CN101465476B - Built-in antenna - Google Patents
Built-in antenna Download PDFInfo
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- CN101465476B CN101465476B CN 200710162157 CN200710162157A CN101465476B CN 101465476 B CN101465476 B CN 101465476B CN 200710162157 CN200710162157 CN 200710162157 CN 200710162157 A CN200710162157 A CN 200710162157A CN 101465476 B CN101465476 B CN 101465476B
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Abstract
The invention relates to a built-in antenna which is applied to a DVB-H system, comprising a first monopole radiating part, a second monopole radiating part and a signal feed-in section; the first monopole radiating part is provided with a first end, a second end which is far away from the first end and a first twisted radiating section for connecting the first end and the second end; the structure of the second monopole radiating part is similar to the structure of the first monopole radiating part, and the first monopole radiating part is adjacent to and symmetrical to one straight line; the second monopole radiating part is provided with a third end, a fourth end which is far away from the third end, and a second twisted radiating section for connecting the third end and the fourth end; the signal feed-in section is connected between the first end and the third end. The antenna has the advantages of small volume, wide over frequency, high efficiency and simple design structure and the like.
Description
Technical field
The invention relates to a kind of built-in antenna, refer to especially a kind of built-in antenna that is applied to handheld digital video broadcasting (DVB-H).
Background technology
Europe digital video broadcasting development institution (Digital Video Broadcasting Project; DVB), in order to realize the future trend of mobile rating, with original digital video broadcast-terrestrial (DVB-T; DVB-Terrestrial) transmission technical standard is the basis, proposes " handheld digital video broadcasting " (DVB-H; DVB-Handheld) technical specification, and in February, 2004 DVB Project announce the specification institution work of completing DVB-H.The functions such as this DVB-H technology can satisfy that the required low-power consumption of handheld apparatus, high mobility (easily receiving), shared platform and networking handed over service are not interrupted, can by the integration of mobile communication network and DVB-H broadcasting network, provide the user more diversified content and interactive service future.
Consult Fig. 1, antenna frame shown in figure is the DVB-H antenna 10 that U.S.'s publication proposes for No. US20060214857A1, the feed-in wire 12 that antenna 10 has inverted-L antenna Department of Radiation 11 and is connected with Department of Radiation 11, the other end of feed-in wire 12 is connected to match circuit 13, and the rear end of match circuit 13 is connected to other RF circuit 14.Except Department of Radiation 11, another three elements all are arranged on operplate printing circuit board 15.
Summary of the invention
Therefore, purpose of the present invention, namely a kind of volume is little, efficient is good and the simple DVB-H built-in antenna of project organization providing.
The present invention proposes a kind of built-in antenna, comprises the first monopole radiation section, the second monopole radiation section and a signal feed-in section.
The first monopole radiation section has first end, away from the second end of first end, and connect the first tortuous radiant section of first end and this second end.
The structural similarity of the second monopole radiation section is in the first monopole radiation section, and be close to the first monopole radiation section and be symmetrical in a straight line, the second monopole radiation section has the 3rd end, away from the 4th end of the 3rd end, and connect the second tortuous radiant section of the 3rd end and the 4th end.
Signal feed-in section is to be connected in first end and the 3rd end.
Description of drawings
Fig. 1 is a stereogram, and the structure of traditional DVB-H antenna is described;
Fig. 2 is a stereogram, illustrates that the first preferred embodiment of built-in antenna of the present invention is arranged at an insulation shell;
Fig. 3 is a stereogram, illustrates that this first preferred embodiment is arranged at this insulation shell;
Fig. 4 is the front elevation that the built-in antenna of the present embodiment is launched into a plane, and the structure of the preferred embodiment is described;
Fig. 5 is a schematic diagram, and the structure of an impedance matching circuit is described;
Fig. 6 is a schematic diagram, illustrate this impedance matching circuit be arranged at a microwave base plate and with the situation that is connected of a signal feed-in section;
Fig. 7 is the measurement result figure of the voltage standing wave ratio (VSWR) of this preferred embodiment;
Fig. 8 is the Smith chart of this preferred embodiment;
Fig. 9 is the measurement result figure of the gain (GAIN) of this preferred embodiment;
Figure 10 is radiation pattern (Radiation Pattern) figure of this preferred embodiment when frequency is 650MHz; And
Figure 11 is the front elevation that the built-in antenna of the second preferred embodiment is launched into a plane, and the structure of the preferred embodiment is described.
The main element symbol description
2 built-in antennas
3 first monopole radiation sections
31 first ends
32 second ends
4 second monopole radiation sections
41 the 3rd ends
42 the 4th ends
5 signal feed-in sections
6 first tortuous radiant sections
61 first line segments
62 second line segments
63 the 3rd line segments
64 the 4th line segments
65 the 5th line segments
7 second tortuous radiant sections
71 the 6th line segments
72 the 7th line segments
73 the 8th line segments
74 the 9th line segments
75 the tenth line segments
8 impedance matching circuits
81 electric capacity
82 inductance
83 holding wires
84 microwave base plates
91 insulating bodies
92 first surfaces
93 second
94 the 3rd
95 fourth faces
The L straight line
Embodiment
About aforementioned and other technology contents, characteristics and effect of the present invention, in the detailed description of following cooperation with reference to two preferred embodiments of accompanying drawing, can clearly present.
Before the present invention is described in detail, be noted that in the following description content, similarly element is to represent with identical numbering.
Consult Fig. 2 and Fig. 3, the first preferred embodiment of built-in antenna 2 of the present invention is to be built in the portable electric devices such as mobile phone, PDA, its working frequency range is the 470MHz～862MHz that requires meeting DVB-H, and for area occupied is dwindled, be that built-in antenna 2 is designed to three-dimensional pattern in the present embodiment, yet, it can also the plane pattern exist, as shown in Figure 4, and its structure for convenience of description, below first the pattern with the plane explain.
Consult Fig. 4, built-in antenna 2 comprises the first monopole radiation section 3, the second monopole radiation section 4 and signal feed-in section 5.
The first monopole radiation section 3 has first end 31, the second ends 32 and is connected to the first tortuous radiant section 6 at these two ends.
The first tortuous radiant section 6 comprises that the 3rd line segment 63 that the end of the first line segment 61 that is extended by first end 31, first line segment 61 that continues extends to the end of the second line segment 62 of downward-extension, second line segment 62 that continues, the end of the 3rd line segment 63 that continues extend to the 5th line segment 65 of the second end 32 left to the end of the 4th line segment 64 of downward-extension, the 4th line segment 64 that continues left to the right.
The structure similar to above-mentioned the first monopole radiation section 3, the second monopole radiation section 4 also has the 3rd end 41, the 4th end 42 and is connected to the second tortuous radiant section 7 at these two ends.It is worth mentioning that, the second monopole radiation section 4 is close to the first monopole radiation section 3 and is symmetrical in straight line L.
The tortuous radiant section 6 of the structure also with the first of the second tortuous radiant section 7 is similar, the 7th line segment 72 that comprises the 6th line segment 71 that extended by the 3rd end 41 left, extended towards straight line L direction by the 6th line segment 71 ends, the 9th line segment 74 that is extended towards straight line L direction towards the 8th line segment 73 of right extension, by the 8th line segment 73 ends by the 7th line segment 72 ends, and extended to the tenth line segment 75 of the 4th end 42 by the 9th line segment 74 ends.
What further illustrate is, the second end 32 and the 4th end 42 are contiguous straight line L, and first end 31 and the 3rd end 41 are away from this straight line L, and signal feed-in section 5 is to be connected in first end 31 and the 3rd end 41.
Preferred, first and third, five, six, eight, ten line segments 61, the 63,65,71,73, the 75th are parallel to this straight line L; The second, four, seven, nine line segments 62,64,72,74 and signal feed-in section 5 be vertical with this straight line L.Three, five, eight, ten line segments 63,65,73,75 isometric each other, second, four, seven, nine line segments 62,64,72,74 are isometric wide each other, and the first line segment 61 grades are longer than the 6th line segment 71; It should be noted that the 5th line segment 65 and both width of the tenth line segment 75 are to be wide than other line segment, and when both spacing during less than 3mm, preferred to the lifting effect of gain.
Coordinate and to consult Fig. 2 and Fig. 3, as shown in the figure, the first monopole radiation section 3, the second monopole radiation section 4 and signal feed-in section 5 are arranged on the surface of insulating body 91 of cuboid bendingly.Wherein, first and third line segment 61, the 63rd is positioned on the first surface 92 of insulating body 91, the 5th line segment 65 is to extend to second 93 of insulating body 91 by first surface 92, the tenth line segment 75 and the 5th line segment 65 spacing ground that is separated by is positioned at second 93, and signal feed-in section 5 is that the 3rd 94 by insulating body 91 extends to fourth face 95; Second 93 is parallel across first surface 92 each other with the 3rd 94, and all is vertically connected at first surface 92, and fourth face 95 and another three equal vertical being connected.(consider owing to arranging easily, some line segments are not to be straight as the plane graph of Fig. 4, but tortuous slightly again, as the first line segment 61, signal feed-in section 5, this does not depart from concept of the present invention, sets off out on the contrary design diversity provided by the present invention)
Consult Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, when designing this built-in antenna 2, can first design center frequency be about 600MHz, the first monopole radiation section 3 of 1/4 wavelength, design again and first monopole radiation section's 3 structural similarities and symmetrical the second monopole radiation section 4, built-in antenna 2 is connected and adjusts in the impedance matching circuit 8 of signal feed-in section 5, so that can be operated in the DVB-H frequency band.Impedance matching circuit 8 comprises electric capacity 81 and inductance 82, and electric capacity 81 is to be connected between the anode and signal feed-in section 5 of holding wire 83, and inductance 82 is to be connected in signal feed-in section 5 and an earth terminal.In this preferred embodiment, the value of electric capacity is 4.7pF, and the value of inductance is 15nH.As shown in Figure 6, impedance matching circuit 8 is to be arranged at microwave base plate 84 (it is the FR4 material), the long 90mm of microwave base plate 84, wide 40mm, high 0.8mm, and the long 40mm of insulating body 91, the wide 8mm, the high 15mm that supply antenna to arrange.
Consult Fig. 7, this figure is voltage standing wave ratio (VSWR) measured value of built-in antenna 2, by finding out in figure, can improve voltage standing wave ratio by impedance matching circuit 8, improves into (b) curve by (a) curve.Smith (smith) figure by Fig. 8 also can find out again, has (b) figure measurement result of impedance matching circuit 8 not have (a) figure of impedance matching circuit 8 preferred.
In addition, Fig. 9 is the gain diagram of this built-in antenna 2, as can be seen from Figure, the gain curve that built-in antenna 2 improves via impedance matching circuit 8 (a) meets the gain specification (b) that European ICT (information and communication technology) association (European Information and Communication Technology Association is called for short EICTA) formulates.And Figure 10 is radiation pattern (RadiationPattern) figure of built-in antenna 2, and the frequency of Figure 10 is 650MHz.
Figure 11 is the second preferred embodiment of built-in antenna 2 of the present invention, itself and the first preferred embodiment (Fig. 4) structural similarity, difference is that the end of its 5th line segment 65 is first end 31, the end of the tenth line segment 75 is the 3rd end 41, and being positioned at the first line segment 61, the four ends 42, the second end 32 is positioned at the 6th line segment 71, so, first end 31 and the 3rd end 41 are contiguous straight line L, and the second end 32 and the 4th end 42 are away from straight line L.Therefore, the signal feed-in section 5 of the second preferred embodiment is shorter, and slightly T-shaped; In addition, the length of the first line segment 61, the 6th line segment 71 is also shorter than the first preferred embodiment.Other impedance matching circuit 8, insulating body 91 is general similar to the first preferred embodiment, therefore do not repeat them here.
What will further illustrate at last is, each line segment of built-in antenna 2 of the present invention (comprising signal feed-in section 5) is all parallel or vertical each other, yet those skilled in the art, when one of them deflection that can make each line segment is not parallel or vertical, and reaching identical effect, this should still belong to the scope that the present invention is contained.
In sum, the present invention dwindles the volume of antenna by the mode of bending, make antenna can be applicable to the electronic installations such as mobile phone, PDA, recycle the first monopole radiation section 3 and the 4 symmetrical structures designs of the second monopole radiation section, and the modulation of impedance matching circuit 8 makes built-in antenna 2 can be operated in the DVB-H frequency band, and have the advantages such as overclocking is wide, efficient is good, project organization is simple, therefore really can reach purpose of the present invention.
The above person is only the preferred embodiments of the present invention, and when not limiting scope of the invention process with this, the simple equivalence of namely generally doing according to content of the present invention changes and modifies, and all still belongs in scope of the present invention.
Claims (11)
1. built-in antenna comprises:
One first monopole radiation section, have a first end, away from one second end of this first end, and connect one first tortuous radiant section of this first end and this second end;
One second monopole radiation section, structural similarity is in this first monopole radiation section, and section is close to and is symmetrical in a straight line with this first monopole radiation, has one the 3rd end, away from one the 4th end of the 3rd end, and connects one second tortuous radiant section of the 3rd end and the 4th end; And
One signal feed-in section is connected in this first end and the 3rd end,
Contiguous this straight line of this second end and the 4th end wherein, this first end and the 3rd end be away from this straight line,
Wherein this first tortuous radiant section comprises one second line segment that extends towards this rectilinear direction by outward extending one first line segment of this first end, by this first line segment end, one the 3rd line segment that extended towards this first end direction by this second line segment end, one the 4th line segment that is extended towards this rectilinear direction by the 3rd line segment end, and is extended to one the 5th line segment of this second end by the 4th line segment end.
2. built-in antenna according to claim 1, wherein this second tortuous radiant section comprises one the 7th line segment that extends towards this rectilinear direction by outward extending one the 6th line segment of the 3rd end, by the 6th line segment end, one the 8th line segment that extended towards the 3rd extreme direction by the 7th line segment end, one the 9th line segment that is extended towards this rectilinear direction by the 8th line segment end, and is extended to 1 the tenth line segment of the 4th end by the 9th line segment end.
3. built-in antenna according to claim 2, wherein this first and third, five, six, eight, ten line segment is parallel to each other or make one of them deflection not be parallel; And this second, four, seven, nine line segment is vertical with this straight line or make one of them deflection not be vertical.
4. built-in antenna according to claim 3, wherein, the 5th line segment and the tenth line segment spacing each other are less than 3mm.
5. built-in antenna comprises:
One first monopole radiation section, have a first end, away from one second end of this first end, and connect one first tortuous radiant section of this first end and this second end;
One second monopole radiation section, structural similarity is in this first monopole radiation section, and section is close to and is symmetrical in a straight line with this first monopole radiation, has one the 3rd end, away from one the 4th end of the 3rd end, and connects one second tortuous radiant section of the 3rd end and the 4th end; And
One signal feed-in section is connected in this first end and the 3rd end,
Wherein, contiguous this straight line of this first end and the 3rd end, this second end and the 4th end be away from this straight line,
Wherein this first tortuous radiant section comprises one second line segment that extends towards this rectilinear direction by outward extending one first line segment of this first end, by this first line segment end, one the 3rd line segment that extended towards this first end direction by this second line segment end, one the 4th line segment that is extended towards this rectilinear direction by the 3rd line segment end, and is extended to one the 5th line segment of this second end by the 4th line segment end.
6. built-in antenna according to claim 5, wherein this second tortuous radiant section comprises one the 7th line segment that extends towards this rectilinear direction by outward extending one the 6th line segment of the 3rd end, by the 6th line segment end, one the 8th line segment that extended towards the 3rd extreme direction by the 7th line segment end, one the 9th line segment that is extended towards this rectilinear direction by the 8th line segment end, and is extended to 1 the tenth line segment of the 4th end by the 9th line segment end.
7. built-in antenna according to claim 6, wherein this first and third, five, six, eight, ten line segment is parallel to each other or make one of them deflection not be parallel; This second, four, seven, nine line segment is vertical with this straight line or make one of them deflection not be vertical.
8. built-in antenna according to claim 1, more comprise an impedance matching circuit that is connected in this signal feed-in section, in order to match with this second monopole radiation section with this first monopole radiation section, so that built-in antenna can be operated in the DVB-H frequency band.
9. built-in antenna according to claim 8, wherein this impedance matching circuit comprises an electric capacity and an inductance, one end of this electric capacity is connected to the anode of a holding wire, the other end of this electric capacity is connected to this signal feed-in section, one end of this inductance connects this signal feed-in section, the other end ground connection of this inductance.
10. built-in antenna according to claim 1, wherein this first monopole radiation section, this second monopole radiation section and this signal feed-in section are arranged at the insulating body surface of a solid bendingly.
11. built-in antenna according to claim 1, this built-in antenna is applied to handheld electronic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710162157 CN101465476B (en) | 2007-12-21 | 2007-12-21 | Built-in antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710162157 CN101465476B (en) | 2007-12-21 | 2007-12-21 | Built-in antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101465476A CN101465476A (en) | 2009-06-24 |
| CN101465476B true CN101465476B (en) | 2013-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710162157 Expired - Fee Related CN101465476B (en) | 2007-12-21 | 2007-12-21 | Built-in antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101465476B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104425888B (en) * | 2013-08-30 | 2019-11-22 | 深圳富泰宏精密工业有限公司 | Antenna structure and wireless communication device with the antenna structure |
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2007
- 2007-12-21 CN CN 200710162157 patent/CN101465476B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN101465476A (en) | 2009-06-24 |
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Granted publication date: 20130508 Termination date: 20211221 |
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| CF01 | Termination of patent right due to non-payment of annual fee |