Aims. We describe the design, construction, and characterization of the Band 9 heterodyne
receivers (600–720 GHz) for the Atacama Large Millimeter/submillimeter Array (ALMA). First …

This paper reports on a turnstile-junction orthomode transducer (OMT) implemented by
silicon micromachining in the 220-330-GHz band. Turnstile OMTs are very wideband and …

We have developed a dual-polarization receiver for Band 4 of the Atacama Large Millimeter/
submillimeter Array (ALMA). Band 4, which covers the 125 to 163 GHz spectral window, is …

We present design and evaluations of a submillimeter double-ridged waveguide ortho-mode
transducer (OMT) for ALMA Band 8 (385–500 GHz) cartridge receiver. The measured …

We have developed a cartridge-type receiver covering the frequency band of 385-500 GHz
as a qualification model of Atacama Large Millimeter/submillimeter Array (ALMA) band 8. It …

The ALMA Band 10 (787–950GHz) receiver is a dual-polarization heterodyne system based
on NbTiN superconducting technology. The coupling of energy from the secondary mirror of …

We present a fundamental and accurate approach to compute the attenuation of
electromagnetic waves propagating in rectangular waveguides with finite conductivity walls …

We have developed a near-field vector beam measurement system covering the range of
frequencies from 385 to 500 GHz. The measurement set-up is capable of measurements …

We present the design, implementation, and characterization of the optics of ALMA Band 1,
the lowest frequency band in the most advanced radio astronomical telescope. Band 1 …

The latest generation of Cassegrain radio astronomy antennas is designed for multiple
frequency bands with receivers for individual bands offset from the antenna axis. The offset …