Design and verification of a novel crossed dipole structure for quasi-optical frequency doublers

A novel structure suitable for quasi-optical frequency doublers is presented. It is based on the crossed dipole structure, but uses four diodes in a bridge configuration to form a balanced multiplier layout and incorporates the necessary dc path in a simple way within the structure. The entire structure is analyzed using the lumped element (LE)-FDTD method. To allow a comparison of the results, the concept of quasi-optical effective aperture is introduced. Simulated as well as measured quasi-optical results are presented and a good agreement is achieved.