CN104425901A - Frequency-adjustable antenna device and antenna frequency adjusting method - Google Patents
Frequency-adjustable antenna device and antenna frequency adjusting method Download PDFInfo
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- CN104425901A CN104425901A CN201310404478.6A CN201310404478A CN104425901A CN 104425901 A CN104425901 A CN 104425901A CN 201310404478 A CN201310404478 A CN 201310404478A CN 104425901 A CN104425901 A CN 104425901A
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Abstract
The invention provides a frequency-adjustable antenna device and an antenna frequency adjusting method. The frequency-adjustable antenna device comprises an antenna, a control circuit and a microcontroller, wherein the control circuit is coupled with the antenna, the control circuit has an equivalent impedance value, the microcontroller is provided with a sequence peripheral interface, the microcontroller is connected with the control circuit through the sequence peripheral interface, and the microcontroller enables the antenna to operate at first operation frequency through the control circuit, and detects the intensity of signals received by the antenna through the control circuit. The microcontroller adjusts the equivalent impedance value of the control circuit according to the intensity of the signals received by the antenna, so that the first operation frequency of the antenna is changed.
Description
Technical field
The present invention has about a kind of antenna, and particularly a kind of adjustable frequency antenna assembly and adjustment antenna frequencies method.
Background technology
Antenna is the significant components of radio communication device, and Antenna Design will consider frequency of operation, bandwidth, radiation pattern etc. usually.According to antenna apply the environment for use of communication specification and wireless communications products, antenna must be designed to have the frequency of operation and bandwidth that meet communication specification.But the standing-wave ratio (Standing Wave Ratio, SWR) of antenna may be subject to the impact of external environment and change, and then makes antenna can not get good standing-wave ratio in required frequency of operation.The operating frequency of antenna can the drift along with environment.So, antenna may be caused in use cannot to play its superperformance.
Summary of the invention
The embodiment of the present invention provides a kind of antenna assembly of adjustable frequency and the method for adjustment antenna frequencies, uses the frequency of operation of software-controlled manner adjustment antenna.
The embodiment of the present invention provides a kind of antenna assembly of adjustable frequency, and it comprises antenna, control circuit and microcontroller.Control circuit coupling antenna, control circuit has equivalent impedance.Microcontroller has serial peripheral interface, and microcontroller is through serial peripheral interface connection control circuit.Microcontroller makes antenna operation in the first frequency of operation through control circuit, the signal strength that microcontroller receives through control circuit detecting antenna.The equivalent impedance of the signal strength adjustment control circuit that microcontroller receives according to antenna, to change the first frequency of operation of antenna.
Wherein, when the signal strength that this antenna receives is lower than a critical value, this microcontroller promotes this first frequency of operation of this antenna;
Wherein, when the signal strength that this antenna receives is lower than a critical value, this microcontroller reduces this first frequency of operation of this antenna.
The embodiment of the present invention provides a kind of antenna assembly of adjustable frequency also to comprise: an impedance matching circuit, couples this antenna.Wherein, this microcontroller makes this antenna operation in one second frequency of operation through this control circuit, and this second frequency of operation is higher than this first frequency of operation.
The embodiment of the present invention provides a kind of method adjusting antenna frequencies, comprises the following steps.First, microcontroller makes antenna operation in the first frequency of operation through control circuit, and wherein microcontroller is through serial peripheral interface connection control circuit.Then, the signal strength that microcontroller receives through control circuit detecting antenna, wherein microcontroller adjusts the equivalent impedance of control circuit according to the signal strength that antenna receives, to change the first frequency of operation of antenna.
The embodiment of the present invention provides a kind of method adjusting antenna frequencies, also comprises:
When the signal strength that this antenna receives is lower than a critical value, this microcontroller promotes this first frequency of operation of this antenna;
When the signal strength that this antenna receives is lower than a critical value, this microcontroller reduces this first frequency of operation of this antenna.
Wherein, this microcontroller makes this antenna operation in one second frequency of operation through this control circuit, and this second frequency of operation is higher than this first frequency of operation;
Wherein, this microcontroller transmits a digital coding signal to this control circuit.
In sum, the embodiment of the present invention provides a kind of antenna assembly of adjustable frequency and the method for adjustment antenna frequencies, and it is when the signal strength that antenna receives changes because of environmental impact, with the frequency of operation of software mode through control circuit adjustment antenna.
Further understand feature of the present invention and technology contents for enable, refer to following detailed description for the present invention and accompanying drawing, but these illustrate and institute's accompanying drawings is only used to the present invention is described, but not any restriction is done to interest field of the present invention.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of the antenna assembly of the adjustable frequency that the embodiment of the present invention provides.
Fig. 2 is the Control timing sequence figure of the serial peripheral interface that the embodiment of the present invention provides.
Fig. 3 is the schematic diagram of the antenna assembly of the adjustable frequency that the embodiment of the present invention provides.
Fig. 4 is the standing-wave ratio figure of the antenna that the embodiment of the present invention provides.
Fig. 5 is the curve chart that the first frequency of operation of the antenna that the embodiment of the present invention provides changes along with digital coding signal.
Fig. 6 is the efficiency chart of the antenna that the embodiment of the present invention provides.
Fig. 7 is the schematic diagram of the efficiency of the first frequency of operation of the antenna that the embodiment of the present invention provides.
Fig. 8 is the flow chart of the method for the adjustment antenna frequencies that the embodiment of the present invention provides.
Description of reference numerals:
The antenna assembly of 1-adjustable frequency; 10-circuit board; 11-antenna; 12-control circuit; 13-microcontroller; 14-impedance matching circuit; CS, SCLK, DIN-signal; 131-serial peripheral interface; Code_0, code_20, code_40, code_60, code_80, code_100, code_120-encode; S101, S103-steps flow chart.
Embodiment
(embodiment of the antenna assembly of adjustable frequency)
Please refer to Fig. 1, Fig. 1 is the functional block diagram of the antenna assembly of the adjustable frequency that the embodiment of the present invention provides.The antenna assembly 1 of adjustable frequency may be used for radio communication device, such as: mobile phone, flat computer etc.The antenna assembly 1 of adjustable frequency comprises antenna 11, control circuit 12, microcontroller (MCU) 13 and impedance matching circuit 14.Microcontroller 13 has serial peripheral interface (Serial Peripheral Interface, SPI), and microcontroller 13 is through serial peripheral interface connection control circuit 12.In the present embodiment, impedance matching circuit 14 coupling antenna 11 and impedance matching in order to adjust antenna 11.
Please refer to Fig. 2, Fig. 2 is the Control timing sequence figure of the serial peripheral interface that the embodiment of the present invention provides.Serial peripheral interface can comprise signal CS, SCLK, DIN etc.Signal SCLK represents sequence frequency (SerialClock).Signal CS represents enable signal, and signal CS is activation (Enable) when electronegative potential.Signal DIN represents the coded data (Data) exported.
Multiple with reference to Fig. 1, control circuit 12 has equiva lent impedance (as: equivalent capacitance value or equivalent inductance value).Control circuit 12 can have at least one electric capacity or at least one inductance.Microcontroller 13 makes antenna operation at the first frequency of operation f1 and the second frequency of operation f2 through control circuit 12, and the second frequency of operation f2 is higher than the first frequency of operation f1.Microcontroller 13 detects through control circuit 12 signal strength that antenna 11 receives.The equivalent impedance of the signal strength adjustment control circuit 12 that microcontroller 13 receives according to antenna 11, to change the first frequency of operation f1 of antenna 11.
In practice, antenna 11 may make frequency of operation change by external environmental impact.The signal strength that microcontroller 13 can receive according to system is to judge whether signal changes to some extent, changed if very likely the operating frequency of antenna is existing when signal strength diminishes, when microcontroller 13 finds that signal strength dies down, can export by microcontroller 13 frequency of operation that corresponding control signal changes antenna 11.
Referring to Fig. 1 and Fig. 3, Fig. 3 is the schematic diagram of the antenna assembly of the adjustable frequency that the embodiment of the present invention provides.The antenna assembly 1 of adjustable frequency arranges on the circuit board 10, circuit board 10 is arranged antenna 11, control circuit 12, microcontroller 13 and impedance matching circuit 14.Antenna 11 can modular setting on the circuit board 10.Impedance matching circuit 14 can reach best power transmission for the impedance adjusted between antenna and system.In the present embodiment, control circuit 12 can pass through transmission line with microcontroller 13 and is connected, described circuit is serial peripheral interface 131 specification (as three signals CS, SCLK, DIN that Fig. 2 discloses) meeting microcontroller 13, but therefore the present invention does not limit.Microcontroller 13 transmits digital coding signal (code) to control circuit 12, makes the frequency of its antenna 11 produce corresponding frequency change by the control of coding.
Please refer to Fig. 4, Fig. 4 is the standing-wave ratio figure of the antenna that the embodiment of the present invention provides.According to different digital coding signals, control circuit 12 can change the frequency of the first frequency of operation f1.As shown in Figure 4, encode code_0, code_20, code_40, code_60, code_80, code_100, code_120.In the diagram, coding code_0, code_20, code_40, code_60, code_80, code_100, code_120 increases the frequency of the first frequency of operation f1 gradually.Such as: the first frequency of operation f1 can change between 704MHz to 960MHz.The frequency values of the first frequency of operation f1 of the corresponding antenna 11 of each coding, and each coding can a specific equivalent impedance of corresponding control circuit 12.Therefore, antenna 11 can obtain a good standing-wave ratio in required frequency of operation, makes the signal strength grow that antenna 11 receives.
In practice, in order to the bandwidth of the first frequency of operation f1 of the frequency range of antenna 11 between 704MHz and 960MHz will be increased, the Antenna Design of usual needs complexity or larger antenna volume, so may increase design cost and can not meet the demand of existing Mobile Telecommunication System.Therefore, the present invention proposes the design adjusting antenna frequencies, the space that circuit framework is simple and required when can reduce Antenna Design.Such as: when the bandwidth of the first frequency of operation f1 of antenna 11 is not enough to the whole frequency range contained between 704MHz to 960MHz, the first frequency of operation f1 can be divided the working range that is cut to several sections and the digital coding signal produced according to microcontroller 13 and adjusting.Make the antenna after change first frequency of operation f1, good standing-wave ratio can be obtained in selected frequency range.
In an embodiment of the present invention, the signal strength that antenna 11 receives detected by microcontroller 13.When the signal strength that antenna 11 receives is lower than a critical value, microcontroller 13 promotes the first frequency of operation f1 of antenna 11.Microcontroller 13 can produce digital coding signal, to adjust the first frequency of operation f1 of antenna 11.Then, the signal strength that antenna 11 receives detected again by microcontroller 13, and judges whether again to adjust.
It is worth mentioning that, in the present embodiment, the second frequency of operation f2 contains the frequency near 1900MHz.In various coding, the second frequency of operation f2 is not changed substantially.Control circuit 12 only mainly changes the first frequency of operation f1 of antenna 11, and the frequency values (near 900MHz) of the frequency values of the second frequency of operation f2 (near 1900MHz) distance the first frequency of operation f1 is quite far away, when the standing-wave ratio of the first frequency of operation f1 of antenna 11 is changed, the standing-wave ratio of the second frequency of operation f2 is substantially unaffected.
Please refer to Fig. 5 is the curve chart that the first frequency of operation f1 of the antenna that the embodiment of the present invention provides changes along with digital coding signal.When digital coding signal changes to coding code_120 gradually by the code_0 that encodes, the first frequency of operation f1 is increased to 950MHz by 890MHzy gradually.Such as: when when encoding code_0, if the signal strength that antenna 11 receives is lower than critical value, then microcontroller 13 progressively can change coding, such as, change into code_20, Code_40, Code_80 etc., to finding a stronger signal in the frequency wherein corresponding to a coding.
Referring to Fig. 6 and Fig. 7, Fig. 6 is the efficiency chart of the antenna that the embodiment of the present invention provides.Fig. 7 is the efficiency chart of the first frequency of operation f1 of the antenna that the embodiment of the present invention provides.Can be learnt that by Fig. 4 and Fig. 7 the efficiency of antenna during the standing wave frequency shift of antenna also can change thereupon, and antenna can be made in the frequency range of the first frequency of operation f1 all can to obtain preferably antenna efficiency.Antenna does not change along with coding substantially in the efficiency of the second frequency of operation f2, because the standing-wave ratio of the second frequency of operation f2 does not change (with reference to Fig. 4) haply.
(embodiment of the method for adjustment antenna frequencies)
Referring to Fig. 1 and Fig. 8, Fig. 8 is the flow chart of the method for the adjustment antenna frequencies that the embodiment of the present invention provides.The present embodiment provides a kind of method adjusting antenna frequencies, and described method realizes with the antenna assembly 1 of the adjustable frequency of Fig. 1.About the antenna assembly 1 of adjustable frequency, please refer to the explanation of previous embodiment.The method of described adjustment antenna frequencies comprises the following steps.First, in step S101, microcontroller 13 makes antenna 11 operate in the first frequency of operation f1 through control circuit 12, and wherein microcontroller 13 is through serial peripheral interface connection control circuit 12.Then, in step s 103, microcontroller 13 detects through control circuit 12 signal strength that antenna 11 receives, wherein the equivalent impedance of signal strength adjustment control circuit 12 that receives according to antenna 11 of microcontroller 13, to change the first frequency of operation f1 of antenna 11.In an embodiment of the present invention, microcontroller 13 also makes antenna 11 operate in the second frequency of operation f2 through control circuit 12, and the second frequency of operation f2 is higher than the first frequency of operation f1.Microcontroller 13 transmission meets the digital coding signal of serial peripheral interface specification to control circuit 12.
In an embodiment of the present invention, in step s 103, when the signal strength that antenna 11 receives is lower than a critical value, microcontroller 13 promotes the first frequency of operation f1 of antenna 11.In an embodiment of the present invention, when the signal strength that antenna 11 receives is lower than a critical value, microcontroller 13 reduces the first frequency of operation f1 of antenna 11.
(possible effect of embodiment)
In sum, the antenna assembly of a kind of adjustable frequency that the embodiment of the present invention provides and the method for adjustment antenna frequencies, it is when the signal strength that antenna receives changes because of environmental impact, with the frequency of operation of software mode through control circuit adjustment antenna.Circuit framework is simple, and can avoid the problem of the bandwidth deficiency of the frequency of operation of antenna.
The foregoing is only embodiments of the invention, it is also not used to limit to the scope of the claims of the present invention.
Claims (10)
1. an antenna assembly for adjustable frequency, is characterized in that, comprising:
One antenna;
One control circuit, couples this antenna, and this control circuit has an equivalent impedance; And
One microcontroller, there is a serial peripheral interface, this microcontroller connects this control circuit through this serial peripheral interface, this microcontroller makes this antenna operation in one first frequency of operation through this control circuit, this microcontroller detects through this control circuit the signal strength that this antenna receives, wherein this microcontroller adjusts this equivalent impedance of this control circuit according to the signal strength that this antenna receives, to change this first frequency of operation of this antenna.
2. the antenna assembly of adjustable frequency according to claim 1, is characterized in that, when the signal strength that this antenna receives is lower than a critical value, this microcontroller promotes this first frequency of operation of this antenna.
3. the antenna assembly of adjustable frequency according to claim 1, is characterized in that, when the signal strength that this antenna receives is lower than a critical value, this microcontroller reduces this first frequency of operation of this antenna.
4. the antenna assembly of adjustable frequency according to claim 1, is characterized in that, more comprises:
One impedance matching circuit, couples this antenna.
5. the antenna assembly of adjustable frequency according to claim 1, is characterized in that, this microcontroller makes this antenna operation in one second frequency of operation through this control circuit, and this second frequency of operation is higher than this first frequency of operation.
6. adjust a method for antenna frequencies, it is characterized in that, comprising:
One microcontroller makes an antenna operation in one first frequency of operation through a control circuit, and wherein this microcontroller connects this control circuit through a serial peripheral interface; And
This microcontroller detects through this control circuit the signal strength that this antenna receives, and wherein this microcontroller adjusts an equivalent impedance of this control circuit according to the signal strength that this antenna receives, to change this first frequency of operation of this antenna.
7. the method for adjustment antenna frequencies according to claim 6, is characterized in that, more comprise:
When the signal strength that this antenna receives is lower than a critical value, this microcontroller promotes this first frequency of operation of this antenna.
8. the method for adjustment antenna frequencies according to claim 6, is characterized in that, more comprise:
When the signal strength that this antenna receives is lower than a critical value, this microcontroller reduces this first frequency of operation of this antenna.
9. the method for adjustment antenna frequencies according to claim 6, is characterized in that, this microcontroller makes this antenna operation in one second frequency of operation through this control circuit, and this second frequency of operation is higher than this first frequency of operation.
10. the method for adjustment antenna frequencies according to claim 6, is characterized in that, this microcontroller transmits a digital coding signal to this control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310404478.6A CN104425901A (en) | 2013-09-06 | 2013-09-06 | Frequency-adjustable antenna device and antenna frequency adjusting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310404478.6A CN104425901A (en) | 2013-09-06 | 2013-09-06 | Frequency-adjustable antenna device and antenna frequency adjusting method |
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| Publication Number | Publication Date |
|---|---|
| CN104425901A true CN104425901A (en) | 2015-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310404478.6A Pending CN104425901A (en) | 2013-09-06 | 2013-09-06 | Frequency-adjustable antenna device and antenna frequency adjusting method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106169944A (en) * | 2015-05-18 | 2016-11-30 | 和硕联合科技股份有限公司 | Automatic parameter adjusting system and automatic parameter adjusting method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080280570A1 (en) * | 2007-05-07 | 2008-11-13 | Guillaume Blin | Hybrid techniques for antenna retuning utilizing transmit and receive power information |
| CN102420353A (en) * | 2010-09-28 | 2012-04-18 | 宏达国际电子股份有限公司 | Antenna module |
| CN202817176U (en) * | 2012-09-29 | 2013-03-20 | 速码波科技股份有限公司 | Adjustable antenna module |
-
2013
- 2013-09-06 CN CN201310404478.6A patent/CN104425901A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080280570A1 (en) * | 2007-05-07 | 2008-11-13 | Guillaume Blin | Hybrid techniques for antenna retuning utilizing transmit and receive power information |
| CN102420353A (en) * | 2010-09-28 | 2012-04-18 | 宏达国际电子股份有限公司 | Antenna module |
| CN202817176U (en) * | 2012-09-29 | 2013-03-20 | 速码波科技股份有限公司 | Adjustable antenna module |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106169944A (en) * | 2015-05-18 | 2016-11-30 | 和硕联合科技股份有限公司 | Automatic parameter adjusting system and automatic parameter adjusting method thereof |
| CN106169944B (en) * | 2015-05-18 | 2019-02-22 | 和硕联合科技股份有限公司 | Automatic parameter adjusting system and automatic parameter adjusting method thereof |
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