Citation
Abstract
A thick dichroic plate acts as a frequency selective surface (FSS) in that it is transparent at one frequency while at the same time reflective to other frequencies. It is used in the DSN to enable simultaneous multiple-frequency operation. Most of the plates currently in use were designed with programs that analyzed only the simple geometries, such as circular or rectangular holes. Since it is too expensive to experimentally determine the FSS parameters, only designs that could be accurately analyzed were chosen, and it is the primary reason why the recent FSS designs use rectangular holes. To achieve the sharp corners of the rectangular holes, it was necessary to use an electrical discharge machining (EDM) manufacturing technique. This manufacturing technique is expensive, and an important use of the arbitraryshaped analysis is to enable designs that use rounded corners that are able to be manufactured by less expensive techniques. The analysis is accomplished by combining the finite-element method (FEM) for determining the waveguide modes of arbitrarily shaped guides with the method of moments and Floquet mode theory for periodic structures. The software was verified by comparison with previously measured and computed dichroic plates.
Keywords
Details
- Volume
- 42-146
- Published
- August 15, 2001
- Pages
- 1–21
- File Size
- 308.8 KB