CN102664305B - FM (frequency modulation) antenna and cellphone - Google Patents
FM (frequency modulation) antenna and cellphone Download PDFInfo
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- CN102664305B CN102664305B CN201210103469.9A CN201210103469A CN102664305B CN 102664305 B CN102664305 B CN 102664305B CN 201210103469 A CN201210103469 A CN 201210103469A CN 102664305 B CN102664305 B CN 102664305B
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- inductance
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Abstract
The invention discloses an FM (frequency modulation) antenna which comprises an insulating baseboard, a feedback point and a metal lead portion electrically connected with the feedback point, wherein both the feedback point and the metal lead portion are arranged on the surface of the insulating baseboard; and at least one electric inductor is connected in series on a routing path of the metal lead portion. The FM antenna is still capable of realizing good resonance and receiving signals when the length of the metal lead portion is shortened to receive 1/4 of the wavelength by connecting at least one inductor in series on the routing path of the metal lead portion. The shortening of the metal lead portion decreases the occupied space of the FM antenna. Therefore, the FM antenna can be arranged inside a cellphone to avoid the defect that external plugging of an earphone as the antenna is needed. The invention also provides the cellphone containing the FM antenna.
Description
Technical field
The present invention relates to field of antenna, particularly a kind of FM antenna and the mobile phone comprising this FM antenna.
Background technology
Along with the development of mobile communication technology, the function of mobile phone from strength to strength, such as, video playback, take pictures, record a video, e-book, Internet chat even frequency modulation (FM, Frequency Modulation) broadcast capability.The frequency range of FM broadcasting is 87.5MH
zto 108MH
z, corresponding wavelength is 3.4 meters to 2.7 meters, is commonly referred to as 3 VHF bands, belongs to very high frequency(VHF) (VHF, Very High Frequency) section.According to antenna theory, the length of antenna be receive wavelength four/for the moment, could optimum resonance be realized.Therefore, when reception 3 VHF band electromagnetic wave, the length of antenna needs to reach 75 centimetres.In actual production process, portable radio adopts the telescopic antenna of 75 centimetres to be practicable, but for the mobile phone be gripped in palm, the design of the FM antenna (FM antenna, frequency-modulated antenna) of 75 centimetres is obviously infeasible.The existing mobile phone with FM function by extrapolation earphone as FM antenna.
Flexible PCB (FPC, Flexible Printed Circuit board), be called for short soft board, with polyimides (polyimide, or polyester film (PET PI), also known as Mylar) one made for base material has height reliability, excellent flexible printed circuit.It has the advantages that distribution density is high, lightweight, thickness is thin, is suitable for the electronic product of the high integration such as mobile phone, notebook computer, PDA or digital camera.
Therefore, on flexible PCB, study and develop a kind of length shorter, take up room little but do not affect the FM antenna of receptivity and to comprise the mobile phone of this FM antenna particularly necessary.
Summary of the invention
The technical problem to be solved in the present invention is that the FM antenna in order to overcome mobile phone of the prior art takes up room large and needs by the defect of extrapolation earphone as antenna, a kind of FM antenna and the mobile phone comprising this FM antenna are provided, this FM antenna is arranged on flexible PCB, and length is shorter and take up room little.
The present invention solves above-mentioned technical problem by following technical proposals:
A kind of FM antenna, it comprises an insulated substrate, feedback point and the plain conductor portion be electrically connected with this feedback point, this feedback point and this plain conductor portion are all arranged on the surface of this insulated substrate, and its feature is, at least one inductance that the wiring path in this plain conductor portion is connected.
Preferably, this plain conductor portion adopts tortuous cabling mode.By adopting tortuous cabling mode in plain conductor portion and being arranged on the surface of this insulated substrate by plain conductor portion, reduce taking up room of this FM antenna.
Preferably, two inductance that the wiring path in this plain conductor portion is connected, this plain conductor portion adopts serpentine cabling, and the track lengths between those inductance and this feedback point is 10-30mm.Suppose that the length of antenna is l, reception wavelength is λ, when l < λ/4, antenna shows capacitive, usual needs on the antenna showing capacitive series inductance to produce resonance, when l > λ/4, antenna shows perception, usually to need on the antenna showing perception series capacitance to produce resonance.Track lengths due to FM antenna needs to shorten as much as possible, to reduce to take up room, therefore FM antenna shows capacitive usually, needs series inductance.When selecting the series position of inductance, the load mode of inductance has bottom-loaded, middle part loads and top-loaded three kinds, each load mode has its merits and demerits, from the angle of machinery, bottom-loaded is ideal, but the radiation resistance of this load mode is very low and due to most of energy be radiate from loading coil, therefore efficiency comparison is low, the radiation resistance that middle part loads can increase, but resonance to be produced in this case and must have larger inductance, the position loaded more upwards, required inductance is larger, the antenna of top-loaded is more rare, this is because heavy inductance coil can make total become heavy, the mechanical strength of antenna is difficult to be guaranteed.From each because usually considering, the antenna that middle part loads is best, and during making, it is 10-30mm place that those inductance are arranged on apart from this feedback point track lengths.
Preferably, the inductance value of those inductance is 150-330nH.
Preferably, the track lengths in this plain conductor portion is less than 75 centimetres, and the trace width in this plain conductor portion is greater than 0.3mm.Because the trace width increasing antenna can reduce the resistance loss of antenna, and then increase received power and the signal bandwidth of antenna, therefore the trace width of FM antenna can not be too small, is generally greater than 0.3mm.
Preferably, this insulated substrate is a flexible PCB.
Preferably, this feedback point comprises the connecting portion of a rectangular portion and a circle, this rectangular portion and this connecting portion are all electrically connected with the one end in this plain conductor portion, and this connecting portion is covered in this rectangular portion, this plain conductor portion and this rectangular portion are printing Copper Foil, and the material of this connecting portion is copper, tin, gold or silver-colored.Because the conductivity of Jin Heyin is better, therefore connecting portion material select gold or silver-colored time, can improve FM antenna by feedback point by Received signal strength feed to the efficiency of the antenna-matching circuit of interior of mobile phone, therefore sensitivity is higher.
Preferably, those inductance adopt 0402 encapsulation or 0201 encapsulation.
Preferably, the outer surface uniform fold in this plain conductor portion has one for the protection of the glue-line in this plain conductor portion, and the thickness of this glue-line is 0.2-0.3mm.When making glue-line, 3M seccotine can be selected.
A kind of mobile phone, comprise a cell phone mainboard, this cell phone mainboard is provided with a frequency modulation chip and an antenna-matching circuit, its feature is, this cell phone mainboard is also provided with FM antenna as above.
Positive progressive effect of the present invention is:
The invention provides a kind of FM antenna.By at least one inductance of connecting on the wiring path in this plain conductor portion, the length in this plain conductor portion be contracted to receive wavelength four/for the moment, still can resonance Received signal strength preferably.The shortening in plain conductor portion reduces taking up room of this FM antenna, and therefore this FM antenna is provided with the function being arranged at interior of mobile phone, avoids and needs by the defect of extrapolation earphone as antenna.Present invention also offers a kind of mobile phone comprising this FM antenna.
Accompanying drawing explanation
Fig. 1 is the structural representation of the FM antenna of present pre-ferred embodiments.
Fig. 2 is the structural representation of the feedback point of FM antenna in Fig. 1.
Fig. 3 is the schematic diagram of the mobile phone of present pre-ferred embodiments.
Embodiment
Present pre-ferred embodiments is provided, to describe technical scheme of the present invention in detail below in conjunction with accompanying drawing.
As shown in Figure 1, the FM antenna A of the present embodiment comprises a flexible PCB 1, and presents point 2, one plain conductor portion 3, free end 4, this feedback point 2, this plain conductor portion 3 and this free end 4 are all positioned on the surface of this flexible PCB 1, and this feedback point 2 and this free end 4 lay respectively at the two ends in this plain conductor portion 3, this plain conductor portion 3 adopts the tortuous cabling mode of serpentine, and two inductance 5 that the wiring path in this plain conductor portion 3 is connected.Track lengths between two inductance and this feedback point is respectively 10mm and 30mm, the inductance value of two inductance is 200nH, when actual fabrication, those inductance 5 can also be series at other position of the wiring path in this plain conductor portion 3, and the inductance value of inductance also correspondingly can change according to the test value of the voltage standing wave ratio of FM antenna A (VSWR, Voltage Standing Wave Ratio).The track lengths in this plain conductor portion is 70 centimetres, and the trace width in this plain conductor portion 3 is 0.4mm.Those inductance adopt 0402 encapsulation, 0201 encapsulation that precision can certainly be adopted higher, and 0402 encapsulation and 0201 encapsulation all belong to prior art.
As shown in Figure 1-2, this feedback point 2 comprises the connecting portion 22 of a rectangular portion 21 and a circle, this rectangular portion 21 and this connecting portion 22 are all electrically connected with the one end in this plain conductor portion 3, and this connecting portion 22 is covered in this rectangular portion 21, this plain conductor portion 3 and this rectangular portion 21 are printing Copper Foil, can be one-body molded by the mode of operplate printing, the material of this connecting portion 22 is silver.
The outer surface in this plain conductor portion 3 usually needs evenly to apply a layer thickness when making and is 0.2-0.3mm and the glue-line with protective effect; this glue-line can not only prevent this plain conductor portion 3 from scratching; but also have and increase this plain conductor portion 3 and this flexible PCB 1 and to bond the function of fastness; at this flexible PCB 1 after repeatedly bending, this plain conductor portion 3 still can be bonded on this flexible PCB 1 securely.During making, glue can the commercially available 3M seccotine of choice for use.
As shown in Figure 3, the present embodiment additionally provides a kind of mobile phone, this mobile phone comprises mainboard on the other hand, this cell phone mainboard is provided with antenna-matching circuit 6, frequency modulation chip 7 and FM antenna A as above, this cell phone mainboard is also provided with one drive circuit 8 and a loud speaker 9.This FM antenna A, this antenna-matching circuit 6, this frequency modulation chip 7, this drive circuit 8 and this loud speaker 9 are electrically connected successively.
During use, this FM antenna A receives the electromagnetic wave signal of radiation in free space, and high frequency oscillating current is produced under the excitation of electromagnetic wave signal, then by this feedback point 2, high frequency oscillating current is transferred to this antenna-matching circuit 6, antenna-matching circuit 6 is for impedance matching, make the electromagnetic wave energy stored in antenna be delivered to this frequency modulation chip 7 efficiently, the electromagnetic wave frequency range sent due to FM radio station is 87.5MH
zto 108MH
z, the frequency range of voice signal is 20Hz to 20KHz, and therefore this frequency modulation chip 7 needs detection (or demodulation) from the electromagnetic wave signal received to go out voice signal.The voice signal exported due to this frequency modulation chip 7 detection is usually comparatively faint, therefore needs first to be amplified by this drive circuit 8, is then played back by this loud speaker 9.
Although the foregoing describe the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is defined by the appended claims.Those skilled in the art, under the prerequisite not deviating from principle of the present invention and essence, can make various changes or modifications to these execution modes, but these change and amendment all falls into protection scope of the present invention.
Claims (5)
1. a FM antenna, it comprises an insulated substrate, one feedback point and a plain conductor portion be electrically connected with this feedback point, this feedback point and this plain conductor portion are all arranged on the surface of this insulated substrate, it is characterized in that, the wiring path in this plain conductor portion to be connected at least one inductance, the track lengths in this plain conductor portion is less than 75 centimetres, the length of antenna is l, reception wavelength is λ, and l < λ/4, series connection two inductance on the wiring path in this plain conductor portion, this plain conductor portion adopts serpentine cabling, track lengths between those inductance and this feedback point is 10-30mm, and the trace width in this plain conductor portion is greater than 0.3mm,
This feedback point comprises the connecting portion of a rectangular portion and a circle; this rectangular portion and this connecting portion are all electrically connected with the one end in this plain conductor portion; and this connecting portion is covered in this rectangular portion; this plain conductor portion and this rectangular portion are printing Copper Foil; the material of this connecting portion is copper, tin, gold or silver-colored; the outer surface uniform fold in this plain conductor portion has one for the protection of the glue-line in this plain conductor portion, and the thickness of this glue-line is 0.2-0.3mm.
2. FM antenna as claimed in claim 1, it is characterized in that, the inductance value of those inductance is 150-330nH.
3. FM antenna as claimed in claim 1, it is characterized in that, this insulated substrate is a flexible PCB.
4. FM antenna as claimed in claim 1, is characterized in that, those inductance adopt 0402 encapsulation or 0201 encapsulation.
5. a mobile phone, comprises a cell phone mainboard, this cell phone mainboard is provided with a frequency modulation chip and an antenna-matching circuit, it is characterized in that, this cell phone mainboard is also provided with the FM antenna in claim 1-4 described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210103469.9A CN102664305B (en) | 2012-04-10 | 2012-04-10 | FM (frequency modulation) antenna and cellphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210103469.9A CN102664305B (en) | 2012-04-10 | 2012-04-10 | FM (frequency modulation) antenna and cellphone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102664305A CN102664305A (en) | 2012-09-12 |
| CN102664305B true CN102664305B (en) | 2015-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210103469.9A Active CN102664305B (en) | 2012-04-10 | 2012-04-10 | FM (frequency modulation) antenna and cellphone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI641184B (en) * | 2017-05-26 | 2018-11-11 | 碧中科技股份有限公司 | Fm antenna structure |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253918A (en) * | 2016-07-22 | 2016-12-21 | 深圳天珑无线科技有限公司 | Dust plug and signal processing method |
| CN106887683B (en) * | 2017-02-28 | 2020-10-09 | 杭州博联智能科技股份有限公司 | PCB printed board radio frequency antenna system based on single-live-wire radio frequency panel switch |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200987158Y (en) * | 2006-08-17 | 2007-12-05 | 德信无线通讯科技（北京）有限公司 | Mobile phone with radio function |
| CN102185177A (en) * | 2011-02-25 | 2011-09-14 | 中兴通讯股份有限公司 | Device for realizing frequency-modulated antenna and mobile terminal |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE602007010723D1 (en) * | 2007-02-28 | 2011-01-05 | Laird Technologies Ab | Antenna device and portable radio communication device with it |
| CN102386479B (en) * | 2011-10-21 | 2013-11-06 | 深圳市信维通信股份有限公司 | Mobile terminal, antenna device for mobile terminal and feed method |
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2012
- 2012-04-10 CN CN201210103469.9A patent/CN102664305B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200987158Y (en) * | 2006-08-17 | 2007-12-05 | 德信无线通讯科技（北京）有限公司 | Mobile phone with radio function |
| CN102185177A (en) * | 2011-02-25 | 2011-09-14 | 中兴通讯股份有限公司 | Device for realizing frequency-modulated antenna and mobile terminal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI641184B (en) * | 2017-05-26 | 2018-11-11 | 碧中科技股份有限公司 | Fm antenna structure |
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| CN102664305A (en) | 2012-09-12 |
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Address after: 201203 Shanghai city Pudong New Area Zhangjiang Keyuan Road No. 399 Building No. 1 Patentee after: HUAQIN TELECOM TECHNOLOGY Co.,Ltd. Address before: 201203 Shanghai city Pudong New Area Zhangjiang Keyuan Road No. 399 Building No. 1 Patentee before: SHANGHAI HUAQIN TELECOM TECHNOLOGY Co.,Ltd. |
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Address after: Building 1, No. 399 Keyuan Road, Zhangjiang hi tech park, Pudong New Area, Shanghai, 201203 Patentee after: Huaqin Technology Co.,Ltd. Address before: Building 1, No. 399 Keyuan Road, Zhangjiang hi tech park, Pudong New Area, Shanghai, 201203 Patentee before: Huaqin Technology Co.,Ltd. |
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Address after: Building 1, No. 399 Keyuan Road, Zhangjiang hi tech park, Pudong New Area, Shanghai, 201203 Patentee after: Huaqin Technology Co.,Ltd. Address before: 201203 Building 1, 399 Zhangyuan Road, Zhangjiang, Pudong New Area, Shanghai Patentee before: HUAQIN TELECOM TECHNOLOGY Co.,Ltd. |