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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...
For the requirements of efficient integration and simple fabrication, a new codesign approach for a microstrip filter with an antenna array with reduced sidelobe level is introduced in this communication. The microstrip patch antennas and the stub-loaded resonators are used to illustrate the synthesis of a bandpass filtering antenna array. By controlling the coupling strength between the resonators,...
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...
We present the design of system-on-chip acoustic localizer chip that can be directly integrated with miniature MEMS microphone array. Continuous-time bandpass filtering and amplification at interface with microphone array enable low-power and small-form factor implementation. Time delays between acoustic signals observed over a planar geometry of four microphones are obtained by relating spatial and...
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