Multichannel Transmitting System Based on High-Temperature Superconducting Phase Shifter
IEEE Transactions on Applied Superconductivity(2020)
Abstract
Multichannel very high frequency (VHF) high-power transmission system, based on a 90
°
, high-temperature superconductor YBa
2
Cu
3
O
7
(YBCO) hybrid coupler is presented. The small dimension coupler performs as a phase shifter utilized for matching several different channels into a single junction. The planar coupler was implemented in a microstrip geometry by patterning a thin layer of YBCO on a sapphire substrate. Superconductivity is essential for obtaining low losses and high-power capabilities. The system was tested for power transmission of up to 52.9 dBm over a period of several hours. No deterioration with time was recorded. Maximum losses of 0.8 dB per channel were measured. The proposed system shows high-precision tuning capabilities, a critical feature for multichannel systems.
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Key words
Communication systems,high power trans-mission,high-temperature superconductors (HTSC),microstrip directional couplers,software-define radio (SDR),superconducting devices,VHF band
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