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dc.contributor.authorAhdi Rezaeieh, S.en
dc.contributor.authorAntoniades, Marcos A.en
dc.contributor.authorAbbosh, A. M.en
dc.creatorAhdi Rezaeieh, S.en
dc.creatorAntoniades, Marcos A.en
dc.creatorAbbosh, A. M.en
dc.description.abstractA wideband and unidirectional loop antenna with enhanced and stable gain is presented. To reduce the size of the antenna, the loop is loaded with three mu-negative (MNG) metamaterial unit-cells. The proposed unit-cells consist of a series-gap capacitor and a shunt meandered floating inductor. The series capacitive loading is used to excite the zeroth order resonance (ZOR) of the MNG unit-cell, whereas the floating inductor is used to improve impedance matching. To enhance the front-to-back-ratio (FBR) of the antenna and widen its operating bandwidth, the loop is loaded with a tuning slot in the vicinity of the loaded unit-cells. To overcome the low gain of the antenna at frequencies above the ZOR and thus obtain a stable gain, two tightly coupled dumbbell and arc-shaped directors are proposed. The shape and operation of these directors are inspired by the cylindrical capacitor, which achieves higher coupling compared to a planar capacitor with the same area. The antenna achieves a compact size of 0.25λ0× 0.29λ0 with a wide fractional bandwidth of 34% at 0.76-1.07 GHz, and peak measured gain and FBR values of 4.5 dBi and 16 dB, respectively. © 2017 IEEE.en
dc.sourceIEEE Transactions on Antennas and Propagationen
dc.subjectMetamaterial antennasen
dc.subjectMicrowave antennasen
dc.subjectSlot antennasen
dc.subjectAntenna arraysen
dc.subjectDirective antennasen
dc.subjectCapacitive loadingen
dc.subjectCylindrical capacitorsen
dc.subjectFractional bandwidthsen
dc.subjectFront to back ratioen
dc.subjectLoop antennaen
dc.subjectLoop antennasen
dc.subjectMetamaterial antennaen
dc.subjectMu-negative (mng) transmission lineen
dc.subjectOperating bandwidthen
dc.subjectQuasi-yagi antennaen
dc.subjectUnidirectional loopen
dc.subjectZeroth order resonance (zor) antennaen
dc.titleGain Enhancement of Wideband Metamaterial-Loaded Loop Antenna with Tightly Coupled Arc-Shaped Directorsen
dc.description.endingpage2095Πολυτεχνική Σχολή / Faculty of EngineeringΤμήμα Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών / Department of Electrical and Computer Engineering
dc.source.abbreviationIEEE Trans Antennas Propagen
dc.contributor.orcidAntoniades, Marcos A. [0000-0002-9699-2387]

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