Microwave Characteristics of Microwave Kinetic Inductance Detectors Using Rewound Spiral Resonators Array

We investigated microwave characteristics of microwave kinetic inductance detectors (MKIDs) using rewound spiral resonators called as spiral-MKIDs. To realize 25-array spiral-MKIDs, frequency characteristics of 25 resonators with different resonant frequencies should be equal. We proposed spiral-MKIDs with expanded and contracted symmetric spiral resonator. We conducted simulations for 25 arrays and obtained maximum return losses of over 12 dB and unloaded quality factors of over 230,000 for frequencies between 3.2 and 3.4 GHz. This symmetric resonator may be useful for realization of large array MKIDs.