Patent ID: 8772687
Filing Date: 2014-07-08
Classification: H05B

Abstract:
1. An observation window for a microwave device exhibiting microwave radiation of a predetermined frequency, the observation window comprising: a first transparent panel having a first major surface and a second major surface opposing said first major surface, said first transparent panel having a first predetermined thickness defining the distance between the first major surface and the second major surface thereof, a second transparent panel having a first major surface and a second major surface opposing said first major surface, said second transparent panel having a second predetermined thickness defining the distance between the first major surface and the second major surface thereof, wherein said second major surface of said first transparent panel abuts said second major surface of second transparent panel such that the first optically transparent conductive film is substantially parallel with the second optically transparent conductive film, and wherein the first predetermined thickness and the second predetermined thickness define a predetermined spatial separation of the first optically transparent conductive film from the second optically transparent conductive film, said predetermined spatial separation defining an interstice, said predetermined spatial separation being equal to an odd integer multiple of one quarter of the wavelength of the microwave radiation of the predetermined frequency in the interstice between said first and second transparent conductive films, said predetermined distance having a tolerance of plus or minus 0.15 of said wavelength in the interstice.