WO1998001920A1 - Dispositif d'emission a antenne omnidirectionnelle - Google Patents
Dispositif d'emission a antenne omnidirectionnelle Download PDFInfo
- Publication number
- WO1998001920A1 WO1998001920A1 PCT/FR1997/001243 FR9701243W WO9801920A1 WO 1998001920 A1 WO1998001920 A1 WO 1998001920A1 FR 9701243 W FR9701243 W FR 9701243W WO 9801920 A1 WO9801920 A1 WO 9801920A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- strands
- antenna
- equi
- transmission device
- supply means
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
- H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
- H01Q11/08—Helical antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
Definitions
- the present invention relates to a transmission device with omnidirectional antenna.
- the device proposed by the invention particularly advantageously finds application for transmission on land mobiles or on satellites.
- An object of the invention is to propose a device allowing both emission in pure circular polarization, and omnidirectional coverage.
- omnidirectional antennas are already known. Mention may in particular be made of the slot antennas arranged on cylinders, and more particularly the biconical antennas, as well as the conical coil antennas, or also the dipole type antennas, for example those which have been described in the publications:
- the invention proposes a new type transmitting device with toroidal antenna having better polarization performance than the toroidal antennas of the prior art.
- Helical antennas are known for their transmission properties in circular polarization.
- the invention proposes, for its part, a transmission device whose antenna is of the helical strand type and which has an improved emission diagram compared to that of an antenna of the type described in
- the transmission device proposed by the invention comprises an antenna having a plurality of strands distributed regularly in a helix around the same cylindrical generator, as well as means for supplying said strands by a radiofrequency signal, and is characterized in that these supply means produce an equi-phase and equi-amplitude supply of said strands.
- the supply means comprise a coaxial cable which extends coaxially inside the antenna and which supplies the two strands of the latter in two-wire mode.
- the coaxial cable common to the different strands (which is small in order to avoid parasitic reflections which would destroy the quality of the polarization) is protected by a ferrite sheath.
- FIG. 1 illustrates a toric radiation, that is to say radiation as sought by
- FIG. 2 is a schematic perspective representation of a device according to a possible embodiment for the invention
- FIG. 3 illustrates an example of a radiation diagram obtained with the antenna of FIG. 2.
- the antenna illustrated in FIG. 2 is an antenna with four helical strands Bx to B 4 .
- the propellers of these four strands Bj to B 4 are identical and offset by ni 2 relative to each other.
- These four strands are for example wires wound on a cylindrical mandrel made of a dielectric material.
- this antenna using printed technology, the strands being printed on a dielectric support.
- the antenna includes means M for supplying these four strands Bj to B 4 in an equi-amplitude and equi-phase manner.
- these supply means M comprise a coaxial cable C which extends partly inside the propellers defined by the four strands Bi to B 4 and which makes it possible to convey a signal to said strands radio frequency generated by one U unit.
- the strands B *. to B 4 are connected to the ground of this coaxial cable C, while at their other end, these strands Bj to B 4 are connected to the outer braid of the coaxial C.
- the connections between the ends of the strands Bj to B 4 and coaxial cable C have not been shown so as not to overload Figure 2.
- the invention is not limited to antennas with four radiating strands, but applies more generally to any antenna with n strands. An even number of strands is preferred, however.
- This coaxial cable C is advantageously protected by a ferrite sheath G.
- Such a configuration indeed makes it possible to avoid the mass of the coaxial cable constituting a metallic obstacle which disturbs the emission.
- ferrite rings can be provided on the coaxial cable C distributed every ⁇ / 4 in the length of said cable, where ⁇ is the emission wavelength.
- phase control (balun" according to the English terminology conventionally used by those skilled in the art) distributed every ⁇ / 4 on the strands B-- . to B 4 . It will be noted that protection by a ferrite sheath is preferred because of its simplicity of implementation, in particular for ground uses.
- the strands have a diameter of 1 mm.
- ⁇ represents the angle of progression of each helical strand, Z r and Zi the real and complex impedances at the input of the antenna (SI units)
- the length of a strand is preferably less than the wavelength ⁇ . Beyond that, optimization is more difficult, even if it is possible to obtain trained diagrams.
- the impedance was that indicated in the previous table.
- the transmission frequency was 2000 MHz.
- This radiation diagram is related to a 9 m measurement sphere (far field).
- the circular polarization obtained was of high quality.
- the antenna which has just been described has a reduced manufacturing price. It will also be noted that the compactness of the antenna which has just been described makes it possible to envisage stacking one above the other, for example on the same mandrel, several antennas of this type supplied by the same coaxial, to increase the directivity of the air realized.
- the antenna is advantageously protected by a radioelectrically transparent radome.
- the antenna may be fixed to a vehicle by a dielectric mat which may be telescopically deployable or even made up of several elements fitted one on top of the other.
- the transmission device proposed by the invention is particularly suitable for all applications requiring omnidirectional emissions and in particular for emissions on spined mini satellites navigating in a geocentric reference point or even emissions from mobile earthly.
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Details Of Aerials (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97932866A EP0850496B1 (fr) | 1996-07-10 | 1997-07-09 | Dispositif d'emission a antenne omnidirectionnelle |
DE69711574T DE69711574T2 (de) | 1996-07-10 | 1997-07-09 | Sendevorrichtung mit rundstrahlender antenne |
US09/029,962 US6300916B1 (en) | 1996-07-10 | 1997-07-09 | Transmission device with omnidirectional antenna |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9608601A FR2751137B1 (fr) | 1996-07-10 | 1996-07-10 | Dispositif d'emission a antenne omnidirectionnelle |
FR96/08601 | 1996-07-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998001920A1 true WO1998001920A1 (fr) | 1998-01-15 |
Family
ID=9493897
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1997/001243 WO1998001920A1 (fr) | 1996-07-10 | 1997-07-09 | Dispositif d'emission a antenne omnidirectionnelle |
Country Status (5)
Country | Link |
---|---|
US (1) | US6300916B1 (fr) |
EP (1) | EP0850496B1 (fr) |
DE (1) | DE69711574T2 (fr) |
FR (1) | FR2751137B1 (fr) |
WO (1) | WO1998001920A1 (fr) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2953786A (en) * | 1958-06-04 | 1960-09-20 | Gen Electric | Antenna for polarized propagation |
US3263233A (en) * | 1962-05-07 | 1966-07-26 | Csf | Directive helical antenna having integral balun-feed |
DE1441599A1 (de) * | 1962-06-11 | 1969-02-20 | Chu Lan Jen | Wendelantenne |
DE1541461A1 (de) * | 1965-10-08 | 1969-10-09 | Csf | Antenne fuer Longitudinalwellen |
EP0320404A1 (fr) * | 1987-12-10 | 1989-06-14 | Centre National D'etudes Spatiales | Antenne de type hélice et son procédé de réalisation |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9603914D0 (en) * | 1996-02-23 | 1996-04-24 | Symmetricom Inc | An antenna |
-
1996
- 1996-07-10 FR FR9608601A patent/FR2751137B1/fr not_active Expired - Fee Related
-
1997
- 1997-07-09 DE DE69711574T patent/DE69711574T2/de not_active Expired - Lifetime
- 1997-07-09 WO PCT/FR1997/001243 patent/WO1998001920A1/fr active IP Right Grant
- 1997-07-09 EP EP97932866A patent/EP0850496B1/fr not_active Expired - Lifetime
- 1997-07-09 US US09/029,962 patent/US6300916B1/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2953786A (en) * | 1958-06-04 | 1960-09-20 | Gen Electric | Antenna for polarized propagation |
US3263233A (en) * | 1962-05-07 | 1966-07-26 | Csf | Directive helical antenna having integral balun-feed |
DE1441599A1 (de) * | 1962-06-11 | 1969-02-20 | Chu Lan Jen | Wendelantenne |
DE1541461A1 (de) * | 1965-10-08 | 1969-10-09 | Csf | Antenne fuer Longitudinalwellen |
EP0320404A1 (fr) * | 1987-12-10 | 1989-06-14 | Centre National D'etudes Spatiales | Antenne de type hélice et son procédé de réalisation |
Also Published As
Publication number | Publication date |
---|---|
EP0850496A1 (fr) | 1998-07-01 |
FR2751137B1 (fr) | 1998-11-06 |
FR2751137A1 (fr) | 1998-01-16 |
US6300916B1 (en) | 2001-10-09 |
DE69711574T2 (de) | 2002-11-21 |
DE69711574D1 (de) | 2002-05-08 |
EP0850496B1 (fr) | 2002-04-03 |
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