RF filter Shape Factor vs Bandwidth-difference between Shape Factor and Bandwidth
This page compares RF filter Shape Factor vs Bandwidth and mentions difference between RF Filter Shape Factor and Bandwidth.
Shape Factor
• It indicates selectivity of the filter.
• It is the ratio of filter's response at 60 dB to response at 6 dB attenuation as shown in the figure.
• RF Filter shape factor can be expressed by following equation.
• RF Filter Shape Factor = (F4-F1)/(F3-F2)
• Lower the value of shape factor steeper the response of the rf filter.
Bandwidth
• Frequency range around center frequency over
which filter can be used efficiently and effectively is known as
bandwidth.
• Frequencies above and below the center
frequency at which response fall down by 3 dB with reference
to center frequency indicates upper and lower limits of filter bandwidth.
• RF Filter Bandwidth can be expressed by following equation.
• Bandwidth = F2-F1, Here Fc is center frequency.
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