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WO2007036001A1 - Agencement amélioré d'antennes - Google Patents

Agencement amélioré d'antennes Download PDF

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Publication number
WO2007036001A1
WO2007036001A1 PCT/AU2006/001430 AU2006001430W WO2007036001A1 WO 2007036001 A1 WO2007036001 A1 WO 2007036001A1 AU 2006001430 W AU2006001430 W AU 2006001430W WO 2007036001 A1 WO2007036001 A1 WO 2007036001A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna elements
antenna
sub
transmission line
receiving
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.)
Ceased
Application number
PCT/AU2006/001430
Other languages
English (en)
Inventor
Nicholas Richard Hart
John Stanley Craggs
Glen Alexander
Barry Seynour Griggs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hills Ltd
THISS TECHNOLOGIES Pte Ltd
Original Assignee
Hills Industries Ltd
Hills Ltd
THISS TECHNOLOGIES Pte Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from AU2005905397A external-priority patent/AU2005905397A0/en
Application filed by Hills Industries Ltd, Hills Ltd, THISS TECHNOLOGIES Pte Ltd filed Critical Hills Industries Ltd
Publication of WO2007036001A1 publication Critical patent/WO2007036001A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/061—Two dimensional planar arrays
    • H01Q21/067—Two dimensional planar arrays using endfire radiating aerial units transverse to the plane of the array
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/20—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path

Definitions

  • This invention relates to antenna arrays, and particularly to arrays containing multiple radiating elements in the form of helical antenna elements.
  • Antenna systems such as those for use in ' satellite communications are often required to operate on structures for which space is a premium. Examples of such applications are a satellite antenna on a warship, or on a mobile terrestrial vehicle.
  • a helical antenna array which consists of a plurality of individual antenna elements through which the antenna radiation pattern can be controlled by controlling the feeding signals to individual antenna elements as will be understood by the person skilled in the art.
  • a base is provided to support the plurality of antenna elements, and each is fed by way of a network of radio frequency transmission elements such as printed transmission lines to guide the signals to each antenna element from a main feed input or to an output.
  • Figure IA shows a typical helical antenna array 10 having a base 20 supporting a plurality of helical antenna elements 30.
  • the base 20 may comprise an assembly of metal ground plane, dielectric substrate material and printed transmission lines.
  • Figure IB is a view from below of the antenna 10 of Figure IA, showing a typical feed network 50 to feed signals from a signal splitter 40 having an input for receiving a drive signal and multiple outputs for feeding the required signal to the appropriate antenna element(s).
  • the feed network 50 is typically formed by printing transmission lines onto the base 20 as will be understood by the person skilled in the art.
  • an antenna array comprising: a plurality of sub-arrays each comprising a plurality of transmitting antenna elements and a plurality of receiving antenna elements, said plurality of sub- arrays being arranged on a base; wherein each said sub-array further comprises at least one printed transmission line interconnecting the plurality of transmitting antenna elements and at least one printed transmission line interconnecting the plurality of receiving antenna elements; and wherein the transmitting antenna elements of the plurality of sub-arrays are interspersed with the receiving antenna elements of the plurality of sub-arrays; and wherein for each sub-array the antenna array further comprises: a cable for connecting the interconnected transmitting antenna elements to an antenna input; and a cable for connecting the interconnected receiving antenna elements to an antenna output.
  • a base module for an antenna array comprising: a plurality of sub-arrays each comprising a plurality of transmitting antenna elements and a plurality of receiving antenna elements, said plurality of sub-arrays being arranged on a base; wherein each said sub-array further comprises at least one printed transmission line interconnecting the plurality of transmitting antenna elements and at least one printed transmission line interconnecting the plurality of receiving antenna elements; and wherein the transmitting antenna elements of the plurality of sub-arrays are interspersed with the receiving antenna elements of the plurality of sub-arrays; and wherein for each sub-array the antenna array further comprises: a cable for connecting the interconnected transmitting antenna elements to an antenna input; and a cable for connecting the interconnected receiving antenna elements to an antenna output; wherein the base upon which the sub-arrays are arranged comprises a plurality of said base modules, upon each of which is arranged a said sub-array.
  • an antenna array comprising a plurality of transmitting antenna elements for transmitting radio frequency signals and a plurality of receiving antenna elements for receiving radio frequency signals, wherein the transmitting antenna elements and the receiving antenna elements are interspersed with each other.
  • the plurality of transmitting antenna elements and the plurality of receiving antenna elements are arranged in sub-arrays.
  • each sub-array has at least one transmitting antenna element and at least one receiving antenna element.
  • each sub-array has a plurality of transmitting antenna elements and a plurality of receiving antenna elements.
  • the plurality of transmitting antenna elements in one of the sub-arrays are connected to each other via a printed transmission line and the printed transmission line is connected to a signal input via a first cable and the plurality of receiving antenna elements in the sub-array are connected to each other via a second printed transmission line and the second printed transmission line is connected to a signal output via a second cable.
  • an antenna array comprising a plurality of antenna elements for transmitting radio frequency signals and/ or receiving radio frequency signals, the plurality of antenna elements being distributed on a base, wherein the base is made from a plurality of base modules connected together to form the base.
  • each of the plurality of base modules has some of the plurality of antenna elements.
  • the some of the plurality of antenna elements disposed on a single base module are interconnected by way of a printed transmission lines.
  • the plurality of base modules are connected to a signal input or output by way of cables.
  • the plurality of antenna elements include a plurality of transmitting antenna elements for transmitting radio frequency signals, and a plurality of receiving antenna elements for receiving radio frequency signals.
  • each of the plurality of base modules has some of the plurality of transmitting antenna elements and some of the plurality of receiving antenna elements.
  • the some of the plurality of transmitting antenna elements disposed on a single base module are interconnected by a first printed transmission line and the some of the plurality of receiving antenna elements are interconnected by a second printed transmission line.
  • the plurality of base modules are connected to a signal input or output by way of cables.
  • the first printed transmission line on the single base module is connected to a signal input by a first cable and the second printed transmission line is connected to a signal output by a second cable.
  • the base forms a common ground plane for the plurality of antenna elements.
  • a module for a base for an antenna array comprising: a port for receiving at least one antenna element for radiating or receiving radio frequency signals; a printed transmission line for conducting signals to or from the at least one antenna element; and a connector for connecting the printed transmission line to a cable for electrical connection to an input or an output of the signals.
  • the module further comprises a second port for receiving a second antenna element.
  • the at least one antenna element is a transmitting antenna element and the second antenna element is a receiving antenna element.
  • the transmission line is for connection to the transmitting antenna element and the module further comprises a second printed transmission line for connection to the receiving antenna element.
  • the connector is for connecting the transmission line to the signal input and the module further comprises a second connector for connecting the second transmission line to the signal output.
  • an antenna array comprising a plurality of antenna elements for transmitting and/ or receiving radio frequency signals, wherein the plurality of antenna elements are arranged in sub-arrays.
  • the antenna elements arranged in a single array are connected to each other by a printed transmission line.
  • the printed transmission line is connected to a signal input or a signal output by a cable.
  • each sub-array has at least one transmitting antenna element and at least one receiving antenna element.
  • each sub-array has a plurality of transmitting antenna elements and a plurality of receiving antenna elements.
  • the at least one transmitting antenna element is connected to a signal input via a first cable and the receiving antenna element is connected to a signal output via a second cable.
  • the plurality of transmitting antenna elements in one of the sub-arrays are connected to each other via a printed transmission line and the printed transmission line is connected to a signal input via a first cable and the plurality of transmitting antenna elements in the sub-array are connected to each other via a second printed transmission line and the second printed transmission line is connected to a signal output via a second cable.
  • Other aspects of the invention are also disclosed.
  • Figure IA shows a prior art arrangement for a helical array antenna
  • Figure IB shows the underside of the helical array antenna of Figure IA
  • Figure 2 is a perspective view of a helical array antenna according to an aspect of the present invention
  • Figure 3 is a plan view of the antenna of Figure 2;
  • Figure 4 shows a conceptual representation of the array modularisation aspect of the present invention
  • Figure 5 is a view from underneath of the antenna of Figure 3;
  • Figure 6 shows a modelled beam pattern of the antenna of the present invention
  • Figure 7 shows the helix antenna disclosed in International Patent Application NO. PCT / AU03/00690;
  • Figure 8 shows side and plan views of the antenna in Figure 7; and APPENDIX A contains an extract of relevant material from International Patent Application No. PCT / AU03/00690 (W003/107483).
  • the C band satellite 15 spectrum comprises two separate frequency assignments, particularly, a transmit frequency band between 5.85 and 6.425 GHz and a receive frequency band between 3.625 and 4.2 GHz.
  • the helical antenna elements are not sufficiently broad band to cover both transmit and receive frequency bands, so two distinct sets of helices are required.
  • the two sets of helical antenna arrays are disposed side by side, one array for transmitting and one array for receiving. This physical separation has traditionally been necessary in duplex systems.
  • the power of the signal from the transmitting part of the array far outweighs the power of the signal received at the receiver, by many tens of dBs.
  • the transmit and receive helical antenna elements are integrated so as to further reduce the area required to contain a full duplex satellite antenna.
  • FIG. 2 shows an integrated antenna arrangement according to the present disclosure.
  • the integrated helical antenna array 100 consists of a plurality of helical antenna elements 300 arranged and supported on a base 200.
  • Other types of antenna elements may be used, however in all cases, the transmitting antenna elements and the receiving antenna elements should have opposite polarization to improve the inter- element isolation, unless the system using the antenna array operates in half-duplex mode.
  • transmitting antenna elements are interspersed with receiving antenna elements, eliminating the need for two separate areas or regions to provide a full duplex operation.
  • Antenna elements 300 may be provided by any suitable helical antenna as known to the person skilled in the art, including that disclosed in International Patent Application No. PCT / AU03/00690 (W003/107483), the contents of 10 which are hereby incorporated by reference (see APPENDIX A).
  • the shorter elements are the transmitting elements and the longer elements are the receiving elements. This difference has no bearing on the present disclosed arrangement, and is illustrated accordingly to clearly show the interspersed or interleaved nature of the transmitting and receiving antenna elements. In practice, all the antenna elements could be the same length or in fact, the receiving elements could be shorter than the transmitting elements.
  • the base 200 is constructed from a number of base modules 210, 220, 230, 240 (as can be seen in Figure 2) and also base modules 250,260,270 and 280 (as further seen in Figure 3, being a plan view of the disclosed arrangement of Figure 2).
  • base modules each support a mix of transmitting antenna elements and receiving antenna elements.
  • base module 210 supports four transmitting antenna elements 320 and four receiving antenna elements 310.
  • Base 200 is also made up of further base modules 250, 260, 270 and central base module 280, each supporting a respective set of transmitting and receiving antenna elements.
  • a base 200 may be any suitable shape and may be made up of any number of a plurality of base modules (i.e. two or more). Furthermore, this modular disclosed arrangement need not be limited to use in an integrated antenna array according to the first disclosed arrangement, but may equally be applicable to an antenna array solely used for transmitting and an antenna array solely used for receiving.
  • the number of antenna elements per base module may be varied depending upon the requirements of the particular array and indeed, a base module making up a base need not support the same number of antenna elements as another base module making up that base.
  • antenna arrays can be custom-made using pre-designed and manufactured antenna modules.
  • module 280 may be used by itself to provide an array with 12 antenna elements.
  • module 280 may be combined with modules 250,260 and 270 to provide a different antenna configuration.
  • base 200 may be provided without the internal module 280 to provide yet another antenna design.
  • the design of the antenna array allows the use of a combination of printed transmission lines and cables for use in connecting the antenna elements to the feed components.
  • printed transmission line is taken to include microstrip and/or strip-line implementations.
  • the differences in signal paths in the transmission lines also produces variations in the phase of the signal applied to different antenna elements at different locations about the array, which further reduces the ability to predictably control the beam pattern.
  • this disclosed arrangement provides for a combination of cable connection from signal input or to signal output ports, to sub arrays of antenna elements, which then connect the cable output or input to the individual antenna elements by way of printed transmission lines.
  • This disclosed arrangement is shown conceptually in Figure 4, where there is shown three sub-arrays 300', 300" and 300'", each having a series of transmitting antenna elements 320 and receiving antenna elements 310.
  • transmitting antenna elements 320 are connected together via printed transmission line 225 and receiving antenna elements 310 are connected 10 together via printed transmission line 221.
  • the spacing between the printed transmission line 225 interconnecting the transmitting antenna elements 320, and the printed transmission line 221 interconnecting the receiving antenna elements 310 is made sufficient to provide the desired amount of isolation between the transmitting antenna elements 320 and the receiving antenna elements 310.
  • Printed transmission line 225 is connected to antenna input 400 by cable 600 and printed transmission line 221 is connected to antenna output 500 by cable 610.
  • Sub-arrays 300" and 300'" are similarly connected.
  • the use of cables according to this disclosed arrangement provides the following advantages: a) The use of connecting cables provides a mechanism for providing a high level of radio frequency signal isolation between the high powered transmit and very low level receive signals. This is essential to support full duplex communication which is a system requirement for most broadband communication networks; b) The use of connecting cables provides identical signal power connection from the input of the antenna to the sub-array modules, so ensuring that the antenna array performance is optimized in terms of maximizing the antenna directivity and minimizing the antenna side lobes; c) The use of printed transmission line which are typically used to provide the interconnections between array elements and the antenna feed connection, would lead to signal attenuation which is proportional to the length of the transmission line, such that remote antenna sub-arrays would not have identical signal amplitude as to the closest elements - the use of cables to bring the identical signal to a smaller array of elements reduces this problem; d) By having integrated sub-arrays with small number of antenna elements connected by classical transmission line techniques, enables the number of interconnecting
  • the receiving antenna element 310 is a member of a ring of receiving antenna elements
  • the transmitting antenna element 320 is a member of a ring of transmitting antenna elements that lies inside of, and is concentric with, the ring of which the receiving antenna element 310 is a member.
  • the receiving antenna element 330 is a member of a ring of receiving antenna elements that lies inside of, and is concentric with, the ring of which the transmitting antenna element 320 is a member.
  • the transmitting antenna element 340 is a member of a ring of transmitting antenna elements that lies inside of, and is concentric with, the ring of which the receiving antenna element 330 is a member.
  • Figure 3 illustrates an example in which the antenna array 100 is circular
  • the approach of having integrated sub-arrays with small number of antenna elements connected by classical transmission line techniques enables antenna arrays having other shapes such as elliptical, or even square or rectangular, in which the transmitting and receiving antenna elements are arranged along respective alternating concentric curves of appropriate shape.
  • FIG. 5 is a view from below of base 200 of Figure 3 and shows a specific embodiment of the concept illustrated in Figure 4. There can be seen the disclosed arrangement of printed transmission lines on the reverse, or under side of base 200. Looking at base module 220 for example, the printed transmission line 225 provides a transmission path for signals to be fed to each of the transmitting antenna elements 320 through respective inputs 226.
  • Connection point 227 provides an input connection for a cable (not shown) which would be attached at one end at point 222 and at the other end to a signal splitter (not shown) itself providing a general signal input to die array.
  • the signal splitter will split the general input signal to other cables for feedt ⁇ g to other base 5 modules.
  • Printed transmission line 221 on base module 220 provides the transmission path for the receiving antenna elements 310, via connection point 222 to cable connection point 223 to transmit the signals received by the antenna elements to a signal combiner (not shown) via cable (not shown) to provide the general output of the antenna array.
  • 10 Holes 224 provide a means to mechanicaUy retain the antenna elements to base
  • Figure 6 is the Copolar performance of the transmitting part of the antenna array design.
  • this disclosed arrangement may be equally applied to an antenna array providing only a transmitting function or only a receiving function, and need not be 20 . limited to use with an integrated array, In this embodiment, the disclosed arrangement would appear as in Figure 4 with sub-arrays 300', 300" and- 300'" having only the transmitting antenna elements 320, printed transmission line 225, cable 600 and antenna input 400 for a transmitting antenna array or in the case of a receiving array, only receiving antenna elements 310, printed transmission line 221 and cable 610 connecting the line to antenna output 500.
  • FIG. 7 shows the disclosed helix antenna.
  • the antenna comprises a conductive ground plane 706 above which is disposed a helical coil 704 (alternately referred to in this description as a "helix", a “helical coil” or the like) that is electrically terminated at the upper end of the helix 704 with a spiral 702.
  • the helix antenna is depicted as having a vertical axis 700.
  • the helical coil 704 comprises between 1.5 and 3.5 turns. However, other numbers of turns can be used. Furthermore, the helix 704 is approximately one wavelength plus minus 10% of a wavelength in circumference. In addition, the spiral 702 comprises between 2 and 4 turns, in a flat configuration normal to the axis 700.
  • ground plane 706 is depicted as having a circular shape in Figure 7, in fact the extent of the ground plane 706 is not critical, provided that it has an area greater than two thirds of a wavelength in diameter.
  • Figure 8 shows a side view 824 of the helix 704 and the spiral 702, and also a plan view 832 thereof.
  • the helix 704 has a first end 814 that is disposed a distance 816 above the ground plane 706.
  • This first end 814 of the helix 704 has a radial position about the axis 700 as depicted by a reference numeral 814' in the plan view 832.
  • the helix 704 when wound in a clock-wise direction produces right hand circular polarization, and when wound in a counter-clockwise direction, produces left hand circular polarization.
  • the number of turns of the helix can typically vary between 1.5 and 3.5, however the number of turns can be varied outside these limits.
  • the helix 704 in Figure 8 depicts one example of a helix being wound in a counter-clockwise direction commencing from the first end 814 and comprises three and a quarter turns.
  • the three and a quarter turns comprise a first turn 812-810, a second turn 808-806, a third turn 804-802, and a final quarter turn 800.
  • the final quarter turn 800 of the helix 704 runs from a radial position depicted by the arrow 814' to a radial position depicted by the arrow 838 which is the upper end of the helix 704.
  • the upper end of the helix is connected to the outer end of the spiral 702 at a radial position 838.
  • the first quarter turn of the helix 704 which extends from the first end 814 to a point 846, describes an angle 844 with respect to a dashed line 822.
  • the remainder of the helix 704 is uniformly wound with a pitch angle 820, which can vary between 3 and 7 degrees, referred to the horizontal reference line 822.
  • the angle 1 844 can be adjusted to achieve a desired impedance at the input of the helix 704. Although the angle is depicted as being greater than the pitch angle 820, this is illustrative only, and other angles can be adopted according to the desired impedance.
  • an abrupt change between the angles 844 and 820 occurs at the point 846 in Figure 8, in practice a smooth angular transition can be used.
  • the angle 844 together with the distance 816 of the helix first end 814 from the ground plane 706 establishes a distance 828 which is located a quarter turn from the helix first end 814.
  • the radial location of the distance 828 is depicted by the reference numeral 838 in the plane view 832.
  • the one quarter turn segment of the helix 704 between 814 and 838 forms a tapered transmission line with the ground plane 706.
  • the distance 816 can be advantageously adjusted, for example by adjusting the angle 844, in order to match an input impedance of the helix 704 as desired.
  • the helix 804 has a second end 742 that is situated, in the present arrangement, three and a quarter turns from the first end 814 of the helix 704.
  • the spiral 702 is connected by an outer end there of to the second end 842 of the helix 704 at a radial location depicted by the reference numeral 838.
  • the spiral 702 has a uniform inter-turn pitch distance 836, and spirals inwards from the aforementioned outer end that is connected to the second end 842 of the helix, to an inner end 834 of the spiral 702.
  • Other types of spiral can also be used.
  • the spiral 702 is located in a plane horizontal to the axis 700.
  • the spiral 702 can however, in other arrangements, be formed to have a conical shape pointing either upwards or downwards.
  • a tapered transmission line being formed using the one quarter turn segment of the helix 704 between 814 and 838 and the ground plane 706, other impedance matching techniques such as quarter wave transmission line matching sections can be used to connect the first end 814 of the helix 704 to the intended communication apparatus thereby achieving the desired impedance matching.
  • the helix can be made of wire, wound on a low loss, low dielectric constant former to support the helix and spiral. Alternately, the helix can be etched in copper on a thin low loss dielectric film which is then rolled to form a cylinder. Either method provides the necessary mechanical support for reliable operation and causes minimal disturbance to the radiated wave.
  • This antenna element can be advantageously used in the frequency band between 1 GHz and 8 GHz, however it can also be used outside this frequency band. Furthermore, the addition of the spiral 702 to terminate the helix 704 is found to provide improved beam shaping and a significant decrease in the antenna axial ratio.
  • the antenna is ideally suited for two-way communications via satellite to vehicles, vessels or aircraft.
  • the antenna is a compact, low profile radiator exhibiting circular polarisation, making it ideally suited for use where size and performance are paramount such as in marine, aeronautical and land transport services.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

L'invention concerne un réseau d'antennes (100) dans lequel sont intercalés des éléments d'antennes d'émission (320) et des éléments d'antennes de réception (310) sur une base commune (230), en agençant, en sous réseaux (240), des sous-ensembles des éléments d'antennes d'émission et des sous-ensembles des éléments d'antennes de réception, en utilisant des lignes de transmission imprimées respectives (221) afin d'interconnecter les éléments d'antennes d'émission et les éléments d'antennes de réception sur chaque sous réseau, et pour chaque sous réseau, en utilisant des câbles (600) pour relier les sous réseaux d'éléments d'antennes d'émission interconnectés et les sous réseaux d'éléments d'antennes de réception interconnectés à l'entrée (400) et à la sortie (500) de l'antenne.
PCT/AU2006/001430 2005-09-30 2006-09-29 Agencement amélioré d'antennes Ceased WO2007036001A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2005905397A AU2005905397A0 (en) 2005-09-30 Improved antenna arrangement
AU2005905397 2005-09-30

Publications (1)

Publication Number Publication Date
WO2007036001A1 true WO2007036001A1 (fr) 2007-04-05

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Family Applications (1)

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PCT/AU2006/001430 Ceased WO2007036001A1 (fr) 2005-09-30 2006-09-29 Agencement amélioré d'antennes

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WO (1) WO2007036001A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2611307A (en) * 2021-09-29 2023-04-05 All Space Networks Ltd Multi-beam antenna array

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570546A1 (fr) * 1984-09-17 1986-03-21 Europ Agence Spatiale Antenne multifilaire helicoidale pour la transmission simultanee de plusieurs signaux d'emission et de reception vhf/uhf
US5400042A (en) * 1992-12-03 1995-03-21 California Institute Of Technology Dual frequency, dual polarized, multi-layered microstrip slot and dipole array antenna
US6243052B1 (en) * 1999-11-16 2001-06-05 Harris Corporation Low profile panel-configured helical phased array antenna with pseudo-monopulse beam-control subsystem
WO2002025775A1 (fr) * 2000-09-22 2002-03-28 Sarnoff Corporation Antenne adaptative multi-faisceau a bande ultra-large
US20030052828A1 (en) * 2001-09-12 2003-03-20 Metawave Communications Corporation Co-located antenna array for passive beam forming
US20030076274A1 (en) * 2001-07-23 2003-04-24 Phelan Harry Richard Antenna arrays formed of spiral sub-array lattices
US20040135732A1 (en) * 2003-01-15 2004-07-15 Lockheed Martin Corporation Dual port helical-dipole antenna and array
US20060040615A1 (en) * 2004-08-16 2006-02-23 Farrokh Mohamadi Wireless repeater

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570546A1 (fr) * 1984-09-17 1986-03-21 Europ Agence Spatiale Antenne multifilaire helicoidale pour la transmission simultanee de plusieurs signaux d'emission et de reception vhf/uhf
US5400042A (en) * 1992-12-03 1995-03-21 California Institute Of Technology Dual frequency, dual polarized, multi-layered microstrip slot and dipole array antenna
US6243052B1 (en) * 1999-11-16 2001-06-05 Harris Corporation Low profile panel-configured helical phased array antenna with pseudo-monopulse beam-control subsystem
WO2002025775A1 (fr) * 2000-09-22 2002-03-28 Sarnoff Corporation Antenne adaptative multi-faisceau a bande ultra-large
US20030076274A1 (en) * 2001-07-23 2003-04-24 Phelan Harry Richard Antenna arrays formed of spiral sub-array lattices
US20030052828A1 (en) * 2001-09-12 2003-03-20 Metawave Communications Corporation Co-located antenna array for passive beam forming
US20040135732A1 (en) * 2003-01-15 2004-07-15 Lockheed Martin Corporation Dual port helical-dipole antenna and array
US20060040615A1 (en) * 2004-08-16 2006-02-23 Farrokh Mohamadi Wireless repeater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2611307A (en) * 2021-09-29 2023-04-05 All Space Networks Ltd Multi-beam antenna array
WO2023052743A1 (fr) * 2021-09-29 2023-04-06 All.Space Networks Limited Réseau d'antennes à faisceaux multiples

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