Frequency-Tunable Slot-Loop Antenna Based on KNN Ferroelectric Interdigitated Varactors

Aspe, Barthélemy; Castel, Xavier; Demange, Valérie; Députier, Stéphanie; Bouquet, Valérie; Benzerga, Ratiba; Sauleau, Ronan; Guilloux-Viry, M.

doi:10.1109/lawp.2021.3084320

Cited by 10 publications

(1 citation statement)

References 26 publications

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“…With the rapid development of The Internet of Things, 5G networks and autonomous traffic, the frequency spectrum has been scarce; it requires the frequency, bandwidth and phase of front-end devices (such as antennas, filters and phase shifters) to be regulated [1][2][3][4]. It is a good strategy to fabricate front-end devices using varactors whose capacitor can be expediently controlled by external magnetic field, electric field or mechanical force [5][6][7][8]. The utilization of varactors not only reduces the volume and manufacturing cost of communication equipment, but also makes communication equipment have the ability of multi-band scanning and transmitting signals.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Tunability Achieving at Low Permittivity and Electric Field in (Ba0.91Ca0.09)(SnxZr0.2−xTi0.8)O3-2 mol% CuO-1 mol% Li2CO3 Ceramics

et al. 2023

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Ferroelectric varactors should have high tunability at low permittivity and a working electric field to obtain better impedance matching and stable tunability. In this work, (Ba0.91Ca0.09)(SnxZr0.2−xTi0.8)O3-2 mol% CuO-1 mol% Li2CO3 (abbreviated as BCSZT100x, x = 0.05, 0.10, 0.15 and 0.20, respectively) are prepared to achieve high tunability at low permittivity and a working electric field. The tunable mechanisms are investigated based on crystal structure, micro-morphology and the permittivity-temperature spectrum. The results show that the shrink of oxygen octahedron and weaker interaction force between Sn4+ and O2− make BCSZT5 ceramic have a higher tunability value of 26.55% at low permittivity (1913) and a working electric field (7.3 kV/cm). The tunability value of BCSZT5 ceramic increases by 58%, while its permittivity decreases by 25%, compared with x = 0. Those advantages make BCSZT5 ceramic have substantial application prospects in varactors.

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