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Chinese Science Bulletin (Chinese Version)

Test and analysis of bicrystal Josephson junction mixer’s conversion efficiency

MengYue LI, Jian Chen, Tao Hua, Jian Wei Yang, Weiwei Xu, ZhengMing amp WU PeiHeng JI, 培亨 吴

Published Jul 1, 2009• 0 citations
Publisher

Abstract

The research work on the conversion efficiency of high-temperature superconductivity bicrystal Josephson junction mixer is reported. Using ion etching, the junction integrated with antenna is prepared. Experiment on harmonic mixing at 3 mm waveband is carried out. The relationship between conversion efficiency and the parameters of local oscillation power, microwave signal power, harmonic order, bias electric current, etc., is tested and analyzed.

DOI
10.1360/972008-1968

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IEEE Transactions on Magnetics•Nov 1, 1993•4 citations
The research work on the conversion efficiency of high-temperature superconductivity bicrystal Josephson junction mixer is reported. Using ion etching, the junction integrated with antenna is prepared. Experiment on harmonic mixing at 3 mm waveband is carried out. The relationship between conversion efficiency and the parameters of local oscillation power, microwave signal power, harmonic order, bias electric current, etc., is tested and analyzed.
Using a high Tc superconducting grain boundary Josephson junction, harmonic mixing experiments in the mm waveband were carried out, aiming at as large a harmonic number and as high a signal frequency as possible. The dependencies of intermediate frequency output on dc bias, harmonic number, frequency of local oscillator (LO), and other parameters were carefully studied. Until now, our best result was the mixing between the signal at 95 GHz and the 105th harmonic of LO at about 900 MHz. Preliminary experiments using a high Tc harmonic mixer and phase-locking loop were tried to stabilize the frequency of a mm wave source.
This paper presents theoretical analysis and modeling of YBaCuO superconducting Josephson mixer for terahertz frequency band. The study was carried out both for the mixing at the first harmonic and for the case of high harmonic mixing. The numerical solution based on resistively shunted junction model was obtained for the YBaCuO junction with typical experimental parameters. Optimizing mixer performance included choosing the proper operating point and the local oscillator power. A study on the effect of RF input power, frequency and the harmonic number on conversion efficiency was carried out. The theoretical predictions presented in the work provide a simple method for optimal control of the Josephson mixer and demonstrate good qualitative agreement with direct modeling. For the first time, the optimum of the conversion efficiency versus signal frequency was analytically obtained.
The high-Tcsuperconducting (HTS) bicrystal YBa2Cu3O7-δ(YBCO) zero-bias-operation Josephson junction (JJ) harmonic mixer coupled with a bowtie loaded meander antenna (BLMA) is proposed and studied at 0.21 THz. When the JJ mixer coupled with the BLMA, the maximal harmonic number increases up to 146 with the conversion efficiency of -63.6 dB at the bath temperature around 4.6 K compared to a mixer coupled with a log-periodic antenna (LPA) of only a maximal harmonic number of 46 with the conversion efficiency of -71.6 dB. The mixer coupled with the BLMA has a higher order harmonic mixing with a lower local oscillator (LO) power of 1.26 dBm, which further illustrates its superiority to that coupled with a LPA with the LO power of 5.59 dBm. The experiment verifies the merits of the JJ harmonic mixer operating at zero bias as a promising device in terahertz regions.
A microwave mixer was patterned on a microstrip transmission line of superconducting YBCO (YBa/sub 2/Cu/sub 3/O/sub 7-x/). The YBCO film was epitaxially laser deposited on a SrTiO/sub 3/ bicrystal substrate. A weak link was constructed by patterning a microbridge in the microstrip at the bicrystal boundary. Microwave signals at 9.000 GHz and 9.941 GHz were applied at the input of the microstrip line. An output intermediate frequency signal was observed at 941 MHz and was detected as the transmitted signal. The microbridge junction, which behaved as a resistively shunted Josephson junction (RSJ), was current biased slightly above the critical current I/sub c/. The mixer conversion loss was measured at the input and output ports of the device package. The mixing efficiency was determined at the device junction. This efficiency was compared with the calculated efficiency determined by numerical solution of the Josephson equation for the weak link junction.>