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CFBWConstant Fractional Bandwidth (electrical engineering)
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Similar to the work in [48], the filter is able to tune the center frequency but at the same time maintain a constant fractional bandwidth and return loss.
Wordenweber, "Design of tunable ferroelectric filters with a constant fractional bandwidth," IEEE MTT-S International Microwave Symposium Digest, Vol.
Fabricated prototype of a tunable filter with constant fractional bandwidth and return loss [48].
Obviously, the first passband shows a tuning range 1.449-1.889 GHz, a insertion loss of 3.642-1.967dB, a constant fractional bandwidth of 4.35 [+ or -] 0.55%, and the second passband remains constant during the tuning process.
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