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  <doc>
    <id>3979</id>
    <completedYear/>
    <publishedYear>2010</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>4</pageLast>
    <pageNumber>4</pageNumber>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>IEEE</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A Narrow Via-free Composite Right/Left-Handed Leaky Wave Antenna with Low Cross-Polarization</title>
    <abstract language="eng">A frequency scanned leaky wave antenna is proposed and designed for operation in X-band. The guiding structure is realized as a composite right/left-handed transmission line composed of planar, periodically arranged via-free unit cells, implemented in microstrip technology. The main focus of the work was on the optimization of the electric field polarization characteristics. Hence, a cross-polarization level is achieved which is at least 20 dB below the co-polarization. The resulting maximum gain of the antenna is 13.7 dBi with a beamwidth of 9.5°. Furthermore, several of these narrow leaky wave antennas could be arranged in parallel resulting in an array with a clearance of less than half of a free space wavelength and allowing grating lobe free operation.</abstract>
    <parentTitle language="eng">IEEE Antennas and Propagation International Symposium, Toronto, Kanada</parentTitle>
    <identifier type="doi">10.1109/APS.2010.5561739</identifier>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Mark A. Eberspächer</author>
    <author>Thomas F. Eibert</author>
  </doc>
  <doc>
    <id>3980</id>
    <completedYear/>
    <publishedYear>2010</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>4</pageLast>
    <pageNumber>4</pageNumber>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>IEEE</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Ultra-Wideband Balun for Biconical Antenna Structures</title>
    <abstract language="eng">In this paper the design of a novel feeding structure is presented which has almost no impact on the antenna peformance and is furthermore adjustable to the input impedance of the antenna. The designed balun is characterized by measurement and simulation results of the input reflection coefficient. A biconical antenna is simulated with the balun and a coaxial transmission line feed to show the influence on the radiation patterns in the Eand H-planes.</abstract>
    <parentTitle language="eng">IEEE Antennas and Propagation International Symposium, Toronto, Kanada</parentTitle>
    <identifier type="doi">10.1109/APS.2010.5562124</identifier>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Arndt T. Ott</author>
    <author>Mark A. Eberspächer</author>
    <author>Thomas F. Eibert</author>
  </doc>
  <doc>
    <id>3981</id>
    <completedYear/>
    <publishedYear>2010</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>707</pageFirst>
    <pageLast>710</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>IEEE</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Treating Linear Antenna Arrays as Sampled Continuous Source Distributions</title>
    <abstract language="eng">Linear antenna arrays are usually described by the product of an array factor and a single element pattern. For certain configurations, such as the uniform linear array, the array factor can be obtained analytically by summing up the corresponding polynomial representation. The alternative of treating an array of finite extent as sampled continuous source distribution has been introduced many years ago, where however, the not very intuitive z-transformation approach has often been utilized in order to obtain closed form representations for many linear array configurations. In this paper, we work with sampled continuous source distributions and discuss their representation with Fourier transforms rather than with z-transforms. The relation to dispersion diagrams is shown and sampling with alternating sign is discussed. Particular focus is on leaky-wave antennas, where radiating TEM-waveguides, rectangular hollow waveguides, and composite right/left-handed waveguides together with the corresponding leaky-wave antennas are considered.</abstract>
    <parentTitle language="eng">URSI International Symposium on Electromagnetic Theory, Berlin,&#13;
Deutschland</parentTitle>
    <identifier type="doi">10.1109/URSI-EMTS.2010.5637265</identifier>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Thomas F. Eibert</author>
    <author>Mark A. Eberspächer</author>
  </doc>
  <doc>
    <id>3982</id>
    <completedYear/>
    <publishedYear>2010</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>27</pageFirst>
    <pageLast>32</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>article</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Leaky wave antenna with amplitude controlled beam steering based on composite right/left-handed transmission lines</title>
    <abstract language="eng">An antenna comprising two different composite right/left-handed transmission line structures is proposed which enables easy beam steering at an operation frequency of 10 GHz. The composite right/left-handed transmission lines are based on planar, periodically arranged via free unit cells, implemented in microstrip technology. Both transmission lines exhibit the infinite wavelength phenomenon which occurs at 9.72 GHz and 9.89 GHz, respectively. Thus, operating the different leaky wave structures at 10 GHz, radiation with azimuth angles of ±8° and ±17° can be achieved depending on the selected input port. In order to obtain a tunable main beam direction, the radiation patterns of both structures are superimposed by feeding them simultaneously. The influence of each guiding structure, and hence the direction of the main beam, can be controlled via the feeding amplitude. As a result of this, the beam can be steered between ±17° with a gain of up to 10 dBi. The guiding structures are arranged in parallel with a clearance of a=12.2 mm which is less than half of the wavelength in free space. This allows in a further step the attachment of additional guiding structures in order to increase the tunable angle range or creating an antenna array with a small beamwidth in the elevation plane without the occurrence of grating lobes. An antenna prototype was fabricated and validated by measurements.</abstract>
    <parentTitle language="eng">Advances in Radio Science</parentTitle>
    <identifier type="doi">10.5194/ars-8-27-2010</identifier>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Mark A. Eberspächer</author>
    <author>Thomas F. Eibert</author>
  </doc>
  <doc>
    <id>3983</id>
    <completedYear/>
    <publishedYear>2010</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>161</pageFirst>
    <pageLast>164</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>IEEE</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">An Analysis Procedure for 3D Metamaterial Unit Cells Based on the Rotated Transmission-Line Matrix Scheme</title>
    <abstract language="eng">A procedure is presented which enables, based on electromagnetic simulation, simple network parameter determination of three dimensional Composite Right/Left-Handed (CRLH) unit cells. The procedure is successfully applied to a three dimensional structure derived from the rotated transmission-line matrix (TLM) scheme. Based on the calculated element values a CRLH unit cell is optimized in order to realize a well balanced metamaterial structure.</abstract>
    <parentTitle language="eng">Loughborough Antennas and Propagation Conference, Loughborough, Großbritannien</parentTitle>
    <identifier type="doi">10.1109/LAPC.2010.5666239</identifier>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Mark A. Eberspächer</author>
    <author>Thomas F. Eibert</author>
    <author>Peter Russer</author>
  </doc>
  <doc>
    <id>3984</id>
    <completedYear/>
    <publishedYear>2010</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>165</pageFirst>
    <pageLast>168</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>IEEE</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Composite Right/Left-Handed Leaky Wave Antenna with Structurally Non-Periodic Unit Cell Arrangement</title>
    <abstract language="eng">A unique dominant mode structurally non-periodic Composite Right/Left-Handed (CRLH) Transmission-Line (TL) based Leaky Wave Antenna (LWA) is proposed, with a novel kind of unit cell arrangement, which utilizes the additional degree of freedom obtained from non uniform spacing between the unit cells to control the radiation behavior of the antenna. We investigated the influence of non uniformly spaced unit cell arrangements on the radiation performance of the CRLH LWA and determined an optimum unit cell arrangement which leads to an improvement of 3 dB in side lobe level (SLL) suppression when compared to its structurally periodic counterpart for broadside direction. Furthermore, various aspects which are critical and should be taken into consideration while designing a structurally non-periodic LWA comprising of non uniformly spaced unit cell arrangement are also addressed.</abstract>
    <parentTitle language="eng">Loughborough Antennas and Propagation Conference, Loughborough, Großbritannien</parentTitle>
    <identifier type="doi">10.1109/LAPC.2010.5666240</identifier>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Harshita Tolani</author>
    <author>Mark A. Eberspächer</author>
    <author>Thomas F. Eibert</author>
  </doc>
</export-example>
