Fixed and variable capacitors pdf
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- Capacitors from Wurth Electronics Midcom
- Variable Capacitor Construction, Working Types and Uses
- Factors Affecting Capacitance
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Capacitors from Wurth Electronics Midcom
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Variable Capacitor Construction, Working Types and Uses
They comprise fixed and flexible electrodes. Deformation, or actuation, of the flexible electrode changes the capacitance of the capacitor. This way, electrical properties of high frequency circuits can be modified. Traditionally, variable capacitors are based on a planar layout architecture, while a newer, vertical-wall, quasi three-dimensional approach theoretically enables increased device performance. Such devices depend on high aspect ratios, i.
Factors Affecting Capacitance
A variable capacitor is a capacitor whose capacitance may be intentionally and repeatedly changed mechanically or electronically. In mechanically controlled variable capacitors, the distance between the plates, or the amount of plate surface area which overlaps, can be changed. The most common form arranges a group of semicircular metal plates on a rotary axis " rotor " that are positioned in the gaps between a set of stationary plates " stator " so that the area of overlap can be changed by rotating the axis. Air or plastic foils can be used as dielectric material. By choosing the shape of the rotary plates, various functions of capacitance vs.
Capacitors are manufactured in their millions each day, but there are several different capacitor types that are available. Each type of capacitor has its own advantages and disadvantages can be used in different applications.