Contiguous filterbank receiver for a pulsed 140 GHz gyrotron

A double conversion receiver with center frequency of 140 GHz and 18 GHz bandwidth is presented. A spectral resolution of up to 100 MHz is achieved by use of a contiguous filterbank. Thus, real time spectral analysis of 100 MHz resolution is possible. It is planned to use the device to monitor mode competition of the 500 kW 140 GHz TE10,4 gyrotron, which is currently under test at KfK (Kernforschungszentrum Karlsruhe).