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We present radio maps of the historical supernova remnant G11.2-0.3 in thefrequency 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 G11.2-0.3as a composite supernova remnant. A radial magnetic field structure isobserved. An analysis of the multi-frequency polarization data results inhighly varying rotation measures along the shell. The percentage polarizationis rather low (~2%) and we conclude that G11.2-0.3 is in the transient phasefrom free to adiabatic expansion. The central flat spectrum component is partlyresolved. A compact radio source with an inverted spectrum likely coincideswith the previously detected X-ray pulsar (Torii et al. (1997). Two symmetricstructures with flat radio spectra possibly indicate a bipolar outflow.Combining available X-ray and radio data we conclude that G11.2-0.3 is likelythe remnant of a type II supernova explosion with an early type B progenitorstar.Comment: 9 pages with 10 figures, A&A, in pres

A high frequency radio study of G11.2-0.3, a historical supernova remnant with a flat spectrum core