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A novel microstrip dual-passband bandpass filter is proposed. With the assistance of modified quarter-wavelength stepped-impedance resonators, the dual-passband bandpass filter can be developed easily. Theoretical analysis and design procedures are provided; the prototypical bandpass filter with dual passbands is fabricated and measured as well. Well matched simulated results and experimental data...
A RF tunable active bandpass filter with active inductor using Q-enhancement circuit is presented. The RF active filter was implemented by the TSMC 0.35 ??m 3P3M BiCMOS process. In order to improve the quality factor of the active inductor, the Q-enhancement circuit was used to compensate the loss of the active inductor. The insertion loss of the RF tunable active filter is about 0.5 dB, and the tuning...
A new approach to realizing the miniaturized coplanar waveguide dual-band filter has been proposed. Embedding the spiral coupled line into the lowpass filter, the filter can readily generate dual passbands. The center frequencies of two passabands are designed at 2.4 and 5.8 GHz. The corresponding design equations have been described under ideal lossless conditions. Moreover, this coupler can be fabricated...
The novel dual- and triple-passband bandpass filters are proposed in this paper. With the interdigital resonators embedded into the half-wavelength resonators, the bandpass filter with multiple passbands can be obtained easily. Moreover, by adopting the method of interdigital resonators, the passband with broader bandwidth on the higher frequency band can be obtained easily. Theoretical analyses are...
A novel low-temperature co-fired ceramic (LTCC) dual-passband filter is proposed in this paper. This dual-passband filter comprises one transmission line and two shunt- connected stepped impedance resonators. Therefore, a transmission zero, which will increase isolation, can be easily generated in the middle of two passbands. Theoretical analysis and design procedures are also described in this paper...
The newly H-type microstrip bandpass filter is proposed in this paper. The use of H-type resonators not only can lead the second passband to the higher frequency band, but also can attenuate the shifted second passband to increase the suppression and broaden the stopband. The design methods and the measurements of the fabricated examples are introduced to validate the filter configuration.
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