Abstract
Pairs of various Polyvinylidene fluoride P(VDF)-based polymers are used for fabricating bilayer fractional order capacitors (FOCs). The polymer layers are constructed using a simple drop casting approach. The resulting FOC has two advantages: It can be easily integrated with printed circuit boards, and its constant phase angle (CPA) can be tuned by changing the thickness ratio of the layers. Indeed, our experiments show that the CPA of the fabricated FOCs can be tuned within the range from -83° to -65° in the frequency band changing from 150 kHz to 10 MHz. Additionally, we provide an empirical formula describing the relationship between the thickness ratio and the CPA, which is highly useful for designing FOCs with the desired CPA.
Highlights
Fractional-order capacitors (FOCs) have attracted great interest in recent years since they provide an additional degree of freedom over conventional circuit elements.[1,2,3]
We develop a method to fabricate printed circuit board (PCB) - compatible FOCs with tunable constant phase angle (CPA) using layered ferroelectric polymers
The top Au electrode with a 3-mm circular form is deposited in a similar fashion using a shadow mask, so a total of nine separated electrodes are fabricated in a 2 cm × 2 cm area
Summary
Fractional-order capacitors (FOCs) have attracted great interest in recent years since they provide an additional degree of freedom over conventional circuit elements.[1,2,3] This means that they can enable more accurate circuit representations (i.e., mathematical models) characterizing, and implementing novel circuit components in a wide spectrum of disciplines: viz. energy-storage and generation device modelling,[4,5,6,7,8] sensor design,[9,10] corrosion modeling and characterization,[11] neuralsystem modeling,[12,13] bio-impedance characterization,[14,15] control-system design,[16] heat diffusion control,[17] electromagnetic system design[18,19] and electronic circuit design.[20,21,22,23] Recently, we demonstrated a fractional-order oscillator capable of generating oscillations at 10 fold higher frequency than its integer order counterpart.[20]. We develop a method to fabricate printed circuit board (PCB) - compatible FOCs with tunable CPA using layered ferroelectric polymers.
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