Ultra-miniature coupled resonator filter with single-layer acoustic coupler.
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.
Jamneala
Tiberiu
T
Avago Technologies, Inc, San Jose, CA, USA. Tiberiu.Jamneala@avagotech.com
Koelle
Uli B
UB
Shirakawa
Alexandre
A
Gilbert
Stephen R
SR
Nikkel
Phil
P
Feng
Chris
C
Ruby
Rich
R
D000162:Acoustics / Q000295:instrumentation*; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005374:Filtration / Q000295:instrumentation*; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*; D008904:Miniaturization; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers