  The IceCube neutrino detector is built into the Antarctic ice sheet at the
South Pole to measure high energy neutrinos. For this, 4800 photomultiplier
tubes (PMTs) are being deployed at depths between 1450 and 2450 meters into the
ice to measure neutrino induced charged particles like muons. IceTop is a
surface air shower detector consisting of 160 Cherenkov ice tanks located on
top of IceCube. To extend IceTop, a radio air shower detector could be built to
significantly increase the sensitivity at higher shower energies and for
inclined showers. As air showers induced by cosmic rays are a major part of the
muonic background in IceCube, IceTop is not only an air shower detector, but
also a veto to reduce the background in IceCube. Air showers are detectable by
radio signals with a radio surface detector. The major emission process is the
coherent synchrotron radiation emitted by e+ e- shower particles in the Earths
magnetic field (geosynchrotron effect). Simulations of the expected radio
signals of air showers are shown. The sensitivity and the energy threshold of
different antenna field configurations are estimated.
