We consider the case of electromagnetic field inside a rectangular cavity with conducting walls as form system described by classical mechanics equations. pass these equations through Lagrangian formalism to obtain Hamiltonian formulation. Finally we apply canonical quantization end up quantum theory field. Since electrodynamics can be interpreted one photon system, then above is taken “quant...

The accuracy of an amendment theory on the cavity perturbation technique for microwave dielectric properties measurements has been studied. The accuracy was confirmed by comparisons of experimental results with those measured by another well known measurement method – post resonance technique. Based on the conventional circular aperture coupling structure, a new equation is proposed to determin...

In this article, we present a substrate-integrated waveguide-based band-pass filter with wide stop-band rejection property. This band-pass filter is made up of two substrate-integrated waveguide cavities, which couple to each other by an aperture on their common waveguide side wall. By using the empirical formula [19] for obtaining the equivalent rectangular waveguide dimensions, the substrate ...