Effects of split gap on the microwave properties of YBCO microstrip ring resonator

Recently, we have succeeded in fabricating HTS ring resonators by using the double-side YBCO films deposited on LaAlO3 (LAO) substrates. Quality facto r (Q) over 10(4) at 5 K with resonating frequency of 3.61 GHz has been demo nstrated. Furthermore, by creating a narrow gap in the same ring structure, we found that the resonating frequency splits into two, one occurred at ha lf and three halves of the original one (i.e. at 1.80 GHz and 5.33 GHz, res pectively). The temperature dependence of the resonating frequency and Q-va lue were studied in detail. We found that although the resonating frequency changes by introducing the gap, the Q-value remains essentially unchanged.