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We present a design for an array of kinetic inductance detectors (KIDs)integrated with phased array antennas for imaging at 150 GHz under highbackground conditions. The microstrip geometry KID detectors are projected toachieve photon noise limited sensitivity with larger than 100 pW absorbedoptical power. Both the microstrip KIDs and the antenna feed network make useof a low-loss amorphous silicon dielectric. A new aspect of the antennaimplementation is the use of a NbTiN microstrip feed network to facilitateimpedance matching to the 50 Ohm antenna. The array has 256 pixels on a 6-inchwafer and each pixel has two polarizations with two Al KIDs. The KIDs aredesigned with a half wavelength microstrip transmission line with parallelplate capacitors at the two ends. The resonance frequency range is 400 to 800MHz. The readout feedline is also implemented in microstrip and has animpedance transformer from 50 Ohm to 9 Ohm at its input and output.

A kinetic inductance detectors array design for high background conditions at 150 GHz