Waveguide structure design for a sideband-separating heterodyne receiver operating in the 0.8…1 mm wavelength band

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Abstract

A waveguide structure is presented for the RF front end of a sideband-separating heterodyne receiver operating in the 0.8–1 mm band, based on two single-ended superconductor–insulator–superconductor (SIS) mixers. The microwave properties of the following elements are investigated: a 90° quadrature hybrid, a directional coupler, a T-junction power divider, and a transition section; their amplitude and phase frequency responses are calculated. For the 90° hybrid, the amplitude imbalance does not exceed 1.5 dB, the phase imbalance including reflections stays within 2°, and both return loss and isolation are better than –25 dB. In addition, a full waveguide assembly was simulated with the SIS-mixer reflections taken into account. The resulting sideband rejection of the entire waveguide structure, including mixer reflections, is no worse than 20 dB across the band.

About the authors

G. P Nazarov

Kotelnikov Institute of Radioengineering and Electronics RAS; Astrospace Center of the P.N. Lebedev Physical Institute RAS

Email: nazarov.gr@asc.rssi.ru
Moscow, Russian Federation; Moscow, Russian Federation

K. I Rudakov

Astrospace Center of the P.N. Lebedev Physical Institute RAS

Moscow, Russian Federation

I. V Tretyakov

Astrospace Center of the P.N. Lebedev Physical Institute RAS

Moscow, Russian Federation

Ya. O Vodzianovskiy

Astrospace Center of the P.N. Lebedev Physical Institute RAS

Moscow, Russian Federation

A. V Khudchenko

Astrospace Center of the P.N. Lebedev Physical Institute RAS

Moscow, Russian Federation

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