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Pubmed for Handhelds

PUBMED FOR HANDHELDS

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  • Title: Ultra-miniature coupled resonator filter with single-layer acoustic coupler.
    Author: Jamneala T, Koelle UB, Shirakawa A, Gilbert SR, Nikkel P, Feng C, Ruby R.
    Journal: IEEE Trans Ultrason Ferroelectr Freq Control; 2009 Nov; 56(11):2553-8. PubMed ID: 19942541.
    Abstract:
    Coupled resonator filters designed using a single-layer coupler require coupling materials with an acoustic impedance less than 5.0 MRayl. Carbon-doped oxide, with an acoustic impedance of 4.8 MRayl and an acoustic attenuation of 200 to 600 dB/cm at 1 GHz, can be used as a single-layer coupler to produce a competitive 2-stage coupled resonator filter for cellular handset applications in the gigahertz frequency range. The electrical response of our filter is superior to that of coupled resonator filters using a traditional acoustic mirror as the coupling element. We present an ultra-miniature 0.58 mm x 0.38 mm coupled resonator filter operating at a frequency of 2.15 GHz.
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