Quasioptical Hilbert transform spectrometer

Author

Tarasov, M.A. ; Shul´man, A.Ya. ; Prokopenko, Georgy V. ; Koshelets, V.P. ; Polyanski, O.Yu. ; Lapitskaya, I.L. ; Vystavkin, A.N. ; Kosarev, E.L.

Author_Institution

Inst. of Radio Eng. & Electron., Acad. of Sci., Moscow, Russia

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

2686

Lastpage

2689

Abstract

A quasioptical spectrometer using Hilbert transformation of Josephson junction response has been designed, fabricated and experimentally studied. Resistively shunted SIS junctions have been used as the Josephson sensor placed in the centre of a complementary logarithmic spiral antenna. The response was studied in the 75-150 GHz frequency band. A resolution below 1 GHz and noise equivalent power about 10/sup -13/-10/sup -14/ W has been measured for the 0.7 /spl Omega/ junction. The measured spectrum is obtained by means of Hilbert transformation via a novel deconvolution program based on the maximum likelihood approach. This allows one to diminish the measured interval of bias voltage and avoid measurements of the noisy part of the response curve without loss of the spectral resolution.<>

Keywords

Hilbert transforms; maximum likelihood detection; microwave spectrometers; millimetre wave spectroscopy; superconducting device noise; superconducting microwave devices; superconductor-insulator-superconductor devices; 0.7 ohm; 75 to 150 GHz; Hilbert transformation; Josephson sensor; complementary logarithmic spiral antenna; deconvolution; maximum likelihood; noise equivalent power; quasioptical spectrometer; resistively shunted SIS junction; spectral resolution; Antenna measurements; Deconvolution; Frequency; Josephson junctions; Loss measurement; Noise measurement; Power measurement; Spectroscopy; Spirals; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403144

Filename

403144