%0 Journal Article %T Frequency-tunable slot-loop antenna based on KNN ferroelectric interdigitated varactors %+ Institut des Sciences Chimiques de Rennes (ISCR) %+ Institut d'Électronique et des Technologies du numéRique (IETR) %+ Synthèse Caractérisation Analyse de la Matière (ScanMAT) %A Aspe, Barthelemy %A Castel, Xavier %A Demange, Valérie %A Députier, Stéphanie %A Bouquet, Valerie %A Benzerga, Ratiba %A Sauleau, Ronan %A Guilloux-Viry, Maryline %Z 10.13039/501100011697-Rgion Bretagne; Conseil Dpartemental des Ctes dArmor; 10.13039/501100008530-European Regional Development Fund; Rennes Mtropole; Conseil Dpartemental dIlle et Vilaine; Direction Gnrale de lArmement; Saint-Brieuc Agglomeration; 10.13039/501100004562-Ministre de lEducation Nationale de lEnseignement Superieur et de la Recherche %< avec comité de lecture %@ 1536-1225 %J IEEE Antennas and Wireless Propagation Letters %I Institute of Electrical and Electronics Engineers %V 20 %N 8 %P 1414-1418 %8 2021-05-27 %D 2021 %R 10.1109/LAWP.2021.3084320 %K Antennas %K Antenna measurements %K Varactors %K Slot antennas %K Films %K Microwave antennas %K Substrates %K Ferroelectric films %K Microwave devices %K Tunable devices %Z Engineering Sciences [physics]/Materials %Z Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics %Z Engineering Sciences [physics]/ElectromagnetismJournal articles %X A miniature frequency-tunable slot-loop antenna (0.12800.0770) based on ferroelectric K0.5Na0.5NbO3 (KNN) interdigitated varactors is investigated in Ku-band. KNN material has been selected among the ferroelectric oxide family because of its competitive properties for microwave device applications. Its high permittivity value (r 360 at 10 GHz) and its wide frequency tunability under an external static electric field Ebias make it a promising candidate for frequency-agile antennas and circuits at microwaves. The antenna prototype has been designed and elaborated on MgO substrate (r = 9.8 and tan 10-4 at 10 GHz). Fabrication details including laser microetching process of the ferroelectric film are also described. The center frequency of the slot-loop antenna can therefore be tuned monotonously from 15.22 to 15.97 GHz under Ebias = 88 kV/cm, leading to a frequency tunability rate equal to 4.6%. These results demonstrate for the first time the ability of the KNN material to be used for miniature tunable antennas, in comparison with BaxSr1-xTiO3, currently considered as the most relevant material for such applications. %G English %2 https://hal.science/hal-03242826/document %2 https://hal.science/hal-03242826/file/Aspe%20et%20al-2021-Frequency-Tunable%20Slot-Loop%20Antenna%20based%20on%20KNN%20Ferroelectric%20Interdigitated.pdf %L hal-03242826 %U https://hal.science/hal-03242826 %~ UNIV-NANTES %~ UNIV-RENNES1 %~ CNRS %~ INSA-RENNES %~ ENSC-RENNES %~ IETR %~ SUP_IETR %~ ISCR %~ IETR_MF %~ ISCR-CSM %~ CENTRALESUPELEC %~ UR1-SPM %~ INC-CNRS %~ UR1-UFR-SPM %~ UR1-HAL %~ UR1-MATH-STIC %~ UR1-SDLM %~ UR1-UFR-ISTIC %~ SCANMAT %~ IETR-BEAMS %~ IETR-FUNMAT %~ IETR-ADH %~ TEST-UR-CSS %~ UNIV-RENNES %~ INSA-GROUPE %~ TEST-HALCNRS %~ UR1-MATH-NUM %~ UR1-MMS %~ IETR-SUMIT %~ NANTES-UNIVERSITE %~ UNIV-NANTES-AV2022