What type of waveguide joint is achieved by terminating each section of guide with flat plates?

The ideal choice for this question is associated with the termination of waveguide sections using flat plates. A flange joint is a specific type of connection used to join two waveguides or sections of waveguide together. By effectively terminating each section of the waveguide with flat plates, the physical and electromagnetic continuity is maintained, ensuring efficient transmission of signals with minimal loss or reflection at the connection point.

Flange joints are designed to ensure ease of assembly and disassembly, while also providing a reliable seal against environmental factors. The flat surfaces align perfectly, facilitating a robust integration of the waveguide sections. This characteristic is what makes flange joints particularly suitable for applications in pulse radar systems, where precision and performance are critical.

Other types of joints mentioned in the options relate to different mechanical functions or configurations that do not specifically utilize flat plates for joining waveguide sections in the same manner as flange joints do.