CN1264371C - Folding double frequency monopolar antenna - Google Patents
Folding double frequency monopolar antenna Download PDFInfo
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- CN1264371C CN1264371C CNB021277346A CN02127734A CN1264371C CN 1264371 C CN1264371 C CN 1264371C CN B021277346 A CNB021277346 A CN B021277346A CN 02127734 A CN02127734 A CN 02127734A CN 1264371 C CN1264371 C CN 1264371C
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- radiant body
- antenna
- frequency
- double frequency
- folding double
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- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 239000004020 conductor Substances 0.000 claims abstract description 20
- 238000007639 printing Methods 0.000 claims abstract description 6
- 238000005516 engineering process Methods 0.000 claims description 9
- 239000003989 dielectric material Substances 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 4
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 8
- 238000013461 design Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 3
- 230000005404 monopole Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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Abstract
The present invention relates to a folding double frequency monopolar antenna which comprises a radiator, a transmission line and a conductor, wherein the radiator resonates with a first operation frequency and a second operation frequency and is connected with the transmission line through the conductor; the radiator has a first side edge and a second side edge opposite to each other, and a plurality of staggered slots are arranged on the first side edge and the second side edge so that the radiator has a serpentine belt external appearance. What is important is that the radiator is folded into a column structure in the extension direction of the slots so as to reduce the size of the radiator; in making method, a printing technique can be utilized to coat the radiator on the surface of a columnar medium; the size of the radiator can be effectively reduced, and the structural strength of the radiator can be further raised.
Description
Technical field
The invention relates to a kind of dual-band antenna, and particularly relevant for a kind of folding double frequency antenna.
Background technology
Wireless technology is maked rapid progress in recent years, and relevant mobile communication product is also popularized each corner in the world with surprising rapidity.With the mobile phone is example, compact and good communication quality still is the necessary condition of outstanding machine, for on market with keen competition, showing one's talent excellent dual frequency characteristics, small and exquisite outward appearance and low production cost, the significant consideration when just becoming each related elements of design.
The employed antenna of conventional mobile phone mostly is one pole (monopole) antenna that exposes straight formula, and its shortcoming is that antenna height is too high, except that carrying inconvenience, also colludes attached his thing easily and causes and lose.Moreover, because the cost of manufacture of traditional exposed unipole antenna is higher, and designs in the complex structure of double frequency or multi-band operation, thus on compact mobile phone products the difficult space that application is arranged.
Summary of the invention
In view of this, purpose of the present invention is exactly in that a kind of folding double frequency monopolar antenna is provided, and to dwindle antenna size, except beautifying product appearance, still can protect antenna, improves the reliability of product.
According to purpose of the present invention, a kind of folding double frequency monopolar antenna is proposed, being summarized as follows of this device:
Folding double frequency monopolar antenna can comprise radiant body, transmission line and conductor, but radiant body resonance and sees through conductor and is connected with transmission line in first frequency of operation and second frequency of operation.Radiant body has relative first side and second side, and several otch that are crisscross arranged on first and second side, makes radiant body have sinuous banded outward appearance.In addition, radiant body also is provided with load point defining first and second current path, the length of first current path be about first frequency of operation institute corresponding wavelength 1/4, the second current path about second frequency of operation of length institute corresponding wavelength 1/4.Importantly, radiant body is that the bearing of trend along otch is folded into column structure, to dwindle the size of radiant body.On the practice, also can utilize printing technology that radiant body is coated on the surface of column dielectric material, the size of radiant body can more effectively be dwindled, and further promote the structural strength of radiant body.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1, a kind of radiant body schematic diagram that provides according to a preferred embodiment of the present invention is provided for it.
Fig. 2 A～2C is depicted as the folding process schematic diagram of radiant body among Fig. 1.
Figure 3 shows that the situation that is connected of radiant body and transmission line.
Fig. 4 A is depicted as radiant body and conductor is integrally formed.
Fig. 4 B is depicted as the situation of radiant body after folding of Fig. 4 A.
Figure 5 shows that the measurement result of returning loss (return loss).
Fig. 6 A is depicted as the antenna gain measurement result of antenna in the GSM frequency band.
Fig. 6 B is depicted as the antenna gain measurement result of antenna in the DCS frequency band.
Fig. 7 A is depicted as the current path method of adjustment schematic diagram of radiant body.
Fig. 7 B is depicted as the situation of radiant body after folding of Fig. 7 A.
Label declaration
11,12,13: otch
21,22,23: broken line
31: microstrip line
33,43: conductor
71,73: openend
100: radiant body
301: low frequency operation mode
302: high-frequency operation mode
400,700: radiant body
F: load point
L1, L2: current path
Embodiment
The primary structure of antenna is transmission line and radiant body, and transmission line is in order to transmission signals, and radiant body then resonance makes antenna can operate in one or more frequency in some special frequency band.Please refer to Fig. 1, a kind of radiant body schematic diagram that provides according to a preferred embodiment of the present invention is provided for it.The sheet metal that can utilize rectangle is as radiant body 100, and in the limit, left side of the relative dual-side of radiant body 100-for example and right edge several otch that are crisscross arranged, otch 11 for example on the limit, 13 and right edge on otch 12 etc., these otch can be parallel to each other, and the similar sinuous band shape of external form that makes radiant body 100 is with minification.If the load point F of aerial signal is arranged on the lower right corner of radiant body 100, just can on radiant body 100, define different current path L1 of length and current path L2.Because the length of current path L1 is shorter than current path L2, but so current path L1 resonance in higher frequency, current path L2 then resonance makes radiant body 100 satisfy the design requirement of dual frequency operation in lower frequency.
The characteristic of unipole antenna is 1/4 length of resonance in frequency of operation institute corresponding wavelength, can operate in GSM (890～960MHz) and DCS (1710～1880MHz) two frequency bands if wish antenna, when design, can select 900MHz and 1800MHz as frequency of operation, and according to these two pairing wavelength of frequency design current path L1 and the due length of current path L2 (length of current path L1 is about 1/4 of 1800MHz institute corresponding wavelength, the length of current path L2 be about 900MHz institute corresponding wavelength 1/4).In order to allow the volume of radiant body 100 further dwindle, radiant body 100 can be folded into three-dimensional column structure.Though the radiant body after folding will increase some height, very considerable because of the area that folding back is saved, the overall interests after these those length that disappear are still very outstanding.
Then please refer to Fig. 2 A, its broken line that is depicted as radiant body 100 is provided with situation.One broken line can be set along the bearing of trend of each otch, for example broken line 21-21, broken line 22-22 and broken line 23-23 etc., along broken line radiant body 100 is folded (being depicted as Fig. 2 B) then, to form three-dimensional rectangle column structure (being depicted as) as Fig. 2 C.Certainly, directly radiant body 100 is not curled into the circular cylindrical shape structure, also can reaches the purpose of minification if tangible broken line is not set.
With regard to present technical merit, can utilize printing technology to form pattern (pattern), so the radiant body that embodiments of the present invention must not need to produce sheet earlier is folded into column again on the surface of dielectric material.Another kind of feasible mode is earlier dielectric material to be processed as rectangle column or cylindric, radiant body is utilized printing technology to be coated on the surface of dielectric material again, can reach the effect that folds radiant body equally.On using, can select for use ceramic material to be formed at the surface as medium and with radiant body, if it is right, radiant body promptly has suitable structural strength, and can the radiant body size more effectively be dwindled by the high-dielectric coefficient (dielectric constant) of ceramic material.
Please refer to Fig. 3, it is depicted as the situation that is connected of radiant body and transmission line.In microwave circuit, there are many structures all to can be used as transmission line, for example microstrip line (microstrip line), co-plane waveguide (coplanarwaveguide, CPW) and coaxial cable (coaxial cable) etc., in graphic be with microstrip line 31 as an example of transmission line so that it to be described.Because radiant body 100 is unipole antennas, influence the radiation effect of radiant body 100 for fear of the ground plane of microstrip line 31 bottoms, in fact can utilize the conductor 33 of suitable length to connect load point and microstrip line 31, radiant body 100 and ground plane are separated, with the performance optimum efficiency.It should be noted that the present invention need not add any match circuit and can be issued to Perfect Matchings in two frequency of operation, cost is very cheap.
Certainly conductor is not must be for independently individual, and in actual applications, conductor can be integrally formed with radiant body or transmission line, to simplify the complexity of antenna.Be depicted as Fig. 4 A, radiant body and conductor can be integrated, form radiant body 400 and conductor 43 two parts simultaneously on sheet metal, the radiant body 400 folding back conductors 43 that finish also possess simultaneously, needn't additionally connect, shown in Fig. 4 B institute.In like manner, if adopt microstrip line as transmission line, conductor and microstrip line can utilize printing or technology such as etching to be formed at simultaneously on the circuit board at place (this moment, conductor can be considered the extension of microstrip line, but the conductor bottom does not have ground plane, and this is the different place of conductor and microstrip line).If adopting coaxial cable is transmission line, then the cable top can be divested a bit of skin makes heart yearn expose (mainly being the metallic cover of removing as ground plane), exposed heart yearn promptly is a conductor, promptly is transmission line by the outer heart yearn that coats, the structure that also is one of the forming.
No matter conductor is to be formed on transmission line or the radiant body, and radiant body all can utilize surface adhering technology (Surface-Mount Technology) to combine with transmission line, in order to the manufacturing.That is the SMT element that radiant body of the present invention can be used as standard combines with circuit board, to simplify production procedure, reduces cost.
Hereinafter, will utilize experimental data to cooperate embodiment to be illustrated, in the hope of more showing spirit of the present invention.Present mobile phone multioperation is in GSM or two frequency bands of DCS, and therefore the frequency of operation with antenna is set in 900MHz and 1800MHz, to use as antenna for mobile phone.Radiant body width after folding is about 34mm, thickness and is about 9mm, height and is about 12mm (only be about 900MHz wavelength 3.6%) from ground plane, under this kind size, radiant body can be reached the design object of conceal antenna by in the interior casing that is built in general mobile phone.Then please refer to Fig. 5, it is depicted as the measurement result of returning loss.If according to returning the definition of loss less than the antenna impedance frequency range of 10dB, can record in low frequency operation mode 301 frequency ranges and can reach 94MHz (879-973MHz), can reach 270MHz (1615-1885MHz) in high-frequency operation mode 302 frequency ranges, be enough to contain mobile communcations system GSM (890-960MHz) and two frequency bands of DCS (1710-1880MHz), the operating characteristic excellence.Fig. 6 A is the antenna gain measurement result of antenna in the GSM frequency band, Fig. 6 B is the antenna gain measurement result of antenna in the DCS frequency band, antenna gain in the GSM frequency band is between 2.0-3.0dBi, and the antenna gain in the DCS frequency band then between 3.0-4.5dBi, all has good antenna gain.
Can form sinuous banded structure at radiant body side several otch that are crisscross arranged, and define the current path of two different lengths, but make radiant body resonance as can be known by narration above in different frequency of operation by the setting of load point.In other words, the length of current path has directly influenced the height of frequency of operation, as long as therefore can be adjusted the length of current path, just equals to adjust the height of frequency of operation.Please refer to Fig. 7 A, it is depicted as the current path method of adjustment schematic diagram of radiant body.The starting point of current path L1 is that load point F, terminal point are the openends 71 at radiant body edge, and the starting point of current path L2 is that load point F, terminal point are the openends 73 at radiant body edge.Clearly, because the outwards outstanding event of openend 71 makes current path L1 prolong, the high-frequency operation frequency reduces; Otherwise because openend 73 inwardly contracts, so current path L2 shortens, the low frequency frequency of operation raises.Use such method of adjustment, frequency of operation can be adjusted very accurate, give full play to the usefulness of antenna.Situation after radiant body 700 folding the finishing is shown in Fig. 7 B.
Planar monopole antenna is used on the little radio communication product of volume usually, because unipole antenna utilizes 1/4th operative wavelengths to come the principle of resonance, resonance length compared with employed 1/2nd wavelength of dipole (dipole) antenna reduces half, so unipole antenna is widely used on the compact radio communication product.
For the physical length of more effective shortening planar monopole antenna, once used the structure of zigzag (meander) to increase antenna surface path of current length in the document in the past, and then reached the purpose that reduces the antenna operation frequency.But this method often can only make unipole antenna operate in single operation mode, and contributes little for the ratio that dwindles of antenna size.
Effectively to dwindle antenna size and antenna can be operated under two mode simultaneously in order to reach, the present invention proposes a kind of double frequency mono-polar antenna structure simple, that low production cost also can meet above-mentioned functions simultaneously of making.Only use a load point just can excite for two different surface current paths simultaneously in the antenna structure of the present invention, more will make the folding column structure that forms for the radiation sheet metal on plane originally in addition, still not influence the dual frequency operation characteristic of antenna after so the area of plane of antenna significantly being dwindled.Owing to antenna structure of the present invention extremely is fit to use in the casing of compact communication product such as mobile phone, and has the easy and characteristic with low cost of the manufacturing, so very have the industry using value.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; any insider; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking the accompanying Claim person of defining.
Claims (10)
1. folding double frequency monopolar antenna, it is built in the terminal of using it, and this antenna has one first frequency of operation and one second frequency of operation, and this folding double frequency monopolar antenna comprises:
One radiant body has a first side and a second side with respect to this first side, and this radiant body comprises:
A plurality of otch are arranged at this first side and this second side, and wherein those otch are to be crisscross arranged; And
One load point, in order to define one first current path and one second current path, the length of this first current path is about 1/4 of this first frequency of operation institute corresponding wavelength, the length of this second current path approximately this second frequency of operation institute corresponding wavelength 1/4;
Wherein, this radiant body is that bearing of trend along those otch is folded to form a column structure;
One transmission line is in order to transmission signals; And
One conductor is in order to connect this transmission line and this load point.
2. folding double frequency monopolar antenna as claimed in claim 1, wherein this conductor is integrally formed with this radiant body.
3. folding double frequency monopolar antenna as claimed in claim 1, wherein this radiant body is a rectangular metal sheet.
4. folding double frequency monopolar antenna as claimed in claim 1, wherein this first frequency of operation is about 900MHz, and this second frequency of operation is about 1800MHz.
5. folding double frequency monopolar antenna as claimed in claim 1, wherein those otch are parallel to each other.
6. folding double frequency monopolar antenna as claimed in claim 1 more comprises a column dielectric material, and this radiant body is the surface that is formed at this column dielectric material.
7. folding double frequency monopolar antenna as claimed in claim 6, wherein this column dielectric material is a ceramic material.
8. folding double frequency monopolar antenna as claimed in claim 6, wherein this radiant body is to utilize printing technology to be formed at the surface of this column dielectric material.
9. folding double frequency monopolar antenna as claimed in claim 1, wherein this column structure is a rectangle column structure.
10. folding double frequency monopolar antenna as claimed in claim 1, wherein this column structure is a circular cylindrical shape structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021277346A CN1264371C (en) | 2002-08-07 | 2002-08-07 | Folding double frequency monopolar antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021277346A CN1264371C (en) | 2002-08-07 | 2002-08-07 | Folding double frequency monopolar antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1474619A CN1474619A (en) | 2004-02-11 |
| CN1264371C true CN1264371C (en) | 2006-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021277346A Expired - Lifetime CN1264371C (en) | 2002-08-07 | 2002-08-07 | Folding double frequency monopolar antenna |
Country Status (1)
| Country | Link |
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| CN (1) | CN1264371C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2423214A (en) * | 2005-02-11 | 2006-08-16 | Frank Cunningham | Translating and scanning device |
| TWI497822B (en) * | 2011-12-09 | 2015-08-21 | Auden Techno Corp | Antenna module capable of respectively maintaining the vswr value and the antenna efficiency within a first and a second predetermined ranges when the antenna usage volume be reduced within a predetermined reduction range |
| CN107369889B (en) * | 2017-08-04 | 2021-04-13 | 苏州优尼赛信息科技有限公司 | Compact dual-band linearly polarized monopole antenna |
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2002
- 2002-08-07 CN CNB021277346A patent/CN1264371C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CN1474619A (en) | 2004-02-11 |
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Granted publication date: 20060712 |
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