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We have developed Lumped Element Kinetic Inductance Detectors (LEKID)sensitive in the frequency band from 80 to 120~GHz. In this work, we takeadvantage of the so-called proximity effect to reduce the superconducting gapof Aluminium, otherwise strongly suppressing the LEKID response for frequenciessmaller than 100~GHz. We have designed, produced and optically tested variousfully multiplexed arrays based on multi-layers combinations of Aluminium (Al)and Titanium (Ti). Their sensitivities have been measured using a dedicatedclosed-circle 100 mK dilution cryostat and a sky simulator allowing toreproduce realistic observation conditions. The spectral response has beencharacterised with a Martin-Puplett interferometer up to THz frequencies, andwith a resolution of 3~GHz. We demonstrate that Ti-Al LEKID can reach anoptical sensitivity of about $1.4$ $10^{-17}$~$W/Hz^{0.5}$ (best pixel), or$2.2$ $10^{-17}$~$W/Hz^{0.5}$ when averaged over the whole array. The opticalbackground was set to roughly 0.4~pW per pixel, typical for future spaceobservatories in this particular band. The performance is close to asensitivity of twice the CMB photon noise limit at 100~GHz which drove thedesign of the Planck HFI instrument. This figure remains the baseline for thenext generation of millimetre-wave space satellites.

Bi-layer Kinetic Inductance Detectors for space observations between 80-120 GHz