We investigate the influence of high frequency microwave radiation on single electron tunneling through a quantum dot. Effective coupling of the radiation to the quantum dot is achieved by an on‐chip integrated broadband antenna. Simulations of the current distribution on the antenna are shown. We find that radiation with a frequency of &ngr;=155 GHz, which corresponds to half of the bare charging energyEc/2 results in an additional conductance peak within the Coulomb blockade regime. This additional resonance is attributed to photon‐assisted tunneling. ©1995 American Institute of Physics.