Programa del congreso

This communication presents a novel transition from an empty substrate integrated coaxial line (ESICL) to an empty substrate integrated waveguide (ESIW). Implemented using a standard planar manufacturing process, this transition facilitates the development of comprehensive microwave systems that integrate multiple technologies. The design methodology is detailed, and two ESICL-to-ESIW transitions for the Ku- and K-bands demonstrate simulated return losses better than 30 dB across their entire frequency ranges. To confirm feasibility, a back-to-back ESIW-ESICL-ESIW transition is fabricated and tested, achieving return losses greater than 19 dB and insertion losses below 0.45 dB.

In this work, corona discharge breakdown threshold in empty substrate integrated waveguide (ESIW) bandpass filters is studied. The objective is the analysis and improvement of the peak power handling capability of filters in this new technology. First, areas where the electric field has its maximum intensity are detected, and then a strategy based on introducing dielectric cylinders in these zones is applied. Simulation results show that, for a third order bandpass filter centered a 10,5 GHz and with 100 MHz of bandwidth, corona discharge breakdown thresholds between 2.2 and 3 dB higher than those of a standard ESIW bandpass filter are achieved.

This paper presents the design and analysis of an L-band antenna for Automatic Dependent Surveillance-Broadcast (ADS-B) signal reception from Low Earth Orbit (LEO) satellites at 1090 MHz. The proposed antenna is based on a six-faced prismatic array configuration that achieves omnidirectional coverage in the azimuth plane. Each face integrates a compact 4x2 subarray built from a miniaturized circular microstrip patch element with T-shaped extensions and dual-port excitation for circular polarization. The unit cell exhibits a reflection coefficient better than -10 dB and an axial ratio suitable for mitigating ionospheric rotation effects. Experimental validation of a 2x2 prototype confirms the simulated results, with a measured gain of 11.27 dB and a-3 dB beamwidth of 46.3 degrees. This preliminary design demonstrates the feasibility of integrating compact, high-performance antennas for spaceborne ADS-B reception systems, supporting global air traffic surveillance in remote and oceanic regions.

In this work, a new topology of waveguide combline filters based on flat metallic strip resonators is presented. The main advantages of this new topology are the ability to implement transmission zeros (TZ) and low-cost practical realization. Furthermore, the position of the TZs can be controlled using offset resonators, thus achieving more selective filter responses. The design of several bandpass filter examples with finite-frequency TZs is also discussed. Two different commercial software tools (Ansys HFSS and CST Studio Suite) have been used to verify the correct operation of the designed filters, thus validating both the proposed topology and the employed design procedure.

Esta contribución explora diferentes enfoques para las pruebas de alta potencia de elementos radiantes en condiciones de alto vacío. Las pruebas multipactor en dispositivos conducidos son una práctica estándar de la industria, sin embargo, las pruebas de elementos radiantes aún no han alcanzado ese nivel. La necesidad de validar los elementos radiantes en condiciones de vacío proviene del proyecto europeo Galileo de la Comisión. El trabajo se centra en los enfoques de trabajo y describe ideas inadecuadas para este propósito. En este trabajo se presentan dos soluciones de trabajo. La primera es una cámara de vacío transparente de RF colocada dentro de una cámara anecoica equipada con absorbentes de alta potencia. El segundo enfoque consiste en utilizar baldosas de ferrita dentro de una cámara de vacío estándar.