Hybrid bulk acoustic wave structure for temperature stability in LTE applications

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

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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\ {\rm ppm}/^{\circ}{\rm C} and an effective electro-mechanical coupling coefficient ({\rm 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.

Original languageEnglish
Article number6568974
Pages (from-to)453-455
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number9
Publication statusPublished - 2013


  • Bulk acoustic wave (BAW) resonator
  • RF duplexer
  • RF filter
  • temperature coefficient of frequency (TCF)

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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