RECEIVED MICROWAVE-POWER IN FREQUENCY-LOCKED JOSEPHSON-JUNCTION ARRAYS

Experimental studies of the received 22 GHz power in two different typ es of Josephson junction arrays with two different numbers of Josephso n junctions have been performed by measuring the Josephson self-radiat ion power and the Shapiro-steps. The serial-parallel and the parallel Josephson junction arrays were prepared with and without an additional inductive coupling line. The self-radiation properties of the serial- parallel array had good quality frequency locking and exactly satisfie d the Josephson voltage-frequency relationship. For the array of 7 Jos ephson junctions, the detected power of Josephson self-radiation from the serial-parallel array was about 1000 times higher than that from t he parallel array. Also, for an irradiation power of 10 mW and 22 GHz, the received power in the serial-parallel array was about one order o f magnitude higher than that in the parallel array. in the serial-para llel array, for the same irradiation power, the received power of the array with 9 Josephson junctions was higher than that of the array wit h 7. The received microwave power in a Josephson junction array is str ongly influenced by the impedance and by the type of array.