Radio frequency lens and method of suppressing side-lobes
US7777690B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 2007 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Feb 27, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q19/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An RF lens according to the present invention embodiments collimates an RF beam by refracting the beam into a beam profile that is diffraction-limited. The lens is constructed of a lightweight mechanical arrangement of two or more materials, where the materials are arranged to form a photonic crystal structure (e.g., a series of holes defined within a parent material). The lens includes impedance matching layers, while an absorptive or apodizing mask is applied to the lens to create a specific energy profile across the lens. The impedance matching layers and apodizing mask similarly include a photonic crystal structure. The energy profile function across the lens aperture is continuous, while the derivatives of the energy distribution function are similarly continuous. This lens arrangement produces a substantial reduction in the amount of energy that is transmitted in the side-lobes of an RF system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.