access icon free High-selective wideband bandpass filter with adjustable notched-band using stub-loaded resonator

© The Institution of Engineering and Technology
Received 31/08/2013, Published

A high-selective microstrip wideband bandpass filter (BPF) with an adjustable notched-band is proposed. First, a pair of open-ended stubs is tap-connected to a λ/2 uniform impedance resonator at two symmetrical locations with respect to its centre, and they are further electrically connected by a microstrip line section. Such an arrangement leads to the emergence of a notched-band owing to the out-of-phase cancellation of two dissimilar signal paths in a wide passband. Secondly, the electrical path connecting the two open-ended stubs is gradually tuned so as to adjust the notched-band to the desired frequency location. Finally, a prototype filter is designed and fabricated, and its measured results are provided to verify the predicted frequency response.

Inspec keywords: microstrip lines; network synthesis; band-pass filters; resonator filters; microstrip filters; notch filters

Other keywords: dissimilar signal path cancellation; out-of-phase cancellation; microstrip line section; stub-loaded resonator; electrical path connection; λ-2 uniform impedance resonator; high-selective microstrip wideband bandpass filter; BPF; open-ended stub; adjustable notched-band

Subjects: Waveguide and microwave transmission line components; Waveguides and microwave transmission lines; Passive filters and other passive networks

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