EP1825566A1 - Perfectionnement aux antennes a bandes interdites photoniques actives - Google Patents
Perfectionnement aux antennes a bandes interdites photoniques activesInfo
- Publication number
- EP1825566A1 EP1825566A1 EP05819420A EP05819420A EP1825566A1 EP 1825566 A1 EP1825566 A1 EP 1825566A1 EP 05819420 A EP05819420 A EP 05819420A EP 05819420 A EP05819420 A EP 05819420A EP 1825566 A1 EP1825566 A1 EP 1825566A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rods
- discontinuous
- antenna
- rod
- source
- 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
- 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
Definitions
- the present invention relates to active 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 . These structures were first used in the optical field, but in recent years their application has spread 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 which are perfectly conducting and arranged periodically, some of the rods being formed of sections connected by a switching element which, depending on its state, makes the stem continuous or discontinuous.
- an antenna consisting of a source placed in the center of a photonic bandgap structure composed of metal rods formed of rod sections interconnected by a PIN diode to switch from the continuous state to the discontinuous state.
- This is called an active photonic band gap antenna.
- the present invention relates to an improvement to an active photonic band gap antenna (BIP) which is carried out with metal rods of finite length, some of which are formed of sections interconnected by a switching element which makes it possible to make the rod continuous or discontinuous.
- BIP active photonic band gap antenna
- the present invention relates to an active photonic band gap antenna (BIP) having, in a plane of x, y directions, a radiating source and a photonic band gap structure constituted by parallel metal rods, perpendicular to said plane, the diameter rods. d repeating n x times with a period a x in the x direction and n y times with a period y in the y direction, the rods being constituted by continuous rods and discontinuous rods formed by at least 2 sections connected by a switching element making the rod continuous or discontinuous, characterized in that one of the rods of at least one row of rods viewed from the radiating source is a discontinuous rod.
- BIP active photonic band gap antenna
- the discontinuous rod comprises a number of sections t such that t> 2.
- the length L of a section is equal to ⁇ 0/2 where ⁇ 0 is the wavelength at the operating frequency of the antenna.
- the discontinuous rod corresponds to the outer stem of a row of stems seen by the source.
- the source is a monopole mounted on a ground plane on which the rods are also mounted, a DRA (for Dielectric Resonator Antenna) mounted on a ground plane, a dipole or the like.
- the rods are made of a metallic material such as copper, silver, aluminum or the like.
- the switching element is selected from PIN diodes or MEMs for MicroElectroMechanical Systems
- FIG. 1 is a very schematic view of a photonic band gap antenna according to the prior art with its 3D radiation pattern
- FIG. 2 is a view identical to that of FIG. 1 in the case of a photonic bandgap antenna according to one embodiment of the present invention.
- FIG. 3 is a perspective view of a discontinuous rod used in the present invention. invention
- FIG. 4 schematically represents the four possible directions for the discontinuous rods and the corresponding radiation diagrams.
- FIG. 5 schematically represents the different possible locations for the discontinuous rods in a given direction, as well as the corresponding radiation diagrams.
- Fig. 6 schematically shows an alternative embodiment of the present invention.
- a forbidden band antenna photonics according to the prior art.
- the BIPM period a is such that the plane wave characterization has its first propagation peak at the above frequency.
- Its radiation pattern as shown in Figure 1 is then rosette-shaped with four main lobes in the directions (0 °, 90 °, 180 ° and 270 °).
- This antenna has preferred directions of radiation when the BIPM structure traversed in this direction is busy.
- this antenna has radiation minima when the crossed BIPM structure is blocking.
- This blocking or passing state is deduced from an ancillary simulation called plane wave characterization known to those skilled in the art.
- the characterization under wave consists of illuminating metallic rods of infinite dimensions along the Z axis under plane wave.
- a BIPM structure characterized by a plane wave has a bandwidth at this frequency.
- this operation is obtained when a height of metal rods is respected, namely H> 1.5A 0 .
- the first metal rod 3 of two contiguous rows of metal rods seen from the source 1 is a discontinuous rod according to the direction explained below, namely a rod formed of at least 2 sections connected by a switching element which can be on or off such as a PIN diode or a MEMS-based switch (Micro Electro Mechanical System).
- the energy radiated by the source 1 in the middle of the active BIPM structure does not propagate in the direction where the two discontinuous rods are located, the BIPM structure being blocking, and one obtains a radiation pattern as shown in FIG. Figure 2 with a preferred direction of radiation opposite the direction in which the stems are discontinuous.
- This dual operation between the continuous and discontinuous rods is obtained when the length of the sections L of the metal rods forming the discontinuous rods is of the order of half the wavelength.
- fo 5.25GHz
- L 28.6mm.
- Figure 3 shows a discontinuous rod and the relationship to link "H", the total height of the discontinuous rod geometric parameters of the discontinuous rod. These parameters are “L”, the length of the metal sections, “n e ", the number of discontinuities and "e”, the size of the discontinuity. So we get the equation:
- FIG. 4 two discontinuous rods 3 are positioned respectively along the 4 directions surrounding the source.
- the rods obtain four possible configurations. for the radiation pattern, as shown in the figure.
- the discontinuous rods 3 are, for the same direction, positioned according to three different arrangements, namely respectively on the first line seen by the source 1, on the second line and on the third line or external line.
- This last solution facilitates the realization of the antenna because the control due to the switching element such as a PIN diode is made easier by being performed on the outside of the BIPM structure.
- FIG. 6 shows a BIPM antenna with 3 discontinuous rods 3 surrounding the source 1 on three sides, the other rods being continuous rods 2. With this structure, the radiation diagram shown in FIG. 6 is obtained with 12 dB directivities.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0452965A FR2879357A1 (fr) | 2004-12-14 | 2004-12-14 | Perfectionnement aux antennes a bandes interdites photoniques |
PCT/FR2005/050986 WO2006064141A1 (fr) | 2004-12-14 | 2005-11-24 | Perfectionnement aux antennes a bandes interdites photoniques actives |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1825566A1 true EP1825566A1 (fr) | 2007-08-29 |
EP1825566B1 EP1825566B1 (fr) | 2012-06-06 |
Family
ID=34955399
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05819420A Expired - Fee Related EP1825566B1 (fr) | 2004-12-14 | 2005-11-24 | Perfectionnement aux antennes a bandes interdites photoniques actives |
Country Status (7)
Country | Link |
---|---|
US (1) | US7864132B2 (fr) |
EP (1) | EP1825566B1 (fr) |
JP (1) | JP2008523753A (fr) |
CN (1) | CN101069326A (fr) |
BR (1) | BRPI0518843A2 (fr) |
FR (1) | FR2879357A1 (fr) |
WO (1) | WO2006064141A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104518274B (zh) * | 2013-09-26 | 2017-11-07 | 北京壹人壹本信息科技有限公司 | 天线、天线制造方法以及移动终端 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4728805A (en) * | 1986-11-10 | 1988-03-01 | California Microwave, Inc. | Synaptic radio frequency interactive systems with photoresponsive switching |
US5293172A (en) * | 1992-09-28 | 1994-03-08 | The Boeing Company | Reconfiguration of passive elements in an array antenna for controlling antenna performance |
JP3491682B2 (ja) * | 1999-12-22 | 2004-01-26 | 日本電気株式会社 | 線状アンテナ |
US6859304B2 (en) * | 2002-08-09 | 2005-02-22 | Energy Conversion Devices, Inc. | Photonic crystals and devices having tunability and switchability |
-
2004
- 2004-12-14 FR FR0452965A patent/FR2879357A1/fr active Pending
-
2005
- 2005-11-24 WO PCT/FR2005/050986 patent/WO2006064141A1/fr active Application Filing
- 2005-11-24 JP JP2007546130A patent/JP2008523753A/ja not_active Withdrawn
- 2005-11-24 EP EP05819420A patent/EP1825566B1/fr not_active Expired - Fee Related
- 2005-11-24 US US11/793,091 patent/US7864132B2/en not_active Expired - Fee Related
- 2005-11-24 CN CN200580041322.XA patent/CN101069326A/zh active Pending
- 2005-11-24 BR BRPI0518843-1A patent/BRPI0518843A2/pt not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2006064141A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2008523753A (ja) | 2008-07-03 |
FR2879357A1 (fr) | 2006-06-16 |
US7864132B2 (en) | 2011-01-04 |
EP1825566B1 (fr) | 2012-06-06 |
WO2006064141A1 (fr) | 2006-06-22 |
US20090096695A1 (en) | 2009-04-16 |
BRPI0518843A2 (pt) | 2008-12-09 |
CN101069326A (zh) | 2007-11-07 |
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