US3787856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spherical microwave lenses
Assignee: BAC AND BRITISH AEROSPACE
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Filing: 1972-07-18
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Granted: 1974-01-22
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Expires: 1992-07-18
Abstract
Abstract A spherical microwave lens and reflector arrangement in which the reflector is part-spherical and is mounted so as to be movable towards and away from the lens in order that variations in the phase or amplitude of a reflected signal may be produced.
Inventors
- 👤 P Pyrah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:25
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/23; H01Q3/00; H01Q3/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 words
A microwave lens arrangement comprising a spherical microwave lens with a focus approximately on its surface and an electrically resistive material over part of its outer surface, and a part spherical reflector movable towards and away from the lens between positions where it is against the resistive coating or spaced from it by approximately one quarter of a wavelength, whereby movement of the reflector produces a variation in the amplitude of a reflected wave.
Claim 2
Dependent Claim
74 words
A microwave lens arrangement comprising a spherical microwave lens with a focus approximately on its surface and an electrically resistive material over part of its outer surface, and a part spherical reflector movable towards and away from the lens between positions where it is against the resistive coating or spaced from it by approximately one quarter of a wavelength, whereby movement of the reflector produces a variation in the amplitude of a reflected wave.
Claim 3
Dependent Claim
17 words
A microwave lens arrangement as in claim 1 wherein the electrically resistive material is carbon loaded cloth.
Claim 4
Dependent Claim
17 words
A microwave lens arrangement as in claim 1 wherein the electrically resistive material is carbon loaded rubber.
Claim 5
Dependent Claim
16 words
A microwave lens arrangement as in claim 1 wherein the electrically resistive material is colloidal graphite.
Claim 6
Independent Claim
71 words
An apparatus for simulating the glint of an object illuminated by a radar beam including, in combination, two spherical microwave lenses spaced transversely to the radar beam, a fixed reflector associated with one lens, a movable reflector associated with the other lens, and means for moving the movable reflector towards and away from its associated lens thereby varying the phase difference between the beams reflected from the fixed and movable reflectors.
Claim 7
Independent Claim
71 words
An apparatus for simulating the glint of an object illuminated by a radar beam including, in combination, two spherical microwave lenses spaced transversely to the radar beam, a fixed reflector associated with one lens, a movable reflector associated with the other lens, and means for moving the movable reflector towards and away from its associated lens thereby varying the phase difference between the beams reflected from the fixed and movable reflectors.
Claim 8
Independent Claim
72 words
An apparatus for simulating the glint of an object illuminated by a radar beam including in combination two transversely spaced spherical microwave lenses, a separate reflector associated with each lens and movable towards and away from its associated lens and means for moving the reflectors independently of each other whereby movement of at least one of the reflectors produces a variation of the phase difference between the beams reflected by said reflectors.
Claim 9
Independent Claim
72 words
An apparatus for simulating the glint of an object illuminated by a radar beam including in combination two transversely spaced spherical microwave lenses, a separate reflector associated with each lens and movable towards and away from its associated lens and means for moving the reflectors independently of each other whereby movement of at least one of the reflectors produces a variation of the phase difference between the beams reflected by said reflectors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |