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RF notch filter having multiple notch and variable notch frequency characteristics
RF notch filter having multiple notch and variable notch frequency characteristics
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机译:具有多个陷波和可变陷波频率特性的RF陷波滤波器
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摘要
A filter network having the capability of establishing multiple, tunable notch frequencies. A notch filter path is established for each notch frequency and includes a bandpass filter and inverter. An input RF signal covering a wide frequency range is applied to all the notch filter paths. Each notch filter path produces an output spectrum that is equal in magnitude and 180° out of phase with respect to an undesired frequency spectrum. A combiner circuit combines the outputs of each notch filter path in parallel with the RF input signal to produce an RF output signal with all desired spectra unchanged and all undesired spectra attenuated.
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