GB2260448A - Dual mode antenna - Google Patents

Dual mode antenna Download PDF

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Publication number
GB2260448A
GB2260448A GB9220758A GB9220758A GB2260448A GB 2260448 A GB2260448 A GB 2260448A GB 9220758 A GB9220758 A GB 9220758A GB 9220758 A GB9220758 A GB 9220758A GB 2260448 A GB2260448 A GB 2260448A
Authority
GB
United Kingdom
Prior art keywords
energy
dual mode
layer
mode antenna
mirror
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.)
Withdrawn
Application number
GB9220758A
Other versions
GB9220758D0 (en
Inventor
Yishay Netzer
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.)
Israel Ministry of Defence
State of Israel
Original Assignee
Israel Ministry of Defence
State of Israel
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 Israel Ministry of Defence, State of Israel filed Critical Israel Ministry of Defence
Publication of GB9220758D0 publication Critical patent/GB9220758D0/en
Publication of GB2260448A publication Critical patent/GB2260448A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • 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

Abstract

Dual mode antenna apparatus including a primary mirror assembly 10 which receives IR and RF energy from a field or view, the primary mirror assembly including a first mirror layer 12 which reflects IR energy and is generally transparent to RF energy and a second layer 14 which receives RF energy via the first mirror layer. Preferably the antenna also includes a secondary mirror assembly 16 arranged to receive IR energy reflected from the first mirror layer and to reflect it to IR detector apparatus 28. An IR image detector may be arranged to receive the IR energy and provide image information therefrom. The second layer preferably includes an antenna which produces electrical signals in response to the RF energy. <IMAGE>

Description

e 11 i DUAL MODE ANTENNA APPARATUS
FIELD OF THE INVENTION
The present invention relates to antennas and more particularly to dual mode antennas for and radio frequencies.
generally infra-red BACKGROUND OF THE INVENTION
Various types of dual mode antennas are known. There is known in U.S. Patent 4,477,814 a dual mode radio frequency infrared frequency system in which a, single, common, surface is used in the dual modes of radiating and absorbing RF energy and of reflecting and focusing IR energy. The common surface is structured, configured and used as the slotted array antenna for the RF energy and as the primary mirror of a Cassegrain optical subsystem for the IR energy.
SUMMARY OF THE INVENTION
The present invention seeks to provide an improved dual mode antenna capable of radiating and absorbing RF energy and of reflecting and focusing IR energy.
There is thus provided in accordance with a embodiment of the present invention a dual mode antenna including a primary mirror assembly which receives IR and RF energy from a field of view, the primary mirror assembly including a first mirror layer which reflects IR energy and transmits RF energy and a second layer which receives RF via the first mirror layer, a secondary mirror preferred energy assembly arranged to receive IR energy reflected from the first mirror layer and to reflect it to IR detector apparatus.
Preferably the second layer comprises an antenna which produces electrical signals in response to said RF energy.
In accordance with a preferred embodiment of the 1 present invention there is provided a system including the dual mode antenna described above as well as IR detector apparatus including scanner apparatus and a cooled IR detector.
z ill 2 1 i i BRIEF DESCRIPTION OF THE DRAWING
The present invention will be understood and appreciated more fully from the following detailed description, taken in conjunction with the drawing in which:
Fig. 1 is a simplified schematic illustration of a dual mode antenna system constructed and operative in accordance with a preferred embodiment of the present invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
Reference is now made to Fig. 1, which illustrates a dual mode antenna system constructed and operative in accordance with a preferred embodiment of the present invention. The dual mode antenna system preferably includes a primary receiver assembly 10 which receives IR and RF energy from a field of view. The primary receiver assembly preferably includes a first mirror layer 12, typically formed of a dielectric substrate, such as silica having a multi-layer dielectric reflective coating, which reflects IR energy and is generally transparent to RF energy and a second layer 14, typically comprising a printed circuit antenna array, which receives RF energy via the first mirror layer and supplies it to an RF energy utilization device 15, such as a radar receiver. The printed circuit antenna array may comprise a slotted antenna or alternatively a multi-slit antenna.
The antenna system also comprises a secondary mirror assembly 16 arranged to receive IR energy reflected from the first mirror layer 12 and to reflect it to IR detector apparatus 18. The secondary mirror assembly and its supports should be non-metallic such that they are transparent to RF.
In accordance with a preferred embodiment of the present invention the IR detector apparatus 18 includes reflectors 20 and 22, a nodding scanner mirror 24, lens apparatus 26 and a cooled IR detector 28 and may be entirely 3 conventional.
The antenna system of the present invention preferably forms part of a transceiver system which both transmits and receives RF energy.
It will be appreciated by persons skilled in the art that the present invention is not limited by what has been described above, rather the scope of the present invention is defined only by the claims which follow:
4

Claims (5)

  1. C L A I M S
    Dual mode antenna apparatus comprising:
    a primary mirror assembly which receives IR and RF energy from a field of view, said primary mirror assembly including a first mirror layer which reflects IR energy and is generally transparent to RF energy and a second layer which receives RF energy via said first mirror layer.
  2. 2. Dual mode antenna apparatus according to claim 1 and also comprising an IR image detector arranged to receive the IR energy and operative to provide image information therefrom.
  3. 3. Dual mode antenna apparatus according to claim 1 and further comprising:
    a secondary mirror assembly arranged to receive IR energy reflected from the first mirror layer and to reflect it to IR detector apparatus.
  4. 4. Dual mode apparatus according to claim 2 and further comprising:
    a secondary mirror assembly arranged to receive IR energy reflected from the first mirror layer and to reflect it to the IR detector apparatus.
  5. 5. Dual mode antenna apparatus according to any of the preceding claims, wherein said second layer comprises antenna which produces electrical signals in said RF energy.
    Dual mode antenna apparatus according to an preceding claims wherein the second layer is also to transmit RF energy via the first mirror layer.
    an response to o f the operative Dual mode antenna apparatus constructed and attached to operate substantially as hereinbefore described with reference to and, as illustrated in, the accompanying drawing.
GB9220758A 1991-10-09 1992-10-02 Dual mode antenna Withdrawn GB2260448A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IL9968791 1991-10-09

Publications (2)

Publication Number Publication Date
GB9220758D0 GB9220758D0 (en) 1992-11-18
GB2260448A true GB2260448A (en) 1993-04-14

Family

ID=11062938

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9220758A Withdrawn GB2260448A (en) 1991-10-09 1992-10-02 Dual mode antenna

Country Status (3)

Country Link
DE (1) DE4234274A1 (en)
FR (1) FR2685552A1 (en)
GB (1) GB2260448A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5835057A (en) * 1996-01-26 1998-11-10 Kvh Industries, Inc. Mobile satellite communication system including a dual-frequency, low-profile, self-steering antenna assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4477814A (en) * 1982-08-02 1984-10-16 The United States Of America As Represented By The Secretary Of The Air Force Dual mode radio frequency-infrared frequency system
JPS62234105A (en) * 1986-04-04 1987-10-14 Mitsubishi Electric Corp Light and radio wave separating film
JPS6360402A (en) * 1986-09-01 1988-03-16 Mitsubishi Electric Corp Light-radio wave separating plate
EP0281042A2 (en) * 1987-03-04 1988-09-07 Alliant Techsystems Inc. Multi-spectral imaging system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3165749A (en) * 1958-09-15 1965-01-12 Thompson Ramo Wooldridge Inc Microwave transmissive optical radiation reflectors
US3114149A (en) * 1961-12-04 1963-12-10 Philco Corp Combined radar and infra-red conical scanning antenna
FR2356130A1 (en) * 1976-02-27 1978-01-20 Dassault Electronique RADIANT ENERGY SENSOR
JPS61178683A (en) * 1985-02-05 1986-08-11 Mitsubishi Electric Corp Transmitting and receiving apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4477814A (en) * 1982-08-02 1984-10-16 The United States Of America As Represented By The Secretary Of The Air Force Dual mode radio frequency-infrared frequency system
JPS62234105A (en) * 1986-04-04 1987-10-14 Mitsubishi Electric Corp Light and radio wave separating film
JPS6360402A (en) * 1986-09-01 1988-03-16 Mitsubishi Electric Corp Light-radio wave separating plate
EP0281042A2 (en) * 1987-03-04 1988-09-07 Alliant Techsystems Inc. Multi-spectral imaging system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5835057A (en) * 1996-01-26 1998-11-10 Kvh Industries, Inc. Mobile satellite communication system including a dual-frequency, low-profile, self-steering antenna assembly

Also Published As

Publication number Publication date
DE4234274A1 (en) 1993-04-15
GB9220758D0 (en) 1992-11-18
FR2685552A1 (en) 1993-06-25

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)