A novel structure of hybrid bulk acoustic wave (BAW) resonator with low temperature coefficient of frequency (TCF) is presented. Implemented with a pair of quarter-wave reflectors on air-cavity reflector, the hybrid BAW resonator exhibits a TCF of as low as and an effective electro-mechanical coupling coefficient of 5.1% at the frequency of 2.5 GHz. The hybrid BAW resonator also shows excellent Q-factors of 1627 and 1842 at resonance and anti-resonance frequency, respectively. RF duplexer configured with the hybrid BAW resonators is provided as well. The fabricated RF duplexer for long term evolution (LTE) band-7, which should be designed to prevent the co-existence problem with WiFi having extremely narrow fractional band-gap of 0.7%, achieves an attenuation of 36.8 dB and an insertion loss of 2.4 dB.Index Terms-Bulk acoustic wave (BAW) resonator, RF duplexer, RF filter, temperature coefficient of frequency (TCF).
This paper presents a biodegradable polymer droplet for efficient drug delivery using flagellated bacteria. The biodegradability and the localized delivery are the most important features for determining the efficiency of drug delivery. The proposed droplet is made of poly (DL-lactic-coglycolic acid) for the biodegradability. It is fabricated using a microfluidic device which has a Y-junction microchannel. The fabricated biodegradable droplet has diameter in the range between 20 ȝm and 30 ȝm. Then flagellated bacteria, Serratia marcescens, are attached to these droplets for a localized drug delivery. The Serratia marcescens has a chemotaxis to tumor cells, and thus can be used as an actuation source of selfseeking to the tumor site. This paper presents the proposed concept, droplet fabrication, bacteria attachment, and observed rotational motion of the drug delivery methodology. The experimentally achieved maximum angular velocity is 0.11 rad/sec.
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