On the Phase Response and Radiation Efficiency of the Complementary Strip-Slot as an Array Element

The complementary strip-slot element is a broadlymatched microstrip radiator that has been used to design innovative series-fed arrays. It consists of a microstrip series-fed slot that have its complementary stub on the layer of the microstrip and aligned to the slot. In this contribution, the influence of the strip and slot geometry on its performance is studied through the analysis of four different designs. The obtained results highlight the possibility of controlling the radiation efficiency or the phase response, without compromising the broad matching. Therefore, potential series-fed arrays built with this element can exploit this feature to set the magnitude and phase of the excitations with certain flexibility.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. This work was supported by the Spanish Ministerio de Ciencia e Innovaci ´on (Programa Consolider-Ingenio 2010) under Grant CSD2008-00066, EME

Disipación de potencia en redes en celosía: la radiación del strip-slot complementario

A circuit property of symmetrical lattice networks is derived and applied to the analysis of symmetrical twoport electromagnetic structures. This property is related to the independence of the power dissipation in the series and cross impedances of the lattice network and the consequent independence in the power dissipated under even and odd excitation in the twoport structure. Its utility is illustrated with its application to a planar radiating element, the so-called complementary strip-slot. This property allows identifying the cause of the losses in the analysed example and explains the radiation origin.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Arrays planares basados en el elemento strip-slot complementario

Recently, the authors introduced a novel planar radiating element that exploits the characteristics of the slotline microstrip coupling to obtain a microstrip-fed slot with broadband matching. This paper reviews the main characteristics of the so-called complementary strip-slot element and comments on its use for building series-fed planar arrays. In this way, two different configurations of series-fed arrays are described: a traveling-wave array of five elements and a circularly-polarized ring array with four elements. The scanning capabilities of the former, together with the multiband behaviour of the circularlypolarized array are highlighted.Este trabajo ha sido financiado por el Ministerio de Ciencia e Innovaci ón (Programa CONSOLIDER-INGENIO 2010) bajo los proyectos CSD2008-00066, EMET, y CSD2008-00068, Terasense, y por la Junta de Andalucía bajo el proyecto P10- TIC-6883

The Complementary Strip-Slot: From the Unit-Cell of Artificial Transmission Lines to the Basic Element of Novel Antennas

The complementary strip-slot radiating element and its applications are reviewed. The element is a modified version of the conventional microstrip-fed slot that presents very broad matching. Its inherent lattice equivalent circuit, its use as unit-cell of artificial transmission lines and its utility as radiating element are described. Promising experimental results for prototypes of a phased uniform array, a sequentially-rotated ring array and a log-periodic array based on the element for microwave frequencies are included.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Problemas de Campos y Ondas en Telecomunicación

Problemas de campos y ondas en telecomunicación con soluciones

Temas Avanzados en Teoría Electromagnética

Colección de monografías sobre temas avanzados en el área de los sistemas de guiado de ondas. El contenido es adecuado para estudiantes que, habiendo seguido un curso básico, sientan especial predilección por el tema, para aquellos que inician su formación de postgrado en el área de electromagnetismo, y para titulados con experiencia que precisen, en un momento dado, una información más completa acerca de ciertos problemas ajenos a su actividad previa

Make EU trade with Brazil sustainable

Brazil, home to one of the planet's last great forests, is currently in trade negotiations with its second largest trading partner, the European Union (EU). We urge the EU to seize this critical opportunity to ensure that Brazil protects human rights and the environment