EP2449623A1 - Modular band extension device for a very-wide-band omnidirectional antenna - Google Patents
Modular band extension device for a very-wide-band omnidirectional antennaInfo
- Publication number
- EP2449623A1 EP2449623A1 EP10723615A EP10723615A EP2449623A1 EP 2449623 A1 EP2449623 A1 EP 2449623A1 EP 10723615 A EP10723615 A EP 10723615A EP 10723615 A EP10723615 A EP 10723615A EP 2449623 A1 EP2449623 A1 EP 2449623A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- metal
- band
- plate
- metal links
- 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
- 239000002184 metal Substances 0.000 claims abstract description 55
- 230000005284 excitation Effects 0.000 claims description 14
- 230000005684 electric field Effects 0.000 claims description 10
- 230000006978 adaptation Effects 0.000 claims description 9
- 239000011159 matrix material Substances 0.000 claims description 5
- 230000010287 polarization Effects 0.000 claims description 5
- 230000001902 propagating effect Effects 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 3
- 230000005855 radiation Effects 0.000 description 10
- 230000007704 transition Effects 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 230000000750 progressive effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/002—Protection against seismic waves, thermal radiation or other disturbances, e.g. nuclear explosion; Arrangements for improving the power handling capability of an antenna
Definitions
- the object of the invention relates to a device with adjustable positions depending on the carrier vehicle to expand the band of use of a very broadband omnidirectional antenna, for example to expand the band 100 MHz-3GHz to the band 30 MHz-3GHz.
- adjustable positions refers to elements of the device whose position and / or disposition may change depending on the antenna used and the carrier on which it is located.
- the invention lies in the field of antennas or antenna systems dedicated to electromagnetic wave emission / reception applications in a very wide band.
- the concept implemented in the invention can be integrated on all types of carrier (ground, naval or airborne). It is particularly suitable for integration on the roof of a mobile carrier (civilian and military vehicles). It can be exploited in other frequency bands than the one mentioned above.
- antennal structures such as monopole antennas, saber antennas, dipole antennas, biconical antennas or discone, or antennas loaded with a resistor or a tuning box.
- the antenna structure according to the invention makes it possible to solve one or more of the aforementioned problems.
- the invention relates to a modular device for widening the band of use of a very broadband omnidirectional antenna, said antenna being arranged on a carrier vehicle V, characterized in that it comprises at least the following elements:
- a first upper conductive plate provided with one or more locations making it possible to maintain metal links, said metal links being loaded with an adaptation circuit, consisting of the power resistor,
- a second lower conductive plate also provided with one or more locations for making the electrical contacts between the power resistors and said plate by metal links,
- Said antenna (1) comprises a broadband exciter (7) having an external surface and a surface profile adapted to generate or capture a linear vertical polarization electric field created between the two plates (5, 6), said electric field propagating within a guide structure formed by the first plate (5), the second plate (6) and the means for broadband excitation (7), said broadband exciter being of "pseudo-conical" shape and consisting of conductive facets, metal fabric or metal rods.
- the lower conductive plate of the antenna may be an independent plate attached to the carrier vehicle.
- Said locations provided on the plates are holes or orifices allowing adjustment or easy movement of the metal links of the matching circuit consisting of power resistors.
- the hole matrices or locations are extended around the metal planes and to near the junction of the upper metal plane and the upper part of the broadband exciter.
- the said metal links are inclined or perpendicular to the planes.
- the number and arrangement of the metal links provided with the matching circuit consisting of power resistors are defined taking into account the carrier on which the antenna is arranged.
- the value of the power resistors vary and are adapted according to their number and the carrier on which the antenna is arranged.
- the characteristics of the power resistors are chosen to allow the antenna to be used for high power applications also in the extended frequency band.
- the frequency operating band is between 30 MHz and 3 GHz.
- the matching circuit consists of, for example, one or more elements selected from the following list: resistance, capacitance and / or power choke.
- FIG. 1A a side view of an example of antenna structure on which the invention is applied
- FIG. 1B a view from above of FIG. 1A, FIG. 1C, a bottom view of FIG. 1A, FIG. 1D a detail of the antenna illustrated in FIG. 1A,
- FIGS. 2A and 2B seen in profile and seen from above, an example of integration of an antenna on a 4x4 carrier vehicle
- FIGS. 3A and 3B two examples of potential vehicle-type carrier integration of the antenna on which the invention is applied.
- FIG. 4 the standing wave ratio obtained with an antenna described in FIGS. 1A to 1D in the presence or absence of the device according to the invention and in the presence or absence of a carrier vehicle of small dimension as specified in FIG. figure 2,
- FIG. 5 the gain realized on the horizon in vertical polarization with an antenna described in FIGS. 1A to 1D in the presence of the device according to the invention and in the presence or absence of a carrier vehicle of small dimension as specified in Figure 2.
- the following description is a use of the antenna for transmission electromagnetic waves on the horizon and below the horizon, that is to say, downwards and over 360 ° azimuth for a frequency band between 30 MHz and 3 GHz.
- FIG. 1A represents a side view of an example of an antenna structure arranged by means of the modular device according to the invention on a carrier vehicle V (FIG. 2A).
- the antenna 1 used in the present description for illustrative purposes is detailed in the applicant's patent application FR 08 07230.
- An antenna 1 intended to be mounted on the support consists, for example, of a lower conductive plate 6 designed with a conductive material such as a metal material having for example a length L1 of 2000mm and a width 11 of 1700 mm.
- This plate may be a planar or substantially planar metallic part independent or any of a carrier V ( Figure 2A).
- a second conductive plate which in this example corresponds to the upper plate 5 and has a length L2 in this example of 2000 mm and a width 12 of 1700 mm forms the upper plane of the antenna system according to the invention.
- the plate 6 forming the lower plane and the plate 5 forming the upper plane may have an identical surface.
- the two plates can be made of the same metallic material adapted to microwave frequencies.
- the lower plate 6 and the upper plate 5 are spaced apart by a distance or gap E.
- the value of the spacing E between the two plates is chosen according to the minimum frequency of use.
- the spacing E may be less than the wavelength, corresponding to the minimum operating frequency, divided by 8.
- the larger the dimensions of the plates the smaller the spacing of the plates may be.
- the antenna 1 is constituted by a broadband exciter 7 positioned between the metal planes 5 and 6 in which a matrix of holes 8 (FIGS. 1B and 1C) is made in order to receive several metal links 2 loaded by power resistors. 3.
- the function of the metallic links is to enable electrical conduction between the different elements.
- the power resistors 3 are preferably situated on the lower plate 6. These power resistors 3 are, on the one hand, connected to the metal links 2 connected to the upper plane 5 and, on the other hand, to the connected metal links 4 6. In fact, the metal planes 5 and 6 are connected to each other via the elements 2, 3 and 4.
- the number of metal links can vary depending on the need. These links, according to their number, their placement and the value of the power resistance 3, allow optimization of the adaptation of the low frequency structure by absorbing undesirable currents. They also make it easier to excite the carrier vehicle that participates in the radiation in the frequency band 30MHz-100MHz.
- the position of the metal links 2,4 as well as the power resistors 3 it is also possible to modify the radiation of the antenna, for example, to improve the radiation of the antenna in the presence of the carrier or to avoid radiation in one direction in the frequency bands of a few percent.
- the power resistors may have different values or not.
- Figures 1 B and 1 C respectively show a top view and a bottom view of an embodiment of the antenna.
- a matrix of holes 8 is formed in order to easily adjust the location of the elements 2, 3 and 4 and allow the latter to play their role of conductor between the planes 5 and 6.
- the metal links 2, 4 resistively charged by the power resistors 3 can be moved to all the positions 8 or holes Ti of the matrix.
- the dies will preferably be extended around the planes 5 and 6 and to the vicinity of the junction of the metal plane 5 and the upper part 9 of the broadband exciter 7 present between the two planes 5, 6.
- the metal links can be inclined or perpendicular to the planes 5, 6. These links can be straight, bent or meandering.
- the metal plane 6 is directly made by a part of the carrier, for example when it corresponds to the roof of the vehicle (gallery or other), then the matrix of the missing plane 6 may not be realized and the elements 3, 4 directly attached to the carrier by means known to those skilled in the art or means that allow the conduction to be done.
- the conduction metal bonds can be made of any type of material having properties conductors from the moment when this material is adapted to operate in the microwave.
- the spacing between plates, the number and the arrangement of the metal links are, for example, determined according to the widening of the band of use to be obtained by using electromagnetic simulation tools.
- the omnidirectional antenna 1 provided with metal links loaded with power resistors 3, for example, is adapted to a characteristic impedance of 50 Ohms.
- the fact of using power resistors 3 allows this antenna 1 modified according to the invention to be used for high power applications on the band 30-3000 MHz.
- This antenna also has radio coverage mainly directed to the horizon and to the ground over the entire frequency band.
- the dielectric spacers 10 and 1 1 have the particular function of ensuring a mechanical rigidity of the system.
- a more complex matching or charging circuit composed of one or more elements chosen from the following list: resistance, inductance, capacitance, the elements mentioned being used alone or in combination, knowing that the final function will be to ensure the impedance matching and the radiation of the antennal system on any carrier.
- the broadband exciter 7 has the particular function of establishing an electric field E guided between the two planes 5, 6 and its outer wall S ⁇
- the exciter can consist of several conductive facets
- Metallic, for example 2Oi whose profile of their outer wall has been optimized to operate on the bandwidth of the antenna.
- the assembly of the different facets 20i (for example, with symmetry of revolution), as well as their profile are chosen to ensure a progressive and omnidirectional transition of the electric field between an excitation point 21 disposed at the level of the lower plane 6 and the plane
- the excitation point 21 is, for example, a conductive cylinder formed for example in a machined metal material, providing the mechanical and electrical interface between the core of the connector 22 and the broadband exciter.
- Facets 2Oi can be metal plates, metal fabric or formed of metal rods.
- the facets 20i are, for example, connected to each other and to the upper plane 5 by means of metal screws (or conductive). Any other fastener allowing electrical continuity between the two parts may be considered. It is also possible to use a mechanically welded technique.
- the various metal parts are, for example, screwed or nested with each other so as to ensure good mechanical strength and electrical continuity from the core of the connector 22 to the exciter junction - upper plate. Any other technique allowing an assembly ensuring on the one hand a mechanical strength and on the other hand an electrical continuity can be used.
- the combination of elements 20 and 23 form the broadband exciter.
- the assembly has an external surface S ⁇ and a surface profile P s adapted to generate a linear vertical polarization electric field created between the two plates 5, 6, under the effect of a signal applied at an excitation point. 21 of the antenna, said electric field propagating within a guide structure formed by the upper plate, the lower plate and the excitation means.
- the metal cone 23 makes it possible to ensure the mechanical and electrical interface between the facets 20i and the excitation point 21.
- the exciter can take different forms and consist of one or more parts as long as this gradual transition is ensured between the two planes or the two plates.
- the progressive transition is defined in the context of the invention as a transition or mechanical profile progressive symmetry of revolution between the excitation point 21 and the upper plate 5 for very broadband impedance matching.
- the broadband excitation means generates, for example, a vertically polarized electric field.
- the broadband excitation means is, for example, adapted to create an electric field propagating between the two plates said antenna generating an omnidirectional radio radiation in azimuth oriented towards the ground and the horizon.
- facets to form the outer wall of the exciter offers advantages such as facilitating the assembly and manufacture of the system.
- the excitation of facets 2Oi is ensured by a conical metal cylinder 23 at the top of which is placed the excitation point 21 and at the base of which are fixed the metal facets 20i.
- This part 23 of the system is not necessarily conical, but may be cylindrical, hemispherical, exponential or logarithmic, according to shapes and profiles known to those skilled in the art.
- the dimensions above are given for illustrative purposes. Indeed, the dimensions of the upper plane may be greater, smaller or equal to the dimensions of the lower plane according to the desired orientation of the radiation, to the ground, the horizon or the sky.
- the shape of the plates can be rectangular, circular, square, ovoid or polygonal complex depending on the surface acceptable by the wearer and the specification relating to the omnidirectionality of the radiation patterns.
- FIGS. 2A and 2B show a proposal for integrating the antenna 1 provided with the elements 2, 3, 4 according to the invention onto a vehicle V of the 4x4 type.
- the elements 2, 3, 4 are placed so as to compensate for example the dissymmetry of the vehicle which influences the omnidirectionality.
- FIGS. 3A and 3B show a proposal for integrating the antenna 1 provided with resistively charged metal links on a vehicle 1 1 of the Avant Armored Vehicle type.
- the elements 2, 3, 4 are placed so as to compensate, for example, the dissymmetry of the vehicle and the positioning of the antenna which influences the omnidirectionality.
- FIG. 4 represents the standing wave ratio obtained for a configuration of the antenna 1, with and without the resisitively charged metal links and with and without a carrier vehicle.
- the invention allows a significant improvement of the low frequency adaptation without degrading the adaptation to the rest of the band.
- the invention also allows the carrier vehicle to contribute to the adaptation of the antenna 1.
- the curve I corresponds to the ROS as a function of the frequency for an antenna alone (without a vehicle and without a metal link resistively charged)
- the curve II corresponds to an antenna without a vehicle and with resistively loaded metal links
- the curve III corresponds to an antenna mounted on a vehicle and with resistively charged links.
- FIG. 5 represents, in dB, the gain achieved on the horizon in vertical polarization over the frequency band 30-3000 MHz.
- the use of the invention in the presence of a carrier vehicle V allows a significant increase of the gain in low frequency and a stabilization of the latter on the intermediate frequencies by a judicious choice of the positioning of the elements 2, 3, 4.
- the gain in high frequency is not degraded by the presence of these elements.
- Curve IV represents the curve obtained without a vehicle with resistively charged metal links, curve V, a vehicle-mounted antenna and resistively charged metal links.
- the antenna according to the invention has notably the following advantages:
- the low frequency band extension (30-100 MHz) is obtained thanks to the metal links loaded by power resistors.
- the links between the two plates of the reference antenna to excite the carrier vehicle may radiate at low frequencies.
- the modularity of the metal links allows an arrangement adapted to each carrier vehicle by reducing the omnidirectionality defects specific to each vehicle.
Landscapes
- Details Of Aerials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0903188A FR2947389B1 (en) | 2009-06-30 | 2009-06-30 | MODULAR BAND EXTENSION DEVICE FOR WIDE BAND OMNIDIRECTIONAL ANTENNA |
PCT/EP2010/058492 WO2011000702A1 (en) | 2009-06-30 | 2010-06-16 | Modular band extension device for a very-wide-band omnidirectional antenna |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2449623A1 true EP2449623A1 (en) | 2012-05-09 |
EP2449623B1 EP2449623B1 (en) | 2013-07-24 |
Family
ID=41818957
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10723615.0A Active EP2449623B1 (en) | 2009-06-30 | 2010-06-16 | Modular band extension device for a very-wide-band omnidirectional antenna |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2449623B1 (en) |
FR (1) | FR2947389B1 (en) |
WO (1) | WO2011000702A1 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3587004A (en) * | 1969-09-23 | 1971-06-22 | Sylvania Electric Prod | Contradirectional couplers |
EP0978899A1 (en) * | 1998-08-06 | 2000-02-09 | Radiacion y Microondas, S.A. | Dish-type isoflux antenna |
-
2009
- 2009-06-30 FR FR0903188A patent/FR2947389B1/en active Active
-
2010
- 2010-06-16 EP EP10723615.0A patent/EP2449623B1/en active Active
- 2010-06-16 WO PCT/EP2010/058492 patent/WO2011000702A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011000702A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2947389A1 (en) | 2010-12-31 |
FR2947389B1 (en) | 2011-06-17 |
WO2011000702A1 (en) | 2011-01-06 |
EP2449623B1 (en) | 2013-07-24 |
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