Patent ID: 6784670
Filing Date: 2004-08-31
Classification: G01R,H01P

Abstract:
An anechoic chamber for making transmission measurements of electromagnetic devices comprising:a tapered first chamber having first and second ends the first end being open and the second end having a first aperture; a tapered second chamber having first and second ends, the second end having a second aperture, wherein the second chamber is separated from the first chamber by an adjustable separation distance d such that the first and second apertures are opposed; an unenclosed testing region located outside of the first and second chambers and in between the first and second agertures, the testing region having an adjustable area controlled by the separation distance d between the first and second chambers; an alignment apparatus coupled to the first and second chambers for controlling the separation distance d between the chambers, for controlling the size of the area of the testing region, and for positioning the electromagnetic device between the apertures; a transmitter antenna disposed within the first chamber for transmitting a test signal; a positioning mechanism connected to the exterior of the first end of the first chamber for varying the position of the transmitter antenna along a line orthogonal to the plane defined by the first end of the first chamber; and a receiver antenna disposed within the second chamber for receiving the test signal.