The design of inductor-capacitor (LC) filters for radio frequency (RF) circuits is often presented in its most arcane mathematical form. Use of that design approach allows you to optimize designs. However, this form is also above the capabilities of many people who could put filters to good use. A different approach is needed, and that approach is the normalized 1-MHz model. In this design approach, a model is built by calculating the component values for 1 MHz. The component values can be scaled for any frequency by dividing the 1-MHz value by the desired frequency, expressed in megahertz.
A limitation on this approach is that it assumes that the input and output impedances are both equal to 50 Ohm (i.e., the design impedance of the 1-MHz model filter). Because RF systems tend to have 50-Ohm impedances; however, this restriction does not pose a big problem in most cases.
