Gradient permittivity film
US11811139B2 · kind B2 · utility
1Cited by
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19Claims
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Key dates
| Filing date | Apr 4, 2019 |
| Grant date | Nov 7, 2023 |
| Priority date | — |
| Expiry date | Apr 20, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/422
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Gradient permittivity films are described. In particular, gradient permittivity films including a plurality of layers each having a thickness where at least one layer is perforated and has a different air volume fraction from another of the plurality of layers by at least 0.05. Such films may be useful in improving the signal to noise ratio for transmitting and receiving units operating between 20 GHz and 300 GHz behind a protective cover.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.