Short wavelength pass filter having a metal mesh on a semiconducting substrate
First Claim
1. A filter which transmits electromagnetic signals in the infrared and/or visible wavelength and which rejects electromagnetic signals in the microwave wavelength, said filter including:
- a. a substrate manufactured from a semiconducting material which transmits infrared and/or visible radiation with minimum absorption, said substrate having a front surface and rear surface; and
b. a conductive metal mesh for rejecting electromagnetic signals in the microwave wavelength said metal mesh being placed in contact with said substrate;
whereby signals in the infrared and/or visible portion of the electromagnetic spectrum pass through said filter with minimum absorption and signals in the microwave portion of the electromagnetic spectrum are rejected.
7 Assignments
0 Petitions
Accused Products
Abstract
A short pass filter is disclosed which exhibits high transmission in the infrared and/or visible region of the electromagnetic spectrum and which has high rejection in the microwave portion of the spectrum. The filter generally consists of a substrate of semiconducting material, for example, n-type germanium which has been doped with a suitable dopant or grown with impurities to provide a substrate with a known conductivity. A metal mesh is placed either on one or on both surfaces of the substrate, or is buried within the substrate. The combination of the semiconducting material and metal mesh produce a filter which will transmit infrared and/or visible radiation while rejecting microwave radiation through absorption and reflection.
69 Citations
9 Claims
-
1. A filter which transmits electromagnetic signals in the infrared and/or visible wavelength and which rejects electromagnetic signals in the microwave wavelength, said filter including:
-
a. a substrate manufactured from a semiconducting material which transmits infrared and/or visible radiation with minimum absorption, said substrate having a front surface and rear surface; and b. a conductive metal mesh for rejecting electromagnetic signals in the microwave wavelength said metal mesh being placed in contact with said substrate; whereby signals in the infrared and/or visible portion of the electromagnetic spectrum pass through said filter with minimum absorption and signals in the microwave portion of the electromagnetic spectrum are rejected. - View Dependent Claims (2, 3, 4)
-
-
5. A filter which transmits signals in the infrared and/or visible portions of the electromagnetic spectrum and which rejects electromagnetic signals of microwave wavelengths, said filter including:
-
a. a substrate manufactured from an electrically insulating material, said substrate having a first and a second side; b. a film manufactured from a semiconducting material which transmits infrared and/or visible radiation with minimum absorption, said film being located on one side of said substrate; and c. a conductive mesh in contact with said substrate for rejecting electromagnetic signals of microwave wavelengths; whereby signals having wavelengths corresponding to the infrared and/or visible portions of the electromagnetic spectrum pass through said filter with minimum absorption and signals having wavelengths corresponding to the microwave portion of the electromagnetic spectrum are rejected.
-
-
6. A filter which transmits signals in the infrared and/or visible wavelength and which rejects electromagnetic signals of microwave wavelengths, said filter including:
-
a. a substrate manufactured from a semiconducting material which transmits infrared and/or visible radiation with minimum absorption, said substrate having a front surface and a rear surface; and b. a metal mesh for rejecting electromagnetic signals of microwave wavelengths, said metal mesh being buried on the front surface of said substrate; whereby signals having wavelengths corresponding to the infrared and/or visible portions of the electromagnetic spectrum pass through said filter with minimum absorption and signals having wavelengths corresponding to the microwave portion of the electromagnetic spectrum are rejected. - View Dependent Claims (7, 8, 9)
-
Specification