EP1825565A1 - Perfectionnement aux antennes a bandes interdites photoniques - Google Patents
Perfectionnement aux antennes a bandes interdites photoniquesInfo
- Publication number
- EP1825565A1 EP1825565A1 EP05818906A EP05818906A EP1825565A1 EP 1825565 A1 EP1825565 A1 EP 1825565A1 EP 05818906 A EP05818906 A EP 05818906A EP 05818906 A EP05818906 A EP 05818906A EP 1825565 A1 EP1825565 A1 EP 1825565A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- source
- rods
- height
- antenna according
- antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/44—Resonant antennas with a plurality of divergent straight elements, e.g. V-dipole, X-antenna; with a plurality of elements having mutually inclined substantially straight portions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/006—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces
- H01Q15/0066—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces said selective devices being reconfigurable, tunable or controllable, e.g. using switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
Definitions
- the present invention relates to photonic bandgap antennas.
- Photonic bandgap structures are known by the abbreviation BIP, generally by the term "Photonic Band Gap Structure” or PBG structure in English, for periodic structures that prohibit the propagation of a wave for certain frequency bands . Structures were first used in the optical field, but in recent years their application has been extended to other frequency ranges. Photonic bandgap structures are used in particular in microwave devices such as filters, antennas or the like.
- the present invention relates to a photonic band gap structure using metal elements, more particularly parallel rods perfectly conducting and arranged periodically.
- This article studies more particularly the directivity and the resistance to radiation for a certain range of frequencies of a resonant antenna (MPBG) comprising a linear radiation source antenna and a cavity constructed in a metallic photonic structure formed of parallel metallic rods, the cavity being obtained by eliminating some rods around the source antenna.
- MPBG resonant antenna
- the present invention relates to a photonic band gap antenna (BIP) which is made with metal rods of finite length, the height of the rods relative to the substrate receiving the radiating source being controlled so as to control the radiation pattern of the antenna in the vertical plane.
- BIP photonic band gap antenna
- the present invention relates to a photonic bandgap antenna (BIP) having, in a plane of x, y directions, a radiating source and a photonic bandgap structure consisting of parallel metal rods, perpendicular to the plane, the rods of diameter d. repeating nx times with a period x in the x direction and n y times with a period y in the y direction, characterized in that the height of the rods seen from the radiating source is increasing.
- BIP photonic bandgap antenna
- the height of the rods between the source and the outermost rod is chosen to be greater than kh / n, n being equal to the number of stems seen from the source, h being the height of the outermost stem and k an integer varying between 1 and n.
- the height of the first metal rods seen by the source is chosen to be greater than 3 ⁇ 1 where I is the height of the radiating source.
- I is the height of the radiating source.
- the BIPM effect is obtained, ie one obtains as a function of the period at a given frequency bandwidths and forbidden.
- the heights of the rods between the source and the outermost rod follow an increasing monotonous function.
- the numbers of rods are identical. They are chosen such that n> 3.
- the numbers of stems seen from the source can be different, which gives numbers nx and ny of stems having different values.
- the reproduction periods x and y of the metal rods in the x and y directions are chosen to be identical. However, these periods a x and a y may be different.
- the stems are made of a metal material having a conductivity greater than 10 "7 such as copper (5.9.10 7 S / m), silver (4.1.10 7 S / m), aluminum (3.5.10 7 S / m) or similar.
- the source is constituted by a vertical dipole or monopole attached to the substrate forming ground plane. The source is positioned in place of one of the metal rods or between the metal rods.
- FIG. 3 is a diagram showing the bandwidths and forbidden bands of a photonic bandgap antenna as a function of the operating frequency and the period.
- FIG. 4 shows schematically in A a 3D view and in B a top view of a photonic bandgap antenna, according to an embodiment of the present invention
- FIG. 5 shows three configurations of photonic bandgap antennas with metal rods of different height according to the views with, for each of the configurations, a radiation pattern in elevation and a 3D radiation pattern.
- FIG. 1 represents an antenna 1 consisting of a dipole 10, positioned in the middle of a photonic bandgap structure (BIP), formed of metal rods 11 of finite height (referenced to the BIPM structure).
- the metal rods are made of a material having a conductivity greater than 10 -7 such as copper, silver, aluminum or the like.
- the metal rods 11 are arranged in 7 rows of 7 elements, the rows and the elements being spaced from each other by a distance a giving the pitch or the period of the photonic bandgap structure.
- Radiation diagrams show the effect of the BIPM structure on the radiation pattern of a dipole antenna. Indeed, the presence of a metallic BIP structure shows at the working frequency preferred directions of radiation at 0 °, 90 °, 180 ° and 270 ° and radiation minima at 45 °, 135 °, 225 °, 315 °.
- the height of the metal rods of FIG. 1A has been modified so that, from the source, the heights of the rods are increasing.
- the use of the height-adjustable rods allows the control of the elevation radiation pattern while maintaining the same azimuth pattern.
- FIG. 5 there is shown a photonic bandgap antenna in which the source 10 sees three metal rods of height h which are identical and identical.
- the elevation radiation pattern exhibits several minima due to passing or blocking behaviors of the metal photonic band gap structure for the apparent period in the considered direction.
- This diagram is similar to the diagram in Figure 2B.
- the 3D radiation pattern has along the z axis a radiation lobe. Indeed, when the rods are of constant heights h, the radiation pattern is preserved in the xOy plane but evolves in the xOz plane as a function of h.
- the height of the 3 metal rods seen by the source 10 is different from one rod to the other and increasing so that H3 ⁇ H2 ⁇ H1.
- the heights H3, H2, H1 can follow an increasing monotonous function.
- the height of the rods H3, H2, H1 between the source and the outermost rod (H1) is chosen to be greater than kH1 / n, n being equal to the number of rods seen from the source (3). in the embodiment shown), H1 the height of the outer rod and k an integer varying between 1 and n.
- the height H3 must be at least 3 x I where I is the height of the radiating source.
- the source 10 has three metal rods whose height is increasing from the source towards the outer rod H'1 rectifc H'3 ⁇ H'2 ⁇ H'1.
- the size of the metal rods substantially follows the equation given above.
- the elevation diagram of FIG. 5C shows a significant decrease in the secondary lobes due to the particular structure of the metallic BEP, which is also found on the 3D diagram.
- the present invention has been described with reference to an antenna in which the source is positioned in place of a metal rod in the center of the metallic BIP structure. However, it is possible to position the source between the rods. On the other hand, the source may be off-center in the photonic band gap structure.
- the source used in the embodiments described above is a dipole. However, in a practical embodiment, a vertical monopoly mounted on a ground plane substrate is used in which the metal rods of the BIPM structure are also mounted.
- the number of rods in the x direction may be the same or different from the number of rods in the y direction.
- the periodicity a x and y between the rods along the x or y directions may be identical, as in the described embodiments, or different.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0452947A FR2879356A1 (fr) | 2004-12-13 | 2004-12-13 | Perfectionnement aux antennes a bandes interdites photoniques |
PCT/FR2005/050985 WO2006064140A1 (fr) | 2004-12-13 | 2005-11-24 | Perfectionnement aux antennes a bandes interdites photoniques |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1825565A1 true EP1825565A1 (fr) | 2007-08-29 |
EP1825565B1 EP1825565B1 (fr) | 2009-08-19 |
Family
ID=34955398
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05818906A Expired - Fee Related EP1825565B1 (fr) | 2004-12-13 | 2005-11-24 | Perfectionnement aux antennes a bandes interdites photoniques |
Country Status (8)
Country | Link |
---|---|
US (1) | US7719478B2 (fr) |
EP (1) | EP1825565B1 (fr) |
JP (1) | JP2008523676A (fr) |
KR (1) | KR20070086011A (fr) |
CN (1) | CN101073183A (fr) |
DE (1) | DE602005016147D1 (fr) |
FR (1) | FR2879356A1 (fr) |
WO (1) | WO2006064140A1 (fr) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1239223A (fr) * | 1984-07-02 | 1988-07-12 | Robert Milne | Antenne reseau adaptative |
US5689275A (en) * | 1995-05-16 | 1997-11-18 | Georgia Tech Research Corporation | Electromagnetic antenna and transmission line utilizing photonic bandgap material |
US6483640B1 (en) * | 1997-04-08 | 2002-11-19 | The United States Of America As Represented By The Secretary Of The Navy | Optical notch filters based on two-dimensional photonic band-gap materials |
GB0015895D0 (en) * | 2000-06-28 | 2000-08-23 | Plasma Antennas Limited | An antenna |
US7117133B2 (en) * | 2001-06-15 | 2006-10-03 | Massachusetts Institute Of Technology | Photonic band gap structure simulator |
FR2863109B1 (fr) * | 2003-11-27 | 2006-05-19 | Centre Nat Rech Scient | Antenne a diagramme de rayonnement d'emission/reception configurable et orientable, station de base correspondante |
-
2004
- 2004-12-13 FR FR0452947A patent/FR2879356A1/fr not_active Withdrawn
-
2005
- 2005-11-24 CN CNA2005800417019A patent/CN101073183A/zh active Pending
- 2005-11-24 WO PCT/FR2005/050985 patent/WO2006064140A1/fr active Application Filing
- 2005-11-24 KR KR1020077013103A patent/KR20070086011A/ko not_active Application Discontinuation
- 2005-11-24 DE DE602005016147T patent/DE602005016147D1/de active Active
- 2005-11-24 JP JP2007544952A patent/JP2008523676A/ja not_active Withdrawn
- 2005-11-24 EP EP05818906A patent/EP1825565B1/fr not_active Expired - Fee Related
- 2005-11-24 US US11/791,691 patent/US7719478B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2006064140A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1825565B1 (fr) | 2009-08-19 |
FR2879356A1 (fr) | 2006-06-16 |
JP2008523676A (ja) | 2008-07-03 |
DE602005016147D1 (de) | 2009-10-01 |
KR20070086011A (ko) | 2007-08-27 |
CN101073183A (zh) | 2007-11-14 |
US20080191962A1 (en) | 2008-08-14 |
WO2006064140A1 (fr) | 2006-06-22 |
US7719478B2 (en) | 2010-05-18 |
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