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The corrugated horn is a high performance feed often used in radiotelescopes. There has been a growing demand for wideband optics and corrugatedhorns in millimeter and submillimeter-wave receivers. It improves theobservation efficiency and allows us to observe important emission lines suchas CO in multiple excited states simultaneously. However, in themillimeter/submillimeter band, it has been challenging to create a conicalcorrugated horn with a fractional bandwidth of ~60% because the wavelength isvery short, making it difficult to make narrow corrugations. In this study, wedesigned a conical corrugated horn with good return loss, lowcross-polarization, and symmetric beam pattern in the 210-375GHz band (56%fractional bandwidth) by optimizing the dimensions of the corrugations. Thecorrugated horn was installed on the Osaka 1.85-m mm-submm telescope with thematched frequency-independent optics, and simultaneous observations of 12CO,13CO, and C18O (J = 2-1, 3-2) were successfully made. In this paper, wedescribe the new design of the corrugated horn and report the performanceevaluation results including the optics.

publications of the astronomical society of japan

Development of a new wideband heterodyne receiver system for the Osaka  1.85-m mm-submm telescope -- Corrugated horn & Optics covering 210-375 GHz  band