006-06-14 | 关卡系统股份有限公司 | Resonant frequency tag and method for controlling tag frequency |
| US20040190217A1 (en) * | 2003-03-28 | 2004-09-30 | Stokes Robert B. | Mems variable inductor and capacitor |
| CN105790787A (en) * | 2016-02-25 | 2016-07-20 | 广东欧珀移动通信有限公司 | Design method of impedance matching circuit and mobile terminal |
| CN206412485U (en) * | 2016-11-02 | 2017-08-15 | 上海捷士太通讯技术有限公司 | A kind of antenna for carrying match circuit |
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Application publication date: 20180713 |