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Patent US4647940A successfully refreshed from Google Patents.
US4647940A
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Parallel plate waveguide antenna
Assignee: Rogers Corp
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Filing: 1982-09-27
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Granted: 1987-03-03
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Expires: 2002-09-27
Abstract
Abstract A parallel plate waveguide microwave antenna is presented in which transmission or reception of microwave energy is effected by radiating waveguide slots or apertures in a metallized glass plate or plate of other rigid dielectric material. The metallized glass plate cooperates with another metallized glass plate or other rigid dielectric material or a metal plate to define a parallel plate waveguide with air or an inert gas or vacuum as the dielectric between the plates. When used as a transmitter antenna, a central electrode propagates waves in the dielectric medium in expanding circles; and the slots or apertures in the metal layer act as scattering sites to couple the waves to free space. When used as a receiver antenna, the reverse will occur.
Inventors
- 👤 G. Robert Traut
- 👤 Geoff J. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:37
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/0006; H01Q21/0012; H01Q17/00; H01Q17/001
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
135 words
A parallel plate waveguide antenna including: a first glass plate; conductive means on one surface of said first plate defining a ground plane for a parallel plate waveguide antenna; a second glass plate spaced from said first plate and substantially parallel thereto; conductive coating means on one surface of said second plate means having a plurality of radiating apertures in a predetermined pattern; said conductive means and said conductive coating means being on interior facing surfaces of the first and second plates; spacer means for maintaining said first and second plates in spaced apart relation and defining a space between said plates; and microwave transmission means having a first conductor connected to said ground plane and a second conductor extending into said space between said first and second plates to serve as a launch electrode.
Claim 2
Dependent Claim
135 words
A parallel plate waveguide antenna including: a first glass plate; conductive means on one surface of said first plate defining a ground plane for a parallel plate waveguide antenna; a second glass plate spaced from said first plate and substantially parallel thereto; conductive coating means on one surface of said second plate means having a plurality of radiating apertures in a predetermined pattern; said conductive means and said conductive coating means being on interior facing surfaces of the first and second plates; spacer means for maintaining said first and second plates in spaced apart relation and defining a space between said plates; and microwave transmission means having a first conductor connected to said ground plane and a second conductor extending into said space between said first and second plates to serve as a launch electrode.
Claim 3
Dependent Claim
31 words
A parallel plate waveguide antenna as in claim 1 wherein: said second plate has a dielectric constant of not more than 8 and a loss tangent of not more than 0.01.
Claim 4
Dependent Claim
38 words
A parallel plate waveguide antenna as in claim 1 wherein: said second plate has a thickness of between approximately 0.1 inches to one half the wavelength in the plate of a microwave signal being received by the antenna.
Claim 5
Dependent Claim
27 words
A parallel plate waveguide antenna as in claim 1 wherein: the coefficients of thermal expansion of said first and second plate and said spacer means are matched.
Claim 6
Dependent Claim
17 words
A parallel plate waveguide antenna as in claim 1 wherein: said space between said plates is sealed.
Claim 7
Dependent Claim
17 words
A parallel plate waveguide antenna as in claim 5 wherein: said space between said plates contains air.
Claim 8
Dependent Claim
19 words
A parallel plate waveguide antenna as in claim 5 wherein: said space between said plates contains an inert gas.
Claim 9
Dependent Claim
17 words
A parallel plate waveguide antenna as in claim 5 wherein: said space between said plates is evacuated.
Claim 10
Dependent Claim
38 words
A parallel plate waveguide antenna as in claim 1 wherein: said second plate has a thickness of between approximately 0.1 inches to one half the wavelength in the plate of a microwave signal being received by the antenna.
Claim 11
Dependent Claim
17 words
A parallel plate waveguide antenna as in claim 1 wherein: said space between said plates is sealed.
Claim 12
Dependent Claim
17 words
A parallel plate waveguide antenna as in claim 10 wherein: said space between said plates contains air.
Claim 13
Dependent Claim
19 words
A parallel plate waveguide antennas as in claim 10 wherein: said space between said plates contains an inert gas.
Claim 14
Dependent Claim
17 words
A parallel plate waveguide antenna as in claim 10 wherein: said space between said plates is evacuated.
Claim 15
Dependent Claim
27 words
A parallel plate waveguide antenna as in claim 1 wherein: the coefficients of thermal expansion of said first and second plate and said spacer means are matched.
Claim 16
Dependent Claim
24 words
A parallel plate waveguide antenna as in claim 1 including: energy absorption means at the outer periphery of said space to prevent wave reflection.
Claim 17
Dependent Claim
20 words
A parallel plate waveguide antenna as in claim 15 wherein: said energy absorption means is a ring of lossy material.
Claim 18
Dependent Claim
25 words
A parallel plate waveguide antenna as in claim 1 wherein: said coating means is a metallic coating with a plurality of radiating slots or apertures.
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) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |