EP2760082A1 - Antenne multibande directionnelle - Google Patents

Antenne multibande directionnelle Download PDF

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Publication number
EP2760082A1
EP2760082A1 EP13275018.3A EP13275018A EP2760082A1 EP 2760082 A1 EP2760082 A1 EP 2760082A1 EP 13275018 A EP13275018 A EP 13275018A EP 2760082 A1 EP2760082 A1 EP 2760082A1
Authority
EP
European Patent Office
Prior art keywords
optical
unit
lens
signals
antenna
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
EP13275018.3A
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German (de)
English (en)
Inventor
designation of the inventor has not yet been filed The
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.)
BAE Systems PLC
Original Assignee
BAE Systems PLC
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
Application filed by BAE Systems PLC filed Critical BAE Systems PLC
Priority to EP13275018.3A priority Critical patent/EP2760082A1/fr
Priority to ES14701619T priority patent/ES2788135T3/es
Priority to EP14701619.0A priority patent/EP2949001B1/fr
Priority to US14/762,678 priority patent/US9761941B2/en
Priority to PCT/GB2014/050206 priority patent/WO2014114954A1/fr
Publication of EP2760082A1 publication Critical patent/EP2760082A1/fr
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/06—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
    • H01Q5/22—RF wavebands combined with non-RF wavebands, e.g. infrared or optical

Definitions

  • the present invention relates to a directional multi-band antenna.
  • US 8 094 081 It is known from for example US 8 094 081 to provide a dual-band antenna which may transmit or receive a beam of electromagnetic radiation, at two distinct frequency/wavelength bands, to or from a further source.
  • the first band of electromagnetic radiation is in the visible to near infra-red spectrum (400 - 1500 nm), and the second band of electromagnetic radiation is in the radio frequency spectrum.
  • Such a device transmitting or receiving different wavelength/frequency beams along the same bore sight may alternatively be referred to as a 'common aperture' antenna.
  • a directional multi-band antenna comprising: -an optical unit comprising an optical sensor; -an RF unit comprising an RF sensor; -a substantially planar optical lens, the optical lens comprising surface relief elements for beam forming, the lens being arranged to focus optical signal beams, incident along a first optical axis, onto the optical sensor, the optical lens being substantially transparent to RF signals, -an RF beam forming device arranged to receive RF signals incident along the first optical axis and focus such RF signals onto the RF sensor.
  • Such an antenna may provide a particularly compact multi-band receiver that may be capable of receiving signals over ranges in the order of 1 km. If there is no visual obstruction in the reception path, the antenna may operate as a Free Space Optical (FSO) communication device; however, should there be optical obstructions, the antenna may switch to perform RF communications. Alternatively the antenna may receive at both RF and optical bands simultaneously.
  • FSO Free Space Optical
  • the optical unit may comprise an optical transmitter unit wherein the substantially planar optical lens is arranged to collimate optical signals emitted by the optical transmitter unit to form a beam parallel to the first optical axis.
  • the communications can have improved security and/or be more selective in establishing a link.
  • the optical unit may be positioned on the first optical axis to transmit and receive optical signals along the first optical axis
  • the optical unit may be offset from the optical axis, and wherein the RF unit is offset from the first optical axis.
  • the RF unit and the optical unit will each be arranged so as to be provided with an unobstructed focal region.
  • the RF beam forming device may be a substantially planar RF lens comprising surface relief elements for beam forming.
  • the RF beam forming device and the optical beam forming device may be integrated such that the surface relief elements of the RF lens are mounted on the surface relief elements of the optical lens.
  • Such provisions further tend to reduce the size of the device and thus make it more suitable for transportation and/or covert operation.
  • the substantially planar RF lens may provide an RF focal point for incoming RF signals, which RF focal point is separated from the optical focal point of the incoming Optical signals, and wherein the optical lens is located at the optical focal point and the RF unit is located at the RF focal point, such that neither unit obstructs the focal field associated with the other unit.
  • the antenna may be further provided with RF reflectors.
  • RF reflectors may be cheaper to provide as compared with other beam forming components.
  • the RF beam forming device may comprise RF reflectors and planar RF lenses with surface relief elements.
  • the optical unit may comprise at least one first sub-unit for transmitting optical signals and at least one second sub unit for receiving optical signals, the first and second sub units being separated.
  • the RF unit may be operable at a centre-frequency in the range between 50GHz and 70GHz.
  • Such a frequency range can provide highly localised and secure free space line of sight communications links as such frequencies are readily absorbed by the atmosphere.
  • the RF unit may comprise a transmitter, arranged in relation to the RF beam forming device such that the antenna is able to send substantially collimated RF signals.
  • the antenna may be directional insofar as it provides a beam collimated in one dimension only, so as to be able to perform a linear scan operation.
  • a first embodiment of a multiband directional antenna shown generally at 100, comprises an optical unit 108 and an RF unit 110 supported within a housing 10, and arranged to receive optical signals (shown in the Figures with solid arrow lines) and RF signals (shown in the Figures with dashed arrow lines).
  • the antenna is arranged such that certain optical and RF signals may propagate along a common axis A1 (shown in the Figures with a dot-dash line), or parallel thereto, through the mouth of the housing and onwards into the housing to illuminate the units..
  • a beam forming device 120 is provided at the mouth of the housing which comprises a substantially planar RF lens 122 adjacent to a substantially planar optical lens 121.
  • the lenses 121 and 122 are arranged such that incident optical or RF signals pass through the lenses in series.
  • the lenses 121, 122 define the axis A1 which intersects the lenses 121 and 122 and is perpendicular to the planes of the lenses 121 and 122.
  • the optical lens 121 is provided with a lensing structure in the form of an array of surface relief elements (e.g. micro-prisms 22a, 22b) each of which refracts a portion of an incident beam so that overall, the elements perform a predetermined manipulation (e.g. focussing radiation to a focal point at a particular location) on the incident radiation.
  • a predetermined manipulation e.g. focussing radiation to a focal point at a particular location
  • the optical lens 121 may be considered a Fresnel lens, or a device approximating thereto, for focussing incoming collimated light onto the optical unit 108 or for collimating light signals emitted by the optical unit 108.
  • the optical lens 121 comprises an array of densely-packed miniature surface relief elements, each surface relief element having a maximum dimension less than 1/10 th of the wavelength of the RF signal. As such the lens 121 is substantially transparent to RF signals and allows such to pass through without manipulation.
  • the RF lens 122 is provided with a lensing structure having an array of surface relief elements for manipulating an incident RF signal beam by refraction and/or diffraction. Further, the RF lens 122 is substantially transparent to optical signals and allows such to pass through without manipulation.
  • the optical unit 108 is for receiving and processing (or relaying onwards for processing) optical signals incident upon its sensors.
  • the optical unit 108 is also for transmitting optical signals.
  • the optical unit 108 operates with near infra-red (IR) radiation ( ⁇ 750 - 1700 nm).
  • IR infra-red
  • the optical unit 108 may be configured for use with a broader range of optical signals, 200 - 12,000 nm for example is contemplated for embodiments where UV signals may (in addition to visible and IR) be of interest.
  • the RF unit 110 is for receiving and processing (or relaying onwards for processing) RF signals incident upon its sensors.
  • the RF unit 110 is also for transmitting RF signals.
  • the RF unit 110 has an operational centre-frequency in the frequency range between 50GHz and 70GHz.
  • the optical unit 108 and the RF unit 110 are arranged within the housing 10 so as to be offset from one another with their sensors substantially in the same plane, which plane is generally perpendicular to the axis A1 and thus generally parallel with the lenses 121 and 122.
  • An arrangement such as this is chosen to prevent either unit obstructing the field of view of the other.
  • the beam forming device 120 is in some embodiments constructed according to the principles shown in Figure 2a and 2b .
  • the surface relief elements of the optical lens 121 to the surface relief elements of the RF lens 122 (or vice versa), it is possible to superimpose the effect of the optical surface relief elements 21a, 21b on the effect of the RF surface relief elements 22a, 22b.
  • a suitably angled wedge-profiled local RF element 22a for refracting the RF radiation is provided.
  • the wedge-shaped local RF element 22a is further provided with a plurality of suitably angled mini-wedge shaped local optical elements 22b which offer a flat boundary normal to the optical radiation whilst being sufficiently small (having a pitch less than 1/10 th the wavelength of the RF signals) such that they do not tend to significantly affect the RF radiation.
  • the local RF element 21a is no longer wedge-shaped but instead has the form of a flat sheet of material where the upper surface is parallel to the lower surface.
  • superimposed on the local RF element 21a is a plurality of local optical elements 21b which are effectively transparent to RF (on account of their short proportions relative to the RF wavelength) and allow RF to pass substantially unaffected.
  • the local optical elements 21b are shaped for refracting the optical radiation to suit a predetermined focal profile.
  • a beam steering/forming device 1120 may be provided in the aperture of the antenna 100.
  • the beam forming/steering device 1120 is comprised by a first planar lens 1122 for focussing the RF signal, operating in conjunction with, but spaced apart from, a second planar lens 1121 for focussing the optical signal.
  • planar RF lens 1122 is in the form of a multi-order stepped-element array which approximates in four-levels to a quadratic blaze profile (formed for example by a four step photolithographic process).
  • the stepped elements form a predominantly diffractive lens (though some refraction may occur) and thus function to manipulate the passing RF signal but, having no inclined angle, do not tend to substantially refract or otherwise distort the optical radiation passing therethrough.
  • planar optical lens 1121 is in the form of a Fresnel lens formed by a micro-prism array where the dimensions of each prism are too small to affect the RF radiation passing therethrough.
  • a Fresnel lens with over two grooves per millimetre such as manufactured by Edmund Optics ( www.edmundoptics.com , regional office Edmund Optics Ltd, Unit 1, Opus Avenus, Nether Poppleton, York, United Kingdom), may be used to render the optical lens 1121 effectively transparent to RF signals because the scale of the surface structures is too small (the pitch is less than a 1/10 th of the wavelength of a 60GHz RF signal) to affect the RF signal.
  • the beam forming planar lenses including the surface relief elements 22a, 22b, 21b, 21a, 1121, 1122 should be formed from a material that is transparent to both optical radiation and the RF signal (e.g. millimetric wavelength RF signals).
  • the elements chosen for use in the present invention are formed from at least one of a group comprising: quartz, perspex, polycarbonate and sapphire.
  • the material chosen from this group should have a well-defined dielectric constant.
  • the antenna 100 may receive optical and/or RF signals.
  • optical radiation impinging on the antenna 100 along axis A1 or impinging parallel thereto and within the mouth of the housing 10 will be focussed, by the elements defining the optical lens 121 or 1121, onto the sensors of the optical unit 108.
  • RF radiation impinging on the antenna 100 along axis A1 or impinging parallel thereto and within the mouth of the housing 10 will be focussed, by the elements defining the RF lens 122 or 1122, onto the sensors of the optical unit 110.
  • the antenna 100 may also transmit RF and/or optical signals.
  • the optical unit 108 If transmitting optical signals, the optical unit 108 generates and emits an optical signal which propagates divergently towards the optical lens 121 or 1121 of the beam forming device 120 or 1120.
  • the optical signal is thus collimated by the device 120 or 1120 and propagates from the antenna unit 100 as a beam parallel with and centred about axis A1.
  • RF signals are generated at the RF unit 110 which propagate divergently onto the RF lensing structure of the device 120 or 1120, whereupon the RF signals are collimated and form a beam parallel with and centred about axis A1.
  • the antenna 100 may send or receive RF signals and, simultaneously and independently of the RF signals, send or receive Optical signals.
  • a second embodiment of the invention is shown, with reference to Figure 3 , and indicated generally at 200, which may be particularly suited for retrofitting to existing RF receivers and transmitters.
  • the antenna 200 comprises an RF unit 110 for receiving and transmitting RF signals.
  • the RF unit 110 extends through an aperture at the centre of a parabolic reflector 201 and faces a plate reflector 202, which is in this embodiment in the form of a splash plate reflector (in alternative embodiments the plate reflector 202 may be a ring focus sub-reflector).
  • the RF unit 110 defines an antenna axis A2 about which the parabolic reflector 201 is symmetrical and to which the plate reflector 202 is perpendicular.
  • an optical unit 108 Mounted behind the plate reflector 202 (that is to say on the opposite side of the plate reflector 202 to the RF unit 110) is an optical unit 108 that faces along the axis A2 in the same outward direction as the RF unit 110.
  • the optical unit 108 is for transmitting and receiving optical signals and is located behind a planar optical lens 221 (i.e. the optical lens is further from the plate reflector 202 than the optical unit 108).
  • the optical lens 221 may have a form equivalent to the prism array Fresnel lens 1121 discussed above with reference to Figure 2c , but with the focal properties predetermined according to the local housing, housing 210.
  • the optical lens 221 is substantially perpendicular to the axis A2 and is arranged to both focus incoming optical radiation onto the sensors of the optical unit 108 and to collimate outgoing optical radiation.
  • the planar optical lens 221 is substantially transmissive/transparent to RF signals.
  • a generally tubular housing 210 surrounds and is attached to the periphery of the parabolic reflector 202 and the periphery of the optical lens 221. Thus support may be provided to the components of the antenna 200.
  • the RF unit 110 If operating to transmit RF signals, the RF unit 110 generates an RF signal which propagates divergently towards the planar splash plate reflector 202. Upon illuminating the plate reflector 202, at least a portion of the RF signal is reflected backwards towards the parabolic reflector 201. Upon impinging on the parabolic reflector 201, the RF signal is reflected and collimated to propagate as a beam parallel with and centred about axis A2.
  • the planar optical lens 221 is substantially transmissive of RF signals and so the RF beam may pass through this lens with little or no loss or manipulation.
  • beams of RF propagating through the optical lens 221 and onto the parabolic reflector 201 along axis A2 or parallel thereto and within the mouth of the housing, will be reflected onto the RF unit 210 via the planar reflector 202.
  • the optical unit 108 If operating to transmit optical signals, the optical unit 108 generates an optical signal which divergently propagates towards the optical lens 221. Upon incidence on the optical lens 221, the elements of the lens 221 refract the signal, in a predetermined manner given the position of the optical unit 108 relative to the lens 221, such that optical signals transmitted onwards from the lens 221 are collimated as a beam parallel with and centred about axis A2.
  • a third embodiment of an antenna according to the invention is indicated generally at 300 in Figure 4 .
  • the antenna 300 is similar to the second embodiment antenna 200 for example insofar as its RF band reception and transmission apparatus and operation is concerned: there is an RF unit 110 disposed at the centre of a parabolic reflector 201, the RF unit 110 being directed towards a plate reflector 202. Further, the antenna 300 is provided with a planar lens 321 that is generally transparent to RF radiation and is secured in front of the parabolic reflector by a generally tubular housing 210, which housing also surrounds and supports the parabolic reflector 201.
  • the optical unit comprises optical transmit sub-units 308b and separate optical receive sub-units 308a.
  • the optical transmit sub-units 308b are arranged around the outside of the tubular housing 210 and emit collimated light.
  • the optical receive sub-units 308a are arranged towards the central axis of the parabolic reflector 201, and generally surrounding the RF unit 110.
  • the optical lens 321 may have a general form equivalent to the prism array Fresnel lens 1121 discussed above with reference to Figure 2c , but with the focal properties predetermined according to the embodiment dimensions. Further, to minimise the area of the lens, the lens may be an annular lens, or a plurality of lenses mounted in a ring, because the central portion, which is obscured from the sensor 308a by the splash plate 202 and the RF unit need not manipulate incident radiation.
  • the lens 321 is able to focus collimated light, incident along the device axis A2 or parallel thereto, and from the far field, onto the sensors of the optical receive units 308a.
  • the units 308b When transmitting optical signals, the units 308b each generate and emit a collimated optical signal which propagates along an axis parallel to Axis A2.
  • a fourth embodiment of an antenna according to the invention is indicated generally at 400 in Figure 5 .
  • the antenna 400 is similar to the second and third embodiment antennas (200 and 300 respectively) for example insofar as its RF band reception and transmission apparatus and operation is concerned: there is an RF unit 110 disposed at the centre of a parabolic reflector 201, the RF unit 110 being directed towards a splash plate reflector 202. Further, the antenna 400 is provided with a planar lens 420 that is generally transparent to RF radiation and is secured in front of the parabolic reflector 201 by a generally tubular housing 210, which housing 210 also surrounds and supports the parabolic reflector 201.
  • the optical transmit and receive apparatus are arranged in the antenna 400 such that there is provided a receive sub-unit 408a and transmit sub-units 408b. Each transmit unit 308b is separate from the receive unit 308a.
  • the optical receive sub-unit 408a is mounted in front of the splash plate 202, on the axis A2, with sensors pointing towards the planar lens 420, and thereby being arranged to receive light along the axis A2 from a central optical lens 421a of the planar lens 420.
  • the central optical lens 421a of the planar lens 420 is configured to focus light, incoming over axis A2 or parallel thereto, onto the sensors of the optical receive sub-unit 408a.
  • the central optical lens 421a has a general form equivalent to the micro-prism array Fresnel lens 1121 discussed above with reference to Figure 2c , but with the focal properties predetermined according to the embodiment dimensions.
  • optical transmit sub-units 408b which may be optical fibres extending through the reflector 201, are arranged towards the periphery of the parabolic reflector 201, to emit divergent light towards the planar lens 420.
  • the planar lens 420 is provided with transmit optical lenses 421b. Such transmit lenses 421b are located at the planar lens 420 and are peripheral to the central receive lens 421a.
  • the transmit lens 421b is formed by a plurality of discrete lenses which are arranged in a ring, each discrete lens being paired-up with and focussed on a particular transmit optical unit 408b. As such, light emitted by a given transmitter 408b will be collimated at the corresponding lens 421b and form a beam propagating along an axis parallel to axis A2.
  • Each of the transmit lenses 421a has a general form equivalent to the prism array Fresnel lens 1121 discussed above with reference to Figure 2c , but with the focal properties predetermined according to the embodiment dimensions.
  • an optical coupling device 50 is shown as may be included in an optical unit, such as 108, for transmitting or receiving collimated light.
  • the optical unit could be provided with a suitable lens to adapt the unit for receiving non-collimated (e.g. convergent) light.
  • the coupling device comprises a lens 52 arranged in the beam and configured to focus the beam to an optical fibre 54 (though other optical conduits may be used in alternative embodiments).
  • the optical fibre 54 may transfer optical signals to and from an optical processing module (not shown).
  • a more complex optical coupling device referred to generally at 51 is shown in Figure 6b .
  • device 51 comprises an active lens 53 and also is provided with a beam splitter 55 positioned between the lens 53 and the optical fibre 54.
  • the beam splitter 55 is arranged to reflect a portion (typically 10%) of the incoming light signal to an optical sensor 57.
  • the optical sensor 57 is connected to a lens control unit 58 such that the active lens 53 may take on an optimal shape for focussing/collimating the light signal, having considered the sample taken from the beam splitter 55.
  • the active lens 53 may be a fluidic lens and/or may be provided on a tip-tilt mount and thereby be able to perform beam steering operations.
  • the optical coupling device 51 may be provided with an array of sensors 59 surrounding the optical fibre 54.
  • the array of sensors 59 are mounted on a planar substrate which is arranged perpendicularly to the beam axis.
  • the array of sensors 59 may be interfaced with the control unit 58 of the active lens 53 such that the condition of the light signal at the fibre 54 may be fed back to the lens 53, and the lens 53 adapted accordingly.
  • the above embodiments could be suitable for operation in various RF frequency ranges provided that the dimensions of the reflectors and/or surface elements are appropriately designed to match any chosen operational frequency. Particular frequency ranges contemplated would be in the 50GHz to 70GHz range and more particularly in the region of 60GHz. However, other embodiments may operate in the super high frequency (3-30GHz) or extremely high frequency (30-3000GHz) ranges. Dimensions of the antenna are somewhat dictated by the operational frequency and desired antenna gain (for example the diameter of the primary parabolic reflector 201 with a nominal 30dB gain may be approximately 0.3m for a 10 GHz carrier frequency, but may be approximately 2m for a 1.5 GHz band carrier frequency).
  • lensing structures for planar lenses are contemplated for use with the present invention.
  • the skilled man would, upon reading this application, readily understand the alternative lensing structures which could be applied to work the invention.
  • devices understood as being kinoforms, volume holograms, zonal masks etc. could be used.
  • the RF unit may in general be an RF Horn or a plain waveguide end emitter provided with a beam shaping dielectric lens.
  • a linear-scan directional antenna may be provided having a beam that is collimated in a first aspect but diverges in a second aspect.
  • a beam could be collimated horizontally but diverge vertically so as to permit scanning in the azimuth.

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EP13275018.3A 2013-01-28 2013-01-28 Antenne multibande directionnelle Ceased EP2760082A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP13275018.3A EP2760082A1 (fr) 2013-01-28 2013-01-28 Antenne multibande directionnelle
ES14701619T ES2788135T3 (es) 2013-01-28 2014-01-27 Antena direccional multibanda
EP14701619.0A EP2949001B1 (fr) 2013-01-28 2014-01-27 Antenne multibande directionnelle
US14/762,678 US9761941B2 (en) 2013-01-28 2014-01-27 Directional multiband antenna
PCT/GB2014/050206 WO2014114954A1 (fr) 2013-01-28 2014-01-27 Antenne multibande directionnelle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13275018.3A EP2760082A1 (fr) 2013-01-28 2013-01-28 Antenne multibande directionnelle

Publications (1)

Publication Number Publication Date
EP2760082A1 true EP2760082A1 (fr) 2014-07-30

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EP13275018.3A Ceased EP2760082A1 (fr) 2013-01-28 2013-01-28 Antenne multibande directionnelle

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EP (1) EP2760082A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016030715A1 (fr) * 2014-08-25 2016-03-03 Audi Ag Procédé de transmission de données, et dispositif de transmission correspondant
CN106796100A (zh) * 2014-08-25 2017-05-31 奥迪股份公司 光学位置检测方法、光学位置检测装置和光学位置检测系统
CN112243592A (zh) * 2018-05-30 2021-01-19 索尼公司 通过较低频带信令调度和触发毫米波发现协助
US11438062B2 (en) 2020-10-30 2022-09-06 Honeywell Limited Honeywell Limitée Optical and radio frequency terminal for space-to-ground communications
CN115359944A (zh) * 2022-10-20 2022-11-18 泉州师范学院 一种实现任意空间指向光链焦场的方法

Citations (4)

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Publication number Priority date Publication date Assignee Title
DE3505583A1 (de) * 1984-02-27 1985-10-03 United Technologies Corp., Hartford, Conn. Radarantennenanordnung und verfahren zum bilden derselben
GB2215454A (en) * 1988-03-09 1989-09-20 Racal Guardall Passive infrared security sensors
US5973649A (en) * 1997-10-28 1999-10-26 Alliant Techsystems, Inc. Common aperture dual mode semi-active laser/millimeter wave sensor
US8094081B1 (en) 2007-10-25 2012-01-10 The Johns Hopkins University Dual band radio frequency (RF) and optical communications antenna and terminal design methodology and implementation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3505583A1 (de) * 1984-02-27 1985-10-03 United Technologies Corp., Hartford, Conn. Radarantennenanordnung und verfahren zum bilden derselben
GB2215454A (en) * 1988-03-09 1989-09-20 Racal Guardall Passive infrared security sensors
US5973649A (en) * 1997-10-28 1999-10-26 Alliant Techsystems, Inc. Common aperture dual mode semi-active laser/millimeter wave sensor
US8094081B1 (en) 2007-10-25 2012-01-10 The Johns Hopkins University Dual band radio frequency (RF) and optical communications antenna and terminal design methodology and implementation

Non-Patent Citations (1)

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Title
DONALD N BLACK ET AL: "Millimeter-Wave Characteristics of Phase-Correcting Fresnel Zone Plates", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. MTT-35, no. 12, 1 December 1987 (1987-12-01), pages 1122 - 1129, XP001383111, ISSN: 0018-9480 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016030715A1 (fr) * 2014-08-25 2016-03-03 Audi Ag Procédé de transmission de données, et dispositif de transmission correspondant
CN106664138A (zh) * 2014-08-25 2017-05-10 奥迪股份公司 数据传输方法和相应的传输装置
CN106796100A (zh) * 2014-08-25 2017-05-31 奥迪股份公司 光学位置检测方法、光学位置检测装置和光学位置检测系统
CN106664138B (zh) * 2014-08-25 2019-10-29 奥迪股份公司 数据传输方法和相应的传输装置
CN106796100B (zh) * 2014-08-25 2019-12-03 奥迪股份公司 光学位置检测方法、光学位置检测装置和光学位置检测系统
CN112243592A (zh) * 2018-05-30 2021-01-19 索尼公司 通过较低频带信令调度和触发毫米波发现协助
CN112243592B (zh) * 2018-05-30 2023-09-15 索尼公司 通过较低频带信令调度和触发毫米波发现协助
US11438062B2 (en) 2020-10-30 2022-09-06 Honeywell Limited Honeywell Limitée Optical and radio frequency terminal for space-to-ground communications
CN115359944A (zh) * 2022-10-20 2022-11-18 泉州师范学院 一种实现任意空间指向光链焦场的方法
CN115359944B (zh) * 2022-10-20 2023-02-28 泉州师范学院 一种实现任意空间指向光链焦场的方法

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