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Frequency-tunable slot-loop antenna based on KNN ferroelectric interdigitated varactors

Abstract : 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.
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https://hal.archives-ouvertes.fr/hal-03242826
Contributor : Xavier Castel Connect in order to contact the contributor
Submitted on : Wednesday, June 16, 2021 - 1:52:43 PM
Last modification on : Friday, August 27, 2021 - 4:03:21 PM
Long-term archiving on: : Friday, September 17, 2021 - 6:51:27 PM

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Barthelemy Aspe, Xavier Castel, Valérie Demange, Stéphanie Députier, Valerie Bouquet, et al.. Frequency-tunable slot-loop antenna based on KNN ferroelectric interdigitated varactors. IEEE Antennas and Wireless Propagation Letters, Institute of Electrical and Electronics Engineers, 2021, 20 (8), pp.1414-1418. ⟨10.1109/LAWP.2021.3084320⟩. ⟨hal-03242826⟩

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