A Modular Multiplexer Operating Simultaneously in Four Frequency Bands with Two Linear Orthogonal Polarization Each

A multiplexer using quasi-optical filters, directional couplers, Tchebischeff and Butterworth filters and orthomode transducer, can operate simultaneously in four CCIR frequency bands for Microwave links : - One half 3.6 - 4.2 GHz frequency plan for Radio Links carrying 1800 telephone channels - One half 5.925 - 6.425 GHz frequency plan for Radio Links carrying 1800 telephone channels (CCIR Rec. 382.1) - One half 6.43 - 7.11 GHz frequency plan for Radio Links carrying 2700 telephone channels (CCIR Rec. 384.1) - One half 10.7- 11.7 GHz frequency plan for Radio Links carrying 1800 telephone channels (CCIR Rec. 387.1)