| 摘要 |
PURPOSE: To couple a circuit at ambient temperature to a superconducting circuit of low temperature, without almost accompanying thermal conduction by disposing a microwave probe head at a suitable interval above both ends of a board, so that a probing pin is disposed on an electroconductive ground plane and superconducting center line. CONSTITUTION: This capacitive coupling structure is provided with a superconducting waveguide 5 coupled to a superconducting element 1 on a board 4, extended to one end of the board 4 and formed of an oxide superconductor for transmitting a microwave to the element 1, a pair of superconducting ground planes 6 of oxide superconductors sandwiching the end of the waveguide 5 at a small interval, and three probing pins 31, 32, 33 corresponding to the waveguide 5 and plane 6. Microwave probe heads 21, 22 connected to the circuit of the ambient temperature and having a small gap are disposed on the waveguide 5. Therefore, microwave is efficiently transmitted from the pins to the waveguide.
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