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A novel differential-mode (DM) bandpass filter (BPF) on microstrip-line topology with wideband common-mode (CM) suppression is presented. The DM BPF is composed of a pair of half-wavelength (λ/2) uniform impedance resonators and two coupled-line sections as feeding scheme. By installing an open-circuited stub in the middle of the coupled-line section, spurious CM response can be tremendously suppressed...
A dual-band bandpass filter using a transversal-interference multimode resonator is proposed. The resonator is composed of a flatten ring resonator attached with two open-circuited stubs. By properly selecting the connecting position between the stubs and a ring, the two pairs of resonant modes can be grouped to make up the dual-passband response, and they can be further separated with virtue of two...
A new dual-mode differential bandpass filter on a squared microstrip ring resonator with a slotline feeding scheme is presented. This filter consists of a microstrip dual-mode ring resonator, four identical slotlines equally spaced along the ring and two differential-mode microstrip line to slotline transitions. By perpendicularly installing the slotline between the differential feeding line and the...
A novel wideband bandpass filter using back-to-back microstrip-slotline transition and triple-mode slotline resonator is proposed. The triple-mode resonator is constructed with one full-wavelength slotline ring and a single short-circuited stub. Two microstrip feed lines are placed above the slotline in such a way that two intersection positions are placed at the 54° separation along the ring. With...
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