New protocols for future wireless systems

Chung, Jong-Moon; Park, KyuCheol; Won, Taeyeon; Oh, Wuihwan; Choi, Seungjun

doi:10.1109/mwscas.2010.5548725

Cited by 8 publications

(1 citation statement)

References 3 publications

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“…T he wiresless standards 3G, WiMax, LTE and others are quickly consuming the radio-frequency communication spectrum [1]. Mobile media applications such as mobile television and satellite radio must therefore use the interspaces between two allocated frequency bands, or the frequency spectrums adjoining allocated frequency bands.…”

Section: Introductionmentioning

confidence: 99%

Temperature Stable Bulk Acoustic Wave Filters Enabling Integration of a Mobile Television Function in UMTS System

Zhang

Yang

et al. 2012

IEEE Microw. Wireless Compon. Lett.

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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.Index Terms-Acoustic resonator, bulk acoustic wave resonator (BAW) filter, TD-CDMA mobile television (TDtv), UMTS.

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Section: Introductionmentioning

confidence: 99%