Low loss, fully-printed, ferroelectric varactors for high-power impedance matching at low ISM band frequency. Issue 7 (23rd May 2019)

• Record Type: Journal Article
• Authors: Kienemund, Daniel; Bohn, Nicole; Fink, Thomas; Abrecht, Mike; Bigler, Walter; Binder, Joachim R.; Jakoby, Rolf; Maune, Holger
• Editors: Kulpa, Krzysztof; Weinmann, Frank; Boria, Vicente E.; Martín, Teresa; Burgos, Mateo
• Is Part Of: International journal of microwave and wireless technologies. Volume 11:Issue 7(2019)
• Page Start: 658
• Page End: 665
• Publication Date: 2019-05-23
• Subjects: High power, -- tunable, -- fully-printed, -- ISM band; Wireless communication systems -- Periodicals; Microwave circuits -- Periodicals; Radio frequency -- Periodicals; 621.381305
• DOI: 10.1017/S1759078719000643
• Languages: English
• ISSNs: 1759-0787

Abstract

Abstract: Low loss, ferroelectric, fully-printed varactors for high-power matching applications are presented. Piezoelectric-induced acoustic resonances reduce the power handling capabilities of these varactors by lowering the Q -factor at the operational frequency of 13.56 MHz. Here, a quality factor of maximum 142 is achieved with an interference-based acoustic suppression approach utilizing double metal–insulator–metal structures. The varactors show a tunability of maximum 34% at 300 W of input power. At a power level of 1 kW, the acoustic suppression technique greatly reduces the dissipated power by 62% from 37 W of a previous design to 14.2 W. At this power level, the varactors remain tunable with maximum 18.2% and 200 V of biasing voltage.