Novel 1-chip FBAR filter for wireless handsets

Byeoungju Ha, Insang Song, Yun Kwon Park, Duck Hwan Kim, Woonbae Kim, Kuangwoo Nam, James Jungho Pak

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Thin film bulk acoustic resonators, or FBARs, are surely a technical breakthrough for the miniaturization of RF filters and for the integration with other RF components. However, there are few problems of limitation in the size reduction and the difficulties in monolithic integration, because FBARs and auxiliary circuits are still manufactured separately and assembled using wire bonding process. Therefore, we establish for the first time a novel monolithic 1-chip transmit (Tx) filter that can be achieved with a minimum size of 1 mm × 1 mm × 0.8 mm using a suspended membrane FBAR, a integrated inductor, and wafer level packaging (WLP) for 1900 MHz PCS handsets. The 1-chip filter has an insertion loss less than 2.86 dB in the pass band (1850-1910 MHz) of US PCS Handsets. Attenuation characteristics is measured to show excellent performance at over 35 dB in Rx band (1930-1990 MHz) and over 25 dB in the below 1800 MHz range.

Original languageEnglish
Pages (from-to)247-253
Number of pages7
JournalSensors and Actuators, A: Physical
Issue numberSPEC. ISS.
Publication statusPublished - 2006 Aug 14


  • 1-Chip filter
  • FBAR
  • Trimming inductor
  • Wafer level packaging

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering


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