“…In this work two fully-printed MIM varactor designs have been presented. The first design was optimized for high-power operation and in a previous work proved full functionality in high-power matching circuits with power ratings of up to 1 kW [6]. To the best knowledge of the author, this was the first time a fully-printed component was presented capable of operation at this power level.…”
Section: Resultsmentioning
confidence: 99%
“…The first design is optimized for high-power operation and consists of six MIM varactor cells connected in series. The design has been proven to be capable of stable operation in matching circuits at power levels of 1 kW [6]. To the authors best knowledge, this is the first time a fully-printed component has been operated at this power level.…”
This work addresses the piezoelectric induced reduction of quality factor in fully-printed metal-insulator-metal (MIM) barium strontium titanate (BST) thick film varactors designed for high power operation. An acoustically optimized varactor design is presented and compared to a non-optimized high-power varactor. The design is utilized to present a narrowband acoustic suppression technique based on defined weights. The acoustically optimized varactor consists of 162 varactor cells in a capacitive matrix. The cells in the matrix are interconnectable allowing for a variable unbiased capacitance and power rating. Due to this setup, surface acoustic waves are interrupted, and the reduced size of the cells allows for a reduced BST layer thickness, shifting the acoustic resonance away from the operational frequency. Therefore, an inverted behavior in comparison to the high-power varactor is observed with an increasing quality factor with biasing voltage. Compared to the high-power varactor, the acoustically optimized varactor design shows a 40% increased quality factor in biased state. By applying the narrowband acoustic suppression technique, an increase in quality factor of 145% is achieved compared to the unsuppressed design. In comparison to the high-power varactor, the acoustical suppressed design shows an increase in quality factor of 480% at the first acoustic resonance frequency.
“…In this work two fully-printed MIM varactor designs have been presented. The first design was optimized for high-power operation and in a previous work proved full functionality in high-power matching circuits with power ratings of up to 1 kW [6]. To the best knowledge of the author, this was the first time a fully-printed component was presented capable of operation at this power level.…”
Section: Resultsmentioning
confidence: 99%
“…The first design is optimized for high-power operation and consists of six MIM varactor cells connected in series. The design has been proven to be capable of stable operation in matching circuits at power levels of 1 kW [6]. To the authors best knowledge, this is the first time a fully-printed component has been operated at this power level.…”
This work addresses the piezoelectric induced reduction of quality factor in fully-printed metal-insulator-metal (MIM) barium strontium titanate (BST) thick film varactors designed for high power operation. An acoustically optimized varactor design is presented and compared to a non-optimized high-power varactor. The design is utilized to present a narrowband acoustic suppression technique based on defined weights. The acoustically optimized varactor consists of 162 varactor cells in a capacitive matrix. The cells in the matrix are interconnectable allowing for a variable unbiased capacitance and power rating. Due to this setup, surface acoustic waves are interrupted, and the reduced size of the cells allows for a reduced BST layer thickness, shifting the acoustic resonance away from the operational frequency. Therefore, an inverted behavior in comparison to the high-power varactor is observed with an increasing quality factor with biasing voltage. Compared to the high-power varactor, the acoustically optimized varactor design shows a 40% increased quality factor in biased state. By applying the narrowband acoustic suppression technique, an increase in quality factor of 145% is achieved compared to the unsuppressed design. In comparison to the high-power varactor, the acoustical suppressed design shows an increase in quality factor of 480% at the first acoustic resonance frequency.
“…The capacitance of the varactor is thermally decreased by 47% from 2.5 to 1.3 nF. The varactor withstands an RMS voltage and current of 140 V and 14 A with a maximum temperature of 50.2 ° C. Compared to the varactor presented in [6], the results show a decrease in losses of 62%, a decrease in temperature of 33% while the product of RMS voltage and current for the here presented varactor is just slightly decreased by 5% from 2057 W of the varactor in [6] to 1960 W. Fig. 9.Large signal characterization results of the high-power varactor module for different input power levels and biasing states.…”
Section: Implementation Of a High-power Optimized Varactor Based On Dmentioning
confidence: 99%
“…BST as a tunable dielectric in varactors has been under investigation for several years now and shows promising results regarding Q -factor, tunability, tuning speed, and power handling capabilities. In comparison to state-of-the-art technologies, such as mechanically tuned vacuum capacitors or switchable capacitor banks, utilizing high-power pin diodes, BST-based varactors offer a significantly higher tuning speed and continuous tuning [5,6]. A disadvantage of BST-based varactors is the bias induced piezoelectricity in the ferroelectric layer, introducing a dipole moment.…”
Section: Introductionmentioning
confidence: 99%
“…The suppression mechanism utilizes novel fully-printed doublemetal–insulator–metal (MIM) varactor cells. The performance of the varactor is compared to an acoustically non-optimized varactor design presented in [6]. To the authors best knowledge, this is the first time a fully-printed double MIM varactor based on BST is demonstrated under high-power conditions.…”
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.
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