CN106159450A - Loop aerial and electronic equipment - Google Patents
Loop aerial and electronic equipment Download PDFInfo
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- CN106159450A CN106159450A CN201510134817.2A CN201510134817A CN106159450A CN 106159450 A CN106159450 A CN 106159450A CN 201510134817 A CN201510134817 A CN 201510134817A CN 106159450 A CN106159450 A CN 106159450A
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- loop aerial
- resonance frequency
- parallel resonance
- frequency
- electric capacity
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Abstract
The present invention provides a kind of loop aerial and includes the electronic equipment of this loop aerial, also is able to effectively increase the bandwidth of operation of loop aerial in the electronic equipment of limited space.Described loop aerial includes: ring radiation body, and its one end is feed point, its other end ground connection；Match circuit, configuration carries out impedance matching；And parallel resonance electric capacity, its one end is connected to described ring radiation body, its other end ground connection, and configuration reduces the parallel resonance frequency of described loop aerial.
Description
Technical field
The present invention relates to loop aerial and include the electronic equipment of this loop aerial.
Background technology
In the electronic equipment of such as mobile phone etc., it is provided with antenna to send and receive.Due to annular
The radiation efficiency of antenna is high, be prone to configuration and receive and be widely applied.Broadband along with radio band,
Loop aerial needs to cover such as 1710～2690MHz.
In the prior art, by match circuit is improved, more suitably carry out impedance matching,
Thus reach the effect of the bandwidth of operation of expansion hula antenna.But, increase work by match circuit
The effect of bandwidth is very limited, and is difficult to be increased by match circuit in the electronic equipment of limited space
Add working band.
Summary of the invention
The present invention completes in view of the above problems, its object is to provide a kind of loop aerial and include this ring
The electronic equipment of shape antenna, also is able to effectively increase loop aerial in the electronic equipment of limited space
Bandwidth of operation.
According to an aspect of the present invention, it is provided that a kind of loop aerial.Described loop aerial includes: annular
Radiant body, its one end is feed point, its other end ground connection；Match circuit, configuration carries out impedance matching；
And parallel resonance electric capacity, its one end is connected to described ring radiation body, its other end ground connection, and configuration comes
Reduce the parallel resonance frequency of described ring radiation body.
According to a further aspect in the invention, it is provided that a kind of electronic equipment.Described electronic equipment includes: annular
Antenna；Wireless signal processing component, is connected with the feed point of described loop aerial, and configuration comes via described ring
Shape antenna sends and receives wireless signal, and wherein, described loop aerial includes: ring radiation body, one
End is feed point, its other end ground connection；Match circuit, configuration carries out impedance matching；And parallel resonance
Electric capacity, its one end is connected to described ring radiation body, its other end ground connection, and configuration reduces described annular
The parallel resonance frequency of radiant body.
Loop aerial according to the present invention and electronic equipment, by connecting parallel resonance in ring radiation body
Electric capacity, thus reduce parallel resonance frequency, it is possible to realize effectively in the electronic equipment of limited space
Ground increases the effect of the bandwidth of operation of loop aerial.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of the electronic equipment representing embodiments of the present invention.
Fig. 2 is the functional block diagram of the loop aerial 1 in the electronic equipment representing embodiments of the present invention.
Fig. 3 is the equivalent circuit diagram representing loop aerial of the prior art.
Fig. 4 is the equivalent circuit diagram of the loop aerial 1 representing embodiments of the present invention.
Fig. 5 is the structure chart of the loop aerial 1 illustrating embodiments of the present invention.
Fig. 6 is bandwidth of operation and the annular of embodiments of the present invention of the loop aerial representing prior art
The spectrogram of the bandwidth of operation of antenna.
Detailed description of the invention
Below, it is explained with reference to embodiments of the present invention.Description referring to the drawings is provided,
To help the understanding of the example embodiment to the present invention limited by appended claims and their equivalents.Its
The various details understood including help, but they can only be counted as exemplary.Therefore, ability
Field technique personnel are not it will be recognized that can make various changes and modifications embodiment described herein, and not
Depart from the scope of the present invention and spirit.And, in order to make description more clear succinct, by omission to this
Field well-known functions and the detailed description of structure.
The electronic equipment of embodiments of the present invention is described with reference to Fig. 1.As it is shown in figure 1, electronic equipment
Including loop aerial 1 and wireless signal processing component 2.Wherein, the electricity of electronic equipment for example, mobile phone etc.
Subset, is transmitted wireless signal and receives, thus realizes the function specified.
Wireless signal processing component 2 is connected with the feed point of loop aerial 1, and configuration comes via loop aerial 1
Send and receive wireless signal.Specifically, the company between wireless signal processing component 2 and loop aerial 1
Contact is feed point, and wireless signal to be sent is modulated waiting after processing by wireless signal processing component 2,
Loop aerial is sent to by feed point.Additionally, wireless signal processing component 2 is transmitted by ring by feed point
Shape antenna 1 receive wireless signal, and the wireless signal being sent to is demodulated wait process.
Loop aerial 1 configuration is launched wireless signal in working band and receives wireless signal.Reference
Fig. 2 describes the loop aerial 1 of embodiments of the present invention in detail.
Fig. 2 is the functional block diagram of the loop aerial 1 in the electronic equipment representing embodiments of the present invention.
As in figure 2 it is shown, loop aerial 1 includes ring radiation body 11, match circuit 12 and antiresonant circuit
13。
One end of ring radiation body 11 is feed point, and the other end of ring radiation body 11 is ground connection.Example
As, when loop aerial 1 is configured in electronic equipment, feed point is passed through with upper in one end of ring radiation body 11
The wireless signal processing component 2 stated connects.
Match circuit 12 configuration carries out impedance matching.Such as, match circuit 12 is connected to above-mentioned feedback
Point, but it is not limited to this, it is also possible to it is connected to the intermediate point of ring radiation body, as long as being capable of impedance
The function of coupling.Impedance matching is carried out such that it is able to improve loop aerial by match circuit 12
Efficiency when efficiency during 1 transmission wireless signal and reception wireless signal.
Above-mentioned ring radiation body 11 and match circuit 12 are identical with prior art.Fig. 3 is existing
The equivalent circuit diagram of the loop aerial including ring radiation body and match circuit of technology.
In figure 3, ring radiation body 11 can be equivalent to equivalent series resistance 114, equivalent parallel electricity
Resistance 111, equivalent parallel inductance 112, equivalent parallel electric capacity 113.Wherein, in equivalent series resistance 114
In, equivalent series resistance, equivalent series inductance and equivalent series capacitance are connected in series.
As it is shown on figure 3, match circuit 12 is connected to one end and the ground connection of equivalent series resistance 114.Equivalence
Parallel resistance 111, equivalent parallel inductance 112, equivalent parallel electric capacity 113 are connected respectively to equivalent series resistance
The other end of anti-114 and ground connection.
Fig. 6 is bandwidth of operation and the annular of embodiments of the present invention of the loop aerial representing prior art
The spectrogram of the bandwidth of operation of antenna.Wherein, the solid line in Fig. 6 represents that the loop aerial of prior art exists
Return loss S11 under each frequency.Such as, in the return loss frequency less than-6dB, annular sky
Line can work.So, in figure 6, the return loss frequency less than-6dB constitutes the work of loop aerial
Make frequency band.
According to Fig. 6, the working band of loop aerial configures centered by resonant frequency, specifically exists
Fig. 6 is configured with loop aerial centered by series resonance frequency f0, f2, f3 and parallel resonance frequency f1
Working band.
Wherein, in the loop aerial of prior art, series resonance frequency (f0 in such as Fig. 6, f2,
F3) determined by equivalent series resistance 114 (specifically by equivalent series inductance, equivalent series capacitance), in parallel
Resonant frequency (f1 in such as Fig. 6) is common by equivalent parallel inductance 112, equivalent parallel electric capacity 113
Determine.In the prior art, when being increased the bandwidth of operation of loop aerial by impedance matching, with series connection
As a example by resonant frequency f0, in the frequency around series resonance frequency f0, make this by impedance matching
Return loss under frequency is less than-6dB.Thereby, it is possible to increase the work centered by series resonance frequency f0
Make the width of frequency band, thus increase the bandwidth of operation of loop aerial.But, the equivalence resistance of ring radiation body
Resist along with the increase of the difference with resonant frequency is increased dramatically, thus in the difference with resonant frequency more than one
The frequency of definite value cannot be carried out impedance matching, cause return loss cannot meet predetermined condition.In other words
Saying, match circuit 12 cannot change resonant frequency, result in the effect of the working band increasing loop aerial
Limited.
Additionally, in the prior art, it is also considered that change resonance frequency by the structure changing ring radiation body
Rate, thus increase the bandwidth of operation of loop aerial.Such as, parallel resonance frequency f1 is reduced, it is thus possible to
Enough increase the bandwidth of operation (such as, the width of the return loss frequency less than-6dB) of loop aerial.For
Reduction parallel resonance frequency f1, such as, need the width of ring radiation body strengthens or makes annular spoke
Beam is arranged near ground connection.But, it is difficult in the electronic equipment of limited space ring radiation body
Structure carries out above-mentioned change.
Return to Fig. 2, the loop aerial 1 of embodiments of the present invention also includes parallel resonance electric capacity
13.One end of parallel resonance electric capacity 13 is connected to ring radiation body 11, its other end ground connection, this parallel connection
Resonant capacitance 13 configuration reduces the parallel resonance frequency of loop aerial 1.
When also including parallel resonance electric capacity 13 in the loop aerial 1 of embodiments of the present invention, its equivalence
Circuit is as shown in Figure 4.In the diagram, equivalent series resistance 114, equivalent parallel resistance 111, equivalence are also
Connection inductance 112, equivalent parallel electric capacity 113 and match circuit 12 are with the most identical, the most not
Carry out the explanation repeated.
In the diagram, one end of the equivalent capacity 115 of parallel resonance electric capacity 13 is connected to equivalent series resistance
The other end of 114, the other end of this equivalent capacity 115 is connected to ground connection.That is, the embodiment party of the present invention
In formula, the equivalent parallel resistance 111 of the equivalent capacity of parallel resonance electric capacity 13 115 and ring radiation body 11,
Equivalent parallel inductance 112 and equivalent parallel electric capacity 113 are connected in parallel.Thus, the embodiment party of the present invention
In the loop aerial 1 of formula, parallel resonance frequency is humorous by equivalent parallel inductance, equivalent parallel electric capacity and parallel connection
The equivalent capacity 115 of electric capacity 13 of shaking together decides on, and thus includes parallel resonance electric capacity at loop aerial 1
After 13, the parallel resonance frequency of loop aerial 1 reduces.
With reference to Fig. 6, if parallel resonance frequency f1 reduces, then with parallel resonance frequency f1, series resonance frequency
Frequency band centered by the frequency band of rate f2, that return loss is less than-6dB increases, thus the work of loop aerial 1
Make bandwidth to increase.
Fig. 5 is the structure chart of the loop aerial 1 illustrating embodiments of the present invention.As it is shown in figure 5, ring
Shape radiant body 11 is positioned at the headroom of the lower section of pcb board and the top position of USB interface.Additionally, it is in parallel
Resonant capacitance 13 is connected to the junction point of ring radiation body 11 and the other end (ground connection of ring radiation body 11
Point) between distance be expressed as D.
Wherein, along with the equivalent capacity 115 of parallel resonance electric capacity 13 increases, the reduction of parallel resonance frequency
Amplitude bigger (effect increasing bandwidth of operation becomes apparent from), but the input impedance in terms of feed point can be caused
Increasing, thus in the frequency between parallel resonance frequency and series resonance frequency, match circuit 12 cannot enter
Row impedance matching.On the contrary, when the equivalent capacity 115 of parallel resonance electric capacity 13 is too small, input impedance
Increase inconspicuous, but the effect being to increase bandwidth of operation the most correspondingly reduces.Accordingly, it would be desirable to reasonably set
Put the capacitance of equivalent capacity 115.
Such as, the loop aerial in embodiments of the present invention needs to cover 1710～2690MHz, therefore
Parallel resonance frequency is reduced near 1710MHz.Therefore, the equivalence of parallel resonance electric capacity 13 is set
The capacitance of electric capacity 115 so that loop aerial 1 can be at working band (such as 1710～2690MHz)
It is operated (that is, in working band, the return loss of loop aerial 1 is less than-6dB).
Specifically, the capacitance of the equivalent capacity 115 of parallel resonance electric capacity 13 is according to the work of loop aerial 1
Set as frequency band.Wherein, the capacitance of equivalent capacity 115 and parallel resonance electric capacity 13 capacitance,
And such as distance D shown in Fig. 5 (parallel resonance electric capacity 13 is connected to the connection of ring radiation body 11
Point and the distance between the earth point of ring radiation body 11) relevant.
Therefore, one end of parallel resonance electric capacity 13 and the link position of ring radiation body, with loop aerial
Working band is correlated with.Such as, in the case of parallel resonance frequency is reduced near 1710MHz, excellent
Electing as, parallel resonance electric capacity 13 is connected to the junction point of ring radiation body 11 and connecing of ring radiation body 11
Distance between place is set to 10mm～20mm.In the case of distance D is more than 20mm, and
The capacitance of the equivalent capacity 115 of connection resonant capacitance 13 drastically raises, and is unfavorable for accurately setting parallel connection humorous
Vibration frequency.On the contrary, in the case of distance D is less than 10mm, in order to reduce parallel resonance frequency, and
The capacitance of connection resonant capacitance 13 is sufficiently large, it is difficult to arrange in parallel humorous in the electronic equipment of limited space
Shake electric capacity.
Additionally, as it has been described above, in the case of the reduction amplitude of parallel resonance frequency is excessive, due to equivalence
Electric capacity 115 increase causes the input impedance in terms of feed point to increase, and therefore causes at parallel resonance frequency and string
Frequency between connection resonant frequency cannot be carried out impedance matching.
Therefore, in the loop aerial 1 of embodiments of the present invention, it is to avoid the reduction of parallel resonance frequency
Amplitude is excessive, thus cause the working band of loop aerial 1 discontinuous (parallel resonance frequency with connect
In frequency between resonant frequency, return loss is not less than-6dB).
Thus, after distance D determined by above-mentioned method, set parallel resonance electric capacity 13
Capacitance so that in the frequency band between the parallel resonance frequency and the first series resonance frequency of loop aerial,
The return loss of loop aerial 1 meets rated condition.Specifically, the electric capacity of parallel resonance electric capacity 13 is set
Value (such as 1.2pF) so that in the parallel resonance frequency (such as the f1 ' of Fig. 6) and first of loop aerial 1
In frequency band between series resonance frequency (such as the f2 of Fig. 6), the return loss of loop aerial 1 is less than-6dB.
Wherein, with reference to Fig. 6, parallel resonance frequency f1 of the loop aerial 1 of embodiments of the present invention ' with connect
Resonant frequency f2 (relative to other series resonance frequency) is close, and series resonance frequency f2 is more than
Parallel resonance frequency f1 '.
Such as, illustrate embodiments of the present invention increase the bandwidth of operation of loop aerial 1 with reference to Fig. 6
Effect.Fig. 6 is bandwidth of operation and the embodiments of the present invention of the loop aerial representing prior art
The spectrogram of the bandwidth of operation of loop aerial.As it has been described above, the solid line in Fig. 6 represents the ring of prior art
Shape antenna return loss S11 at respective frequencies.As shown in Figure 6, the working band of loop aerial with
Configure centered by resonant frequency, humorous with series resonance frequency f0, f2, f3 and parallel connection the most in figure 6
The working band of loop aerial it is configured with centered by vibration frequency f1 (2.05GHz).
Correspondingly, the dotted line in Fig. 6 represents that the loop aerial 1 of embodiments of the present invention is in each frequency
Under return loss S11.As shown in Figure 6, by reduce parallel resonance frequency, parallel resonance frequency from
F1 is reduced to f1 ' (1.75GHz), and the working band of loop aerial 1 is with series resonance frequency f0, f2, f3
With parallel resonance frequency f1 ' centered by configure.Additionally, as shown in Figure 6, in parallel resonance frequency f1 ' with
In frequency band between f2, return loss is again smaller than-6dB, therefore, it is possible at continuous print 1710～2690MHz
In be operated.
Furthermore it is preferred that be, the parallel resonance electric capacity 13 of embodiments of the present invention is made up of variable condenser.
Thereby, it is possible to regulate the parallel resonance frequency of loop aerial 1 more neatly, and then can be by suitably
Ground carries out impedance matching so that the return loss in working band is lower.
Additionally, as it has been described above, in the case of the reduction amplitude of parallel resonance frequency is excessive, due to equivalence
Electric capacity 115 increase causes the input impedance in terms of feed point to increase, and therefore causes at parallel resonance frequency and string
Frequency between connection resonant frequency cannot be carried out impedance matching.Therefore, in embodiments of the present invention
In loop aerial 1, it is to avoid the reduction amplitude of parallel resonance frequency is excessive, thus causes loop aerial 1
Working band is discontinuous.
Thus, the maximum capacitor value of variable condenser constituting parallel resonance electric capacity 13 is become by value, can
When variodenser is set as maximum capacitor value, in parallel resonance frequency and first series resonance of loop aerial
In frequency band between frequency, the return loss of loop aerial 1 meets rated condition.Specifically, can power transformation
When container is set as maximum capacitor value (such as 1.2pF) so that in the parallel resonance frequency of loop aerial 1
In frequency band between (such as f1 ") and the first series resonance frequency (such as the f2 of Fig. 6), loop aerial
The return loss of 1 is less than-6dB.Additionally, increase work strip to ensure to reduce parallel resonance frequency
Wide effect, for example, it can be set to the position of minimum capacitance of variable condenser (0.3pF).Equally, the present invention
Parallel resonance frequency f1 of loop aerial 1 of embodiment " with series resonance frequency f2 (relative to it
His series resonance frequency) close, and series resonance frequency f2 is more than parallel resonance frequency f1 ".
Additionally, when being made up of parallel resonance electric capacity variable condenser, be preferably, electronic equipment also includes
Control parts.These control parts, according to the frequency of described wireless signal, control the electricity of described variable condenser
Capacitance.Thereby, it is possible to according to the frequency of wireless signal, automatically adjust the capacitance of variable condenser,
Thus improve the efficiency (such as, reducing return loss further) of loop aerial 1.
Additionally, in the above description, the working band of loop aerial 1, the capacitance of parallel resonance electric capacity,
The various numerical value of distance D and resonant frequency are only to illustrate, and it will be apparent to those skilled in the art that permissible
Setting and change above-mentioned numerical value as suitably desired, the span of above-mentioned numerical value is not limited.
Each embodiment of the present invention described in detail above.But, those skilled in the art should
Understand, without departing from the principles and spirit of the present invention, can these embodiments be carried out various
Amendment, combination or sub-portfolio, and such amendment should fall within the scope of the present invention.
Claims (10)
1. a loop aerial, including:
Ring radiation body, its one end is feed point, its other end ground connection；
Match circuit, configuration carries out impedance matching；And
Parallel resonance electric capacity, its one end is connected to described ring radiation body, its other end ground connection, and configuration comes
Reduce the parallel resonance frequency of described loop aerial.
2. loop aerial as claimed in claim 1, wherein,
One end of described parallel resonance electric capacity and the link position of described ring radiation body, with described annular sky
The working band of line is correlated with.
3. loop aerial as claimed in claim 2, wherein,
The capacitance of described parallel resonance electric capacity is configured to, in the parallel resonance frequency of described loop aerial
And in the frequency band between the first series resonance frequency, the return loss of described loop aerial meets rated condition,
Described first series resonance frequency is more than described parallel resonance frequency, and with other series resonance
Frequency is compared near parallel resonance frequency.
4. loop aerial as claimed in claim 1 or 2, wherein,
Described parallel resonance electric capacity is made up of variable condenser.
5. loop aerial as claimed in claim 4, wherein,
When described variable condenser is set as maximum capacitor value, at the parallel resonance frequency of described loop aerial
In frequency band between rate and the first series resonance frequency, the return loss of described loop aerial meets regulation bar
Part,
Described first series resonance frequency is more than described parallel resonance frequency, and with other series resonance
Frequency is compared near parallel resonance frequency.
6. an electronic equipment, including:
Loop aerial；
Wireless signal processing component, is connected with the feed point of described loop aerial, and configuration comes via described annular
Antenna sends and receives wireless signal,
Described loop aerial, including:
Ring radiation body, its one end is feed point, its other end ground connection；
Match circuit, configuration carries out impedance matching；And
Parallel resonance electric capacity, its one end is connected to described ring radiation body, its other end ground connection, and configuration comes
Reduce the parallel resonance frequency of described loop aerial.
7. electronic equipment as claimed in claim 6, wherein,
One end of described parallel resonance electric capacity and the link position of described ring radiation body, with described annular sky
The working band of line is correlated with.
Electronic equipment the most as claimed in claims 6 or 7, wherein,
Described parallel resonance electric capacity is made up of variable condenser.
9. electronic equipment as claimed in claim 8, wherein,
When described variable condenser is set as maximum capacitor value, at the parallel resonance frequency of described loop aerial
In frequency band between rate and the first series resonance frequency, the return loss of described loop aerial meets regulation bar
Part,
Described first series resonance frequency is more than described parallel resonance frequency, and with other series resonance
Frequency is compared near parallel resonance frequency.
10. electronic equipment as claimed in claim 8, also includes:
Controlling parts, configuration carrys out the frequency according to described wireless signal, controls the electricity of described variable condenser
Capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510134817.2A CN106159450A (en) | 2015-03-26 | 2015-03-26 | Loop aerial and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510134817.2A CN106159450A (en) | 2015-03-26 | 2015-03-26 | Loop aerial and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106159450A true CN106159450A (en) | 2016-11-23 |
Family
ID=57340012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510134817.2A Pending CN106159450A (en) | 2015-03-26 | 2015-03-26 | Loop aerial and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106159450A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785434A (en) * | 2017-01-22 | 2017-05-31 | 曲龙跃 | A kind of compact dual-frequency loop aerial |
| CN107611567A (en) * | 2017-07-17 | 2018-01-19 | 深圳天珑无线科技有限公司 | Loop aerial and the smart machine for possessing the loop aerial |
| EP3920325A1 (en) * | 2020-06-05 | 2021-12-08 | Continental Automotive GmbH | Antenna arrangement for electronic vehicle key |
| CN117335154A (en) * | 2023-09-28 | 2024-01-02 | 中国科学院地质与地球物理研究所 | Multi-frequency resonance device and method for electromagnetic wave antenna |
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Application publication date: 20161123 |
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