Temperature stable bulk acoustic wave filters enabling integration of a mobile television function in UMTS system

Hao Zhang, Qingrui Yang, Wei Pang, Jian Guo Ma, Hongyu Yu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Multi-mode mobile equipment requires efficient radio-frequency (RF) filtering solutions to solve interference problems in an UMTS system integrated with a mobile television function. A RF filtering solution comprising a band-pass filter and a band-stop filter based on temperature-stable bulk acoustic wave resonator (BAW) technology is proposed in this letter. Both filters measurably demonstrate low insertion loss (∼3 dB), high rejections (35-40 dB), and fast roll-off (∼10 MHz} from pass band to stop band). A temperature coefficient of frequency (TCF) as low as - 4 ppm/°C} in the filters is achieved, which is five times lower than that of a conventional BAW filter. The low TCF is of critical importance, particularly in the sharp skirts, because trivial frequency changes associated with temperature variation could lead to failure against filter specifications at the skirt corners. The proposed filtering solution can be applied to minimize interference present in similar systems, such as mobile phones integrated with satellite radio or GPS navigation.

Original languageEnglish (US)
Article number6185699
Pages (from-to)239-241
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume22
Issue number5
DOIs
StatePublished - 2012

Fingerprint

3G mobile communication systems
Wave filters
Television
Acoustic waves
filters
acoustics
skirts
Resonators
radio frequencies
radio navigation
Temperature
Radio interference
resonators
temperature
interference
Insertion losses
Bandpass filters
Mobile phones
Global positioning system
coefficients

Keywords

  • Acoustic resonator
  • bulk acoustic wave resonator (BAW) filter
  • TD-CDMA mobile television (TDtv)
  • UMTS

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Temperature stable bulk acoustic wave filters enabling integration of a mobile television function in UMTS system. / Zhang, Hao; Yang, Qingrui; Pang, Wei; Ma, Jian Guo; Yu, Hongyu.

In: IEEE Microwave and Wireless Components Letters, Vol. 22, No. 5, 6185699, 2012, p. 239-241.

Research output: Contribution to journalArticle

Zhang, Hao ; Yang, Qingrui ; Pang, Wei ; Ma, Jian Guo ; Yu, Hongyu. / Temperature stable bulk acoustic wave filters enabling integration of a mobile television function in UMTS system. In: IEEE Microwave and Wireless Components Letters. 2012 ; Vol. 22, No. 5. pp. 239-241.
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