Abstract
A new interference mitigation microwave photonic filter structure that can
realize a narrow, high-resolution notch with low amplitude and group-delay
ripple in the passband, which is tunable, and which is free of coherent
interference limitations, is presented. It is based on a multiple
double-pass modulation technique that introduces a new concept for
superposing the resultant notches in a predetermined manner so as to obtain
notch narrowing at the desired frequency while simultaneously flattening of
the response in the passband region. The notch frequency can also be tuned.
Experimental results demonstrate robust, coherence-free, multitap microwave
notch filter operation with narrow notch together with a wide and flat
passband, and which is also tunable.
© 2011 IEEE
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