CN1474478A - Double frequency mono-polar antenna - Google Patents
Double frequency mono-polar antenna Download PDFInfo
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- CN1474478A CN1474478A CNA021277354A CN02127735A CN1474478A CN 1474478 A CN1474478 A CN 1474478A CN A021277354 A CNA021277354 A CN A021277354A CN 02127735 A CN02127735 A CN 02127735A CN 1474478 A CN1474478 A CN 1474478A
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Abstract
A two-frequency one pole antenna includes a microwave base plate, radiation elements and transmission line among which, the radiation elements are composed of a central radiator and several radiation arms, the central radiator generates a resonant modal, the arms generate another resonant modal, thus the said antenna can operate on two different frequencies In actual practice, every radiation arm can be set symmetrically and leaking two corresponding sidewalls of the radiator and electromagnetic coupling efficiency between the arms and the radiator makes the impedance good matching.
Description
Technical field
The invention relates to a kind of dual-band antenna, and particularly relevant for a kind of double frequency mono-polar antenna.
Background technology
Flourish along with communications industry in recent years, various wireless product also occurs like the mushrooms after rain.With current very popular Wireless LAN (Wireless local area network) is example, and its Related product just has quite high market value, and widely industry is attracted attention.In wireless system, Antenna Design is suitable the key link, is applicable to the communication product of Wireless LAN at present, unipole antenna (monopole antenna) designs of adopting long straight shape conductor more; Because complex structure and the volume of these Antenna Design when dual frequency operation is bigger, so practical value is limited.Moreover these Antenna Design need add match circuit usually just can reach matched well, makes cost of manufacture higher.
On the other hand, because the wireless signal (as 5.2GHz) of higher-frequency is subjected to such environmental effects such as terrain and its features when propagating and decay rapidly easily, so the transmission range of high-frequency signal and signal quality will be greatly affected.So in the application of wireless telecommunication system, except considering whether antenna can provide the convenience of dual frequency operation, should notice more whether antenna gain can be promoted when high frequency, make whole communication system still can provide the good signal quality when high-frequency operation, this is to demand the direction of making great efforts at present urgently.
Summary of the invention
In view of this, purpose of the present invention is providing a kind of double frequency mono-polar antenna exactly, to reduce cost of manufacture.
Another object of the present invention is providing a kind of double frequency mono-polar antenna exactly, makes it have the characteristics of dual frequency operation and high antenna gain.
According to purpose of the present invention, a kind of double frequency mono-polar antenna is proposed, being summarized as follows of this device:
Double frequency mono-polar antenna can adopt microwave base plate to be made, and utilizes technology such as printing or etching radiant element to be formed in the surface of microwave base plate.Radiant element can be combined by central radiator and several radiation arms, and central radiator is in order to produce a resonance mode, and radiation arm makes double frequency mono-polar antenna can operate in two different frequencies then in order to produce another resonance mode.In practical application, each radiation arm can be symmetrical arranged and press from both sides and be against the corresponding dual-side of central radiator, and make the impedance matching of resonance mode good by the electromagnetic coupling effect between radiation arm and the central radiator.In addition, the radiation pattern that most radiation arms can be strengthened antenna is set, reaches the purpose that improves antenna gain.
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
A kind of double frequency mono-polar antenna schematic diagram that provides according to a preferred embodiment of the present invention is provided.
Figure 2 shows that the composition schematic diagram of radiant element among Fig. 1.
What Figure 3 shows that double frequency mono-polar antenna among Fig. 1 returns loss (return loss) measurement result.
Figure 4 shows that double frequency mono-polar antenna among Fig. 1 operates in the antenna gain measurement result of 2.4GHz frequency band.
Figure 5 shows that double frequency mono-polar antenna among Fig. 1 operates in the antenna gain measurement result of 5.2GHz frequency band.
Figure 6 shows that a kind of distortion of the radiant element of Fig. 1.
Figure 7 shows that the another kind distortion of the radiant element of Fig. 1.Label declaration
10: microwave base plate
11: double frequency mono-polar antenna
21,22,23: resonance mode
110: central radiator
133,135: radiation arm
150: microstrip line
610: central radiator
710: central radiator
713,715: radiation arm
Gnd: ground plane
Embodiment
Please refer to Fig. 1, a kind of double frequency mono-polar antenna schematic diagram that provides according to one embodiment of the present invention is provided for it.Double frequency mono-polar antenna 11 can utilize microwave base plate 10 to be made, and wherein radiant element 100 can be formed at the surface of microwave base plate 10 by technology such as etching or printings, in order to produce two different resonance modes, makes antenna can operate in two different frequencies.At the side signal transmission face, if adopt microstrip line (microstrip line) during design as transmission line (transmission line), then can the microstrip line 150 that link to each other with radiant element 100 be set, and be provided with and microstrip line 150 corresponding ground plane Gnd at the back side of microwave base plate 10 in the front of microwave base plate 10.Certainly also can utilize the transmission line of other types to be connected to radiant element 100 with the transmit antenna signal, for example co-plane waveguide (coplanarwaveguide, CPW) or coaxial cable (coaxial cable) etc., for the insider can know by inference.
Then please refer to Fig. 2, it is depicted as the composition of radiant element 100.Radiant element 100 can comprise central radiator 110 and radiation arm 133,135, and central radiator 110 is in order to producing the resonance mode of first frequency of operation, and radiation arm 133,135 is in order to produce the resonance mode of second frequency of operation.During design, can allow the length of central radiator 110, make central radiator 110 resonance in lower frequency greater than the length of radiation arm 133,135.With the example that is applied as of Wireless LAN, because antenna must have 2.4GHz and two frequency of operation of 5.2GHz, thus can make the length of central radiator 110 be about 1/4 wavelength of 2.4GHz, and the length of radiation arm 133,135 respectively is about 1/4 wavelength of 5.2GHz.It should be noted that radiation arm 133 and radiation arm 135 are to be symmetrical arranged, and have the bending of a special angle, two radiation arms can be pressed from both sides be against central radiator 110 corresponding dual-sides, to produce electromagnetic coupling effect.With Fig. 2 is example, and central radiator 110 is a rectangular configuration, so radiation arm 133 needs about 90 bendings of spending with radiation arm 135, makes radiation arm 133 and radiation arm 135 press from both sides left side and the right side that is against central radiator 110 respectively.Because of radiation arm 133,135 with the distance of central radiator 110 quite near (but not directly contacting), so when radiant element 100 is excited, radiation arm 133,135 and central radiator 110 between just can form electromagnetic coupling effect, make impedance matching perfect more of resonance mode.
Making impedance matching by electromagnetic coupling effect well is crucial condition.Because central radiator 110 and radiation arm 133,135th, therefore shared identical signal feed-in point must make central radiator 110 and radiation arm 133,135 reach good impedance matching simultaneously when design, and antenna just has the characteristics of dual frequency operation; For central radiator 110 and radiation arm 133,135 are all mated well, electromagnetic coupled is one of necessary condition.In other words, if the distance of radiation arm 133,135 and central radiator 110 can't be coupled to energy greatly, it is good just can not to make central radiator 110 and radiation arm 133,135 reach impedance matching simultaneously.Find that in experiment if electromagnetic coupling effect do not exist, then the impedance matching property variation of radiation arm 133,135 during central radiator 110 impedance matchings diminishes the operation frequency range of the resonance mode of winning.Or the impedance matching property of central radiator 110 is relatively poor during radiation arm 133,135 impedance matchings, makes the operation frequency range of second resonance mode reduce.Thus, antenna just can't operate in two resonance modes that impedance matching is good simultaneously.
On the other hand, have the operating characteristic of high-gain (gain) for making antenna, it is necessary that most (two or more) radiation arms are set.Radiation arm 133 can be symmetrical arranged with radiation arm 135 and in the same direction (is that example is the y direction with Fig. 2) extend, make radiation pattern in azimuthal plane all near omni-directional (omnidirectional).Because the present invention need not add extra match circuit and can obtain good impedance matching, therefore can produce dual-band antenna with cheap cost of manufacture.
Take a broad view of the above, have the characteristics of dual frequency operation and high-gain for making antenna, must possess two conditions simultaneously: one must be provided with most radiation arms, to strengthen radiation field intensity; Its two, these radiation arms must and central radiator between have electromagnetic coupling effect.
Fig. 3 returns loss (return loss) measurement result for double frequency mono-polar antenna 11.The relative dielectric coefficient of microwave base plate 10 is about 4.4, and thickness is about 0.4mm, and length is about 57mm.The length of central radiator 110 is about 25mm, can produce resonance mode 21 and resonance mode 23 when being excited, and resonance mode 21 pairing frequency of operation are about 2.4GHz, and resonance mode 23 is two frequency multiplication mode of resonance mode 21.On the other hand, radiation arm 133 is about 13mm with the length of radiation arm 135, can produce resonance mode 22 when being excited, and pairing frequency of operation is about 5.2GHz.Aspect frequency range, with voltage standing wave ratio (voltage standing wave ratio, VSWR) equal 1.5 or 14dB return the definition of loss impedance frequency range, frequency range is 112MHz when operating in 2.4GHz, the frequency range that operates in 5.2GHz is 310MHz, satisfies the Wireless LAN system respectively in 2.4GHz (2.4～2.484GHz) and 5.2GHz (5.15～5.35GHz) operation frequency range requirement.
Fig. 4 is the antenna gain measurement result that double frequency mono-polar antenna 11 operates in the 2.4GHz frequency band, demonstrates antenna gain and reaches as high as 2.1dBi.Fig. 5 is the antenna gain measurement result that double frequency mono-polar antenna 11 operates in the 5.2GHz frequency band, demonstrates antenna gain and reaches as high as 5.7dBi.By Fig. 4 and Fig. 5 as can be seen, double frequency mono-polar antenna proposed by the invention has more the characteristic of high-gain during high-frequency operation except that the characteristics that possess dual frequency operation.
Certainly, as long as the relativeness of central radiator and radiation arm satisfies condition referred to above, the outward appearance of central radiator and radiation arm has a little distortion to be allowed to.For example the width of the central radiator 610 of Fig. 6 is linear (1inear) and increases progressively, and the width of the central radiator 710 of Fig. 7 is stepped (step) and increases progressively, and the width of radiation arm 713,715 is linear increment, does not all influence exploitativeness of the present invention.Or be that the width of radiation arm 713,715 also is stepped and increases progressively, or in the edge of central radiator and radiation arm or inside fluting (slot) or otch (slit) are set with shorten product sizes, all be feasible scheme, still do not break away from spirit of the present invention.
The double frequency mono-polar antenna that the above embodiment of the present invention is disclosed, under the dual-band operation of reaching 2.4GHz and 5.2GHz, it line width only is about 12mm, and is approaching with the unipole antenna of the straight shape conductor of general length, is fit to very much provide the dual-band operation of relevant Wireless LAN system.In addition, the radiation pattern of antenna of the present invention on azimuthal plane is in close proximity to isotropic directivity, and good antenna gain performance is arranged all in two operational frequency bands of antenna, the antenna gain of low frequency and high frequency is about 2.1dBi and 5.7dBi respectively, is fit to very much be applied on the base station (base station oraccess point) of Wireless LAN system now.
Unipole 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.
In traditional in the past technology, unipole antenna is that the metallic conductor that the dielectric material with insulation coats long straight shape is formed, thus mostly be long straight column in appearance, except volume greatly, manufacturing cost is costliness comparatively also.Among the present invention except proposing the very cheap planar monopole antenna of a kind of cost of manufacture, and dual-band operation is provided and keeps antenna length under the constant situation of quarter-wave, make antenna can have the design of high gain characteristics, improve traditional column dipole antenna design in the impracticable characteristic of dual-band operation and need to use the mode that increases antenna length to promote many shortcomings of antenna gain etc.
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 (13)
1. double frequency mono-polar antenna comprises:
One microwave base plate;
One radiant element, be formed at the surface of this microwave base plate, in order to produce one first resonance mode and one second resonance mode, make this double frequency mono-polar antenna have first frequency of operation and second frequency of operation corresponding to this second resonance mode corresponding to this first resonance mode, this radiant element comprises:
One central radiator is in order to produce this first resonance mode; And
A plurality of radiation arms, in order to produce this second resonance mode, those radiation arms are to be symmetrical arranged and to press from both sides to be against the corresponding dual-side of this central radiator, produce electromagnetic coupled (electromagnetic coupling) effect between those radiation arms and this central radiator to make, wherein those radiation arms are to extend in the same direction; And
One transmission line is coupled to this central radiator and those radiation arms with the transmit antenna signal.
2. double frequency mono-polar antenna as claimed in claim 1, wherein this first frequency of operation is lower than this second frequency of operation.
3. double frequency mono-polar antenna as claimed in claim 2, wherein this first frequency of operation is about 2.4GHz, and this second frequency of operation is about 5.2GHz.
4. double frequency mono-polar antenna as claimed in claim 1, wherein the length of this central radiator is about 1/4th of this first frequency of operation institute corresponding wavelength.
5. double frequency mono-polar antenna as claimed in claim 1, wherein the length of those radiation arms is about 1/4th of this second frequency of operation institute corresponding wavelength.
6. double frequency mono-polar antenna as claimed in claim 1, wherein this transmission line is microstrip line (microstrip line).
7. double frequency mono-polar antenna as claimed in claim 1, wherein this transmission line is coaxial cable (coaxial cable).
8. double frequency mono-polar antenna as claimed in claim 1, wherein this transmission line is co-plane waveguide (coplanar waveguide).
9. double frequency mono-polar antenna as claimed in claim 1, wherein this central radiator is a rectangle.
10. double frequency mono-polar antenna as claimed in claim 1, wherein the width of this central radiator is stepped (step) and increases progressively.
11. double frequency mono-polar antenna as claimed in claim 1, wherein the width of this central radiator is linear (linear) and increases progressively.
12. double frequency mono-polar antenna as claimed in claim 1, wherein the width of those radiation arms is fixed.
13. double frequency mono-polar antenna as claimed in claim 1, wherein the width of those radiation arms is linear increment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021277354A CN1264250C (en) | 2002-08-07 | 2002-08-07 | Double frequency mono-polar antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021277354A CN1264250C (en) | 2002-08-07 | 2002-08-07 | Double frequency mono-polar antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1474478A true CN1474478A (en) | 2004-02-11 |
| CN1264250C CN1264250C (en) | 2006-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021277354A Expired - Lifetime CN1264250C (en) | 2002-08-07 | 2002-08-07 | Double frequency mono-polar antenna |
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| CN (1) | CN1264250C (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7405699B2 (en) | 2006-10-20 | 2008-07-29 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Multiple input multiple output antenna |
| CN101740865A (en) * | 2010-02-03 | 2010-06-16 | 华为终端有限公司 | Monopole antenna-based method for acquiring double frequency points and device |
| CN101165970B (en) * | 2006-10-20 | 2011-08-24 | 鸿富锦精密工业（深圳）有限公司 | Antenna and its combination |
| US8395549B2 (en) | 2008-01-22 | 2013-03-12 | Asustek Computer Inc. | Triple band antenna |
| CN103594785A (en) * | 2012-12-28 | 2014-02-19 | 中国科学院电子学研究所 | Vehicle ultra wide band resistive loading single pole antenna |
| CN105144477A (en) * | 2013-03-13 | 2015-12-09 | 微软技术许可有限责任公司 | Dual band wlan coupled radiator antenna |
| CN106486787A (en) * | 2015-09-02 | 2017-03-08 | 天线直通股份有限公司 | HDTV antenna module |
| CN106785402A (en) * | 2017-01-09 | 2017-05-31 | 江苏联海通信股份有限公司 | Ultra-thin switch type embellished antenna |
| CN106848563A (en) * | 2017-03-21 | 2017-06-13 | 奥维通信股份有限公司 | A kind of PCB dual band communications antenna |
| US10693239B2 (en) | 2015-09-02 | 2020-06-23 | Antennas Direct, Inc. | HDTV antenna assemblies |
| USD919307S1 (en) | 2015-10-08 | 2021-05-18 | Antennas Direct, Inc. | Picture frame antenna |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI713253B (en) * | 2019-11-22 | 2020-12-11 | 啓碁科技股份有限公司 | Antenna structure |
-
2002
- 2002-08-07 CN CNB021277354A patent/CN1264250C/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7405699B2 (en) | 2006-10-20 | 2008-07-29 | Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. | Multiple input multiple output antenna |
| CN101165970B (en) * | 2006-10-20 | 2011-08-24 | 鸿富锦精密工业（深圳）有限公司 | Antenna and its combination |
| US8395549B2 (en) | 2008-01-22 | 2013-03-12 | Asustek Computer Inc. | Triple band antenna |
| CN101740865A (en) * | 2010-02-03 | 2010-06-16 | 华为终端有限公司 | Monopole antenna-based method for acquiring double frequency points and device |
| CN103594785A (en) * | 2012-12-28 | 2014-02-19 | 中国科学院电子学研究所 | Vehicle ultra wide band resistive loading single pole antenna |
| CN105144477A (en) * | 2013-03-13 | 2015-12-09 | 微软技术许可有限责任公司 | Dual band wlan coupled radiator antenna |
| CN106486787A (en) * | 2015-09-02 | 2017-03-08 | 天线直通股份有限公司 | HDTV antenna module |
| CN106486787B (en) * | 2015-09-02 | 2020-05-08 | 天线直通股份有限公司 | HDTV antenna assembly |
| US10693239B2 (en) | 2015-09-02 | 2020-06-23 | Antennas Direct, Inc. | HDTV antenna assemblies |
| USD919307S1 (en) | 2015-10-08 | 2021-05-18 | Antennas Direct, Inc. | Picture frame antenna |
| USD951658S1 (en) | 2015-10-08 | 2022-05-17 | Antennas Direct, Inc. | Picture frame antenna |
| CN106785402A (en) * | 2017-01-09 | 2017-05-31 | 江苏联海通信股份有限公司 | Ultra-thin switch type embellished antenna |
| CN106848563A (en) * | 2017-03-21 | 2017-06-13 | 奥维通信股份有限公司 | A kind of PCB dual band communications antenna |
| CN106848563B (en) * | 2017-03-21 | 2023-10-03 | 奥维通信股份有限公司 | PCB double-frequency communication antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1264250C (en) | 2006-07-12 |
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Granted publication date: 20060712 |