<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1405-7743</journal-id>
<journal-title><![CDATA[Ingeniería, investigación y tecnología]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. invest. y tecnol.]]></abbrev-journal-title>
<issn>1405-7743</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Ingeniería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-77432005000400239</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Desarrollo, análisis y diseño de antenas tipo reflectarray]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrasco-Yépez]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arrebola-Baena]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Encinar-Garcinuño]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Politécnica de Madrid Departamento de Electromagnetismo y Teoría de Circuitos ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Politécnica de Madrid Departamento de Electromagnetismo y Teoría de Circuitos ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Politécnica de Madrid Departamento de Electromagnetismo y Teoría de Circuitos ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2005</year>
</pub-date>
<volume>6</volume>
<numero>4</numero>
<fpage>239</fpage>
<lpage>263</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-77432005000400239&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-77432005000400239&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-77432005000400239&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En este artículo se presenta una tecnología poco difundida y relativamente nueva: antenas reflectarray impresas, caracterizadas por un arreglo de elementos desfasadores fotograbado sobre una superficie plana que se ilumina mediante una antena de tipo bocina. La primera parte del texto ha sido escrita a manera de introducción para estudiantes de telecomunicaciones y como resumen para los especialistas en el tema, describiéndose las ventajas de estas antenas y sus limitaciones, principalmente en ancho de banda. Posteriormente, se muestra un método de análisis y diseño para reflectarrays multicapa, donde el coeficiente de reflexión en la superficie de un elemento del arreglo se obtiene a través del Método de Momentos en el dominio espectral y asumiendo periodicidad local. La técnica se ha aplicado para dos configuraciones distintas de elemento desfasador: una celda periódica formada por un parche acoplado por apertura a una línea de longitud variable y una celda multicapa formada por parches rectangulares de tamaño variable. Para este último caso, se ha construido un prototipo de reflectarray para haz tipo pincel. Finalmente, se presenta una técnica de síntesis de patrones de radiación que se aplica al diseño de reflectarrays de haz conformado, incluyendo ejemplos reales de aplicación espacial (DBS) y terrestre (LMDS).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This paper shows the most important features of a barely known and relatively new technology: microstrip reflectarray antennas, which are characterized by a microstrip array printed on a flat structure illuminated by a feed horn. The first part, is written as an introduction for the undergraduate and graduate telecommunications students and as a review for the antenna specialists. Advantages of these antennas are discussed as well as their limitations, mainly band width. In the second part, a method of analysis and design for multilayer printed reflectarrays is presented. The phase of the reflection coefficient at each array element (de fined as a periodic cell) is computed by the Moments Method in the spectral do main and assuming local periodicity. Two phase-shifter examples are shown: an aperture coupled unit cell and a multilayer cell with variable-size rectangular patches. A reflectarray with this last unit cell is used for a pencil beam application. Finally, a pattern synthesis technique to obtain contoured beams is de tailed, including two examples for space (DBS) and terrestrial (LMDS) applications.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Reflectarray multicapa]]></kwd>
<kwd lng="es"><![CDATA[celda periódica]]></kwd>
<kwd lng="es"><![CDATA[fase del coeficiente de reflexión]]></kwd>
<kwd lng="es"><![CDATA[método de momentos]]></kwd>
<kwd lng="es"><![CDATA[síntesis de patrones]]></kwd>
<kwd lng="es"><![CDATA[DBS]]></kwd>
<kwd lng="es"><![CDATA[LMDS]]></kwd>
<kwd lng="en"><![CDATA[Multilayer reflectarray]]></kwd>
<kwd lng="en"><![CDATA[periodic cell]]></kwd>
<kwd lng="en"><![CDATA[phase of the reflection coefficient]]></kwd>
<kwd lng="en"><![CDATA[method of moments]]></kwd>
<kwd lng="en"><![CDATA[pattern synthesis]]></kwd>
<kwd lng="en"><![CDATA[DBS]]></kwd>
<kwd lng="en"><![CDATA[LMDS]]></kwd>
</kwd-group>
</article-meta>
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<surname><![CDATA[Zornoza]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
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<surname><![CDATA[Encinar]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
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<source><![CDATA[Diseño de reflectarray impreso como antena sectorial de estación base de LMDS]]></source>
<year>2003</year>
<conf-name><![CDATA[ XVIIISimposium Nacional URSI]]></conf-name>
<conf-loc>Coruña, España </conf-loc>
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<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zornoza]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
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<name>
<surname><![CDATA[Encinar]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
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<article-title xml:lang=""><![CDATA[Efficient Phase-Only Synthesis of Contoured-beam Patterns for very Large Reflectarrays]]></article-title>
<source><![CDATA[International Journal of RF and Microwave Computer Aided Engineering]]></source>
<year>2004</year>
<volume>14</volume>
<page-range>415-23</page-range></nlm-citation>
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</article>
