CN104184435A - Antenna device and communication device - Google Patents
Antenna device and communication device Download PDFInfo
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- CN104184435A CN104184435A CN201410216480.5A CN201410216480A CN104184435A CN 104184435 A CN104184435 A CN 104184435A CN 201410216480 A CN201410216480 A CN 201410216480A CN 104184435 A CN104184435 A CN 104184435A
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Abstract
The present invention relates to an antenna device and a communication device. The antenna device comprises an RFIC (10) which carries out switching on inner resistance of a Tx terminal in a card mode and a reader-writer mode; an antenna circuit (12) connected to the Tx terminal; a variable capacitor element (C22), the capacitor of which changes when a control voltage is applied on the variable capacitor element (C22) so that the resonant frequency of the antenna circuit (12) changes; a matching circuit (11) which is disposed between the Tx terminal and the antenna circuit (12) and carries out impedance matching; and a rectification circuit (13) which applies a control voltage corresponding to the voltage generated on the Tx terminal on the variable capacitor element (C22). The rectification circuit (13) outputs a control voltage which is applied on the variable capacitor element (C22) to set the resonant frequency of the antenna circuit (12) as a resonant frequency (13.56 MHz) corresponding to the reader-writer mode, if a signal is outputted by the Tx terminal.
Description
Technical field
The present invention relates to the antenna assembly of the resonance frequency variation that utilizes variable-capacitance element to make antenna circuit and possess the communicator of this antenna assembly.
Background technology
In recent years, the electronic equipment such as mobile phone has the wireless near field communication functions such as NFC (Near Field Communication: near-field communication).This electronic equipment has following two kinds of patterns conventionally: according to the request of the read-and-write device from the communication object pattern of transceiving data (hereinafter referred to as card pattern) passively; And move with active mode, itself becomes read-and-write device, sends on one's own initiative the pattern (hereinafter referred to as reader/writer mode) of data to communication object.
In the situation that thering is this two kinds of patterns, for realizing the miniaturization of electronic equipment, conventionally in an aerial coil, realize two kinds of patterns.In this case, the control IC being connected with aerial coil switches the switching controls of the internal driving that sends terminal (Tx terminal) according to pattern.For example, control IC under card pattern, Tx terminal is set to open circuit, under reader/writer mode by the Tx short-circuit of terminals.Therefore, different with the circuit impedance that is connected to aerial coil under reader/writer mode in card pattern, thus cannot divide into the same resonance frequency of phasing in each pattern.
In patent documentation 1, disclose following invention, that is: variable-capacitance element has been connected with aerial coil, utilized controller to change the capacitance of variable-capacitance element, thereby adjusted the resonance frequency of aerial coil.According to this patent documentation 1, even under above-mentioned different pattern, also can set identical resonance frequency.
Prior art document
Patent documentation
Patent documentation 1: the special table of Japan Patent 2009-543442 communique
Summary of the invention
Invent technical problem to be solved
But, in patent documentation 1, need to be provided for the controller of the capacitance that changes variable-capacitance element, also need this controller that control program is installed.Therefore, in patent documentation 1, the installation of controller need to expend time in energy and cost.
Therefore, the object of the present invention is to provide a kind of energy and cost and can prevent the antenna assembly of deterioration in communication characteristics and possess the communicator of this antenna assembly of not expending time in.
The technical scheme that technical solution problem adopts
Antenna assembly involved in the present invention is characterised in that, comprise: impedance commutation circuit, this impedance commutation circuit has the input and output terminal of input/output signal, from the input pattern of described input and output terminal input signal with from the output mode of described input and output terminal output signal, the internal driving of described input and output terminal is switched; Antenna circuit, this antenna circuit is connected to described input and output terminal; Variable-capacitance element, this variable-capacitance element its electric capacity in the time being applied with control voltage can change, thereby the resonance frequency of described antenna circuit is changed; Match circuit, this match circuit is connected between described input and output terminal and described antenna circuit, to carrying out impedance matching between described input and output terminal and described antenna circuit; And control voltage applying circuit, this control voltage applying circuit by with described input and output terminal on the voltage that produces control accordingly voltage and be applied on described variable-capacitance element, from described input and output terminal output signal in the situation that, for the resonance frequency of described antenna circuit is made as to the resonance frequency corresponding with described output mode, described control voltage applying circuit output is applied to the control voltage of described variable-capacitance element.
Under output mode, can change by increasing match circuit the resonance frequency of antenna circuit, but according to the above results, by the resonance frequency of antenna circuit is made as to the resonance frequency corresponding with output mode, under any pattern of input pattern and output mode, can communicate efficiently.In addition the control voltage being applied on the variable-capacitance element of the resonance frequency for adjusting antenna circuit, is to generate according to the voltage generating on the input and output terminal of impedance commutation circuit.Therefore, apply without being provided for the controller of controlling voltage, form thereby saved the time and efforts that circuit will expend.
Preferred described control voltage applying circuit is the rectification circuit that the voltage to producing on described input and output terminal carries out rectification.
According to this structure, can control by simple circuit the capacitance of variable-capacitance element.
Invention effect
According to the present invention, energy and the cost that need to expend like this without the controller that the capacitance variations of controlling variable-capacitance element is installed, under any pattern of input pattern and output mode, all can communicate efficiently.
Brief description of the drawings
Fig. 1 is the circuit diagram of the related antenna assembly of execution mode 1.
Fig. 2 is the circuit diagram of variable-capacitance element.
Fig. 3 is the figure that represents the frequency characteristic of the magnetic field intensity under reader/writer mode and card pattern.
Fig. 4 is the figure that represents the structure of the enclosure interior of the radio communication device of the related antenna assembly of application implementation mode 1.
Fig. 5 is the circuit diagram of the related antenna assembly of execution mode 2.
Fig. 6 is the circuit diagram of the related antenna assembly of execution mode 3.
Embodiment
(execution mode 1)
Fig. 1 is the circuit diagram of the related antenna assembly of execution mode 1.The following antenna assembly that will illustrate 1 is an example of NFC module, under card pattern (input pattern involved in the present invention) and these two kinds of patterns of reader/writer mode (output mode involved in the present invention), works.Card pattern refers to that antenna assembly 1 carries out work with passive mode, receives data from the read-and-write device of communication object, and by accepting to send from the electric power of communication object the pattern of data.Reader/writer mode refers to that antenna assembly 1 carries out work with active mode, and itself becomes read-and-write device, sends data to communication object, and receives the pattern of data from communication object.
Antenna assembly 1 has RFIC10.RFIC10 is the integrated circuit of processing high frequency (RF) signal.It is Tx1, Tx2 terminal that RFIC10 has the terminal of transmission, and Tx1, Tx2 terminal are connected with antenna circuit 12 via match circuit 11.RFIC10 is equivalent to impedance commutation circuit involved in the present invention, and Tx1, Tx2 terminal are equivalent to input and output terminal involved in the present invention.
Antenna circuit 12 is the resonant circuits with coil antenna 12A, capacitor C21 and variable-capacitance element C22.Variable-capacitance element C22 is the capacity cell of determining capacitance according to control voltage (bias voltage), and the resonance frequency of antenna circuit 12 is set as to assigned frequency.The antenna of aerial coil 12A and communication object carries out electromagnetic field couples and carries out the transmitting-receiving for short-range communication.For example, in NFC communication, utilize the HF band that centre frequency is 13.56MHz, the resonance frequency of antenna circuit 12 is set as to 13.56MHz.
In addition, in the situation that can utilizing variable-capacitance element C22 and aerial coil 12A to adjust frequency, antenna circuit 12 also can not have capacitor C21.
Fig. 2 is the circuit diagram of variable-capacitance element C22.Variable-capacitance element C22 has port P11, the P12 of input and output RF signal; Apply the port one 3 of controlling voltage; And be connected to the port P14 of ground connection.In addition, variable-capacitance element C22 has the capacity cell C2a～C2f and the resistive element R11～R19 that are connected to port P11-P12.
Capacity cell C2a～C2f sandwiches strong dielectric film and the ferro-electric materials capacitor that obtains between relative electrode.The amount of polarization of strong dielectric film can change according to the intensity of applied electric field, thereby the dielectric constant of observing can change, and therefore utilizes control voltage can set capacitance.
The resistance value of resistive element R11～R19 equates.These resistive elements R11～R19 is in applying control voltage to capacity cell C2a～C2f, the RF signal that suppresses to be applied between port P11-P12 leaks to port P13, P14.
Match circuit 11 has inductor L11, the L12 and capacitor C11, the C12 that are connected to respectively Tx1, Tx2 terminal and form EMC filter.And, match circuit 11 also have be connected to EMC filter, as capacitor C13, the C14 of the impedance matching of RFIC10 and antenna circuit 12 element.In the situation that antenna assembly 1 is reader/writer mode, the EMC filter of match circuit 11 is removed the high order harmonic component of the signal sending from antenna circuit 12.Be set as 13.56MHz in the resonance frequency of antenna circuit, the cut-off frequency of this EMC filter is for example set as near 16MHz.
The Tx1 terminal of RFIC10 is connected with rectification circuit 13.This rectification circuit 13 is equivalent to control voltage applying circuit involved in the present invention.Rectification circuit 13 comprises diode D1, capacitor C3 and resistance R 1.Rectification circuit 13 carries out rectification to the voltage producing on the Tx1 terminal of RFIC10, and is applied on the port P13 of variable-capacitance element C22 as controlling voltage.
The variable-capacitance element C22 that output is controlled the rectification circuit 13 of voltage and applied this control voltage is in the situation that RFIC10 is reader/writer mode, in order the resonance frequency of antenna circuit 12 to be made as to 13.56MHz, to be configured to the capacitance variation that makes variable-capacitance element C22.Therefore, without being provided in addition applying the controller of controlling voltage and change the capacitance of variable-capacitance element C22.In addition, due to RFIC10 have control voltage apply control function, therefore also without control program is installed in RFIC10.Thus, can in the situation that not expending time in energy and cost, apply control voltage to variable-capacitance element C22, and capacitance is changed.
In addition, it is Rx terminal that RFIC10 has the terminal of reception, and this Rx terminal is connected with antenna circuit 12 via the series circuit of resistance R 2 and capacitor C4.RFIC10, according to the high level/low level voltage that inputs to Rx terminal, carrys out the received data message of reading antenna circuit 12.
And RFIC10 also has the Tb terminal of output direct current biasing, this Tb terminal is connected with resistance R 3 with capacitor C5.Due to Tb terminal output direct current biasing, therefore this direct current biasing is added on the voltage that inputs to Rx terminal, thereby can relatively easily read the signal processing the RFIC10 of the data message receiving from antenna circuit 12.In addition, by resistance R 3 is connected with capacitor C4, utilizes capacitor C4 to carry out every directly DC offset voltage, thereby can prevent that antenna circuit 12 sides are subject to the impact of direct current biasing.
In the antenna assembly 1 with said structure, RFIC10, under reader/writer mode and card pattern, by making open circuit or short circuit between Tx1-Tx2 terminal, switches the hand-off process of the internal driving between Tx1-Tx2 terminal.Particularly, in the time that antenna assembly 1 is worked under reader/writer mode, RFIC10 will be made as short circuit between Tx1-Tx2 terminal, from each Tx1, Tx2 terminal output high frequency power.On the other hand, in the time that antenna assembly 1 is worked under card pattern, RFIC10 will be made as open circuit between Tx1-Tx2 terminal, in other words, between Tx1-Tx2 terminal, connects load, and carries out load-modulate.
Fig. 3 is the figure that represents the frequency characteristic of the magnetic field intensity under reader/writer mode and card pattern.
In Fig. 3, represent the frequency characteristic of the magnetic field intensity under card pattern with the characteristic shown in chain-dotted line.As mentioned above, match circuit 11 has EMC filter.This EMC filter configuration is to remove the high order harmonic component of 16MHz.Therefore,, under card pattern, the resonance frequency of antenna assembly 1 is the resonance frequency f1 (13.56MHz) of antenna circuit 12 and the cut-off frequency f2 (16MHz) of EMC filter.
In Fig. 3, represent the frequency characteristic of the magnetic field intensity under reader/writer mode with the characteristic shown in solid line.In addition, in Fig. 3, characteristic shown in broken lines is the frequency characteristic of the magnetic field intensity under the reader/writer mode while supposing rectification circuit 13 not to be set.Be removal high order harmonic component by the EMC filter configuration of match circuit 11.Therefore,, under reader/writer mode, this EMC filter can be subject to the impact of the resonance frequency f1 of antenna circuit 12.Consequently, under reader/writer mode, as shown in the dotted line of Fig. 3, the resonance frequency of antenna assembly 1 is f0 (14.7MHz), has departed from the signal of communication frequency band centered by 13.56MHz under reader/writer mode, and therefore communication characteristic declines.And in the present invention, change the capacitance of variable-capacitance element C22 by rectification circuit 13 is set, as shown in the solid line of Fig. 3, by the resonance frequency adjustment (movement) of antenna assembly 1 to f1 (13.56MHz).
As mentioned above, under reader/writer mode and card pattern, all can make the resonance frequency of antenna assembly 1 become the resonance frequency f1 (13.56MHz) of antenna circuit 12, therefore can communicate efficiently.In addition, because the control voltage on the variable-capacitance element C22 being applied to for adjusting resonance frequency is that voltage to producing on the Tx1 terminal of RFIC10 carries out obtaining after rectification, therefore without being provided for applying the controller of controlling voltage.
In addition, in the present embodiment, make the resonance frequency of the antenna assembly 1 under reader/writer mode and the resonance frequency f1 (13.56MHz) of antenna circuit 12 consistent, but also needn't be in full accord, as long as not affecting in the scope of communication characteristic, make the resonance frequency of antenna assembly 1 close to f1 (13.56MHz).
In addition, at communication object during near the antenna assembly 1 of card pattern, the path by capacitor C13 and inductor L11 from antenna circuit 12, voltage input rectification circuit 13, thus, the capacitance of variable-capacitance element C22 likely can change.In this case, although the resonance frequency of antenna circuit 12 can depart from 13.56MHz, due to antenna assembly 1, to receive power from communication object larger, therefore still has the enough electric power for reading out data to input to RFIC10.
Fig. 4 is the figure that represents the structure of the enclosure interior of the radio communication device of applying the related antenna assembly of present embodiment 1.The upper body of radio communication device 100 91 and lower case 92 are separated the vertical view exposing under inner state by Fig. 4.
The inside of top basket 91 is accommodated with circuit substrate 71,81, battery pack 83 etc.RFIC10, match circuit 11 and rectification circuit 13 are installed on circuit basic 71.In this circuit substrate 71, be equipped with UHF frequency-band antenna 72, camera model 76 etc.In addition, in circuit substrate 81, be equipped with UHF frequency-band antenna 82 etc.Circuit substrate 71 is connected by coaxial cable 84 with circuit substrate 81.
In lower case 92, be formed with opening 92A so that the camera lens of camera model 76 from optics state in exposing.And being provided with planar conductor in the mode of encirclement opening 92A in lower case 92 is aerial coil 12A.This aerial coil 12A is connected with RFIC10 etc.Utilize this aerial coil 12A and RFIC10 etc. to form the related antenna assembly 1 of present embodiment.
(execution mode 2)
Fig. 5 is the circuit diagram of the related antenna assembly of execution mode 2.In this example, antenna assembly 2 is identical with execution mode 1, comprises RFIC10, match circuit 11 and antenna circuit 12.In addition, antenna assembly 2 has rectification circuit 15, and this rectification circuit 15 comprises diode D1, D2, capacitor C3 and resistance R 1.
The voltage producing respectively on the Tx1 terminal of this rectification circuit 15 to RFIC10 and Tx2 terminal carries out rectification, and is applied on variable-capacitance element C22 as controlling voltage.Variable-capacitance element C22 has the structure identical with execution mode 1., rectification circuit 15 is to carrying out full-wave rectification from the alternating voltage of RFIC10 output.Thus, by variable-capacitance element C22 being applied to the control voltage making after ripple reduces, can carry out stable control to the electric capacity of variable-capacitance element C22.
(execution mode 3)
Fig. 6 is the circuit diagram of the related antenna assembly of execution mode 3.In this example, the Tx terminal of the RFIC10 that antenna assembly 3 has is connected with antenna circuit 17 via match circuit 16.
Antenna circuit 17 is one end coil antenna 12A, capacitor C21 of being connected to ground connection and the variable-capacitance element C22 resonant circuits that form that are connected in parallel.About each element, due to identical with execution mode 1, therefore description thereof is omitted.
Match circuit 16 has and is connected to inductor L11 and capacitor C11 Tx terminal, that form EMC filter.And, match circuit 16 also have be connected to EMC filter, as the capacitor C13 of the impedance matching of RFIC10 and antenna circuit 17 element.Thus, can be applicable to equally unbalanced circuit.
Label declaration
1,2,3 antenna assemblies
10RFIC (impedance commutation circuit)
11,16 match circuits
12,17 antenna circuits
12A aerial coil
13,15 rectification circuits (voltage applying circuit)
71,81 circuit substrates
76 camera models
82UHF frequency-band antenna
83 battery pack
84 coaxial cables
91 upper body
92 lower case
92A opening
100 radio communication devices
C3, C4, C5, C11, C12, C13, C14, C21 capacitor
C22 variable-capacitance element
L11, L12 inductor
D1, D2 diode
R1, R2, R3 resistance
Claims (3)
1. an antenna assembly, is characterized in that, comprising:
Impedance commutation circuit, this impedance commutation circuit has the input and output terminal of input/output signal, from the input pattern of described input and output terminal input signal with from the output mode of described input and output terminal output signal, the internal driving of described input and output terminal is switched;
Antenna circuit, this antenna circuit is connected to described input and output terminal;
Variable-capacitance element, this variable-capacitance element its electric capacity in the time being applied with control voltage can change, thereby the resonance frequency of described antenna circuit is changed;
Match circuit, this match circuit is connected between described input and output terminal and described antenna circuit, to carrying out impedance matching between described input and output terminal and described antenna circuit; And
Control voltage applying circuit, this control voltage applying circuit by with described input and output terminal on the voltage that produces control accordingly voltage and be applied on described variable-capacitance element,
From described input and output terminal output signal in the situation that, for the resonance frequency of described antenna circuit is made as to the resonance frequency corresponding with described output mode, described control voltage applying circuit output is applied to the control voltage of described variable-capacitance element.
2. antenna assembly as claimed in claim 1, is characterized in that,
Described control voltage applying circuit is the rectification circuit that the voltage to producing on described input and output terminal carries out rectification.
3. a communicator, is characterized in that,
Described communicator has the antenna assembly described in claim 1 or 2.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013107577A JP5761251B2 (en) | 2013-05-22 | 2013-05-22 | Antenna device and communication device |
| JP2013-107577 | 2013-05-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104184435A true CN104184435A (en) | 2014-12-03 |
| CN104184435B CN104184435B (en) | 2017-04-12 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410216480.5A Active CN104184435B (en) | 2013-05-22 | 2014-05-21 | Antenna device and communication device |
Country Status (2)
| Country | Link |
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| JP (1) | JP5761251B2 (en) |
| CN (1) | CN104184435B (en) |
Cited By (4)
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| CN107029435A (en) * | 2016-03-30 | 2017-08-11 | 株式会社万代 | Non-contact communication device and toy |
| CN108119817A (en) * | 2017-11-22 | 2018-06-05 | 郭雪梅 | For the Intelligent House Light circuit of smart machine control |
| CN109891258A (en) * | 2016-10-24 | 2019-06-14 | 皇家飞利浦有限公司 | For the balanced to unbalanced transformer in magnetic resonance imaging (MRI) system and using the MRI system of the balanced to unbalanced transformer |
| WO2022056709A1 (en) * | 2020-09-16 | 2022-03-24 | 深圳市汇顶科技股份有限公司 | Near-field communication apparatus and electronic device |
Families Citing this family (3)
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|---|---|---|---|---|
| US10055613B1 (en) * | 2017-02-06 | 2018-08-21 | Nxp B.V. | NFC reader with auto tuner |
| US10108825B2 (en) | 2017-03-22 | 2018-10-23 | Nxp B.V. | NFC reader with remote antenna |
| CN108061285A (en) * | 2017-11-22 | 2018-05-22 | 郭雪梅 | Control method is identified for the image of smart home energy-saving illuminating circuit |
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| US20070222605A1 (en) * | 2006-03-22 | 2007-09-27 | David Andresky | Auto-tuned RFID reader antenna |
| CN101662171A (en) * | 2008-08-29 | 2010-03-03 | 索尼株式会社 | Contactless receiver, resonant circuit, and variable capacitance element |
| US20100284263A1 (en) * | 2003-06-12 | 2010-11-11 | Yasuo Cho | Data recording / reproducing apparatus and method using needle-shaped member |
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| US20100284263A1 (en) * | 2003-06-12 | 2010-11-11 | Yasuo Cho | Data recording / reproducing apparatus and method using needle-shaped member |
| CN1834998A (en) * | 2005-03-16 | 2006-09-20 | 株式会社半导体能源研究所 | Information processing device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107029435A (en) * | 2016-03-30 | 2017-08-11 | 株式会社万代 | Non-contact communication device and toy |
| CN107029435B (en) * | 2016-03-30 | 2019-11-05 | 株式会社万代 | Non-contact communication device and toy |
| CN110833698A (en) * | 2016-03-30 | 2020-02-25 | 株式会社万代 | Non-contact communication device and toy |
| CN109891258A (en) * | 2016-10-24 | 2019-06-14 | 皇家飞利浦有限公司 | For the balanced to unbalanced transformer in magnetic resonance imaging (MRI) system and using the MRI system of the balanced to unbalanced transformer |
| CN108119817A (en) * | 2017-11-22 | 2018-06-05 | 郭雪梅 | For the Intelligent House Light circuit of smart machine control |
| WO2022056709A1 (en) * | 2020-09-16 | 2022-03-24 | 深圳市汇顶科技股份有限公司 | Near-field communication apparatus and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104184435B (en) | 2017-04-12 |
| JP2014230049A (en) | 2014-12-08 |
| JP5761251B2 (en) | 2015-08-12 |
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