Microwave bandpass filters consisting of rectangular waveguides with 1‐dimensional offsets

Abstract

SUMMARYThe computer-aided analysis and design of direct-coupled and quarter-wave-coupled bandpass filters utilizing monomode rectangular waveguides with 1 -dimensional offset discontinuities are described. The equivalent networks of these discontinuities, which consist of a shunt reactance and additional transmission lines connected at both sides, have been derived from the rigorous field-theoretical investigations of E-plane and H-plane displacements in rectangular waveguide. Both network elements are tabulated in terms of geometry and wavelength with fine steps to allow accurate interpolation by means of computational methods. Simple design formulae for the filter geometry as a function of the electrical specifications are given which are based upon narrow-band approximations. The analytical relationships required for a computer simulation of the filter's wide-band performance are summarized. The predicted frequency characteristics showed such close agreement with the experimental results obtained on two X-band filter models that neither tuning elements in the waveguide sections nor final adjustments of the offset widths had to be provided.

A Compact and Narrowband Displaced Substrate Integrated E-Plane Waveguide (Siew) Junctions Filter

“…where 1 ≤ i ≤ n and λ g 0 is the guided wavelength at the center frequency ω 0 . The ratio of the coupling window width over the waveguide width b ′ i /b can be determined following the numerical calculation provided in [17]. For the waveguide filter in Fig.…”

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Efficient optimization‐oriented design methodology of high‐order 3‐D filters using 2‐D and 3‐D electromagnetic simulators

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