CN1710747A - Archimedian spiral antenna using photon band-gap as reflection chamber - Google Patents
Archimedian spiral antenna using photon band-gap as reflection chamber Download PDFInfo
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- CN1710747A CN1710747A CN 200410025222 CN200410025222A CN1710747A CN 1710747 A CN1710747 A CN 1710747A CN 200410025222 CN200410025222 CN 200410025222 CN 200410025222 A CN200410025222 A CN 200410025222A CN 1710747 A CN1710747 A CN 1710747A
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- reflection chamber
- spiral arm
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Abstract
In the invention, lengths and widths of two spiral arms are equal, and width is equal to interval between two spiral arms. Since absorbing material is added to a reflection cavity, thus wastage is introduced so as to cause low gain of antenna product. Therefore, new material of photon crystal is adopted in the invention. Since characters of frequency selectivity and zero phase reflection, photon crystal as reflection plane in high performance instead of reflection cavity is utilized to obtain unidirectional radiation. Mushroom shaped cavity of photon crystal adopted in the invention makes application result reach to desired requirement.
Description
Technical field:
The present invention relates to a kind of electromagnetic radiation system---antenna system, is the helical antenna system of relevant new material photonic crystal as emitter.
Background technology
Antenna is widely used in fields such as communication, broadcasting, military affairs.Because different applications and different application requirements, antenna also has polytype.Helical antenna is a kind of all channel antenna, and it also has various ways, cylindrical screw antenna, conical spiral antenna, Archimedian spiral antenna etc.Antenna often is subjected to the restriction of size, phase equalization to require height in actual applications, and requires versatility and flexibility, so antenna will have and can work in the very wide frequency band range with gratifying directional diagram, impedance and polarization characteristic.The linear oscillator antenna is very narrow, increases vibrator diameter some frequency bands of broadening a little, generally seldom can be greater than a few percent of designed centre frequency.The performance parameter of antenna is with frequency change generally speaking.One class antenna is arranged, and its geometry is stipulated by angle fully, performance and frequency-independent, and this class antenna is called frequency-independent antenna.Typical antenna has equiangular spiral antenna.Archimedian spiral antenna is not a frequency-independent antenna truly, but it also can be worked in very wide frequency band, because can not satisfying, it blocks requirement, electric current does not reduce behind the service area significantly, therefore helical antenna is blocked the back directional diagram must be influenced, must load endways and avoid wave reflection.
Typical antenna generally all is contained on the similar semiconductor lining material, as GaAs or InP.Yet the basic electromagnetic characteristic of having a look at this antenna will be seen its deficiency.In general in the middle of the electromagnetic energy of three-dimensional perspective radiation electric magnetic energy in radiation must some will be to the liner plate radiation.Flat plane antenna on a fast GaAs liner plate is big 46 times to the magnetic energy of space radiation to the magnetic energy ratio of liner plate radiation.Therefore must having greatly, energy is absorbed by liner plate.
General back cavity type Archimedian spiral antenna since the change of reflection cavity length the non-frequency dependent characteristic of helical antenna.Need in reflection cavity, add absorbing material and reduce resonance effect.Having introduced loss like this causes the gain of last antenna product very low.And alter a great deal at whole frequency scope internal antenna yield value.If with the spin substrate of antenna of photonic crystal, the characteristics of the selectivity of photonic crystal frequency and zero phase reflection have really realized the non-frequency characteristic of helical antenna, and have formed a kind of high performance novel low profile antenna.
Summary of the invention
The object of the invention just provides a kind of low section broad-band antenna of novelty.It adopts both arms Archimedian screw structure, and has adopted photonic crystal as the substrate reflection cavity, has very big antenna efficiency thereby reach in very wide frequency range.This antenna has that volume is little, bandwidth, characteristics that flexibility is good.
The present invention is a kind of both arms Archimedian spiral antenna, and the equation of two arms is respectively
ρ
1＝ρ
0+αφ
ρ
2＝ρ
02+αφ
ρ in the formula
0Be start radius, α is the spiral growth rate.
The width of arm is:
When the girth of spiral is near the wavelength regional, form the main radiation area of snail.When frequency changed, main radiation area changed thereupon, but directional diagram is constant substantially so helical antenna has broadband character.Corresponding lowest operating frequency, antenna must have the girth of 1.25 wavelength; To highest frequency, determine that they at interval also must be less than λ/4 by the size of space between feed.
When two spiral arm equate, and during the wide width that equals two spiral arm of arm, antenna has good directional diagram, impedance and polarization characteristic.
Adopt new material-photonic crystal for obtaining maximum antenna efficiency substrate of the present invention.This novel medium of the photonic crystal periodic structure that periodic arrangement is formed in another kind of medium can produce photon band gap.The photonic bandgap material of being made up of one dimension, two dimension, three-dimensional periodic unit that is surrounded by medium can stop electromagnetic wave on certain direction or the propagation on all directions.This shows that photonic band gap structure has unique frequency selective characteristic, and its frequency selective characteristic can be realized by the parameter of control cycle structure.The common planar antenna is owing to the transmission reason of substrate, to the energy of spatial emission very big loss arranged.If make substrate, because the electromagnetism wave energy is propagated the almost whole directive spaces of energy in substrate with photonic crystal.This has just changed the radiation characteristic of antenna, need not reflect with absorbing material just to be easy to obtain needed one-way radiation, and because photonic crystal frequency selectivity and zero phase reflect, really realize the non-frequency dependent characteristic of helical antenna.
The substrate that the present invention uses is a kind of metal and dielectric planar photonic bandgap electromagnetic structure of mushroom periodic structure.This structure by the metal protuberance thing of one deck square in the plane periodic arrangement form.The center of each positive square all has a vertical metal aperture to be connected with the metallic plate of bottom.It between top layer and bottom even continuous dielectric.
Description of drawings
Fig. 1 photon band gap flat helical antenna schematic diagram
Fig. 2 Archimedes flat helical antenna
The double-deck square spot figure of Fig. 3
Specific implementation method
Fig. 1 is the photon band gap flat helical antenna, and reflection chamber among the figure (7) is the photon band gap reflection chamber, and antenna (8) is the both arms Archimedian spiral antennas, and the both arms Archimedian spiral antenna is adhesive on the photon band gap liner plate.Photon band gap lining comprises two spiral arm, i.e. spiral arm (1) and spiral arm (2), and two arm lengths are equal, and width same-handed width is two width between the spiral.Along with the variation of angle, radius increases, and operating frequency of antenna descends.At the spiral girth is near the zone the wavelength, forms the main radiation area of snail.When frequency changed, main radiation area changed thereupon, and the frequency of different like this emitting area institute electromagnetic energy emitted also is inequality, corresponding in the present embodiment lowest operating frequency, and antenna must have the girth of 1.25 wavelength; To highest frequency, determine that they at interval also must be less than λ/4 by the size of space between feed.
Fig. 3 is the metal and dielectric planar photonic bandgap electronic structure as a kind of mushroom periodic structure of reflection chamber.This structure by the square metal protuberance thing of one deck in the plane periodic arrangement form.The center of each positive square all has a vertical metal aperture to be communicated with the metallic plate of bottom.Articulamentum between top layer and the bottom is uniform dielectric, and wherein metal level is a copper, and dielectric layer is an epoxy glass cloth laminated board.From in appearance, such structure similarly is " mushroom " that growth has many rules to arrange on metal level.The double-deck positive square spot figure metal and dielectric plane of being adopted as shown in Figure 4.Point 6 is metal aperture of being connected of metallic plate up and down, and last metallic plate is divided into one by one little metal square with medium, and lower floor is the monolith-type metallic plate.
The present invention has possessed the characteristic of broad-band antenna, and has good directional diagram, impedance and polarization characteristic.
Claims (3)
1 one kinds of all channel antennas is characterized by this all channel antenna and have comprised a both arms helical antenna and a photon band gap reflection chamber.
2 according to the described both arms helical antenna of claim 1, it is characterized in that:
2.1 two spiral arm appearance etc., the width of two spiral arm equates; The width of spiral arm equals the interval width between two spiral arm;
2.2 corresponding lowest operating frequency, antenna must have the girth of 1.25 λ (λ is a wavelength); To highest frequency, determine that it at interval also must be less than λ/4 (λ be a wavelength) by the size of space between feed.
3 according to the described photon band gap reflection chamber of claim 1, it is characterized in that: the metal and dielectric planar photonic bandgap electromagnetic structure that this photon band gap reflection chamber is a kind of mushroom periodic structure.This structure by the metal protuberance thing of one deck square in the plane periodic arrangement form.The center of each positive square all has a vertical metal aperture to be connected with the metallic plate of bottom.It between top layer and bottom even continuous dielectric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410025222 CN1710747A (en) | 2004-06-17 | 2004-06-17 | Archimedian spiral antenna using photon band-gap as reflection chamber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410025222 CN1710747A (en) | 2004-06-17 | 2004-06-17 | Archimedian spiral antenna using photon band-gap as reflection chamber |
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| CN1710747A true CN1710747A (en) | 2005-12-21 |
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| CN 200410025222 Pending CN1710747A (en) | 2004-06-17 | 2004-06-17 | Archimedian spiral antenna using photon band-gap as reflection chamber |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463289C (en) * | 2006-03-24 | 2009-02-18 | 厦门大学 | Plane helical microstrip antenna for 3G system mobile terminal |
| CN101719596B (en) * | 2009-12-25 | 2012-07-04 | 中国科学院光电技术研究所 | Single-feed source periodically arranged groove slot panel antenna |
| CN102593599A (en) * | 2012-02-29 | 2012-07-18 | 深圳光启创新技术有限公司 | Negative permeability metamaterial |
| CN101320845B (en) * | 2007-12-24 | 2012-11-21 | 中国科学院光电技术研究所 | High-directionality antenna adopting combination of electro-magnetic band gap structure and metal grid structure |
| CN104466387A (en) * | 2014-12-12 | 2015-03-25 | 上海上大鼎正软件股份有限公司 | Cassette type slot antenna |
| CN106207448A (en) * | 2016-08-26 | 2016-12-07 | 长安大学 | A kind of utilize three-D photon crystal as the dipole antenna of reflection substrate |
| CN109143462A (en) * | 2018-10-12 | 2019-01-04 | 西安邮电大学 | A kind of high birefringence dung beetle shape fibre core photonic crystal fiber |
-
2004
- 2004-06-17 CN CN 200410025222 patent/CN1710747A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463289C (en) * | 2006-03-24 | 2009-02-18 | 厦门大学 | Plane helical microstrip antenna for 3G system mobile terminal |
| CN101320845B (en) * | 2007-12-24 | 2012-11-21 | 中国科学院光电技术研究所 | High-directionality antenna adopting combination of electro-magnetic band gap structure and metal grid structure |
| CN101719596B (en) * | 2009-12-25 | 2012-07-04 | 中国科学院光电技术研究所 | Single-feed source periodically arranged groove slot panel antenna |
| CN102593599A (en) * | 2012-02-29 | 2012-07-18 | 深圳光启创新技术有限公司 | Negative permeability metamaterial |
| CN102593599B (en) * | 2012-02-29 | 2015-02-04 | 深圳光启高等理工研究院 | Negative permeability metamaterial |
| CN104466387A (en) * | 2014-12-12 | 2015-03-25 | 上海上大鼎正软件股份有限公司 | Cassette type slot antenna |
| CN106207448A (en) * | 2016-08-26 | 2016-12-07 | 长安大学 | A kind of utilize three-D photon crystal as the dipole antenna of reflection substrate |
| CN109143462A (en) * | 2018-10-12 | 2019-01-04 | 西安邮电大学 | A kind of high birefringence dung beetle shape fibre core photonic crystal fiber |
| CN109143462B (en) * | 2018-10-12 | 2021-04-13 | 西安邮电大学 | High-birefringence dung beetle-shaped fiber core photonic crystal fiber |
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Open date: 20051221 |