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This paper deals with special HPEM sources and their effects on wireless communication systems operating inside the 2.4 GHz ISM band. Different measurements have been performed to investigate the effect of UWB and radar pulses on the receiver of a digital wireless communication system. First the coupling of UWB and radar pulses into a typical bar antenna usable for the 2.4 GHz ISM band has been measured. Based on the coupling measurements the effects in the baseband of a typical wireless receiver is being investigated for different radar and UWB pulses. Finally a worst-case analysis by using a HF switch is being investigated for a WLAN and Bluetooth system. The results show how possible interferences with different interference durations and interference repetition rates can cause effects on the performance of a wireless communication system.