Microwave Couplers: Directivity and Reflectometry

This lecture covers the directivity as a measure of quality in microwave couplers, including microstrip hybrid couplers and multihole waveguide couplers. Reflectometry with one or two couplers for precision measurements is explained, along with the importance of coupling and isolation in coupler quality assessment. The lecture also delves into 1 and 2 coupler reflectometry, discussing the error terms and quality indicators. Additionally, it explores the use of adapters in 2 coupler reflectometry and the principles of network analyzers. Transmission measurements, attenuation, and the effects of mismatch between source and load are also detailed, with practical examples provided.