2004 · 13 citations · 8 references
EngineeringMaterials ScienceAcousticsElectronic MaterialsMicrowave EngineeringMicrowave FiltersMicrowave Integrated CircuitsMicrowave PackagingMicrowave ResonatorsMicrowave Semiconductor DevicesResonant CircuitsAcoustic Wave FiltersBandpass FilteringBandpass FiltersChip-scale PackagingFlip-chip PackagingImpedance TransformationInsertion LossInsertion Loss Reduction
We present a highly selective balanced bandpass filter based on solidly mounted bulk acoustic wave (BAW) technology. The filter consists of four BAW resonators electrically coupled in lattice topology cascaded with three BAW resonators in balanced ladder topology and is fabricated as chip scale package suitable for flip-chip assembly. Impedance transformation from 50 /spl Omega/ to 150 /spl Omega/ is realized. The small size, low in-band insertion loss, sharp roll-off and high stop-band rejection make this filter an ideal choice as Rx filter in wireless communication applications at 2 GHz.
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PCS 1900 MHz duplexer using thin film bulk acousticresonators (FBARs)
R. Ruby, P. Bradley, John D. Larson et al. · Electronics Letters · 1999 · 196 citations
A 5 mm ×5 mm ×1.37 mm hermetic FBAR duplexer for PCS handsets with wafer-scale packaging
P. Bradley, R. Ruby, A.T. Barfknecht et al. · 2003 · 32 citations
Solidly mounted bulk acoustic wave filters for the GHz frequency range
H.P. Loebl, C. Metzmacher, D.-N. Peligrad et al. · 2003 · 29 citations
Natural Sciences, Electrical Engineering, Materials Science +15