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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 2 of 2 (0.143 seconds)Spelling suggestions: "subject:"ertical polarisation"" "subject:"certical polarisation""
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Improved bandwidth low-profile miniaturized multi-arm logarithmic spiral antennaZhu, Shaozhen (Sharon), Ghazaany, Tahereh S., Abd-Alhameed, Raed, Jones, Steven M.R., Noras, James M., Suggett, T., Van Buren, T., Marker, S. January 2014 (has links)
No / A low-profile (λ/43) miniaturized multi-element antenna is presented, which displays vertical polarization with an omni-directional radiation pattern. The antenna uses a logarithmic spiral shape as the main radiating element such that the impedance bandwidth of the antenna is much improved in comparison with both a strip-line square spiral design and a strip-line circular spiral design. The antenna demonstrates stable gain and useful efficiency over the operating frequency band. Significantly, the antenna provides a low profile, omnidirectional pattern in the azimuth plane, polarizes normal to the ground-plane with a 1.2% bandwidth and 0.5 dBi gain.
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Miniaturized tunable conical helix antennaZhu, F., Ghazaany, Tahereh S., Abd-Alhameed, Raed, Jones, Steven M.R., Noras, James M., Suggett, T., Marker, S. January 2014 (has links)
No / A miniaturized conical helix antenna is presented, which displays vertical polarization with electrically small dimensions of 10mm×10mm×45mm. The resonance of the antenna is made tunable by adding a variable digital MEMS capacitor load at the bottom of the helix, giving a tuning range of 316 MHz to 400 MHz. The antenna demonstrates considerable impedance matching bandwidth and gain over the entire tuning frequency band. Most importantly, the antenna is capable of compact, flexible and easy integration into a wireless device package or for platform installation. / Datong of Seven Technology Group, for their support under the KTP project grant No. 008734.
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