DC to 40 GHz coaxial-to-microstrip transition for 100- mu m-thick GaAs substrates

The design, design approach, and test results are presented for a simple coaxial-to-microstrip transition. The approach provides improved performance over the basic coaxial-to-microstrip transition by causing a TEM-to-quasi-TEM transformation through a tapering of the coaxial line for 432+or-51 mu m ( >