Programa del congreso

this paper presents the design and analysis of a self-oscillator type active integrated antenna using InGaAs HEMT technology with a feedback structure. The compact oscillator (1.5 × 2.6 cm²) is fabricated on a Rogers 4003C substrate and operates at 2.68 GHz. Harmonic balance simulations, employing the auxiliary generator technique in Advanced Design Systems, predict an output power of 11.519 dBm at 2.680 GHz. Measured results confirm a power output of 11.436 dBm at 2.681 GHz. Phase noise levels are -117.69 dBc/Hz at 1 MHz and -139.27 dBc/Hz at 10 MHz, validated using a spectrum analyzer (R&S FPL1026, 5 kHz - 26.5 GHz). The strong correlation between simulated and measured results confirms the accuracy and reliability of the proposed design, demonstrating its effectiveness in generating wireless signals without external excitation sources.

This communication contains the analysis and design of time-modulated arrays (TMAs) controlled by FPGA, and using cellular automata programs as a control sequence. It also includes a study of the implications of this implementation. The design and implementation of a 4-element TMA are performed with a working frequency of 2.22 GHz. The HMC550AETR switch commercialised by Analog devices is used for the inclusion of time modulation in the system through a control sequence generated by the FPGA Altera Cyclone III 3C16. Y Wilkinson power dividers and antennas that electrically behave like dipoles are incorporated to complete the design. Finally, the TMA is tested by means of the measurement of the received signal and the array factor over time, while rule 135 of the cellular automata is executed.

Este trabajo presenta el diseño y simulación, mediante el simulador electromagnético CST Microwave Studio Suite, de una antena compacta que opera a 2 GHz, destinada a su integración en una cápsula biomédica ingerible. El objetivo es demostrar una estructura miniaturizada que pueda incorporarse a un dispositivo de diagnóstico ingerible, similar a una cápsula médica, para futuras aplicaciones de monitorización gastrointestinal (GI) basadas en la interacción electromagnética. La antena está impresa en un sustrato RO3010 y alimentada por una sonda coaxial, totalmente encapsulada en una estructura de PLA biocompatible. Aunque las simulaciones se llevan a cabo en espacio libre, este trabajo sienta las bases para futuras aplicaciones de detección de anomalías tisulares mediante contraste dieléctrico.

The characterization of non-linear devices is a critical aspect of developing high-frequency circuits for wireless communication applications. However, conventional experimental techniques have predominantly relied on linear models, such as S-parameters, and figures of merit obtained under DC conditions to extrapolate the non-linear behavior at high frequencies. This approach has been constrained by the lack of suitable tools for experimentally assessing the frequency-dependent nonlinear response. In this work, we present a methodology based on non-linear dispersion parameters, specifically X-parameters, to analyze the non-linear behavior of graphene-based rectifiers as a function of their DC operating point, including self-bias effects. This approach, which can be extended to any nonlinear technology, enables a shift from purely DC-based metrics to a characterization framework that explicitly incorporates frequency dependence. The proposed technique offers a more accurate understanding of non-linear behavior, particularly in RF-DC rectification and frequency doubler applications.