Transición de banda ancha entre una línea microstrip y una guía ESIW mediante curvas de Bézier

Abstract

In this work a microstrip line to empty substrate integrated waveguide (ESIW) transition based on Bézier curves has been designed for different substrate heights and for different working band frequencies (WR-75 and WR-42). The transition is fully integrated into the ESIW guide and does not require an additional taper in the microstrip line. Therefore, radiation loss is reduced. The microstrip to ESIW transition is realized by applying Bézier curves to a dielectric slab embedded into the ESIW and at its corners (ESIW). Bézier curves allow to shape the transition with a greater control as compared to exponential or gradient curves used in previous works. Besides, a prototype has been manufactured obtaining good agreement between the simulated and the measured results.