The design and performance of transverse-film bolometers in rectangular waveguides

Equations are derived which determine the design of film-type bolometers used for the measurement of microwave power. The results are discussed in relation to the concept of impedance in rectangular waveguides. Measurements on an improved tunable-type instrument at a wavelength of 3cm indicate that power levels between 1 and 100mW can be measured in terms of a d.c. calibration with an error of not more than ±2%.