GB1348672A - Microwave lenses - Google Patents

Microwave lenses

Info

Publication number
GB1348672A
GB1348672A GB3499071A GB1348672DA GB1348672A GB 1348672 A GB1348672 A GB 1348672A GB 3499071 A GB3499071 A GB 3499071A GB 1348672D A GB1348672D A GB 1348672DA GB 1348672 A GB1348672 A GB 1348672A
Authority
GB
United Kingdom
Prior art keywords
lens
reflector
spherical
focal point
movable
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.)
Expired
Application number
GB3499071A
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.)
British Aircraft Corp Ltd
Original Assignee
British Aircraft Corp 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
Application filed by British Aircraft Corp Ltd filed Critical British Aircraft Corp Ltd
Publication of GB1348672A publication Critical patent/GB1348672A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H01Q15/23—Combinations of reflecting surfaces with refracting or diffracting devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/12—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems

Landscapes

  • Aerials With Secondary Devices (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

1348672 Aerials; radar BRITISH AIRCRAFT CORP Ltd 14 July 1972 [26 July 1971] 34990/71 Headings H4A and H4D A spherical microwave lens is associated with a part-spherical reflector and means whereby said reflector is movable in use towards and away from said lens. In one embodiment, a spherical microwave lens 12, Fig. 2, of dielectric material is mounted within a nose cone 10 of a target aircraft. The focal point F of the lens is upon its rear surface, which is provided with a resistive coating 11 of colloidal graphite, or of carbon loaded cloth or rubber sheet. A reflector 13 in the nose cone 10 is of part-spherical form, and has an inside curvature approximately equal to the outside curvature of the lens 12. It is mounted on the end of a movable ram extending from an electric actuator, which may be controlled by signals from a programmer so that the reflector is either in contact with the lens or is up a quarter-wavelength (at the mean operating frequency) away from it. The amplitude of the reflected wave energy is greatest when the reflector is in contact with the lens, and is reduced as it is moved away. In another embodiment, Fig. 1 (not shown), the resistive coating on the back of the lens is omitted, and the focal point is arranged to be a half-wavelength (at the mean operating frequency) behind the rear surface. The reflector is movable about the focal point, whereby a variation in the phase of the reflected wave energy is produced. In this embodiment, the target aircraft is also provided with a spherical lens having a fixed part-spherical reflector. The arrangements may be used in radar testing, for example, to simulate glint.
GB3499071A 1971-07-26 1971-07-26 Microwave lenses Expired GB1348672A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3499071 1971-07-26

Publications (1)

Publication Number Publication Date
GB1348672A true GB1348672A (en) 1974-03-20

Family

ID=10372507

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3499071A Expired GB1348672A (en) 1971-07-26 1971-07-26 Microwave lenses

Country Status (3)

Country Link
US (1) US3787856A (en)
FR (1) FR2147235B1 (en)
GB (1) GB1348672A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194391A (en) * 1986-06-23 1988-03-02 Secr Defence Passive radar target

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4419669A (en) * 1971-01-04 1983-12-06 Trw Inc. Controlled scintillation rate decoy
US4287519A (en) * 1980-04-04 1981-09-01 The United States Of America As Represented By The Secretary Of The Navy Multi-mode Luneberg lens antenna
US5508704A (en) * 1994-06-16 1996-04-16 Hann; Lenn R. Method and apparatus for modulating a doppler radar signal
US5673049A (en) * 1996-01-26 1997-09-30 Kitchen; William J. Police radar jammer
US5883602A (en) * 1996-06-05 1999-03-16 Apti, Inc. Wideband flat short foci lens antenna
US10338187B2 (en) * 2017-01-11 2019-07-02 Raytheon Company Spherically constrained optical seeker assembly
US11300651B1 (en) * 2019-03-14 2022-04-12 The United States Of America, As Represented By The Secretary Of The Navy System for augmenting 360-degree aspect monostatic radar cross section of an aircraft

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716746A (en) * 1950-10-31 1955-08-30 Rca Corp Focusing of radar beams for a tracking radar
US2866971A (en) * 1956-09-05 1958-12-30 Kenneth S Kelleher Radiant energy reflector
US3116486A (en) * 1961-12-29 1963-12-31 Anton M Johnson Luneberg lens system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194391A (en) * 1986-06-23 1988-03-02 Secr Defence Passive radar target
GB2194391B (en) * 1986-06-23 1991-02-27 Secr Defence A passive radar target

Also Published As

Publication number Publication date
FR2147235B1 (en) 1977-04-01
FR2147235A1 (en) 1973-03-09
US3787856A (en) 1974-01-22

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee