Title :
Hybrid Bulk Acoustic Wave Structure for Temperature Stability in LTE Applications
Author :
Jea-Shik Shin ; Insang Song ; Chul-Soo Kim ; Sang Uk Son ; Moon-Chul Lee ; Duck-Hwan Kim ; Ho-Soo Park ; Jing Cui ; Yujie Ai ; Sungwoo Hwang ; Jae-Sung Rieh
Author_Institution :
Samsung Adv. Inst. of Technol. (SAIT), Yongin, South Korea
Abstract :
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 -11.5 ppm/°C and an effective electro-mechanical coupling coefficient (kt2) 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.
Keywords :
Long Term Evolution; UHF resonators; bulk acoustic wave devices; electromechanical effects; BAW; LTE application; RF duplexer fabricated; TCF; WiFi; air-cavity reflector; antiresonance frequency; electromechanical coupling coefficient; extremely narrow fractional band-gap; frequency 2.5 GHz; gain 36.8 dB; hybrid bulk acoustic wave resonator structure; insertion loss; long term evolution; loss 2.4 dB; quarter-wave reflector; temperature coefficient of frequency; temperature stability; Acoustic waves; IEEE 802.11 Standards; Impedance; Q-factor; Resonant frequency; Temperature measurement; Bulk acoustic wave (BAW) resonator; RF duplexer; RF filter; temperature coefficient of frequency (TCF);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2013.2272609
