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A kind of wideband differential bandpass filters on the multimode slotline resonator has been proposed. In virtue of the hybrid microstrip/slotline structures, the common mode (CM) signals can be intrinsically rejected in the topology. Multiple modes of the slotline resonator are excited to construct the wideband passband in differential-mode (DM). Further, a novel design method has been deduced based...
A compact ultra-wideband (UWB) bandpass filter with an inherent notched band and steep slopes has been presented and implemented with the low temperature cofired ceramic technology. The filter is realized by a stepped-impedance T-shaped resonator (SITR) coupled to a pair of quarter-wavelength input/output feed-lines. The proposed SITR can facilitate not only a notched band, but also sharp roll-off...
A new hybrid-integrated dual-band filter is proposed for WLAN application, where the lower passband is implemented by a pair of stepped-impedance resonators (SIRs) and the higher passband is provided by two substrate integrated waveguide (SIW) cavities. In our design, the SIRs are embedded into the SIWs to reduce the size. The relationship between the parasitic resonances of SIW structure and the...
A novel class of microstrip bandpass filters with increased upper rejection band is proposed. Coupling properties between the microstrip resonators and feed lines are analyzed via voltage-wave functions. Suppressions of second and third harmonics can be achieved by proper selection of coupling regions. Using two half-wavelength resonators with and without centrally-loaded resistors, two experimental...
A high selective dual-band bandpass filter is presented. Stepped impedance resonators are employed to realize two passbands. Meanwhile, a new multi-coupling scheme is introduced so that two finite transmission zeros are generated between the two passbands to achieve a high out-of-band rejection. The filter is simple in structure and compact in size
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