CN101764281B - Dual-frequency antenna - Google Patents
Dual-frequency antenna Download PDFInfo
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- CN101764281B CN101764281B CN 200910109199 CN200910109199A CN101764281B CN 101764281 B CN101764281 B CN 101764281B CN 200910109199 CN200910109199 CN 200910109199 CN 200910109199 A CN200910109199 A CN 200910109199A CN 101764281 B CN101764281 B CN 101764281B
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Abstract
The invention discloses a dual-frequency antenna which comprises a spiral structure radiator electrically connected to a host by an electric feeding point of the host; the lower end of the radiator is set as a first radiator for generating resonance; the upper end of the radiator is set as a second radiator for generating resonance with higher frequency than the resonance frequency of the first radiator; and the pitch of the spiral structure of the second radiator is longer than the pitch of the first radiator. The invention can realize tunes on the whole frequency range of the UHF and is easy to focus the performance of dual-frequency antenna on the upper hemispherical surface in a better way when the dual-frequency antenna is at GPS frequency.
Description
Technical field
The present invention relates to a kind of antenna, more particularly, relate to a kind of dual-band antenna.
Background technology
At present, hand-held terminal device has a plurality of frequency ranges usually to realize a plurality of functions or miscellaneous function, global system for mobile communications GSM and the required frequency range of Digital Cellular System DCS (GSM+DCS) as mobile phone, the hyperfrequency of intercom (UHF) and global positioning system frequency (GPS) etc., its corresponding antenna is also double frequency or multifrequency.Prior art adopts the dual-band antenna of partial resonance structure usually, and the partial resonance structure is generally that higher frequency range is designed with different structural parameters, and whole antenna oscillator produces a kind of frequency, and high-frequency resonant is to produce with the different part spiral of parameter.As early stage antenna for mobile phone, be generally that the bottom that the DCS frequency range is placed on coil is processed.
Many dual-band antennas work in the mode of operation of UHF+GPS frequency range, and it adopts the partial resonance of helical structure to realize it mostly, high-frequency resonant partly is placed on the bottom of coil, and it and another part consist of the resonance of lower frequency jointly.Referring to Fig. 1, it is the structural representation of the dual-band antenna of available technology adopting partial resonance, it is placed on the GPS resonance portion bottom of spiral, form resonance, it is for the GPS frequency range, and the performance of antenna more concentrates on second sphere, at needed first sphere of GPS (part that points into the sky), Performance Ratio is relatively poor, and is not suitable for the GPS performance of specialty and the functional localization of professional terminal equipment.
It is tuning that the frequency that antenna works in the GPS frequency range must be that the antenna odd-multiple that works in the frequency of uhf band (such as 1 times, 3 times, 5 times, 7 times etc.) just can make whole antenna ratio easier realize, in other frequency range, more difficult.For example, be directed to the external dual-band antenna of existing intercom, it is the mode of operation of UHF+GPS frequency range, whole frequency ranges of hyperfrequency (UHF) are 300-870MHz, when the resonance of GPS is three rank resonance (being five times in dominant frequency) of uhf band, only in the situation that the UHF frequency is 1/5th left and right of 1575M, just can be relatively easy to tuning, in other frequency range, more difficult, especially near 3.5 times, 4.5 doubly, 5.5 frequency doubly almost unlikely realizes tuningly, is difficult to especially realize tuning accurately.So the dual-band antenna that works in GPS+UHF in prior art is not easy to carry out in some frequency range tuning, so just be unfavorable for that antenna sends and acknowledge(ment) signal in a plurality of frequency ranges.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned dual-band antenna of the prior art better defective that concentrates on episphere of antenna performance when component frequency is difficult to realize tuning and can not be in the GPS frequency range, provide that a kind of that dual-band antenna is easily realized at multi-frequency more is tuning, and performance can better concentrate on the dual-band antenna of first sphere when antenna works in the GPS frequency range simultaneously.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of dual-band antenna, the radiant body that comprises the helical structure that distributing point and main frame by main frame are electrically connected, the lower end of described radiant body is set to the first radiant body for generation of resonance, the upper end of described radiant body is set to the second radiant body for generation of the resonance higher than described the first radiant body resonance frequency, and the pitch of the helical structure of described the second radiant body is greater than the pitch of the helical structure of described the first radiant body.
In dual-band antenna of the present invention, the 3rd radiant body that also comprises the linearity that is connected with described the second radiant body top, the free end of the 3rd radiant body extend along the direction toward distributing point in the helical structure that is formed by the first radiant body and the second radiant body.
In dual-band antenna of the present invention, the length of described the 3rd radiant body is no more than 1/4th of wavelength corresponding to the second radiant body operating frequency.
In dual-band antenna of the present invention, the pitch of the helical structure of described the second radiant body is the twice of pitch of the helical structure of described the first radiant body.
In dual-band antenna of the present invention, the total length of described the first radiant body and described the second radiant body is the length of a resonance of antenna working frequency range.
In dual-band antenna of the present invention, the length of described the second radiant body is that antenna is in the length of a resonance of GPS working frequency range.
Implement dual-band antenna of the present invention, have following beneficial effect: it adopts the first radiant body and second radiant body of different pitches, and the pitch of the second radiant body is greater than the pitch of the first radiant body, thereby make the GPS frequency band resonance of high frequency by the second radiant body realization on coil top, the resonance of UHF is realized by the first radiant body that is positioned at coil bottom, make like this GPS resonance portion be positioned at the top of helical structure, realized that the antenna performance of antenna when the GPS frequency range better concentrates on first sphere.
And it is by adding the 3rd radiant body to form a regulon, and the 3rd radiant body and the second radiant body acting in conjunction can realize that the double frequency in whole uhf bands is tuning.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in accompanying drawing:
Fig. 1 is the structural representation of the dual-band antenna of available technology adopting partial resonance,
Fig. 2 is the structural representation of dual-band antenna one embodiment of the present invention;
Fig. 3 be when not adopting the 3rd radiant body in Fig. 2 one embodiment at the return loss schematic diagram of GPS frequency range;
Fig. 4 is that dual-band antenna one embodiment of the present invention is at the return loss schematic diagram of GPS frequency range;
Fig. 5 is that dual-band antenna one embodiment realistic model of the present invention is schemed at UHF wave band radiance darkroom test result 2D;
Fig. 6 is that the 2D at UHF wave band radiance of dual-band antenna one embodiment emulation testing of the present invention schemes.
Embodiment
The present invention is by being arranged at the GPS resonance portion on the top of aerial coil, the bottom that the UHF resonance portion is arranged on aerial coil has directivity preferably to realize antenna at first sphere, simultaneously, add a regulon to realize that with the acting in conjunction of antenna other parts the double frequency in whole uhf bands (300-800MHz) is tuning on the top of antenna.
Referring to Fig. 2, it is the structural representation of dual-band antenna one preferred embodiment of the present invention, and it comprises the radiant body that is electrically connected with the main frame distributing point.Radiant body comprises three parts, namely for generation of spiral helicine first radiant body 1 of resonance, for generation of than spiral helicine second radiant body 2 of the resonance of the first radiant body 1 resonance frequency higher frequency, and the 3rd radiant body 3, the first radiant bodies 1, the second radiant body 2 and the 3rd radiant body 3 of linearity connect successively from the bottom up.One end of the 3rd radiant body 3 is connected with the top of the second radiant body, the free end of the 3rd radiant body 3 is positioned at the helical structure that is formed by the first radiant body 1 and the second radiant body 2, and extend along the direction toward distributing point, the length of the 3rd radiant body 3 is no more than 1/4th of wavelength corresponding to the second radiant body 2 operating frequencies.
The pitch of the helical structure of the second radiant body 2 is greater than the pitch of the helical structure of described the first radiant body 1, and the length of the second radiant body is that antenna is in the length of a resonance of GPS working frequency range.thereby, the top of radiant body, namely the second radiant body 2 mainly produces resonance in the GPS frequency range, the bottom of radiant body, namely the first radiant body 1 is mainly at uhf band generation resonance, the 3rd radiant body and the first radiant body and the second radiant body are by coupling, can carry out tuning, when only having the spiral radiation body, the factor of GPS resonance is decided by the structure of the first radiant body and the second radiant body, after adding the 3rd radiant body, straight line portion and spiral part acting in conjunction, make the factor major part of GPS resonance be decided by the 3rd radiant body, so, optimization by the 3rd radiator structure, can do the adjusting of GPS, the GPS that antenna is realized at the UHF full range is regulated.Preferably, the pitch of the helical structure of the second radiant body 2 is the twice of pitch of the helical structure of the first radiant body 1.Can make like this antenna that better directivity is arranged.The total length of the first radiant body 1 and the second radiant body 2 is the length of a resonance of antenna working frequency range, in the length of the 3rd radiant body 3 fixedly the time, as long as the pitch of the second radiant body 2 can realize realizing that in whole frequency ranges (300-800MHz) of UHF double frequency is tuning greater than the pitch of the first radiant body 1.Like this, just can realize that antenna works in more frequency range.
referring to Fig. 3, Fig. 3 be when not adopting the 3rd radiant body in Fig. 2 one embodiment at the return loss schematic diagram of GPS frequency range, use A in figure, B, C, D, E shows respectively the return loss schematic diagram of antenna when different structure, shown in curve A for the spiral radiation body be 13.5 the circle, the GPS frequency of dual-band antenna work is 400MHZ, the frequency of its GPS frequency range is approximately 4.5 times of its frequency that works in uhf band, bad from the tuning effect of scheming visible antenna, shown in curve B is that the second radiant body is 15 circles, the GPS frequency of dual-band antenna work is 380MHZ, the frequency of its GPS frequency range is approximately 4.75 times of its frequency that works in uhf band, shown in curve C is that the second radiant body is 10.5 circles, the GPS frequency of dual-band antenna work is 465MHZ, the frequency of its GPS frequency range is approximately 3 times of its frequency that works in uhf band, shown in curve D is that the second radiant body is 12 circles, the GPS frequency of dual-band antenna work is 420MHZ, the frequency of its GPS frequency range is approximately 4 times of its frequency that works in uhf band, shown in curve E is that the second radiant body is 15.5 circles, the GPS frequency of dual-band antenna work is 388MHZ, the frequency of its GPS frequency range is approximately 4.8 times of its frequency that works in uhf band, antenna return loss is close to 0dBi from figure visible curve E, be the signal that arrives of antenna reception seldom, its tuning effect is relatively poor, and in curve C, the frequency of the GPS frequency range of antenna work is close to the odd-multiple of the frequency of uhf band, so, its tuning effect is fine.
Referring to Fig. 4, it is the return loss schematic diagram of dual-band antenna one embodiment of the present invention in the GPS frequency range; Wherein, UHF resonance is the 400MHZ left and right, and the frequency of the GPS frequency range of antenna work is its how many 3.8 times of left and right that work in the frequency of uhf band, and antenna has good tuning effect, and owing to having added the 3rd radiant body, it can better realize tuning.
Referring to Fig. 5 to Fig. 6, Fig. 5 is dual-band antenna one embodiment realistic model of the present invention at the 2D figure of UHF wave band radiance darkroom test result; Fig. 6 is that the 2D at UHF wave band radiance of dual-band antenna one embodiment emulation testing of the present invention schemes; In Fig. 5, solid line is the antenna pattern of antenna when working in 1575MHZ, dotted line is the antenna pattern of antenna when working in 430MHZ, in Fig. 6, dotted line is the antenna pattern of antenna when working in 1575MHZ, and solid line is the antenna pattern of antenna when working in 430MHZ.As seen the result in the darkroom test shows that the whole frequency range efficient of antenna also meets people's requirement, and the gain of uhf band is the 0dBi left and right, and the gain of GPS is about the 0dBi left and right.Antenna did not have dark depression at poincare half plane, had to approach symmetrical directional diagram parameter.
In a word, the present invention is with the tuning influencing factor of GPS frequency range, transferred to the radiant body of straight line portion by the radiant body of spiral part, the 3rd radiant body that connects at the top of antenna is partly done the adjusting of GPS, pass through structural optimization, the GPS that realizes the UHF full frequency band regulates, and affects hardly the performance of GPS.It can realize having homogeneity of product and lower fraction defective preferably aspect production.This dual-band antenna can be widely used in multiple hand-held terminal device, can receive more signal at more orientation angle.
The above is only the preferred embodiments of the present invention, not in order to limiting the present invention, all any modifications of doing in the spirit and principles in the present invention, is equal to and replaces or improvement etc., all should be included in protection scope of the present invention.
Claims (4)
1. dual-band antenna, the radiant body that comprises the helical structure that distributing point and main frame by main frame are electrically connected, it is characterized in that, the lower end of described radiant body is set to the first radiant body for generation of resonance, the upper end of described radiant body is set to the second radiant body for generation of the resonance higher than described the first radiant body resonance frequency, the pitch of the helical structure of described the second radiant body is greater than the pitch of the helical structure of described the first radiant body, and the length of described the second radiant body is that antenna is in the length of a resonance of GPS working frequency range; The lower end of described radiant body is the end near described distributing point;
Be provided with on described the second radiant body top the 3rd radiant body that is connected with described the second radiant body, described the 3rd radiant body is linearity, and the free end of described the 3rd radiant body extends along the direction toward distributing point in the helical structure that is formed by described the first radiant body and described the second radiant body.
2. dual-band antenna according to claim 1, is characterized in that, the length of described the 3rd radiant body is no more than 1/4th of wavelength corresponding to the second radiant body operating frequency.
3. dual-band antenna described according to any one in the claims, is characterized in that, the pitch of the helical structure of described the second radiant body is the twice of pitch of the helical structure of described the first radiant body.
4. dual-band antenna described according to the claims 3, is characterized in that, the total length of described the first radiant body and described the second radiant body is the length of a resonance of antenna working frequency range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910109199 CN101764281B (en) | 2009-07-31 | 2009-07-31 | Dual-frequency antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910109199 CN101764281B (en) | 2009-07-31 | 2009-07-31 | Dual-frequency antenna |
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| Publication Number | Publication Date |
|---|---|
| CN101764281A CN101764281A (en) | 2010-06-30 |
| CN101764281B true CN101764281B (en) | 2013-05-08 |
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| CN 200910109199 Active CN101764281B (en) | 2009-07-31 | 2009-07-31 | Dual-frequency antenna |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916916B (en) * | 2010-07-14 | 2013-11-27 | 海能达通信股份有限公司 | Dual-band antenna |
| US9112285B2 (en) | 2010-07-14 | 2015-08-18 | Hytera Communications Corp., Ltd. | Dual frequency antenna |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1278959A (en) * | 1997-09-15 | 2001-01-03 | 艾利森公司 | Dual-band helix antenna with parasitic element |
| CN101431178A (en) * | 2007-11-08 | 2009-05-13 | 神基科技股份有限公司 | Dual-frequency helical antenna with wide band |
-
2009
- 2009-07-31 CN CN 200910109199 patent/CN101764281B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1278959A (en) * | 1997-09-15 | 2001-01-03 | 艾利森公司 | Dual-band helix antenna with parasitic element |
| CN101431178A (en) * | 2007-11-08 | 2009-05-13 | 神基科技股份有限公司 | Dual-frequency helical antenna with wide band |
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