210–365 GHz 90° Differential Phase Shifter for Wideband Circular Polarizer

Development of a wideband multi-channel receiver for simultaneous observations in 230 and 345 GHz bands with dual-polarization

“…Then, we succeeded in preliminary simultaneous observations in 230 and 345 GHz bands with single-polarization [2]. We are currently working on improving the multiplexer and developing a 90° differential phase shifter [3] and a wideband orthomode transducer (OMT). The 90° differential phase shifter and OMT can be combined to operate as a circular polarizer (CP) as shown in Figure 1 (b), which will contribute to observations of both circularly and linearly polarized waves by using the OMT and CP, respectively.…”