  We present radio maps of the historical supernova remnant G11.2-0.3 in the
frequency range from 4.85 GHz to 32 GHz. The integrated spectrum with \alpha =
-0.50 (S ~ \nu^\alpha) is dominated by its steep spectrum shell emission
(\alpha ~ -0.57), although a flat spectrum core structure classifies G11.2-0.3
as a composite supernova remnant. A radial magnetic field structure is
observed. An analysis of the multi-frequency polarization data results in
highly varying rotation measures along the shell. The percentage polarization
is rather low (~2%) and we conclude that G11.2-0.3 is in the transient phase
from free to adiabatic expansion. The central flat spectrum component is partly
resolved. A compact radio source with an inverted spectrum likely coincides
with the previously detected X-ray pulsar (Torii et al. (1997). Two symmetric
structures with flat radio spectra possibly indicate a bipolar outflow.
Combining available X-ray and radio data we conclude that G11.2-0.3 is likely
the remnant of a type II supernova explosion with an early type B progenitor
star.
