  Microwave Kinetic Inductance Detector (MKID) arrays are currently being
developed and deployed for astronomical applications in the visible and near
infrared and for sub-millimetre astronomy. One of the main drawbacks of MKIDs
is that large arrays would exhibit a pixel yield, the percentage of
individually distinguishable pixels to the total number of pixels, of 75 - 80
%. Imperfections arising during the fabrication can induce an uncontrolled
shift in the resonance frequency of individual resonators which can end up
resonating at the same frequency of a different resonator. This makes a number
of resonators indistinguishable and therefore unusable for imaging. This paper
proposes an approach to individually re-tune the colliding resonators in order
to remove the degeneracy and increase the number of MKIDs with unique resonant
frequencies. The frequency re-tuning is achieved through a DC bias of the
resonator, the kinetic inductance of a superconducting thin film is current
dependent and its dependence is non linear. Even though this approach has been
already proposed, an innovative pixel design, described in this paper, may
solve two issues previously described in literature such as increased
electromagnetic losses to the DC-bias line, and the multiplexibility of
multiple resonators on a single feedline.
