Superconducting Microstrip-Fed Antenna; Coupled to a Microwave Kinetic Inductance Detector

A proper antenna to couple to a microstrip microwave kinetic inductance detector (mkid) is designed and simulated. a twinslot microstrip-fed inline antenna is designed for frequency band of 600- 720~ghz integrated with an elliptical lens and coupled to the mkid. a systematic design procedure for design of such antenna with microstrip inline feeding is presented. whole structure of lens and twin slot is simulated by full-wave electromagnetic numerical software. a locally changing technique is also used to have good matching between antenna and feed line. results show good radiation pattern with directivity near 30db and side lobe levels better than -10.5 db in both h-plane and eplan and also antenna efficiency is better than 93% and total coupling efficiency is better than 84% in whole frequency band. this antenna is recently used in a superconducting on-chip sub-millimeter wave filterbank spectrometer.