Resonant cavities as microwave circuit elements

The following sections are included: impedance functions of lossless lumped circuits; impedance functions of lossless distributed circuits; impedance-function synthesis of a short-circuited lossless transmission line; Foster's theorem for slightly lossy networks; the impedance functions of simple series- and parallel-resonant circuits; the equivalent circuit of a loop-coupled cavity; impedance functions near resonance; coupling coefficients and external loading; general formulas for Q factors; iris-coupled, short-circuited waveguide; general representation of lossless two-terminal-pair networks; introduction of loss; representation of a cavity with two loop-coupled lines; and transmission through a two-line cavity-coupling system.