Microwave detectors based on granular high-Tc thin films

J. Konopka, R. Sobolewski, G. Jung, W. Kula, A. Konopka, P. Gierlowski, J. Lewandowski

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


The detection and mixing properties of microstrip superconducting YBCO and BCSCO granular thin-film structures were investigated. The microstrips were deposited on various substrates by two different techniques. Device performance was tested in 25-, 55-, and 110-GHz bands at temperatures ranging from 50 to 80 K. Detector response was bias and temperature dependent. The mixing experiments were performed in the 25-GHz frequency band. The intermediate frequency was varied from 50 MHz to 5 GHz without any decrease in the mixer output up to 3 GHz. YBCO and BCSCO thin-film devices are operational in the temperature range from Tc-10 K to about 50 K. The lower limit is imposed by quantum effects which render erratic the output signal. Although the mechanism responsible for the detection has not been positively identified, the auxiliary emission measurements performed at 12 GHz and down to 4.2 K revealed that the low-temperature performance limit is associated with Josephson radiation from weak-link clusters composed of multiloop quantum interferometers.

Original languageEnglish
Pages (from-to)635-638
Number of pages4
JournalIEEE MTT-S International Microwave Symposium Digest
StatePublished - 1 Dec 1989
Externally publishedYes
EventIEEE MTT-S International Microwave Symposium Digest 1989 - Long Beach, CA, USA
Duration: 13 Jun 198915 Jun 1989


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