Tapered anechoic chamber
US6437748B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2000 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Jul 20, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/105
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention includes tapered anechoic chambers and chamber systems. This invention also includes machines or electronic apparatus using these aspects of the invention. The present invention also includes methods and processes for using these devices and systems. In a preferred embodiment, a TEM antenna is utilized that is terminated by a resistive card, or R-card. This makes for a very broadband antenna that may be used to properly illuminate the test zone in a tapered chamber without changing the feed antenna. A preferred chamber utilizes an absorber layout that has never been applied to a tapered chamber, called a Chebyshev absorber layout. The concept is to place the wedge absorber tips at different heights relative to the mounting side wall and pyramidal absorber tips at different heights relative to the back wall. In this pattern, wave reflections off the pyramid tips and valleys behave very much like reflections in a multi-section transmission line. Using this Chebyshev layout around the test zone, the test zone fields will be very clean of stray signals and the polarization will be dictated by the feed horn. Also, it is then not necessary to use very thick absorber…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.