Broadband waveguide-to-coax transitions

This paper describes three transitions from waveguide to coaxial line, each of which cover a frequency band of more than 30%. These include: 1. A colinear end-on transition from RG 48/U waveguide (3" x 1-1/2" o.d.) to standard 50 ohm 7/8" coaxial line. VSWR<1.10 from 2600 to 3700 mc. 2. A colinear end-on transition from 2.840" x 0.875" i.d. waveguide to standard 50 ohm 7/8" coaxial line. VSWR<1.1O from 2600 to 3700 mc. 3. A transition from WR 159 to 50 ohm coaxial line with a VSWR<1.14 from 4800 to 6500 mc. This is a "normal" transition in that the coaxial line feeds into the center of the broad face of the waveguide.