End Launch Waveguide to Coaxial Adapter 18-26.5GHz Frequency Range RM-EWCA42

An End-Launch Waveguide to Coaxial Adapter is a specific type of transition designed to achieve a low-reflection connection from the end of a waveguide (as opposed to its broad wall) to a coaxial line. It is primarily used in compact systems requiring an in-line connection along the waveguide’s propagation direction.

Its operating principle typically involves extending the inner conductor of the coaxial line directly into the cavity at the waveguide’s end, forming an effective monopole radiator or probe. Through precise mechanical design, often incorporating stepped or tapered impedance transformers, the characteristic impedance of the coaxial line (typically 50 ohms) is smoothly matched to the wave impedance of the waveguide. This minimizes the Voltage Standing Wave Ratio across the operating band.

The key advantages of this component are its compact connection orientation, ease of integration into system chains, and capability for good high-frequency performance. Its main drawbacks are stringent design and manufacturing tolerance requirements, and a operational bandwidth typically limited by the matching structure. It is commonly found in millimeter-wave systems, test measurement setups, and the feed networks of high-performance radars.