Microwave Band Pass Filter Calculator

This calculator determines the Shape Factor and Quality Factor (Q) of a microwave band pass filter based on its center frequency and bandwidth values. It helps evaluate the filter’s selectivity and performance in RF and microwave circuits.

Formulas

Shape Factor (SF) = BW_60dB / BW_3dB

Quality Factor (Q) = f_c / BW_3dB

Formula Explanation

• f_c: Center frequency of the filter.
• BW_3dB: Bandwidth at 3 dB attenuation point.
• BW_60dB: Bandwidth at 60 dB attenuation point.
• Shape Factor indicates how sharply the filter attenuates signals outside the passband.
• Quality Factor represents how narrow or selective the filter is.

Example

Input: f_c = 2 GHz, BW_3dB = 100 MHz, BW_60dB = 200 MHz

Result: SF = 2.0, Q = 20

Who uses it

Helpful for RF designers and communication engineers analyzing microwave filters for radar, satellite, or communication systems.