Design of spiral labyrinth microstrip antenna for DVB-T application

Digital television broadcasting is technologies that have been developed by any country in the world. The advantages implementations of digital television broadcasting include reception of picture and sound sharper and better. This paper proposes a new design of spiral labyrinth microstrip antenna feed by microstrip line with array two element for Digital Video Broadcasting Technology (DVB-T) application at work frequency of 586 MHz. The design of spiral labyrinth is used to minimize the dimensions of microstrip patch antenna while maintaining the working frequency at 586 MHz and array technique used to improve gain of antenna. The proposed antenna design was originally a rectangular patch that has been modified by the labyrinth spiral method. From the measurement result obtained return loss of -14.15 dB and VSWR of 1.54 at working frequency of 586 MHz. Bandwidth of proposed antenna is 117 MHz (547 MHz–664 MHz) while gain of antenna is 7.78 dBi. Beside that, using of the labyrinth spiral patch successfully reduced the dimensions of the microstrip antenna until 62.2% compared with the conventional rectangular patch of microstrip antenna. This study is usefull for DVB-T application in order to achieve the maximum signal quality and picture

Broadband modified-circle-shape patch antenna with H-aperture feeding for a passive radar array

In this paper, the design of a broadband modified-circle-shape patch antenna with H-aperture feeding is presented, to be used as single radiating element in the array of the surveillance channel of an UHF passive radar. Different techniques are proposed to achieve a relative bandwidth of more than 30%, and challenging radiation pattern characteristics for the defined application. The achievement of these requirements is proved through measurements in anechoic chamber. A NULA is designed using optimization techniques and considering coupling effects between elements. The NULA was integrated in IDEPAR, the passive radar demonstrator developed in the University of Alcalá, and validated through measurement campaigns. Results prove a significant improvement of the passive radar target detection and bearing estimation capabilities

Optimización de antenas de parche en el espectro actualizado de la TDT como parte de un sistema radar pasivo

Este TFG tiene como objetivo el estudio de la posible adaptación de la banda de trabajo de los elementos actuales para las nuevas frecuencias de la Televisión Digital Terrestre (TDT) tras el segundo dividendo digital que ha disminuido las frecuencias en las que se ubica el sistema de radiodifusión. Se llevará a cabo por la optimización de una antena tipo log-periódica construida con tecnología microstrip y una antena de parche con substrato de aire, esta última para polarización vertical, las soluciones se darán con el estudio de estas dos antenas mencionadas, de sus parámetros y la variación de dichos parámetros en función de la frecuencia (S11). Ambas soluciones serán posteriormente integradas en el demostrador IDEPAR [1] para su operación en esta nueva banda de frecuencia.The objective of this TFG is to study the possible adaptation of the working band of the current elements for the new frequencies of Digital Terrestrial Television (TDT) after the second digital dividend which has decreased the frequencies in which the broadcasting system is located. It will be carried out by optimizing a log-periodic antenna built with microstrip technology and a path antenna with an air substrate the latter for vertical polarization. The solutions will be found with the study of these two antennas mentioned, their parameters and the carination of said parameters as a function of frequency (S11). Both solutions will later be integrated into the IDEPAR demonstrator for operation in this new frequency band. Keywords: path antenna, microstrip technology,Grado en Ingeniería en Sistemas de Telecomunicació