Experimental Verification and Imaging of Radiation Due to Coaxial-to-Microstrip Transitions

This paper presents the experimental verification, imaging and animation of the radiation and coupling generated due to a coaxial-to-microstrip transition using electro-optic based measurements. The measured and simulated scattering parameters of a 50-Ω microstrip transmission line accessed with two SMA microwave end launch connectors are presented. An electro-optic based system and a vector network analyzer are integrated to measure the normal electric field component of the device at multiple frequencies up to 10 GHz. The measurements capture the radiation due to the coaxial-to-microstrip transition. Finite-element-method (FEM) based electric field simulations show a very good agreement with the measured results.