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RF Inductors The following 3 parameters are important in RF applications: (a) Magnification factor (Q). Q or Magnification factor is a method of expressing the ratio of leading inductive reactance to effective d.c. resistance and is a measure of the losses in a coil. It is of great importance in a circuit design since
Inductors, being just coils of copper wire, will allow DC to pass easily, but when AC is applied, inductors create an opposition to current flow that increases, as the frequency of the alternating current increases.
Inductors are formed using insulated wire wound as a coil. The coil can be different shapes and sizes, and can be wound using different core materials. The inductance is dependent on multiple factors, such as the number of turns, core dimensions, and permeability. Figure 2 shows key inductor parameters.
voltage-conversion circuits to higher-frequency RF/microwave circuits. Selecting an inductor that is a good fit for a particular circuit design requires a clear understand-ing of indu. tor characteristics and how they are portrayed on product data sheets. Often referred to as coils, inductors.
Wire-wound toroids are widely used and readily available, but the wire winding process is expensive and results in a sub-optimal configuration. Improved toroidal inductors have been constructed by microfabrication [8] or by wire winding with specially shaped wire [9]. This paper describes optimization,
Wire wound RF inductors are designed on miniature ceramic or ferrite core bases and are used for applications with frequencies mainly >50MHz. They exhibit low inductance and high Q values, or on ferrite cores, for lower frequencies, the flux linkage between the turns of the coil dramatically increase the inductance value for the same size.
An inductor placed in series (in line) with a conductor, such as a wire or circuit board trace, blocks or impedes changes in current and functions as a low pass filter. Because inductors restrict or choke changes in current, they are also called "chokes".
