Programa del congreso

In this paper, the conventional equivalent circuit for inductive irises in rectangular waveguide is extended to account the propagation of a second mode at one of the iris terminals. The proposed model is employed to design bandpass filters incorporating cavities in which the TE₂₀₁ resonates. In these cavities, the dominant TE₁₀ mode is used to implement either a cross-coupling or an additional resonator. The proposed circuit facilitates a straightforward and accurate dimensioning process based on simple structures (the irises), while also offering greater design flexibility compared to existing approaches. Experimental results demonstrate that the TE₂₀₁ cavity-based filter presented here achieves significant length reduction and spurious-free range improvement relative to conventional designs.

This work introduces and evaluates the novel mushroom groove waveguide (MGW) as a cost-effective, low-loss alternative to conventional gap waveguides. The MGW and its half-mode variant (HM-MGW) are compared against other established gap waveguide technologies, including the conventional groove gap waveguide (GGW) and its half-mode variant (HM-GGW), both employing traditional metallic pins to emulate a perfect magnetic conductor. This work assesses the performance of an eventual power distribution network across four different realizations, focusing on insertion loss, ease of fabrication, and cost-effectiveness. Experimental measurements corroborate simulation results, offering critical insights for the practical implementation of MGW-based power distribution networks for millimeter-wave band applications.

This work examines the operation of a double-ridge waveguide (DRW) while using for synthesizing impedances. Different analysis were made regarding the frequency operation of a DRW and the impact that its physical dimensions can have in the impedance synthesis. This design comes after the concept of the stepped-impedance line transformer as a cascade of transmission lines with different characteristic impedances, but using, in this particular case, a stepped-ridge waveguide. By the analysis it can be extracted that this structure would be able to synthesize not only real impedances but an arbitrary impedance, following some restrictions explained in this paper.

This work presents an Integral Equation (IE) formulation aimed at analyzing horn antennas connected to a rectangular waveguide microwave filter serving as the input feed structure. To address the IE, the problem is split into two equivalent subproblems: one corresponding to the rectangular waveguide and the other associated with the horn antenna. An equivalent surface magnetic current density (Map) is defined at the discontinuity to establish coupling between the two subproblems. To minimize the total number of unknowns in the Method of Moments (MoM) solution of the IE, Lorentz gauge Green's functions are used, specifically, those corresponding to the rectangular waveguide and to a grounded half-space, respectively. Furthermore, to accelerate the computation of the slowly converging Green’s functions associated with the rectangular waveguide, the Ewald method is applied. The accuracy of the proposed IE method is verified by comparing its predicted radiation patterns and reflection coefficient for a pyramidal horn filtenna against results from the commercial full-wave software Ansys HFSS, demonstrating good agreement and higher computational efficiency.