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We propose and demonstrate a polarization beam splitter (PBS) based on a tapered directional coupler (DC). The tapered DC structure has the advantage of being insensitive to variations of the coupling length and the local coupling coefficient, and thus can significantly increase the bandwidth and polarization extinction ratio (ER). The fabricated PBS with one waveguide width tapered from 0.55 to 0...
A frequency-agile directional coupler incorporating the bandpass frequency response characteristic is proposed and characterized in this paper. This structure is modified from a conventional branch-line coupler and composed of two wide open-ended coupled lines. As such, it has good restraint performance outside the passband. Frequency tuning is achieved by modifying the electrical length of the open-ended...
In this paper, the SiC-based clamped-clamped filter was designed and fabricated. The filter was composed of two clamped-clamped beam micromechanical resonators coupled by a spring coupling beam. Structural geometries, including the length and width of the resonator beam and coupling beam, were optimized by simulation for high frequency and high Q, under the material properties of SiC. The vibrating...
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