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A tunable bandpass-to-bandstop filter using stub-loaded resonators is proposed in this letter. The proposed filter employs two open-circuited stub-loaded resonators with six varactors and a PIN diode. The center frequency of the proposed filter can be flexibly controlled by adjusting both odd-mode and even-mode resonant frequencies of the resonators. The bandpass-to-bandstop transformation can be...
In this communication, a new design for the microstrip-fed slot antenna with a directive radiation pattern for WLAN/WiMAX application is presented. By utilizing a two-element array topology, a unidirectional radiation pattern is obtained. Without any directors and reflectors, the proposed slot antenna shows advantages in terms of compact size and high front-to-back gain ratio in the azimuthal plane...
A novel microstrip diplexer with high isolation is proposed. The diplexer is comprised of two novel cascaded quadruplet bandpass filters. The cascaded quadruplet section consists of two half-wavelength resonators and two quarter-wavelength resonators, so the circuit won't occupy much space. By introducing multipath coupling, numerous transmission zeros are generated on each side of the passband and...
A transmission-line bandpass filter based on bandstop filter is proposed in this paper. A key merit of the filter configuration is that the position of the transmission zeros can be conveniently controlled whereas the bandwidth is fixed. The bandpass filter consists of two half-wavelength resonators, two open circuited uniform impedance resonators and one stepped impedance resonator. With five reflection...
Some novel bandstop filters (BSF's) are proposed,including a sharp-rejection BSF via the combination of the conventional BSF and signal interference technique, a sharp-rejection dual-band BSF using signal-interaction concept with three paths. The measurement results have a good agreement with the simulation results.
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