  Recent observations of the microwave sky, by the space telescopes such as
WMAP and Planck, have opened a new window into the analysis of continuum
emission from supernova remnants (SNRs). In this paper, different emission
models that can explain the characteristic shape of presently known integrated
radio/microwave continuum spectrum of the Galactic SNR IC 443 are tested and
discussed. In particular, the possibility that the slight bump in the
integrated continuum of this remnant around 20 -- 70~GHz is genuine and that
can be explained by the contribution of additional emission mechanism such as
of spinning dust is emphasized. We find that adding a spinning dust component
to the emission model improves the fit of the integrated spectrum of this SNR
while, at the same time preserves the physically probable parameter values.
Finally, models that include the high-frequency synchrotron bending of the IC
443 radio to microwave continuum are favored.
