Practical Filters and Couplers: A Collection from Applied Microwave & Wireless
With contributions from more than 20 experts, these articles will show you how to use the latest design and testing techniques for filters, couplers and baluns.
TABLE OF CONTENTS Practical Filters and Couplers: A Collection from Applied Microwave & Wireless
Scaling Chebyshev Cutoff
Chebyshev low-pass filters often define cutoff as the highest ripple attenuation frequency (ripple cutoff). Since f c in the scaling equations above is a ?3 dB cutoff, the Chebyshev ripple cutoff cannot be used. Instead, the actual half-power frequency should be used for calculations. This frequency is calculated as follows:
For a low-pass filter,
and for a high-pass filter,
where f c is the desired ripple cutoff in hertz, and
where R dB is the pass band ripple in dB.
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