A 660 GHz Local Oscillator Subsystem: Design, Testing and Alignment

Details A 660 GHz Local Oscillator Subsystem: Design, Testing and Alignment A 660 GHz Local Oscillator Subsystem: Design, Testing and Alignment

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eumw.conf..834c&link_type=abstract

Conference proceedings of the 39th European Microwave Conference, 29 September - 1 October, 2009, Rome, Italy, p. 834-837

Computer Science

1

Scientific paper

A 660 GHz local oscillator (LO) sub-system for the Submillimeter Array is designed, tested and aligned in the laboratory by optical and radio alignment. The LO unit employs a cascade tuneless frequency doubler-tripler based on the planar GaAs Schottky diode technology. It is found that a phase shifter inserted between the first and second multiplier stages can improve the frequency response of the unit, reduce the ripples due to the impedance mismatch between the 2 stages. A new technique for the optical and radio alignment of the beam emerging from the unit is also introduced. A near-field scanner which measures the complex beam pattern facilitates the final alignment and helps to verify proper focusing of the LO output beam.

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