Programa del congreso

This work describes a new design strategy for improving the power handling capability (PHC) of groove gap waveguides (GGW). First, a theoretical analysis is carried out to study the distribution of the quasi-TE10 mode and the variation of the PHC for different configurations and frequencies. Then, in order to minimize the strength of the maximum electric field above the pins, three of the main geometrical dimensions of the nails are optimized. Finally, the numerical results show that by using this strategy, the corona discharge power thresholds can be enhanced without degrading the electrical response.

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.

A new compact balanced-to-balanced dual-band diplexer composed of two balanced dual-band bandpass filters in a multilayer configuration is proposed in this contribution. The two balanced bandpass filters are based on the use of magnetically coupled open-loop resonators. The magnetic coupling results in a strong inherent common-mode rejection, greater than 40 dB within all of the passbands. The four passbands are close to each other in under 700 MHz in the L band, used for many applications such as mobile services or satellite navigation. Measurements of a prototype example are provided to validate the obtained simulation results and verify the value of the proposed structure.

Additive tridimensional printers have opened new applications of dielectric and conductive materials for microwaves systems. Manufacturing dielectric pieces by 3D printers is relatively easy. The knowledge of dielectric properties, relative dielectric constant and loss tangent, allows the design of microwave components such as lenses or molding surfaces for microwave and millimeter wave absorbers. The experimental measurements of dielectric properties of Polylactic Acid (PLA) and resin materials commonly used in 3D printers, in frequency bands from 8 to 110 GHz, by using different methods, have permitted the design of special shaped molding surfaces for the manufacturing of microwave and millimeter wave absorbing devices. This paper presents characterization methods and experimental results.

We present a detailed design of a radio-frequency graphene-based phase shifter. The operating principle of the system consists in loading a transmission line (TL) with a bias-tunable capacitor implemented as a state-of-the-art metalinsulator- graphene (MIG) diode. In the analysis carried out in this work, the focus is set on obtaining a full comprehension of the main figures of merit of a unit-cell stage, which is formed by a TL loaded with the MIG diode, so that it can be arbitrarily replicated and thus periodically concatenated, guarantying low insertion losses (IL) and high return losses (RL). Such a distributed system allows achieving a desired phase shift range for a targeted application. In this regard, we predict the operation of a 10-stage phase shifter at 3 GHz providing an almost linear phase shift range of around 24.09 degrees in the bias window [-1.5, 0.5]V, with insertion losses (IL) of 1.29 dB and return losses (RL) of 20.14 dB.