Radiation from picosecond photoconductors in microstrip transmission lines.

The signal radiated by the microstrip auto-correlation circuit is experimentally investigated using ion-bombarded InP photoconductors. We present a model as well as empirical results so as to explain how this microstrip circuit can radiatively couple to itself, giving rise to what appears to be a "slow" signal. We demonstrate that by judicious choice of electrode geometry one can separate the sub-picosecond signal which is radiated by the photoconducting gap from the much slower signal which is radiated by the microstrip electrodes.