CN201869246U - Mobile phone with built-in FM (frequency modulation) antenna - Google Patents
Mobile phone with built-in FM (frequency modulation) antenna Download PDFInfo
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- CN201869246U CN201869246U CN2010206225010U CN201020622501U CN201869246U CN 201869246 U CN201869246 U CN 201869246U CN 2010206225010 U CN2010206225010 U CN 2010206225010U CN 201020622501 U CN201020622501 U CN 201020622501U CN 201869246 U CN201869246 U CN 201869246U
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Abstract
The utility model discloses a mobile phone with a built-in FM (frequency modulation) antenna, which comprises a mobile phone housing and a mobile phone mainboard in the mobile phone housing; and an FM chip and an antenna matching circuit thereof are arranged on the mobile phone mainboard, wherein a first antenna body and a second antenna body which are annular are arranged on the mobile phone housing; and the first antenna body is arranged on the periphery of the second antenna body and connected with the antenna matching circuit via a transmission line. Due to the adoption of inductance coupling feeding structure, the second antenna body is used for feeding and exciting the first antenna body on the periphery of the second antenna body to radiate energy; simultaneously, through interaction of the two annular antennas, input impedance of an electrical small loop is close to characteristic impedance of a feeder, the matching difficulty of the FM antenna and the feeder is reduced, the structure of the built-in FM antenna is simplified, the impedance bandwidth of the antenna is increased, the performances of the FM antenna are upgraded under the same environmental conditions and the demand on FM transmission function can be satisfied.
Description
Technical field
The utility model relates to the field of mobile phones of band FM radio function, and in particular, what improvement related to is a kind of mobile phone of built-in FM antenna.
Background technology
Along with reducing of handset size, make that be used for launching/receive radio wave more and more receives much attention with the antenna assembly of transmission/exchange radio data, for example, the FM of FM receiver function on the mobile phone (Frequency Modulation, frequency modulation(FM)) antenna.The FM antenna so the size of corresponding antenna is bigger, often is difficult to be integrated in mobile phone inside because himself operating frequency is lower, usually all can be by means of the ground wire of the earphone portion antenna as FM.
In recent years, the design of FM built-in aerial also draws attention gradually, some built-in FM antennas also occurred, for example, and ceramic antenna.It utilizes the ceramic material of high-k, reduces the operation wavelength of FM frequency range, and then reaches the purpose of dwindling the FM antenna size.
Yet the ceramic material of high-k has also dwindled the bandwidth of operation of antenna simultaneously, and ceramic antenna has the profile of cuboid usually, is difficult to satisfy the changeable mobile phones design needs of external form.
Also have a kind of electric tuning antenna in the prior art, adjust the antenna resonance frequency by automatic match circuit, need software and hardware to cooperate simultaneously when work, design is comparatively complicated, and cost of manufacture is higher.
Therefore, prior art still haves much room for improvement and develops.
The utility model content
The purpose of this utility model is, a kind of mobile phone of built-in FM antenna is provided, and can realize to satisfy the built-in FM antenna of the changeable designing requirement of its external form on mobile phone at low cost.
The technical solution of the utility model is as follows: a kind of mobile phone of built-in FM antenna comprises phone housing and inner cell phone mainboard thereof; FM chip and antenna-matching circuit thereof are set on the cell phone mainboard; Wherein: first antenna body and second antenna body that annular is set on phone housing; First antenna body is arranged on the periphery of second antenna body, and is connected with antenna-matching circuit through transmission line.
The mobile phone of described built-in FM antenna, wherein: first antenna body is set to the loop configuration of single-turn or multi-turn.
The mobile phone of described built-in FM antenna, wherein: first antenna body is around the edge setting of phone housing.
The mobile phone of described built-in FM antenna, wherein: the length of first antenna body is set to the integral multiple of mobile phone girth.
The mobile phone of described built-in FM antenna, wherein: the total length of first antenna body is set to 1/10th of FM place band wavelength.
The mobile phone of described built-in FM antenna, wherein: first antenna body and second antenna body are arranged in the same plane.
The mobile phone of described built-in FM antenna, wherein: first antenna body and second antenna body are set to paste or flexible printed circuit board or the sheet metal of welding on phone housing.
The mobile phone of described built-in FM antenna, wherein: first antenna body and second antenna body are set to apply or electroplate the metal level on phone housing.
The mobile phone of described built-in FM antenna, wherein: transmission line is set to metal clips or metal ferrule.
The mobile phone of a kind of built-in FM antenna provided by the utility model, owing to adopted the structure of inductance coupling high feed, the second antenna body feed also encourages the first antenna body emittance of its periphery, interaction by two loop aerials, make the input impedance of electric little ring near the characteristic impedance of feeder line, reduced the difficulty of matching of FM antenna and feeder line, simplified the structure of built-in FM antenna, increased the impedance bandwidth of antenna, promote the performance of FM antenna under the same environmental condition, satisfied the demand of FM emission function.
Description of drawings
Fig. 1 is the built-in FM antenna structure view of the utility model mobile phone.
Embodiment
Below with reference to accompanying drawing, embodiment of the present utility model and embodiment are described in detail, described specific embodiment in order to explain the utility model, is not to be used to limit embodiment of the present utility model only.
The mobile phone of a kind of built-in FM antenna of the present utility model, one of its embodiment, as shown in Figure 1, comprise phone housing 200, cell phone mainboard 100, FM chip 110, antenna-matching circuit 120, first antenna body 220, second antenna body 210 and transmission line 230; Cell phone mainboard 100 is positioned at phone housing 200; FM chip 110 and antenna-matching circuit 120 thereof are arranged on the cell phone mainboard 100; First antenna body 220 and second antenna body 210 are loop aerial; First antenna body 220 is arranged on the periphery of second antenna body 210, and is connected with antenna-matching circuit 120 through transmission line 230.The concrete shape and the number of turns of loop aerial are unrestricted, all can form the FM antenna with inductance coupling high feed structure.
Based on the mobile phone of above-mentioned built-in FM antenna, the utility model has also proposed a kind of method that realizes built-in FM antenna on mobile phone, may further comprise the steps:
Carry out feed by the FM chip 110 and the antenna-matching circuit 120 thereof that are arranged on the cell phone mainboard 100 via second antenna body 210 that 230 pairs of transmission lines are arranged on the phone housing 200;
Compare with the mobile phone of built-in FM antenna in the prior art, the implementation method of built-in FM antenna provided by the utility model and mobile phone thereof, owing to adopted the structure of inductance coupling high feed, second antenna body, 210 feeds also encourage first antenna body, 220 emittance of its periphery, interaction by two loop aerials, make the input impedance of electric little ring near the characteristic impedance of feeder line, reduced the difficulty of matching of FM antenna and feeder line, simplified the structure of built-in FM antenna, increased the impedance bandwidth of antenna, promote the performance of FM antenna under the same environmental condition, satisfied the demand of FM emission function.
Further, first antenna body 220 can be set to the loop configuration of single-turn or multi-turn, and promptly big ring can be the individual pen structure, also can be the above multi-turn structures of two circles.
Be preferably, first antenna body 220 can be around the edge setting of phone housing 200.
Concrete, for first antenna body 220 of individual pen loop configuration, the length of first antenna body 220 substantially can be according to the length setting of mobile phone girth; And for first antenna body 220 with multi-ring annular structure, the length of first antenna body 220 can be according to the integral multiple setting of mobile phone girth.
In the preferred implementation of the mobile phone of the built-in FM antenna of the utility model, as shown in Figure 1, built-in FM antenna body comprises big ring and two loop antennas of little ring, little ring places in the big ring, or big ring places outside the little ring, little ring encourages the outer big ring of little ring by transmission line 230 feeds by inductance coupling high, big hoop external radiation energy.Adopt the electromagnetic coupled feed structure, by little ring excitation one a big loop antenna, simplified the coupling of FM antenna and feeder line, the coupling bandwidth is improved, and promptly in limited space, promotes the performance of FM antenna.Antenna form and match circuit are simple, have reduced design complexities.
Preferably, the total length of first antenna body 220 can be set to about 1/10th of FM place band wavelength.Theoretically, total length is no more than quarter-wave loop aerial and is called electric little loop antenna, yet, the impedance of the little loop antenna of electricity often presents bigger inductive reactance and less resistance, the impedance of high like this Q value, make matching Design become very difficult, and also limited the impedance bandwidth of antenna.But, inductance coupling high feed by second antenna body 210, under big ring and two loop aerials interactions of little ring, causing big ring is that the input impedance of electric little ring is improved, thereby and, make feed to big ring become and be more prone to that the bandwidth of coupling is improved near the characteristic impedance of feeder line, under same environment, built-in FM antenna of the present utility model can obtain more performance.
Preferably, first antenna body 220 and second antenna body 210 can be arranged in the same plane.
Concrete, first antenna body 220 and second antenna body 210 can be set to paste or flexible printed circuit board or the sheet metal of welding on phone housing 200.
Concrete, first antenna body 220 and second antenna body 210 can be set to apply or electroplate the metal level on phone housing 200.
Concrete, transmission line 230 can be set to metal clips or metal ferrule.
The mobile phone of the built-in FM antenna of the utility model adopts the electromagnetic coupled feed structure, by the radiation of little ring excitation one a big loop antenna, has simplified the coupling of FM antenna and feeder line, realized a kind of simple in structure, impedance matching makes things convenient for, can be built in the FM antenna of mobile phone.The FM antenna itself is easy to make, can be planar structure,, stick on the battery bonnet or on the casing by adopting FPC (flexible printed circuit board) or sheet metal as antenna radiator, also the available metal coating is electroplated on casing, is easy to match with the cell phone appearance design.And be connected with mainboard with the form of metal clips or contact pin, then by the feed end of FM antenna matching network, be connected to the reception or the transmitting terminal of FM chip 110 again.The simplicity of design of whole match circuit had both been saved the PCB area of mobile phone, had saved the development time again, flexible design degree height.In limited space, improved the performance of built-in FM antenna, high-quality FM antenna be built in the mobile phone, on mobile phone, realized wireless outside playing function, satisfied the demand of FM emission function simultaneously, realized the transmit-receive sharing of FM antenna.
Should be understood that; the above only is preferred embodiment of the present utility model; be not sufficient to limit the technical solution of the utility model; for those of ordinary skills; within spirit of the present utility model and principle; can be increased and decreased according to the above description, replacement, conversion or improvement; for example; that the shape of loop aerial can comprise is square, triangle, circle, ellipse etc.; and all these increases and decreases, replacement, conversion or improve after technical scheme, all should belong to the protection range of the utility model claims.
Claims (9)
1. the mobile phone of a built-in FM antenna comprises phone housing and inner cell phone mainboard thereof; FM chip and antenna-matching circuit thereof are set on the cell phone mainboard; It is characterized in that: first antenna body and second antenna body that annular is set on phone housing; First antenna body is arranged on the periphery of second antenna body, and is connected with antenna-matching circuit through transmission line.
2. the mobile phone of built-in FM antenna according to claim 1 is characterized in that: first antenna body is set to the loop configuration of single-turn or multi-turn.
3. the mobile phone of built-in FM antenna according to claim 1 is characterized in that: first antenna body is around the edge setting of phone housing.
4. the mobile phone of built-in FM antenna according to claim 1 is characterized in that: the length of first antenna body is set to the integral multiple of mobile phone girth.
5. the mobile phone of built-in FM antenna according to claim 1 is characterized in that: the total length of first antenna body is set to 1/10th of FM place band wavelength.
6. the mobile phone of built-in FM antenna according to claim 1 is characterized in that: first antenna body and second antenna body are arranged in the same plane.
7. the mobile phone of built-in FM antenna according to claim 1 is characterized in that: first antenna body and second antenna body are set to paste or flexible printed circuit board or the sheet metal of welding on phone housing.
8. the mobile phone of built-in FM antenna according to claim 1 is characterized in that: first antenna body and second antenna body are set to apply or electroplate the metal level on phone housing.
9. the mobile phone of built-in FM antenna according to claim 1 is characterized in that: transmission line is set to metal clips or metal ferrule.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206225010U CN201869246U (en) | 2010-11-24 | 2010-11-24 | Mobile phone with built-in FM (frequency modulation) antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206225010U CN201869246U (en) | 2010-11-24 | 2010-11-24 | Mobile phone with built-in FM (frequency modulation) antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201869246U true CN201869246U (en) | 2011-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206225010U Expired - Fee Related CN201869246U (en) | 2010-11-24 | 2010-11-24 | Mobile phone with built-in FM (frequency modulation) antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201869246U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102014180A (en) * | 2010-11-24 | 2011-04-13 | 惠州Tcl移动通信有限公司 | Built-in FM antenna realization method and mobile phone using same |
-
2010
- 2010-11-24 CN CN2010206225010U patent/CN201869246U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102014180A (en) * | 2010-11-24 | 2011-04-13 | 惠州Tcl移动通信有限公司 | Built-in FM antenna realization method and mobile phone using same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110615 Termination date: 20131124 |