Waveguide to Coaxial Adapter 33-50GHz Frequency Range RM-WCA22

A waveguide-to-coaxial adapter is a critical passive microwave component designed for efficient signal transition and transmission between a rectangular/circular waveguide and a coaxial transmission line. It is not an antenna itself, but an essential interconnection component within antenna systems, particularly those fed by waveguides.

Its typical structure involves extending the inner conductor of the coaxial line a short distance (forming a probe) perpendicularly into the broad wall of the waveguide. This probe acts as a radiating element, exciting the desired electromagnetic field mode (typically the TE10 mode) inside the waveguide. Through precise design of the probe’s insertion depth, position, and end structure, impedance matching between the waveguide and coaxial line is achieved, minimizing signal reflection.

The key advantages of this component are its ability to provide a low-loss, high-power-capacity connection, combining the convenience of coaxial equipment with the low-loss benefits of waveguides. Its main drawback is that its operational bandwidth is limited by the matching structure and is generally narrower than that of broadband coaxial lines. It is widely used to connect microwave signal sources, measurement instruments, and waveguide-based antenna systems.