CN102044756B - Double-frequency printing type yagi antenna - Google Patents
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- CN102044756B CN102044756B CN200910207353.8A CN200910207353A CN102044756B CN 102044756 B CN102044756 B CN 102044756B CN 200910207353 A CN200910207353 A CN 200910207353A CN 102044756 B CN102044756 B CN 102044756B
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Abstract
The invention discloses a double-frequency printing type yagi antenna which comprises a substrate, a first driver, a first director, a second driver and a reverberator. The first driver is formed on the substrate, and is used for generating a radiation field type of a first waveband. The first director is formed at one side of the first driver on the substrate, and is used for guiding the radiation field type of the first waveband to the first direction. The second driver is formed between the first driver and the first director on the substrate, and is used for generating the radiation field type of the second waveband. The reverberator is formed at one side of the first driver on the substrate, and is used for reverberating the first waveband and the second waveband at the radiation field type to the first direction.
Description
Technical field
The present invention is about a kind of double-frequency printing type yagi antenna, particularly a kind of double-frequency printing type yagi antenna of tool high directivity radiation pattern.
Background technology
In modernization information-intensive society, various wireless communication network have become one of most important approach of society switched voice or Word message, data, data, audio/video file.These wireless communication network that carry information with radio magnetic wave of access need to be utilized antenna, and therefore, the research and development of antenna become one of emphasis of modern information industry manufacturer.In order to realize the radio communication device that more small size, person easy to use carry, for example mobile phone, personal digital assistant (PDA), Wireless USB transmitter (Wireless USB Dongle), the volume of antenna also should be wanted to reduce as far as possible, so that aerial integration is entered in portable communicator.
Due to printing type aerial have lightweight, volume is little, and can be compatible with various circuit height etc. advantage, therefore, be widely used in recent years on various wireless communications products.In general,, in order to reduce the dead angle that receives or transmit, the printing type aerial in wireless communications products is realized mainly with omni-directional antenna greatly, for example printed dipole antenna (Dipole antenna).On horizontal plane, the signal of omni-directional antenna is with 360 deg radiation, and the variation of the interior signal of short distance is little, is therefore applicable to actual application.But along with the importing of aerial array or intelligent antenna technology, single antenna often needs to have the aerial radiation field pattern of high-gain and high directivity.In this case, conventional art proposes a kind of printing-type Yagi antenna (printed Yagi Antenna), it utilizes the characteristic of Yagi antenna high directivity, improves in the antenna gain using in frequency range, makes communication quality further reach the effect of improvement.
Please refer to Fig. 1, Fig. 1 is the schematic diagram of a traditional Yagi antenna 10.Yagi antenna 10 has basic framework of Yagi antenna, and it is made up of three elements such as a driver (Driver) 11, a reflector (Reflector) 12 and directors (Director) 13.Driver 11 is realized with a dipole antenna conventionally, is used for producing resonance according to the changing currents with time of feed-in, to produce radiated electric field.Reflector 12 is to be formed by sheet metal or metallic plate with 13 of directors, and it can inspire respectively by electromagnetic coupled the radiated electric field of and homophase anti-phase with driver 11.Thus, the radiation pattern that reflector 12 and director 13 can produce dipole antenna is toward specific direction reflection or guiding, and the gain that improves antenna.Certainly, the parasitic antenna quantity such as reflector and director can be adjusted according to the demand of actual antenna gain, and it is known known to the knowledgeable conventionally for this area tool, does not add to repeat at this.
But traditional printing formula Yagi antenna is a single-band antenna, it cannot meet the demand of current wireless communications products multiband, therefore has improved necessity.
Summary of the invention
Therefore, main purpose of the present invention is to provide a kind of double-frequency printing type yagi antenna.
The present invention discloses a kind of double-frequency printing type yagi antenna, and it includes a substrate, one first driver, one first director, one second driver, a reflector and a transmission line.This first driver is formed on this substrate, is used for producing the radiation pattern of one first frequency band.One first director is formed on this first driver on this substrate and, along a side of a first direction, is used for the radiation pattern of this first frequency band toward this first direction guiding.This second driver is formed on this substrate between this first driver and this first director, is used for producing the radiation pattern of one second frequency band.Wherein, a spacing of this second driver and this first director makes this first director form an open circuit element of this second frequency band.This reflector is formed on the reverse opposite side of this first driver and this first direction on this substrate, is used for the radiation pattern of the radiation pattern of this first frequency band and this second frequency band toward this first direction reflection.This transmission line is formed on this substrate along this first direction, is sequentially couple to this reflector, this first driver and this second driver.
Brief description of the drawings
Fig. 1 is the schematic diagram of a traditional Yagi antenna.
Fig. 2 is the embodiment schematic diagram of the present invention's one double-frequency printing type yagi antenna.
Fig. 3 is the stereogram of the double-frequency printing type yagi antenna in Fig. 2.
Fig. 4 is the upper strata metal layout of the double-frequency printing type yagi antenna in Fig. 2.
Fig. 5 is the lower metal layout of the double-frequency printing type yagi antenna in Fig. 2.
Fig. 6 is for the low frequency director in Fig. 2 is by the CURRENT DISTRIBUTION schematic diagram that changing currents with time excited of low frequency driving device.
Fig. 7 is for the reflector in Fig. 2 is by the CURRENT DISTRIBUTION schematic diagram that changing currents with time excited of low frequency driving device.
Fig. 8 is for the reflector in Fig. 2 is by the CURRENT DISTRIBUTION schematic diagram that changing currents with time excited of high frequency driver.
Fig. 9 is the stickogram of the double-frequency printing type yagi antenna in Fig. 2.
Figure 10 A is the low-band antenna gain diagram of the double-frequency printing type yagi antenna in Fig. 2 to Figure 10 C.
Figure 11 A is the high-band antenna gain diagram of the double-frequency printing type yagi antenna in Fig. 2 to Figure 11 C.
Main element symbol description
10 Yagi antennas
11 drivers
12 reflectors
13 directors
20 double-frequency printing type yagi antennas
21 substrates
22 low frequency driving devices
23 low frequency directors
24 high frequency drivers
25 reflectors
26 transmission lines.
27 high-frequency adaptations
FED signal feed side
Embodiment
Please refer to Fig. 2, Fig. 2 is the embodiment schematic diagram of the present invention's one double-frequency printing type yagi antenna 20.Double-frequency printing type yagi antenna 20 includes a substrate 21, a low frequency driving device 22, a low frequency director 23, a high frequency driver 24, a reflector 25 and a transmission line 26.Low frequency driving device 22 is formed on substrate 21, is used for producing the radiation pattern of a low-frequency band.Low frequency director 23 is formed on a side of low frequency driving device 22 on substrate 21, is used for guiding the radiation pattern of low-frequency band past+Y direction radiation.High frequency driver 24 is formed on substrate 21 between low frequency driving device 22 and low frequency director 23, is used for producing the radiation pattern of a high frequency band.The high-frequency signal producing for high frequency driver 24, high frequency driver 24 will make low frequency director 23 just as an open circuit element with a spacing of low frequency director 23.Reflector 25 is formed on the opposite side of low frequency driving device 22 on substrate 21, is used for past the radiation pattern of the radiation pattern of low-frequency band and high frequency band+Y direction reflection.Transmission line 26 is formed on substrate 21 along Y direction, is sequentially couple to reflector 25, low frequency driving device 22 and high frequency driver 24, is used for FD feed to transfer to low frequency driving device 22 and high frequency driver 24.In addition, double-frequency printing type yagi antenna 20 also comprises a high-frequency adaptation 27, is formed near of high frequency driver 24 on substrate 21, is used as a reactive load of high frequency driver, to increase the frequency range of high-frequency band signals.
In embodiments of the present invention, substrate 21 can utilize a FR4 double glazing fiber board to realize, and it has upper and lower two metal layers.Low frequency driving device 22 and high frequency driver 24 are realized by a dipole antenna of paralleled by X axis direction respectively.Each dipole antenna includes two radiation arms, is respectively formed at upper strata and the lower floor of substrate 21.Reflector 25 is realized with a sheet metal, is formed on the lower floor of substrate 21, and is couple to the ground end of double-frequency printing type yagi antenna antenna 20, and low frequency director 23 and high-frequency adaptation 27 are formed on the upper strata of substrate 21.Transmission line is realized with a microstrip line, and one end that itself and reflector 25 couple forms a signal feed side FED of antenna.About the detailed structure of double-frequency printing type yagi antenna 20, please refer to Fig. 3 to Fig. 5.Fig. 3 is the stereogram of double-frequency printing type yagi antenna 20, and Fig. 4 is the upper strata metal layout of double-frequency printing type yagi antenna 20, and Fig. 5 is the lower metal layout of double-frequency printing type yagi antenna 20.
About the each several part detailed functions of printing-type Yagi antenna, please continue to refer to following explanation.In embodiments of the present invention, low frequency driving device 22 and high frequency driver 24 are realized by the dipole antenna that is parallel to X-direction respectively, are used for producing the aerial radiation field pattern of high frequency band and low-frequency band.In the time not considering reflector 25 with low frequency director 23, the aerial radiation field pattern that dipole antenna produces is omni-directional.In general, the radiation arm length of dipole antenna is about 1/4th of the corresponding wavelength of antenna radiation frequencies, and low frequency driving device 22 is approximately the low-frequency band wavelength of 0.1～0.25 times with the distance of reflector 25.
Please note, in embodiments of the present invention, high frequency driver 24 does not produce the function of director to low frequency driving device 22, be mainly because high frequency driver 24 is too near with the distance of low frequency driving device 22, and director generally to just have more significant function apart from the wavelength of 0.1～0.25 times of driver.
Finally, high-frequency adaptation 27 is used to provide a capacitive impedance, the inductive load producing with matched transmission line 26, and increase the reflection coefficient frequency range of high frequency and little on the frequency range impact of low frequency.The high-frequency signal producing for high frequency driver 24, high-frequency adaptation 27 does not also have the effect of director, be mainly because its with high frequency driver apart from too near relation.Director generally will just have more significant function apart from the wavelength of 0.1～0.25 times of driver.Therefore, in embodiments of the present invention, high-frequency adaptation 27 is an impedance matching box that promotes high frequency band frequency range.
Briefly, the embodiment of the present invention utilizes the ground end while of antenna as the reflecting plate of low frequency driving device 22 and high frequency driver 24, and design the putting position of low frequency director 23 and high frequency driver 24, make low frequency director 23 that low frequency radiation field pattern is had the effect of push-and-pull forward but high frequency radiation field pattern is not impacted.Thus, the embodiment of the present invention does not need extra mechanism or device to change the radiation pattern of antenna, can realize at same plane the double-frequency Yagi aerial of high directivity.
Certainly, above-mentioned double-frequency printing type yagi antenna framework may be used on arbitrarily under dual-frequency system, for example, being applied to the double-frequency wireless local-area network system of an IEEE802.11.In embodiments of the present invention, double-frequency printing type yagi antenna 20 is, in single-ended feed-in (Single feed) mode, signal is fed into signal feed side FED, and in other embodiments, also differential feed-in (differential feed) mode of similar traditional Yagi antenna can be adopted, but one balance-nonbalance converter (Balun) need to be structurally increased.Above-mentioned associated change knows that by this area tool the knowledgeable is known conventionally, does not add to repeat at this.
According to one embodiment of present invention, the overall dimensions size of double-frequency printing type yagi antenna 20 is about 50mm × 50mm × 1.6mm, and low frequency driving device and high frequency driver can be used for respectively producing the frequency of operation corresponding to IEEE802.11b/g and IEEE802.11a.In this case, the analog result of double-frequency printing type yagi antenna 20 respectively as shown in Figures 9 to 11.Fig. 9 is the stickogram of double-frequency printing type yagi antenna 20, and Figure 10 A is the low-band antenna gain diagram of double-frequency printing type yagi antenna 20 to Figure 10 C, and Figure 11 A is the high-band antenna gain diagram of double-frequency printing type yagi antenna 20 to Figure 11 C.As shown in Figure 9, if taking-10dB is as benchmark, and the low frequency bandwidth of double-frequency printing type yagi antenna 20 approximately drops between 2.39GHZ～2.51GHz, and high frequency frequency range drops between 4.79GHz～6.46GHz.Hence one can see that, and high-frequency adaptation 27 can effectively increase the high frequency band frequency range of double-frequency printing type yagi antenna 20.
As shown in Figures 10 and 11, no matter be high frequency or low frequency, aerial radiation field pattern all has excellent directive property.But, due to double-frequency printing type yagi antenna 20 low frequency part than HFS many a director, therefore the antenna gain of low frequency part has better performance than the antenna gain of HFS.In addition, although low frequency director 23 than the length of high frequency driver 24, as long as choosing is to suitable position, the high-frequency signal that low frequency director 23 produces high frequency driver 24 just as open circuit.
In sum, the invention provides a kind of double-frequency printing type yagi antenna, it does not need extra mechanism or device to change the radiation pattern of antenna, and can all have at High-frequency and low-frequency the radiation field of aerial field pattern of high directivity.
The foregoing is only the preferred embodiments of the present invention, all equalizations of doing according to the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. a double-frequency printing type yagi antenna, comprising:
One substrate;
One first driver, is formed on this substrate, is used for producing the radiation pattern of one first frequency band;
One first director, is formed on this first driver on this substrate and, along a side of a first direction, is used for the radiation pattern of this first frequency band toward this first direction guiding;
One second driver, be formed on this substrate between this first driver and this first director, be used for producing the radiation pattern of one second frequency band, wherein, a spacing of this second driver and this first director makes this first director form an open circuit element of this second frequency band;
One reflector, is formed on the reverse opposite side of this first driver and this first direction on this substrate, is used for the radiation pattern of the radiation pattern of this first frequency band and this second frequency band toward this first direction reflection; And
One transmission line, is formed on this substrate along this first direction, is sequentially couple to this reflector, this first driver and this second driver.
2. double-frequency printing type yagi antenna according to claim 1, it separately includes an adaptation, is formed on this substrate near this second driver, is used as a reactive load and increases the frequency range of this second frequency band.
3. double-frequency printing type yagi antenna according to claim 2, wherein this substrate has a first metal layer and one second metal level.
4. double-frequency printing type yagi antenna according to claim 3, wherein this first driver is the dipole antenna perpendicular to this first direction, this dipole antenna includes one first radiation arm and one second radiation arm, is respectively formed at this first metal layer and this second metal level.
5. double-frequency printing type yagi antenna according to claim 3, wherein this second driver is the dipole antenna perpendicular to this first direction, this dipole antenna includes one first radiation arm and one second radiation arm, is respectively formed at this first metal layer and this second metal level.
6. double-frequency printing type yagi antenna according to claim 3, wherein this first director and this adaptation are formed on this first metal layer, and this reflector is formed on this second metal level.
7. double-frequency printing type yagi antenna according to claim 3, wherein this transmission line is a microstrip line.
8. double-frequency printing type yagi antenna according to claim 1, it separately includes a signal feed side, is formed on this transmission line and is coupled in one end of this reflector.
9. double-frequency printing type yagi antenna according to claim 1, wherein this reflector is couple to a ground end of this double-frequency printing type yagi antenna.
10. double-frequency printing type yagi antenna according to claim 1, wherein the length of this first driver and this second driver respectively to should the first frequency band and the wavelength of this second frequency band 1/2nd.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200910207353.8A CN102044756B (en) | 2009-10-26 | 2009-10-26 | Double-frequency printing type yagi antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910207353.8A CN102044756B (en) | 2009-10-26 | 2009-10-26 | Double-frequency printing type yagi antenna |
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| CN102044756A CN102044756A (en) | 2011-05-04 |
| CN102044756B true CN102044756B (en) | 2014-07-02 |
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| CN200910207353.8A Active CN102044756B (en) | 2009-10-26 | 2009-10-26 | Double-frequency printing type yagi antenna |
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| CN108288757B (en) * | 2017-12-29 | 2020-02-07 | 维沃移动通信有限公司 | Wireless mobile terminal and antenna |
| CN108232422B (en) * | 2017-12-29 | 2019-12-06 | 维沃移动通信有限公司 | Antenna and wireless mobile terminal |
| CN108923112B (en) * | 2018-09-14 | 2021-04-27 | 维沃移动通信有限公司 | Antenna device and terminal equipment |
| CN109244646B (en) * | 2018-09-14 | 2021-01-08 | 维沃移动通信有限公司 | Antenna device and terminal equipment |
| CN111384599A (en) * | 2018-12-27 | 2020-07-07 | 航天信息股份有限公司 | Yagi antenna |
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