![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
In this paper, improved three dimensional long transmission line-frequency domain (LTL-FD) circuits are used to determine cutoff wavenumbers of microwave resonators. The II-form of long transmission line representation [1] is used to construct the model. Consequently, treatment of boundaries and interfaces between different media is shown to be a simple procedure. The resonance frequencies of the resulting circuits are the required cutoff frequencies of the resonator. The problem is reduced to an eigenvalue problem, which gives the required solution. The models ensure the satisfaction of field divergence equations and, so, results are free from spurious modes. Results for homogeneous cavities and partially dielectric-filled cavities are given and are compared with available analytical solutions as well as those given by other methods.