TY  - RPRT
TI  - Calculated and measured S₁₁, S₂₁, and group delay for simple types of coaxial and rectangular waveguide 2-port standards 
AU  - Beatty, Robert William
PY  - 1974
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS TN 657
DO  - 10.6028/NBS.TN.657
ER  -