CN103338018A - Intelligent impedance matching device of LC resonant antenna - Google Patents
Intelligent impedance matching device of LC resonant antenna Download PDFInfo
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- CN103338018A CN103338018A CN2013102217742A CN201310221774A CN103338018A CN 103338018 A CN103338018 A CN 103338018A CN 2013102217742 A CN2013102217742 A CN 2013102217742A CN 201310221774 A CN201310221774 A CN 201310221774A CN 103338018 A CN103338018 A CN 103338018A
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Abstract
The invention relates to an intelligent impedance matching device of an LC resonant antenna. With the intelligent impedance matching device adopted, problems such as manual matching, long time matching, complicated process and low precision in an existing antenna impedance matching method can be solved. The intelligent impedance matching device includes the LC resonant antenna, an adjustable matching circuit unit, a test circuit unit and a micro controller; a planar spiral inductor and a parallel plate capacitor are connected in series so as to form the LC resonant antenna; the adjustable matching circuit unit includes an inductor, a first adjustable capacitor array and a second adjustable capacitor array which are in pi-shaped impedance matching network connection; the test circuit unit includes a signal generator; a Wheatstone bridge is connected between two ends of the signal generator; and four bridge arms of the Wheatstone bridge respectively are a first resistor, a second resistor, a third resistor and the adjustable matching circuit unit. The intelligent impedance matching device of the invention has the advantages of high matching efficiency, short matching time, simple matching process, high matching precision and low cost, and can be greatly adaptive to the development of some handheld RF devices.
Description
Technical field
The present invention relates to a kind of impedance-matching device, specifically is a kind of intelligent impedance-matching device of LC resonant antenna.
Background technology
In some non contact signal transmission occasions, as radio-frequency (RF) identification (RFID, Radio Frequency Identity) passive and wireless detection of technology, LC resonant transducer etc., utilize the wireless coupling signal transmission form to carry out the noncontact two-way communication, realize that contactless information transmission and the information of passing through to transmit reach the purpose of identification and detected object.The transmission of wireless coupling signal realizes by the mutual inductance coupling of two inductance coils, under remote mutual inductance coupling situation, need to increase the energy of signal transmitting antenna end, therefore need carry out impedance matching to information source and transmitting antenna, make the signal of signal source can be transferred to maximum power antenna end.
Coupling for antenna impedance, existing research mainly also concentrates on manually mates the aspect, manually matching process needs the user to rely on experience and field observation to carry out the adjusting of matching network fully, this has just caused long, shortcoming such as matching precision is low match time, must be equipped with some expensive equipment in addition, as network analyzer or electric impedance analyzer etc.Simultaneously, the development of some handheld RF equipment makes that manually coupling is more and more incompatible.
High speed development along with automatic technology, the communication technology and integrated technology, add the extensive appearance of digital signal processor, microcontroller and microprocessor, coupling for antenna impedance also proposes new requirement, and manually coupling is a length consuming time and complicated process.Therefore, the automatic matching technique of antenna impedance also will become a kind of development trend.
Summary of the invention
To the objective of the invention is still to concentrate on manually coupling in order solving for the existing method of the coupling of antenna impedance, to have long, problem such as matching process is complicated, matching precision is low match time, and a kind of intelligent impedance-matching device of LC resonant antenna is provided.The design concept of apparatus of the present invention and method thereof can not change under the LC resonant antenna structure Design, are solved the problem of LC resonant antenna efficiency of transmission and transmission range.
The present invention is achieved by the following technical solutions:
A kind of intelligent impedance-matching device of LC resonant antenna comprises LC resonant antenna, adjustable match circuit unit, test circuit unit and microcontroller; Described LC resonant antenna is made up of planar spiral inductor and parallel-plate capacitances in series; Described adjustable match circuit unit comprises inductance, the first adjustable capacitor array and the second adjustable capacitor array, inductance, (π type impedance matching network connected mode is existing known technology to be the connection of π type impedance matching network form between the first adjustable capacitor array and the second adjustable capacitor array three, be well-known to those skilled in the art, as shown in Figure 2), wherein, the described first adjustable capacitor array and the second adjustable capacitor array all are to be formed by connecting side by side by several electric capacity shown in Figure 3, and are serially connected with the corresponding simulating switch in the parallel branch of each electric capacity; The LC resonant antenna is connected in parallel on the two ends of the second adjustable capacitor array in the adjustable match circuit unit; Described test circuit unit comprises signal generator, connect a Wheatstone bridge between the two ends of signal generator, four brachium pontis are respectively: first resistance, second resistance, the 3rd resistance and adjustable match circuit unit, wherein, the resistance of first resistance, second resistance and the 3rd resistance equates and is equal to the characteristic impedance of signal generator; A node between a node, adjustable match circuit unit and second resistance in the Wheatstone bridge between first resistance and the 3rd resistance is connected with the input of microcontroller respectively, and node between the 3rd resistance and the adjustable match circuit unit and microcontroller are altogether; The output of microcontroller is connected with adjustable match circuit unit in order to the disconnection of controlling the analog switch of the first adjustable capacitor array and the second adjustable capacitor array in the adjustable match circuit unit with closed (microcontroller is in order to carry out real-time and effective control to whole system, microcontroller can be monitored the mould of LC resonant antenna end reflection coefficient and the situation of change of phase place, and selects corresponding capacitance to realize the coupling of impedance according to the mould of reflection coefficient and the automatic analog switch of controlling in the adjustable match circuit unit of situation of change of phase place).
When using invention to carry out the impedance matching test: at first, output signal U 3, the Uz of test circuit unit is given to microcontroller, microcontroller carries out the A/D conversion with two paths of signals; Secondly, the digital signal that microcontroller calls after corresponding algorithm is changed two-way A/D is handled and is calculated, and draws amplitude and the phase place of two paths of signals; At last, microcontroller is according to the amplitude of two paths of signals and the testing result of phase place, the analog switch of controlling first and second the adjustable capacitor array in the adjustable match circuit unit carries out adhesive or disconnection, namely change the capacitance of the first adjustable capacitor array and the second adjustable capacitor array in the π type impedance matching network, make Wheatstone bridge in the test circuit unit reach balance (even voltage U d=|U3-UZ shown in Figure 1 |=0, the size of Ud and phase place all are 0), namely reach the impedance matching state.
Further, described LC resonant antenna adopts print circuit plates making to form, comprise circuit board and following circuit board, at the upper surface printing planar spiral inductor of last circuit board, the top crown of lower surface printing parallel plate capacitor, print the bottom crown of parallel plate capacitor at the upper surface of following circuit board; In last circuit board punching sputter electrical wiring is arranged, an end of electrical wiring is connected with an end of planar spiral inductor, and the other end of electrical wiring links to each other with the top crown of parallel plate capacitor.
Described microcontroller adopts the DSP that carries the A/D translation function.DSP(Digital Signal Processor) being a kind of microprocessor of uniqueness, is the device of handling bulk information with digital signal.Its operation principle is to receive analog signal, is converted to 0 or 1 digital signal.Again digital signal is made amendment, deletes, strengthened, and in the other system chip, analogue data or actual environment form are returned in the numerical data decipher.It is not only programmable, and the speed of service can reach the per second number with ten million bar complicated order program in fact the time, considerably beyond general purpose microprocessor, is the computer chip that becomes more and more important in the digitalized electron world.Its powerful data-handling capacity and the high speed of service are two the most commendable big characteristics.
Described upper and lower circuit board all adopts the epoxy resin substrate to be made; The last bottom crown of described planar spiral inductor, parallel plate capacitor and electrical wiring all adopt the copper facing mode to form, and planar spiral inductor is copper coil, and the upper and lower pole plate of parallel plate capacitor is square copper coin, and electrical wiring is copper cash.
Apparatus of the present invention design is ingenious, simple in structure, reliability is high, when carrying out impedance matching, the matching efficiency height, match time is short, matching process is simple, matching precision is high, and need not good consciousness and rich experience can realize automatic coupling, the configuration of also having saved expensive device has simultaneously greatly reduced cost.In addition, apparatus of the present invention can also adapt to the development of some handheld RF equipment well, meet the demand of technical development.
Description of drawings
Fig. 1 is apparatus of the present invention system framework figure.
Fig. 2 is adjustable match circuit cell schematics in apparatus of the present invention.
Fig. 3 is the first adjustable capacitor array and the second adjustable capacitor array schematic diagram in apparatus of the present invention.
Fig. 4 is LC resonant antenna structural representation in apparatus of the present invention.
Fig. 5 is the A-A cutaway view of Fig. 4.
Among the figure: circuit board, 1-5-electrical wiring, the adjustable match circuit of 2-unit, 2-1-inductance, the 2-2-first adjustable capacitor array, the 2-3-second adjustable capacitor array, 3-test circuit unit, 3-1-signal generator, 4-microcontroller, R1-first resistance, R2-second resistance, R3-the 3rd resistance under 1-LC resonant antenna, 1-1-planar spiral inductor, 1-2-parallel plate capacitor, 1-2-1-top crown, 1-2-2-bottom crown, the last circuit board of 1-3-, the 1-4-.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described:
As shown in Figure 1 to Figure 3, a kind of intelligent impedance-matching device of LC resonant antenna comprises LC resonant antenna 1, adjustable match circuit unit 2, test circuit unit 3 and microcontroller 4; Described LC resonant antenna 1 is composed in series by planar spiral inductor 1-1 and parallel plate capacitor 1-2; Described adjustable match circuit unit 2 comprises inductance 2-1, the first adjustable capacitor array 2-2 and the second adjustable capacitor array 2-3, being π type impedance matching network form between inductance 2-1, the first adjustable capacitor array 2-2 and the second adjustable capacitor array 2-3 three connects, wherein, the described first adjustable capacitor array 2-2 and the second adjustable capacitor array 2-3 are connected in parallel by several electric capacity and form, and are serially connected with the corresponding simulating switch in the parallel branch of each electric capacity; LC resonant antenna 1 is connected in parallel on the two ends of the second adjustable capacitor array 2-3 in the adjustable match circuit unit 2; Described test circuit unit 3 comprises signal generator 3-1, connect a Wheatstone bridge between the two ends of signal generator 3-1, four brachium pontis of Wheatstone bridge are respectively: first resistance R 1, second resistance R 2, the 3rd resistance R 3 and adjustable match circuit unit 2, wherein, first resistance R 1, second resistance R 2, the resistance of the 3rd resistance R 3 equates and is equal to the characteristic impedance of signal generator 3-1, a node in the Wheatstone bridge between first resistance R 1 and the 3rd resistance R 3, a node between adjustable match circuit unit 2 and second resistance R 2 is connected with the input of microcontroller 4 respectively, and node between the 3rd resistance R 3 and the adjustable match circuit unit 2 and microcontroller 4 are altogether; The output of microcontroller 4 is connected with adjustable match circuit unit 2 in order to the disconnection of controlling the analog switch of the first adjustable capacitor array 2-2 and the second adjustable capacitor array 2-3 in the adjustable match circuit unit 2 with closed.
Further, shown in Fig. 4,5, described LC resonant antenna 1 adopts print circuit plates making to form, comprise circuit board 1-3 and following circuit board 1-4, at the upper surface printing planar spiral inductor 1-1 of last circuit board 1-3, the top crown 1-2-1 of lower surface printing parallel plate capacitor 1-2, print the bottom crown 1-2-2 of parallel plate capacitor 1-2 at the upper surface of following circuit board 1-4; In last circuit board 1-3 punching sputter electrical wiring 1-5 is arranged, the end of electrical wiring 1-5 is connected with the end of planar spiral inductor 1-1, and the other end of electrical wiring 1-5 links to each other with the top crown 1-2-1 of parallel plate capacitor 1-2.
Described microcontroller (4) adopts the DSP that carries the A/D translation function.
Described upper and lower circuit board 1-3,1-4 adopt the epoxy resin substrate to be made; Last bottom crown 1-2-1, the 1-2-2 of described planar spiral inductor 1-1, parallel plate capacitor 1-2 and electrical wiring 1-5 adopt the copper facing mode to form, planar spiral inductor 1-1 is copper coil, upper and lower pole plate 1-2-1, the 1-2-2 of parallel plate capacitor 1-2 are square copper coin, and electrical wiring 1-5 is copper cash.
Claims (4)
1. the intelligent impedance-matching device of a LC resonant antenna is characterized in that: comprise LC resonant antenna (1), adjustable match circuit unit (2), test circuit unit (3) and microcontroller (4); Described LC resonant antenna (1) is composed in series by planar spiral inductor (1-1) and parallel plate capacitor (1-2); Described adjustable match circuit unit (2) comprises inductance (2-1), the first adjustable capacitor array (2-2) and the second adjustable capacitor array (2-3), being π type impedance matching network form between inductance (2-1), the first adjustable capacitor array (2-2) and second adjustable capacitor array (2-3) three connects, wherein, the described first adjustable capacitor array (2-2) and the second adjustable capacitor array (2-3) all are connected in parallel by several electric capacity and form, and are serially connected with the corresponding simulating switch in the parallel branch of each electric capacity; LC resonant antenna (1) is connected in parallel on the two ends of the second adjustable capacitor array (2-3) in the adjustable match circuit unit (2); Described test circuit unit (3) comprises signal generator (3-1), connect a Wheatstone bridge between the two ends of signal generator (3-1), four brachium pontis of Wheatstone bridge are respectively: first resistance (R1), second resistance (R2), the 3rd resistance (R3) and adjustable match circuit unit (2), wherein, first resistance (R1), second resistance (R2), the resistance of the 3rd resistance (R3) equates and is equal to the characteristic impedance of signal generator (3-1), a node in the Wheatstone bridge between first resistance (R1) and the 3rd resistance (R3), a node between adjustable match circuit unit (2) and second resistance (R2) is connected with the input of microcontroller (4) respectively, and node between the 3rd resistance (R3) and the adjustable match circuit unit (2) and microcontroller (4) are altogether; The output of microcontroller (4) is connected with adjustable match circuit unit (2) in order to the disconnection of controlling the analog switch of the first adjustable capacitor array (2-2) and the second adjustable capacitor array (2-3) in the adjustable match circuit unit (2) with closed.
2. the intelligent impedance-matching device of LC resonant antenna according to claim 1, it is characterized in that: described LC resonant antenna (1) adopts print circuit plates making to form, comprise circuit board (1-3) and following circuit board (1-4), at the upper surface printing planar spiral inductor (1-1) of last circuit board (1-3), the top crown (1-2-1) of lower surface printing parallel plate capacitor (1-2), print the bottom crown (1-2-2) of parallel plate capacitor (1-2) at the upper surface of following circuit board (1-4); In last circuit board (1-3) punching sputter electrical wiring (1-5) is arranged, an end of electrical wiring (1-5) is connected with an end of planar spiral inductor (1-1), and the other end of electrical wiring (1-5) links to each other with the top crown (1-2-1) of parallel plate capacitor (1-2).
3. the intelligent impedance-matching device of LC resonant antenna according to claim 1 and 2 is characterized in that: described microcontroller (4) adopts the DSP that carries the A/D translation function.
4. the intelligent impedance-matching device of LC resonant antenna according to claim 2, it is characterized in that: described upper and lower circuit board (1-3,1-4) all adopts the epoxy resin substrate to be made; The last bottom crown of described planar spiral inductor (1-1), parallel plate capacitor (1-2) (1-2-1,1-2-2) and electrical wiring (1-5) all adopt the copper facing mode to form, planar spiral inductor (1-1) is copper coil, the upper and lower pole plate of parallel plate capacitor (1-2) (1-2-1,1-2-2) is square copper coin, and electrical wiring (1-5) is copper cash.
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| CN2013102217742A CN103338018A (en) | 2013-06-06 | 2013-06-06 | Intelligent impedance matching device of LC resonant antenna |
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| CN2013102217742A CN103338018A (en) | 2013-06-06 | 2013-06-06 | Intelligent impedance matching device of LC resonant antenna |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577358A (en) * | 2013-10-22 | 2015-04-29 | 恩智浦有限公司 | Antenna resonance frequency control driver |
| CN104716922A (en) * | 2013-12-12 | 2015-06-17 | 深圳富泰宏精密工业有限公司 | Electronic device |
| CN105227154A (en) * | 2014-06-04 | 2016-01-06 | 北京北方微电子基地设备工艺研究中心有限责任公司 | A kind of impedance-matching device |
| CN106384893A (en) * | 2016-11-15 | 2017-02-08 | 上海传英信息技术有限公司 | Antenna matching circuit and wireless communication terminal |
| WO2018040178A1 (en) * | 2016-08-31 | 2018-03-08 | 宇龙计算机通信科技(深圳)有限公司 | Radio frequency circuit and wireless communication device having radio frequency circuit |
| CN110970889A (en) * | 2018-10-01 | 2020-04-07 | 通用电气航空系统有限公司 | Modular power block and method of operating a power distribution system |
| CN111162740A (en) * | 2019-12-27 | 2020-05-15 | 中北大学 | Radio frequency general communication interface difference and common mode decoupling device |
| WO2021098437A1 (en) * | 2019-11-19 | 2021-05-27 | 北京铁路信号有限公司 | Phase simulation device |
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| US20120007691A1 (en) * | 2010-07-06 | 2012-01-12 | Lg Innotek Co., Ltd. | Impedance matching apparatus and method of antenna circuit |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577358A (en) * | 2013-10-22 | 2015-04-29 | 恩智浦有限公司 | Antenna resonance frequency control driver |
| CN104577358B (en) * | 2013-10-22 | 2018-01-12 | 恩智浦有限公司 | Antenna controling circuit, multifrequency antenna system and the method for adjusting much frequency resonance antenna |
| CN104716922A (en) * | 2013-12-12 | 2015-06-17 | 深圳富泰宏精密工业有限公司 | Electronic device |
| CN105227154A (en) * | 2014-06-04 | 2016-01-06 | 北京北方微电子基地设备工艺研究中心有限责任公司 | A kind of impedance-matching device |
| CN105227154B (en) * | 2014-06-04 | 2018-12-11 | 北京北方华创微电子装备有限公司 | A kind of impedance-matching device |
| WO2018040178A1 (en) * | 2016-08-31 | 2018-03-08 | 宇龙计算机通信科技(深圳)有限公司 | Radio frequency circuit and wireless communication device having radio frequency circuit |
| CN106384893A (en) * | 2016-11-15 | 2017-02-08 | 上海传英信息技术有限公司 | Antenna matching circuit and wireless communication terminal |
| CN110970889A (en) * | 2018-10-01 | 2020-04-07 | 通用电气航空系统有限公司 | Modular power block and method of operating a power distribution system |
| CN110970889B (en) * | 2018-10-01 | 2023-11-03 | 通用电气航空系统有限公司 | Modular power block and method of operating a power distribution system |
| WO2021098437A1 (en) * | 2019-11-19 | 2021-05-27 | 北京铁路信号有限公司 | Phase simulation device |
| CN111162740A (en) * | 2019-12-27 | 2020-05-15 | 中北大学 | Radio frequency general communication interface difference and common mode decoupling device |
| CN111162740B (en) * | 2019-12-27 | 2023-03-31 | 中北大学 | Radio frequency general communication interface difference and common mode decoupling device |
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