The design of precision standing-wave indicators for measurements in waveguides

The paper is based on the experience of the authors, and deals with both the mechanical and electrical considerations necessary in the design of precision standing-wave indicators of the slotted-section type. Although the note is essentially concerned with standing-wave indicators for rectangular waveguide propagating the H10 mode, many of the remarks will apply equally well to the construction of standing-wave indicators for either circular waveguide or air-filled coaxial line. The laboratory testing of standing-wave indicators is dealt with. A particular standing-wave indicator for work in the 10-cm wavelength band and another for the 3-cm band are described; photographs of them are included.