US3754255A
Expired / Lapsed
US
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Wide band flexible wave absorber
Assignee: Tokyo Institute of Technology
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Filing: 1971-04-05
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Granted: 1973-08-21
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Expires: 1991-04-05
Abstract
Abstract This invention relates to a flexible super-wide band wave absorber composed of a mixture of ferromagnetic and dielectric materials. One form of the wave absorber is composed of a plurality of ferrites having different magnetic resonant frequencies. A further embodiment uses a dielectric material having a high dielectric constant. The wave absorber can be semispherically shaped to form a non-directional wave absorber.
Inventors
- 👤 K Suetake
- 👤 T Musha
- 👤 Y Naito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:38
CPC Classifications
H; H01; H01Q; H01Q17/00; H01Q17/004; H01Q17/008
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
23 words
A wave absorber as in claim 1 wherein each of said ferrite materials is composed of a mixture of ferrite and dielectric material.
Claim 2
Dependent Claim
18 words
A wave absorber as in claim 1 wherein the sections have a surface area determined by the formula
Claim 3
Dependent Claim
17 words
A wave absorber as in claim 2 wherein said dielectric material has a high specific dielectric constant.
Claim 4
Dependent Claim
29 words
A wave absorber as in claim 1 wherein each of said ferrite materials is further comprised of a mixture of at least two ferrites having different magnetic resonant frequencies.
Claim 5
Dependent Claim
16 words
A wave absorber as in claim 4 wherein said specific dielectric constant is more than five.
Claim 6
Dependent Claim
22 words
A wave absorber as in claim 2 wherein said dielectric material is further comprised of a ferroelectric material and a dielectric binder.
Claim 7
Dependent Claim
23 words
A wave absorber as in claim 1 wherein each of said ferrite materials is of uniform thickness and said ferrite plate is flat.
Claim 8
Dependent Claim
13 words
A wave absorber as in claim 2 wherein said dielectric material is rubber.
Claim 9
Dependent Claim
15 words
A wave absorber as in claim 2 wherein said dielectric material is a synthetic resin.
Claim 10
Dependent Claim
27 words
A wave absorber as in claim 2 wherein said mixture is in a predetermined ratio said ratio dependent upon the frequency of the wave to be absorbed.
Claim 11
Dependent Claim
14 words
A wave absorber as in claim 1 wherein said absorber has a semispherical shape.
Claim 12
Dependent Claim
19 words
The wave absorber as in claim 1 wherein said absorber is in the form of a plurality of semispheres.
References Cited (Backward Citations)
US2292444A
Cited
US3315260A
Cited
US3038551A
Cited
US3526896A
Cited
US3307186A
Cited
US3568196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |