<?xml version="1.0" encoding="utf-8"?>
<TEI xmlns="http://www.tei-c.org/ns/1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:hal="http://hal.archives-ouvertes.fr/" xmlns:gml="http://www.opengis.net/gml/3.3/" xmlns:gmlce="http://www.opengis.net/gml/3.3/ce" version="1.1" xsi:schemaLocation="http://www.tei-c.org/ns/1.0 http://api.archives-ouvertes.fr/documents/aofr-sword.xsd">
  <teiHeader>
    <fileDesc>
      <titleStmt>
        <title>HAL TEI export of hal-02927129</title>
      </titleStmt>
      <publicationStmt>
        <distributor>CCSD</distributor>
        <availability status="restricted">
          <licence target="https://creativecommons.org/publicdomain/zero/1.0/">CC0 1.0 - Universal</licence>
        </availability>
        <date when="2026-05-16T21:51:29+02:00"/>
      </publicationStmt>
      <sourceDesc>
        <p part="N">HAL API Platform</p>
      </sourceDesc>
    </fileDesc>
  </teiHeader>
  <text>
    <body>
      <listBibl>
        <biblFull>
          <titleStmt>
            <title xml:lang="en">Negative Group Delay Theory on Li Topology</title>
            <author role="aut">
              <persName>
                <forename type="first">Blaise</forename>
                <forename type="middle">Elysée Guy</forename>
                <surname>Ravelo</surname>
              </persName>
              <email type="md5">62296febe245e2b2431323f1ed873294</email>
              <email type="domain">yahoo.fr</email>
              <idno type="idhal" notation="numeric">867782</idno>
              <idno type="halauthorid" notation="string">445947-867782</idno>
              <affiliation ref="#struct-462306"/>
            </author>
            <author role="aut">
              <persName>
                <forename type="first">Lili</forename>
                <surname>Wu</surname>
              </persName>
              <idno type="halauthorid">2017503-0</idno>
              <affiliation ref="#struct-462306"/>
            </author>
            <author role="aut">
              <persName>
                <forename type="first">Fayu</forename>
                <surname>Wan</surname>
              </persName>
              <email type="md5">22d770a1af61727c8c808ba3ab544b58</email>
              <email type="domain">nuist.edu.cn</email>
              <idno type="idhal" notation="numeric">1072670</idno>
              <idno type="halauthorid" notation="string">1966189-1072670</idno>
              <affiliation ref="#struct-462306"/>
            </author>
            <author role="aut">
              <persName>
                <forename type="first">Wenceslas</forename>
                <surname>Rahajandraibe</surname>
              </persName>
              <email type="md5">882d5b87106a784566d5782ebe9b64cc</email>
              <email type="domain">im2np.fr</email>
              <idno type="idhal" notation="string">rahajandraibe-wenceslas</idno>
              <idno type="idhal" notation="numeric">751037</idno>
              <idno type="halauthorid" notation="string">878972-751037</idno>
              <idno type="ORCID">https://orcid.org/0000-0003-1508-5927</idno>
              <affiliation ref="#struct-199957"/>
              <affiliation ref="#struct-198056"/>
              <affiliation ref="#struct-303091"/>
            </author>
            <author role="aut">
              <persName>
                <forename type="first">Nour</forename>
                <surname>Murad</surname>
              </persName>
              <email type="md5">a9642b96c37b2dd158ba9f562a4d563a</email>
              <email type="domain">univ-reunion.fr</email>
              <idno type="idhal" notation="string">nour-mohammad-murad</idno>
              <idno type="idhal" notation="numeric">5700</idno>
              <idno type="halauthorid" notation="string">26945-5700</idno>
              <idno type="ORCID">https://orcid.org/0000-0002-0497-7260</idno>
              <idno type="IDREF">https://www.idref.fr/197016006</idno>
              <affiliation ref="#struct-1049871"/>
              <affiliation ref="#struct-109876"/>
              <affiliation ref="#struct-209018"/>
            </author>
            <editor role="depositor">
              <persName>
                <forename>Nour Mohammad</forename>
                <surname>MURAD</surname>
              </persName>
              <email type="md5">a9642b96c37b2dd158ba9f562a4d563a</email>
              <email type="domain">univ-reunion.fr</email>
            </editor>
            <funder>Supported in part by the NSFC under Grant 61971230 and Grant 61601233, in part by the Jiangsu Distinguished Professorprogram and Six Major Talents Summit of Jiangsu Province under Grant 2019-DZXX-022, in part by the Postgraduate Research andPractice Innovation Program of Jiangsu Province under Grant SJKY19_0974, and in part by the Priority Academic Program Developmentof Jiangsu Higher Education Institutions (PAPD) Fund</funder>
          </titleStmt>
          <editionStmt>
            <edition n="v1" type="current">
              <date type="whenSubmitted">2020-09-02 10:13:57</date>
              <date type="whenModified">2024-06-10 16:58:03</date>
              <date type="whenReleased">2020-09-07 09:30:11</date>
              <date type="whenProduced">2020</date>
              <date type="whenEndEmbargoed">2020-09-02</date>
              <ref type="file" target="https://hal.science/hal-02927129v1/document">
                <date notBefore="2020-09-02"/>
              </ref>
              <ref type="file" subtype="publisherPaid" n="1" target="https://hal.science/hal-02927129v1/file/09028146.pdf" id="file-2927920-2577677">
                <date notBefore="2020-09-02"/>
              </ref>
              <ref type="externalLink" target="https://ieeexplore.ieee.org/ielx7/6287639/8948470/09028146.pdf"/>
            </edition>
            <respStmt>
              <resp>contributor</resp>
              <name key="322869">
                <persName>
                  <forename>Nour Mohammad</forename>
                  <surname>MURAD</surname>
                </persName>
                <email type="md5">a9642b96c37b2dd158ba9f562a4d563a</email>
                <email type="domain">univ-reunion.fr</email>
              </name>
            </respStmt>
          </editionStmt>
          <publicationStmt>
            <distributor>CCSD</distributor>
            <idno type="halId">hal-02927129</idno>
            <idno type="halUri">https://hal.science/hal-02927129</idno>
            <idno type="halBibtex">ravelo:hal-02927129</idno>
            <idno type="halRefHtml">&lt;i&gt;IEEE Access&lt;/i&gt;, 2020, 8, pp.47596-47606. &lt;a target="_blank" href="https://dx.doi.org/10.1109/ACCESS.2020.2979453"&gt;&amp;#x27E8;10.1109/ACCESS.2020.2979453&amp;#x27E9;&lt;/a&gt;</idno>
            <idno type="halRef">IEEE Access, 2020, 8, pp.47596-47606. &amp;#x27E8;10.1109/ACCESS.2020.2979453&amp;#x27E9;</idno>
            <availability status="restricted">
              <licence target="https://creativecommons.org/licenses/by/4.0/">CC BY 4.0 - Attribution<ref corresp="#file-2927920-2577677"/></licence>
            </availability>
          </publicationStmt>
          <seriesStmt>
            <idno type="stamp" n="AFRIQ">HAL-Francophonie, Afrique et océan indien</idno>
            <idno type="stamp" n="UNIV-TLN">Université de Toulon</idno>
            <idno type="stamp" n="CNRS">CNRS - Centre national de la recherche scientifique</idno>
            <idno type="stamp" n="UNIV-AMU">Aix Marseille Université</idno>
            <idno type="stamp" n="UNIV-REUNION">Université de la Réunion</idno>
            <idno type="stamp" n="LE2P" corresp="UNIV-REUNION">Laboratoire d'Energétique, d'Electronique et Procédés</idno>
            <idno type="stamp" n="PIMENT" corresp="UNIV-REUNION">Physique et Ingénierie Mathématique pour l'Énergie et l'environnemeNt et le bâtimenT</idno>
            <idno type="stamp" n="IM2NP" corresp="UNIV-TLN">IM2NP- UMR 7334</idno>
            <idno type="stamp" n="PAPANGUE">Papangue</idno>
            <idno type="stamp" n="FST-REUNION">UFR Sciences et technologies - Université de La Réunion</idno>
            <idno type="stamp" n="TEST-HALCNRS">Collection test HAL CNRS</idno>
            <idno type="stamp" n="ENERGY-LAB">ENERGY-LAB</idno>
          </seriesStmt>
          <notesStmt>
            <note type="audience" n="2">International</note>
            <note type="popular" n="0">No</note>
            <note type="peer" n="1">Yes</note>
          </notesStmt>
          <sourceDesc>
            <biblStruct>
              <analytic>
                <title xml:lang="en">Negative Group Delay Theory on Li Topology</title>
                <author role="aut">
                  <persName>
                    <forename type="first">Blaise</forename>
                    <forename type="middle">Elysée Guy</forename>
                    <surname>Ravelo</surname>
                  </persName>
                  <email type="md5">62296febe245e2b2431323f1ed873294</email>
                  <email type="domain">yahoo.fr</email>
                  <idno type="idhal" notation="numeric">867782</idno>
                  <idno type="halauthorid" notation="string">445947-867782</idno>
                  <affiliation ref="#struct-462306"/>
                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Lili</forename>
                    <surname>Wu</surname>
                  </persName>
                  <idno type="halauthorid">2017503-0</idno>
                  <affiliation ref="#struct-462306"/>
                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Fayu</forename>
                    <surname>Wan</surname>
                  </persName>
                  <email type="md5">22d770a1af61727c8c808ba3ab544b58</email>
                  <email type="domain">nuist.edu.cn</email>
                  <idno type="idhal" notation="numeric">1072670</idno>
                  <idno type="halauthorid" notation="string">1966189-1072670</idno>
                  <affiliation ref="#struct-462306"/>
                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Wenceslas</forename>
                    <surname>Rahajandraibe</surname>
                  </persName>
                  <email type="md5">882d5b87106a784566d5782ebe9b64cc</email>
                  <email type="domain">im2np.fr</email>
                  <idno type="idhal" notation="string">rahajandraibe-wenceslas</idno>
                  <idno type="idhal" notation="numeric">751037</idno>
                  <idno type="halauthorid" notation="string">878972-751037</idno>
                  <idno type="ORCID">https://orcid.org/0000-0003-1508-5927</idno>
                  <affiliation ref="#struct-199957"/>
                  <affiliation ref="#struct-198056"/>
                  <affiliation ref="#struct-303091"/>
                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Nour</forename>
                    <surname>Murad</surname>
                  </persName>
                  <email type="md5">a9642b96c37b2dd158ba9f562a4d563a</email>
                  <email type="domain">univ-reunion.fr</email>
                  <idno type="idhal" notation="string">nour-mohammad-murad</idno>
                  <idno type="idhal" notation="numeric">5700</idno>
                  <idno type="halauthorid" notation="string">26945-5700</idno>
                  <idno type="ORCID">https://orcid.org/0000-0002-0497-7260</idno>
                  <idno type="IDREF">https://www.idref.fr/197016006</idno>
                  <affiliation ref="#struct-1049871"/>
                  <affiliation ref="#struct-109876"/>
                  <affiliation ref="#struct-209018"/>
                </author>
              </analytic>
              <monogr>
                <idno type="halJournalId" status="VALID">107030</idno>
                <idno type="issn">2169-3536</idno>
                <idno type="eissn">2169-3536</idno>
                <title level="j">IEEE Access</title>
                <imprint>
                  <publisher>IEEE</publisher>
                  <biblScope unit="volume">8</biblScope>
                  <biblScope unit="pp">47596-47606</biblScope>
                  <date type="datePub">2020</date>
                </imprint>
              </monogr>
              <idno type="doi">10.1109/ACCESS.2020.2979453</idno>
            </biblStruct>
          </sourceDesc>
          <profileDesc>
            <langUsage>
              <language ident="en">English</language>
            </langUsage>
            <textClass>
              <classCode scheme="halDomain" n="info.info-ni">Computer Science [cs]/Networking and Internet Architecture [cs.NI]</classCode>
              <classCode scheme="halDomain" n="info.info-ts">Computer Science [cs]/Signal and Image Processing</classCode>
              <classCode scheme="halDomain" n="spi.elec">Engineering Sciences [physics]/Electromagnetism</classCode>
              <classCode scheme="halDomain" n="spi.tron">Engineering Sciences [physics]/Electronics</classCode>
              <classCode scheme="halTypology" n="ART">Journal articles</classCode>
              <classCode scheme="halOldTypology" n="ART">Journal articles</classCode>
              <classCode scheme="halTreeTypology" n="ART">Journal articles</classCode>
            </textClass>
            <abstract xml:lang="en">
              <p>This paper investigates an innovative negative group delay (NGD) theory of ''li'' geometrical shape topology. The li-topology is an outstandingly simple and fully distributed circuit comprised of a coupled line (CL). The li S-parameter model taking into account the CL coupling coefficient, delay and attenuation is established. The NGD analysis showing the possibility to generate NGD condition with respect to the li topology parameters is developed. The NGD characteristics as NGD value, center frequency, bandwidth, transmission and reflection coefficient are expressed. The li-NGD theory is validated with two proofs-of-concept implemented in microstrip technology. Calculated models, simulations and measurements are in good correlation. As expected, bandpass NGD presenting center frequency at approximately 2.56 GHz and 0.92 GHz with NGD level of approximately −0.9 ns and −3.7 ns were realized with the small and large li prototypes. Outstanding time-domain analyses explaining the bandpass NGD meaning, with innovatively low attenuation output, were also presented. The time-domain results highlight li-output pulse signal envelopes in time advance without violating the causality. INDEX TERMS Distributed circuit, li-topology, microwave theory, negative group delay (NGD), S-matrix modelling.</p>
            </abstract>
          </profileDesc>
        </biblFull>
      </listBibl>
    </body>
    <back>
      <listOrg type="structures">
        <org type="institution" xml:id="struct-462306" status="VALID">
          <idno type="ISNI">0000 0000 9249 2313</idno>
          <idno type="ROR">https://ror.org/02y0rxk19</idno>
          <orgName>Nanjing University of Information Science and Technology</orgName>
          <orgName type="acronym">NUIST</orgName>
          <desc>
            <address>
              <addrLine>No.219, Ningliu Road, Nanjing, Jiangsu</addrLine>
              <country key="CN"/>
            </address>
            <ref type="url">https://en.nuist.edu.cn/</ref>
          </desc>
        </org>
        <org type="laboratory" xml:id="struct-199957" status="VALID">
          <idno type="IdRef">142814105</idno>
          <idno type="RNSR">201220336G</idno>
          <idno type="ROR">https://ror.org/0238zyh04</idno>
          <idno type="Wikidata">Q51781330</idno>
          <orgName>Institut des Matériaux, de Microélectronique et des Nanosciences de Provence</orgName>
          <orgName type="acronym">IM2NP</orgName>
          <date type="start">2008-01-01</date>
          <desc>
            <address>
              <addrLine>Faculté des SciencesAvenue Escadrille Normandie NiemenCase 14213397 Marseille Cedex 20</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://www.im2np.fr/</ref>
          </desc>
          <listRelation>
            <relation name="UMR7334 /UMR6242" active="#struct-198056" type="direct"/>
            <relation name="UMR7334 /UMR6242" active="#struct-303091" type="direct"/>
            <relation name="UMR7334 / UMR6242" active="#struct-441569" type="direct"/>
          </listRelation>
        </org>
        <org type="institution" xml:id="struct-198056" status="VALID">
          <idno type="IdRef">15863621X</idno>
          <idno type="ISNI">0000 0001 2176 4817</idno>
          <idno type="ROR">https://ror.org/035xkbk20</idno>
          <orgName>Aix Marseille Université</orgName>
          <orgName type="acronym">AMU</orgName>
          <date type="start">2012-01-01</date>
          <desc>
            <address>
              <addrLine>Aix-Marseille UniversitéJardins du Pharo58 Boulevard Charles Livon13284 Marseille cedex 7</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://www.univ-amu.fr/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-303091" status="VALID">
          <idno type="IdRef">031122337</idno>
          <idno type="ROR">https://ror.org/02m9kbe37</idno>
          <orgName>Université de Toulon</orgName>
          <orgName type="acronym">UTLN</orgName>
          <desc>
            <address>
              <addrLine>Avenue de l'Université - BP 20132 - 83957 La Garde Cedex</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://www.univ-tln.fr/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-1049871" status="INCOMING">
          <orgName>Institut Universitaire de Technologie de Saint-Pierre</orgName>
          <desc>
            <address>
              <addrLine>Saint-Pierre</addrLine>
              <country key="FR"/>
            </address>
          </desc>
        </org>
        <org type="laboratory" xml:id="struct-109876" status="VALID">
          <idno type="RNSR">200622779N</idno>
          <orgName>Energy Lab</orgName>
          <orgName type="acronym">ENERGY Lab</orgName>
          <date type="start">2006-01-01</date>
          <desc>
            <address>
              <addrLine>Faculté des Sciences et techniques - Université de La Réunion 15 avenue René Cassin CS92003 97744 SAINT DENIS CEDEX 9</addrLine>
              <country key="RE"/>
            </address>
            <ref type="url">https://www.energylab.re/</ref>
          </desc>
          <listRelation>
            <relation name="UR4079" active="#struct-300316" type="direct"/>
          </listRelation>
        </org>
        <org type="laboratory" xml:id="struct-209018" status="VALID">
          <idno type="RNSR">201019044L</idno>
          <orgName>Physique et Ingénierie Mathématique pour l'Énergie, l'environnemeNt et le bâtimenT</orgName>
          <orgName type="acronym">PIMENT</orgName>
          <desc>
            <address>
              <addrLine>Campus universitaire du Tampon 117 rue du Général Ailleret 97430 Le Tampon</addrLine>
              <country key="RE"/>
            </address>
            <ref type="url">http://piment.univ-reunion.fr/</ref>
          </desc>
          <listRelation>
            <relation name="EA4518" active="#struct-300316" type="direct"/>
          </listRelation>
        </org>
        <org type="regroupinstitution" xml:id="struct-441569" status="VALID">
          <idno type="IdRef">02636817X</idno>
          <idno type="ISNI">0000000122597504</idno>
          <idno type="ROR">https://ror.org/02feahw73</idno>
          <orgName>Centre National de la Recherche Scientifique</orgName>
          <orgName type="acronym">CNRS</orgName>
          <date type="start">1939-10-19</date>
          <desc>
            <address>
              <country key="FR"/>
            </address>
            <ref type="url">https://www.cnrs.fr/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-300316" status="VALID">
          <idno type="IdRef">026404451</idno>
          <idno type="ISNI">0000000121112608</idno>
          <idno type="ROR">https://ror.org/005ypkf75</idno>
          <orgName>Université de La Réunion</orgName>
          <orgName type="acronym">UR</orgName>
          <date type="start">1982-10-15</date>
          <desc>
            <address>
              <addrLine>15, avenue René Cassin - CS92003 -97744 Saint Denis Cedex 9</addrLine>
              <country key="RE"/>
            </address>
            <ref type="url">http://www.univ-reunion.fr</ref>
          </desc>
        </org>
      </listOrg>
    </back>
  </text>
</TEI>