WO2002023673A1 - Antenne helicoïdale a pas variable, et procede correspondant - Google Patents
Antenne helicoïdale a pas variable, et procede correspondant Download PDFInfo
- Publication number
- WO2002023673A1 WO2002023673A1 PCT/FR2001/002873 FR0102873W WO0223673A1 WO 2002023673 A1 WO2002023673 A1 WO 2002023673A1 FR 0102873 W FR0102873 W FR 0102873W WO 0223673 A1 WO0223673 A1 WO 0223673A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- width
- strands
- helical antenna
- antenna
- antenna according
- Prior art date
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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
Definitions
- Variable pitch helical antenna and method thereof.
- the field of the invention is that of wide bandwidth antennas with a hemispherical or quasi-hemispherical radiation pattern. More specifically, the invention relates to helical antennas of this type.
- the antenna of the invention finds applications in particular in the context of mobile satellite communications between fixed users and / or mobiles of any type, for example aeronautical, maritime or terrestrial. In this area, several satellite communication systems are implemented, or are currently under development (for example the INMARSAT, INMARSAT-M, GLOBALSTAR systems, etc.). These antennas are also of interest in the deployment of personal communication systems (PCS) by geostationary satellites.
- PCS personal communication systems
- the aim of these systems is to provide land users with new communications services (multimedia, telephony) via satellites.
- new communications services multimedia, telephony
- geostationary or moving satellites they provide global ground coverage. They must be similar to terrestrial cellular systems in terms of cost, performance and size.
- the antenna located on the user's terminal is a key element from the point of view of the reduction in size.
- the very different incidences of the signals received or transmitted require the antennas to have a radiation diagram with hemispherical or quasi-hemispherical coverage.
- the polarization must be circular
- the invention can find applications in all systems requiring a small antenna, the use of a wide band and circular polarization.
- the antennas must often have the above characteristics either in a very wide bandwidth, of the order of 10%, or in two neighboring sub-bands corresponding respectively to reception and to program. It is also essential that the size, and the weight, be reduced as much as possible.
- a quadrifilar antenna is formed by four radiating strands.
- An exemplary embodiment is described in detail in the document "Analysis of quadrifilar resonant helical antenna for mobile communications", by A. Sharaiha and C. Terret (IEE - Proceedings H, vol. 140, no.4, August 1993).
- the radiating strands are printed on a thin dielectric substrate, then wound on a cylindrical support transparent from the radioelectric point of view.
- the four strands of the propeller are open or short-circuited at one end and electrically connected at the other end.
- This antenna requires a supply circuit, which ensures the excitation of the different antenna strands by signals of the same amplitude in phase quadrature.
- This function can be performed using 3dB -90 ° coupler structures and a hybrid ring.
- This assembly can be produced in printed circuit and placed at the base of the antennas. A simple but bulky supply is thus obtained.
- the antenna including its feed
- This miniaturization solution consists in increasing the permittivity of the cylindrical support around which the substrate is wound.
- This technique makes it possible to obtain a reduction in height of the order of 30%. It also has a good simplicity of implementation. On the other hand, it has the drawback of reducing the bandwidth. In addition, it is expensive.
- the height of the antenna can be reduced by cutting each strand into two separate parts of length of approximately ⁇ / 4 with symmetry with respect to the middle of each strand.
- This technique is notably described in the article by D.F. Filipovic, M. Ali Tassoudji, E. Ozaki: “A coupled-segment quadrifilar helical antenna” (MTT-S Symposium on technologies for wireless applications, Vancouver, Canada, 1997).
- the known techniques for reducing the height of the antenna have major shortcomings in terms of characteristics.
- the reduction operation leads to deterioration of the bandwidth and / or of the ellipticity ratio.
- This antenna called printed quadrifilar helix antenna (HQI)
- HQI printed quadrifilar helix antenna
- This antenna has characteristics close to the stated criteria, in a frequency band generally limited to 6 or 8% for an ROS less than two.
- Wider band operation can be achieved by using dual-layer HQI antennas.
- These antennas are formed by the concentric "nesting" of two coaxial resonant quadrifilar helices, electromagnetically coupled. The assembly functions as two coupled resonant circuits, the coupling of which deviates the resonant frequencies.
- a two-layer resonant quadrifilar helical antenna is thus obtained, according to the technique described in FR - 89 14952.
- This technique has the advantage of requiring a single supply system, and of allowing dual-band and broadband operation. However, it has the disadvantage of requiring the production of two printed and nested circuits, and of offering only a small bandwidth in each sub-band.
- a quadrifilar antenna is formed by four radiating strands.
- An exemplary embodiment is described in detail in the document "Analysis of quadrifilar resonant helical antenna for mobile communications" (analysis of the resonant quadrifilar helix antenna for communications with mobiles), by A. Sharaiha and C. Terret (IEE - Proceedings H, vol. 140, n ° 4, August 1993).
- the radiating strands are printed on a thin dielectric substrate, then wound on a cylindrical support transparent from the radioelectric point of view.
- the four strands of the propeller are open or short-circuited at one end and electrically connected at the other end.
- This antenna requires a supply circuit, which ensures the excitation of the different antenna strands by signals of the same amplitude in phase quadrature.
- This function can be performed using 3dB -90 ° coupler structures and a hybrid ring.
- This assembly can be produced in printed circuit and placed at the base of the antennas. A simple but bulky supply is thus obtained.
- the antenna including its feed
- an objective of the invention is to provide a resonant helical antenna of reduced size, and having a wide passband and / or two passbands, covering the transmit band and the receive band of a communication system.
- an objective of the invention is to provide such a helical antenna, the dimensions, performance and cost of which are adapted (therefore at least similar) to portable terminals of terrestrial cellular systems. In this approach, the size and weight of the antenna are crucial aspects.
- an objective of the invention is to provide a resonant helical antenna having a wide bandwidth and / or two bandwidths, covering the transmission band and the reception band of a communication system. communication.
- an objective of the invention is to provide such a helical antenna having a large bandwidth (greater than that obtained according to the prior art) in each sub-band, when two sub-bands are provided.
- Another objective of the invention is to provide such an antenna whose dimensions, performance and cost are adapted (therefore at least similar) to portable terminals of terrestrial cellular systems.
- Another objective of the invention is to provide characteristics close to or better than those of double helix antennas (more complex to produce) with a single helix.
- This new and inventive approach makes it possible to obtain a good reduction in the size of the antenna (compared to a conventional antenna with strands at constant winding angle), the manufacturing and the cost remaining identical.
- said strands are printed on a substrate.
- This manufacturing method known per se, is both simple and effective.
- at least one of said propellers is a quadrifilar propeller, comprising four strands.
- the strands forming a helix all have the same geometric characteristics.
- strands different from each other can be envisaged.
- the lengths of the segments can be any, and be identical or distinct.
- the number of segments per strand is arbitrary, as well as the winding angle of each segment (between 0 ° and 90 °).
- the invention also relates to a method for determining the winding angles of strand segments of a helical antenna as described above.
- a method advantageously implements a global optimization step, selecting winding angle values by: (i) determining possible winding angle values, randomly or pseudo-randomly; (ii) repeating step (i) as long as said possible winding angle values do not make it possible to obtain a radiation pattern in main and cross polarization contained in a predetermined template.
- This method can in particular implement a global optimization program, belonging for example to the group comprising the simulated annealing and the genetic algorithm.
- At least one of said segments of at least one of said strands has a variable width.
- the antenna thus obtained has a larger bandwidth (in one or two sub-bands) than the conventional antenna, with strands of constant width, hereinafter called the reference antenna, without increasing the manufacturing complexity or the cost price. It should be noted that this aspect of the invention also applies to antennas whose strands more conventionally comprise a single segment.
- the width of said variable width segment (s) varies monotonously between a maximum width and a minimum width.
- said segments of variable width are such that the width of said segment or width to which they belong varies monotonously between a maximum width (D1) and a minimum width (D2).
- the end having said maximum width is connected to a line of attack of a supply circuit, the end having said minimum width being open.
- the width of said strand (s) of variable width varies regularly.
- said width can follow a law belonging to the group comprising: - linear laws; exponential laws; double exponential laws; the staircase laws. According to yet another approach, it can be provided that the width of said strand (s) of variable width varies irregularly.
- the dimensions of said strands are determined so as to provide a wide passband, greater than 8% (and more generally than that of the reference antenna, with strands of constant width) for an ROS less than 2.
- the dimensions of said strands are determined so as to provide a double bandwidth.
- the bandwidths of each sub-band are wider than that of the reference antenna.
- Figures 1 and 2 illustrate a quadrilateral helical antenna of known type, with conventional strands of constant width, respectively when the propeller is developed (Figure 1) and when it is wound on a cylindrical support ( Figure 2);
- FIG. 3 is an example of a propeller according to the invention, in its developed form
- Figure 4 also presents in its developed form, a conventional propeller having the same characteristics as the propeller of Figure 3;
- FIG. 5 shows a front view of the propeller of Figure 3, wound on its cylindrical support
- FIG. 6 illustrates the radiation pattern of the antenna of Figure 5 in circular polarization (main and cross components);
- Figures 7a and 7b show the measured input impedance of the antenna of Figure 5, respectively the Smith chart ( Figure 7a) and R.O.S ( Figure 7b);
- FIG. 8 shows the measured R.O.S of the antenna of Figure 5 as a function of frequency
- FIG. 9 to 12 illustrate the radiation patterns measured in rotating polarization ( Figures 9 and 11) and the ellipticity ratios ( Figures 10 and 12), at frequencies:
- FIG. 13 is an example of a propeller with strands of variable width, in its developed form
- - Figure 14 shows a front view of the propeller of Figure 13, wound on its cylindrical support;
- - Figure 15 illustrates an example of ROS measured at the input of a strand for a conventional antenna: strands of constant width (dotted lines) and for an antenna according to the invention (solid line);
- Figures 16A and 16B are radiation diagrams measured in circular polarization at the frequencies 1.6 GHz (Figure 6A) and 2.55 GHz (Figure 6B), for the embodiment corresponding to Figure 15;
- Figures 17 A and 17B are two examples of a propeller strand combining the aspects of Figures 3 and 13.
- Figures 1 and 2 show a conventional quadrilateral helix antenna, as already discussed in the preamble. It comprises four strands 11, 11 4 of length 12 and width d. These radiating strands are printed on a thin dielectric substrate L2 then wound on a cylindrical support 13 transparent from a radioelectric point of view, of radius r, of circumference c and of axial length L1, and being the winding angle.
- the antenna requires a supply circuit which ensures the excitation of the different strands by signals of the same amplitude and in phase quadrature. This function can be obtained from 3dB -90 ° coupler structures and a hybrid ring, made in printed circuit and placed at the base of the antennas.
- the object of the invention is in particular to obtain an HQI antenna operating in a wide bandwidth and / or in two sub-bands covering the transmission and reception band of the communications systems.
- FIG. 3 shows an example of a propeller according to the invention, in its developed form.
- the HQI antenna therefore comprises 4 conductive strands 31, 31 to 4 regularly spaced, printed on the substrate 32.
- the four strands are open at one end and connected at the other end to the lines of attack of the supply circuit 33.
- each strand (or at least some) of the HQI antenna is broken down into a limited number of segments. From the expressions Mathematics linking the geometrical parameters of a helical antenna, one notes that a modification of the angle of winding influences the pitch of the antenna, therefore on the axial length.
- the winding angle ⁇ is also a parameter influencing the radiation pattern of an HQI antenna (opening angle at 3dB, ellipticity ratio).
- a global optimization program such as the simulated annealing presented by Corona, as described in particular on http: //www.netlib.0rg/0pt/simann.f, or the genetic algorithm presented in the work of Y. Rahmat-Samii, E. Michielssen: "Electromagnetic Optimization by genetic algorithms” (Wiley series in microwave and optical engineering, Wiley-Interscience 1999) can be used.
- the synthesis is carried out on the radiation patterns in main and cross polarization by introducing a template defined by the amplitude levels and the opening angles -3dB desired.
- This template makes it possible to perfectly control the opening angles at -3dB, as well as the rejection of the polarization therefore reverses the ellipticity ratio.
- the variables to be optimized are the different winding angles of the strands of the HQI antenna. The algorithm will give the optimum angles 0Cj.
- FIG. 3 shows the developed antenna thus obtained, each strand (31, at
- Figure 4 shows an HQI antenna with constant pitch having the same radio characteristics.
- the winding angle of this HQI antenna with constant pitch is 54.5 °.
- the height of this conventional type antenna is 78 mm.
- the technique of the invention therefore allows a reduction in the axial length of 14%, with equal radio characteristics.
- Figure 5 shows a side view of the antenna of Figure 3, once wound on its support.
- FIG. 6 shows the imposed template 61 and the radiation diagram in circular polarization (main components 62 and cross 63) obtained with the HQI antenna, the winding angles of which were chosen randomly by a simulated annealing algorithm. We see that the radiation diagram is perfectly included in the imposed template 61.
- a bandwidth of around 8.5% is obtained for an R.O.S. less than 2. It should be noted that the bandwidth of a conventional constant-pitch antenna is of the same order.
- the invention provides a solution for reducing the dimensions of the HQI antenna without degrading its radio performance, by a random modification of the antenna pitch. We thus obtain a new antenna
- the technique of the invention therefore gives a non-negligible increase in bandwidth.
- This gives a printed quadrilateral helical antenna operating in a wide bandwidth and in two different sub-bands with a wide bandwidth, the height of which is reduced.
- the variation in the width of the strands therefore increases the bandwidth of the antenna without reducing the lengths of strands.
- Many variants of this embodiment are possible.
- the number, the length, the width and the angles of winding of the segments can be arbitrary (it being understood that only certain combinations are effective).
- the invention can be applied to any type of helical antenna, and not only to quadrilateral antennas. It can also be envisaged that the strands do not all have identical dimensions.
- the antenna is printed flat, then wound on a support to form the antenna.
- the substrate intended to receive the printed elements can be produced directly in its final cylindrical shape. In this case, the printing of the strands and of the supply structure is carried out directly on the cylinder.
- the antenna of the invention also lends itself to the production of antenna arrays. It is also possible to show coaxially and concentrically two
- the technique of the invention is compatible with techniques aimed at widening the bandwidth (s), such as in particular that described below.
- the width variation can be applied to all the segments, or selectively to some of them.
- FIG. 13 shows an example of a propeller with variable strand width according to one aspect of the invention, in its developed form.
- the HQI antenna therefore has 4 conductive strands 13 l x 131 4 regularly spaced, printed on the substrate
- the four strands are open at one end of width D2 and connected at the other end of width D1 to the leading lines of the supply circuit 133.
- the variation in the width of strands D1 to D2 can be regular as indicated in the figure or non-regular.
- the antenna is then wound on a cylindrical support, as illustrated in FIG. 14, which presents a front view of the antenna wound on its cylindrical support.
- the antenna produced has the following characteristics: - Length of the strands: 120 mm Diameter: 28mm
- Winding angle 54.5 °
- FIG. 15 makes it possible to compare the ROS measured as a function of the frequency measured at the input of a strand for an HQI antenna with constant strand width (151) and with variable strand width (152).
- FIGS. 16A and 16B which follow show the radiation diagrams measured in circular polarization respectively at the two frequencies 1.6 GHz and 2.55 GHz, for the propeller of the invention.
- the antenna of the invention makes it possible to obtain:
- the technique of the invention therefore gives a non-negligible increase in bandwidth.
- This gives a printed quadrilateral helical antenna operating in a wide bandwidth and in two different sub-bands with a wide bandwidth, the height of which is reduced.
- the variation in the width of the strands therefore increases the bandwidth of the antenna without reducing the lengths of strands.
- the strands do not all have identical dimensions.
- the antenna is printed flat, then wound on a support to form the antenna.
- the substrate intended to receive the printed elements can be produced directly in its final cylindrical shape. In this case, the printing of the strands and of the supply structure is carried out directly on the cylinder.
- the antenna of the invention also lends itself to the production of antenna arrays.
- this approach can be applied to strands formed from several segments, as illustrated for example in FIG. 3.
- the variation in width can be applied to all the segments, or selectively to some of them. between them.
- Figures 17A and 17B give two illustrative examples of a strand of such an antenna. It is noted that, in these examples, the overall width of the strand 17 is decreasing respectively (FIG. 17A) and increasing (FIG. 17B), each segment 171 being itself of decreasing width (FIG. 17A) and increasing (FIG. 17B).
- the same remarks (geometry, law of variation of the width, ...) applied above to the strands can also apply to each of the segments and / or to the whole of the strand formed of several segments.
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- Details Of Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002527611A JP2004509536A (ja) | 2000-09-15 | 2001-09-14 | 可変ピッチ式へリックス・アンテナとそれに対応する方法 |
US10/363,518 US6836257B2 (en) | 2000-09-15 | 2001-09-14 | Variable-pitch helical antenna, and corresponding method |
AU2001290032A AU2001290032A1 (en) | 2000-09-15 | 2001-09-14 | Variable-pitch helical antenna, and corresponding method |
EP01969903A EP1319229A1 (fr) | 2000-09-15 | 2001-09-14 | Antenne helico dale a pas variable, et procede correspondant |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0011830A FR2814285A1 (fr) | 2000-09-15 | 2000-09-15 | Antenne helicoidale a pas variable, et procede correspondant |
FR00/11830 | 2000-09-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002023673A1 true WO2002023673A1 (fr) | 2002-03-21 |
Family
ID=8854373
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2001/002873 WO2002023673A1 (fr) | 2000-09-15 | 2001-09-14 | Antenne helicoïdale a pas variable, et procede correspondant |
Country Status (6)
Country | Link |
---|---|
US (1) | US6836257B2 (fr) |
EP (1) | EP1319229A1 (fr) |
JP (1) | JP2004509536A (fr) |
AU (1) | AU2001290032A1 (fr) |
FR (1) | FR2814285A1 (fr) |
WO (1) | WO2002023673A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2399948B (en) * | 2003-03-28 | 2006-06-21 | Sarantel Ltd | A dielectrically-loaded antenna |
WO2008008904A1 (fr) * | 2006-07-12 | 2008-01-17 | Mobile Satellite Ventures, Lp | Antenne hélicoïdale quadrifilaire miniaturisée |
US8436783B2 (en) | 2009-03-12 | 2013-05-07 | Sarantel Limited | Dielectrically-loaded antenna |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2844923B1 (fr) | 2002-09-20 | 2006-06-16 | Univ Rennes | Antenne helicoidale a large bande |
JP4512496B2 (ja) * | 2005-01-17 | 2010-07-28 | 株式会社エヌ・ティ・ティ・ドコモ | アンテナ最適設計方法、プログラム及びアンテナ |
JP4587841B2 (ja) * | 2005-02-25 | 2010-11-24 | 株式会社エヌ・ティ・ティ・ドコモ | アンテナ最適設計方法、プログラム及びロッド型アンテナ |
JP4853401B2 (ja) * | 2006-07-11 | 2012-01-11 | 日立電線株式会社 | 円偏波アンテナ |
GB0700276D0 (en) * | 2007-01-08 | 2007-02-14 | Sarantel Ltd | A dielectrically-loaded antenna |
FR2916581B1 (fr) * | 2007-05-21 | 2009-08-28 | Cnes Epic | Antenne de type helice. |
US8089421B2 (en) * | 2008-01-08 | 2012-01-03 | Sarantel Limited | Dielectrically loaded antenna |
WO2016163909A1 (fr) * | 2015-04-09 | 2016-10-13 | Limited Liability Company "Topcon Positioning Systems" | Antenne hélicoïdale à large bande à motif de coupure |
US11211712B1 (en) * | 2018-11-13 | 2021-12-28 | Topcon Positioning Systems, Inc. | Compact integrated GNSS-UHF antenna system |
US11258181B2 (en) | 2019-12-20 | 2022-02-22 | Eagle Technology, Llc | Systems and methods for providing a high gain space deployable helix antenna |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0649181A1 (fr) * | 1993-10-14 | 1995-04-19 | Alcatel Mobile Communication France | Antenne du type pour dispositif radio portable, procédé de fabrication d'une telle antenne et dispositif radio portable comportant une telle antenne |
FR2746547A1 (fr) * | 1996-03-19 | 1997-09-26 | France Telecom | Antenne helice a alimentation large bande integree, et procedes de fabrication correspondants |
EP0920073A1 (fr) * | 1997-11-27 | 1999-06-02 | Nokia Mobile Phones Ltd. | Antenne hélicoidale multifilaire |
WO1999060665A1 (fr) * | 1998-05-18 | 1999-11-25 | Allgon Ab | Dispositif a antenne comportant des elements rayonnants couples de maniere capacitive et dispositif de communication radio a main pour ledit dispositif |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2746548B1 (fr) * | 1996-03-19 | 1998-06-19 | France Telecom | Antenne helicoidale a moyens de duplexage integres, et procedes de fabrication correspondants |
SE516105C2 (sv) * | 1999-06-11 | 2001-11-19 | Allgon Ab | En metod för att styra strålningsmönstret hos en antenn, ett antennsystem och en radiokommunikationsanordning |
US6407720B1 (en) * | 1999-07-19 | 2002-06-18 | The United States Of America As Represented By The Secretary Of The Navy | Capacitively loaded quadrifilar helix antenna |
US6429830B2 (en) * | 2000-05-18 | 2002-08-06 | Mitsumi Electric Co., Ltd. | Helical antenna, antenna unit, composite antenna |
-
2000
- 2000-09-15 FR FR0011830A patent/FR2814285A1/fr active Pending
-
2001
- 2001-09-14 WO PCT/FR2001/002873 patent/WO2002023673A1/fr not_active Application Discontinuation
- 2001-09-14 AU AU2001290032A patent/AU2001290032A1/en not_active Abandoned
- 2001-09-14 EP EP01969903A patent/EP1319229A1/fr not_active Withdrawn
- 2001-09-14 US US10/363,518 patent/US6836257B2/en not_active Expired - Fee Related
- 2001-09-14 JP JP2002527611A patent/JP2004509536A/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0649181A1 (fr) * | 1993-10-14 | 1995-04-19 | Alcatel Mobile Communication France | Antenne du type pour dispositif radio portable, procédé de fabrication d'une telle antenne et dispositif radio portable comportant une telle antenne |
FR2746547A1 (fr) * | 1996-03-19 | 1997-09-26 | France Telecom | Antenne helice a alimentation large bande integree, et procedes de fabrication correspondants |
EP0920073A1 (fr) * | 1997-11-27 | 1999-06-02 | Nokia Mobile Phones Ltd. | Antenne hélicoidale multifilaire |
WO1999060665A1 (fr) * | 1998-05-18 | 1999-11-25 | Allgon Ab | Dispositif a antenne comportant des elements rayonnants couples de maniere capacitive et dispositif de communication radio a main pour ledit dispositif |
Non-Patent Citations (2)
Title |
---|
LOUVIGNE J C; SHARAIHA A: "Synthesis of printed quadrifilar helical antenna", ELECTRONICS LETTERS, vol. 37, no. 5, 1 March 2001 (2001-03-01) - 1 March 2001 (2001-03-01), UK, pages 271 - 272, XP002166075 * |
See also references of EP1319229A1 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2399948B (en) * | 2003-03-28 | 2006-06-21 | Sarantel Ltd | A dielectrically-loaded antenna |
WO2008008904A1 (fr) * | 2006-07-12 | 2008-01-17 | Mobile Satellite Ventures, Lp | Antenne hélicoïdale quadrifilaire miniaturisée |
US8022890B2 (en) | 2006-07-12 | 2011-09-20 | Mobile Satellite Ventures, Lp | Miniaturized quadrifilar helix antenna |
US8436783B2 (en) | 2009-03-12 | 2013-05-07 | Sarantel Limited | Dielectrically-loaded antenna |
Also Published As
Publication number | Publication date |
---|---|
EP1319229A1 (fr) | 2003-06-18 |
US20030184496A1 (en) | 2003-10-02 |
AU2001290032A1 (en) | 2002-03-26 |
JP2004509536A (ja) | 2004-03-25 |
US6836257B2 (en) | 2004-12-28 |
FR2814285A1 (fr) | 2002-03-22 |
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