Microwave polarizer

Details Microwave polarizer Microwave polarizer

H - Electricity

01

P

333/16

H01P 1/16 (2006.01) H01P 1/17 (2006.01)

Patent

CA 1142610

-27- ABSTRACT OF THE DISCLOSURE This specification discloses a microwave circular polarizer for converting a linearly pol rized microwave signal to a circularly polarized microwave signal and vice versa. A transducer, such as an orthomode junction is used to obtain a power split or a power recombination of two orthogonal linear polarizations. To obtain the phase de- lay required to generate a circularly polarized signal from two linearly polarized signals, the polarizer includes a phase compensator with a pair of waveguides which have appro- priate width and length so that signals passing therethrough develop a phase difference therebetween and a composite circularly polarized signal results. The amount of phase shift occurring in each of the waveguides varies with the frequency of the signal in such a way as to produce a high purity circular polarization over a broad frequency band. A phase shift of 90° can be obtained at two frequencies and these frequencies can be selected so that they are within a frequency band having a desirably low axial ratio.

332617

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