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Hybrid Bulk Acoustic Wave Structure for Temperature Stability in LTE Applications
- Authors
- Shin, Jea-Shik; Song, Insang; Kim, Chul-Soo; Son, Sang Uk; Lee, Moon-Chul; Kim, Duck-Hwan; Park, Ho-Soo; Cui, Jing; Ai, Yujie; Hwang, Sungwoo; Rieh, Jae-Sung
- Issue Date
- 9월-2013
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Bulk acoustic wave (BAW) resonator; RF duplexer; RF filter; temperature coefficient of frequency (TCF)
- Citation
- IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, v.23, no.9, pp.453 - 455
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
- Volume
- 23
- Number
- 9
- Start Page
- 453
- End Page
- 455
- ISSN
- 1531-1309
- 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 -11.5ppm/degrees C and an effective electro-mechanical coupling coefficient (kt(2))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.
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