The book contains: Wave-guides & Resonators: Introduction Microwave spectrum and bands applications of Microwaves Rectangular Wave-guides-Solution of Wave Equation in Rectangular Coordinates TE/ TM mode analysis Expressions for fields Cutoff frequencies filter characteristics dominant and degenerate modes sketches of TE and TM mode fields in the cross-section Mode characteristics - Phase and Group velocities wavelengths and impedance relations Rectangular Wave-guides – Power Transmission and Power Losses Impossibility of TEM Modes Micro strip Lines-Introduction Z0 Relations losses Q-factor Cavity resonators-introduction Rectangular and cylindrical cavities dominant modes and resonant frequencies Q-factor and coupling coefficients illustrative problems.