Double-/triple-bands Simultaneous Observation System with Perforated Dichroic Filter Plates Equipped for the Nobeyama 45 m Radio Telescope

This paper introduces the Hybrid Integration Project in Nobeyama, Triple-band Oriented (HINOTORI) promoted with the 45 m telescope of Nobeyama Radio Observatory. The key development of the project was perforated dichroic filter plates installed in the quasi-optics of the telescope, enabling us to simultaneously observe in dual (22 and 43 GHz) and triple (22, 43, and 86 GHz) bands. HINOTORI has also upgraded the backend system for very long baseline interferometry (VLBI), enabling us to conduct three-millimeter VLBI observations in longer coherent data integration. This paper presents the specifications and the performance of the whole HINOTORI system including the filter plates that has been tested.