Programa del congreso

An upgraded version of the complementary strip-slot radiating element is reviewed. The original radiating element consists in a microstrip-fed slot in transmission cofiguration. In the proposed modification, the slot is backed by a cavity in order to obtain unidirectional radiation. The presence of this cavity changes the behavior of the slot. A new equivalent circuit is used to propose a design methodology for broadband operation. Two array designs are simulated and implemented: a phased array and a log-periodic array. Promising experimental results verify the unidirectional radiation and the wide bandwidth of these antennas.

The authors propose a circuit methodology for the design of broadband stacked microstrip antennas fed through an aperture. An equivalent circuit (EC) is introduced for the antenna, which consists of an LC series resonator (the feed) plus two capatively coupled LC parallel resonators (the stacked patches). The circuit parameters are determined in terms of antenna simulations by means of a numerical de-embedding procedure. Then, the stage of the EC representing the two patches is designed using a circuit topology that implements a non-standard quasi-Chebyshev second order bandpass filter response. This non-standard topology enables a design of stacked microstrip antennas with bandwidths in excess of 30% by simply stacking one rectangular patch above another rectangular patch with inner and meandering slots. A prototype of the antenna has been fabricated and measured. Good agreement has been found between simulation and measurements for the return losses and the radiation patterns.

En este trabajo se estudiará el diseño de una agrupación de ranuras en banda K con una alimentación por onda progresiva proporcionada por la tecnología de guía de onda integrada en sustrato, más conocida como Substrate Integrated Waveguide (SIW). Las antenas con alimentación tipo serie o por onda progresiva proporcionan grandes ventajas tales como una gran compacidad estructural (en comparación con las redes de alimentación corporativas), banda ancha o altas prestaciones en cuanto a ganancia y eficiencia. Además, según aumenta la frecuencia este tipo de antenas son capaces de implementar un desapuntamiento del haz principal de radiación que puede ser interesante en diversas aplicaciones.

Sin embargo, normalmente las antenas de onda progresiva presentan cambios rápidos de su capacidad de acoplo con la frecuencia. Esto se traduce en que, si las especificaciones de eficiencia o de estabilidad del diagrama de radiación en banda de nuestro diseño son muy exigentes, puedan no cumplirse. Dicho de otro modo, el comportamiento típico en banda de las antenas de este tipo puede reducir el ancho de banda efectivo de la antena. Por tanto, en este trabajo se ha diseñado una antena de tipo array plana que proporcione alta ganancia, así como un incremento del ancho de banda efectivo de la antena en términos de radiación y eficiencia.

In this paper, a compact dual-feed annular ring patch antenna that covers two 5G millimeter-wave bands is presented. The bandwidths covered are the n258 (24.25 - 27.5) GHz and the n260 (37 - 40) GHz with polarization diversity due to the inclusion of a dual-feed aperture-coupled system.

This paper presents a Planar Inverted-F Antenna (PIFA) design for a smartwatch application, optimized to operate on the 2.4 GHz Bluetooth frequency band, on the proximity of the human forearm. The PIFA antenna is mounted on the watchstrap that is used as the antenna substrate. The antenna is fed in a singular way, since a coplanar wave-guide (CPW) transmission line is used to excite the antenna. The antenna is integrated in the watchstrap, curved over the phantom forearm and simulated along with the watchcase. A return loss of –20 dB is obtained at 2.4 GHz, and an efficiency of -5 dB, which represents a good efficiency taking into account the effect of the human forearm.