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10:26
Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
Ultra-miniature coupled resonator filter with single-layer acoustic coupler
Tiberiu Jamneala1, Uli B Koelle, Alexandre Shirakawa
1Avago Technologies, Inc, San Jose, CA, USA. Tiberiu.Jamneala@avagotech.com
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|November 28, 2009
Summary
Carbon-doped oxide serves as a single-layer coupler for competitive 2-stage coupled resonator filters. This material enables superior electrical response in ultra-miniature filters for cellular handsets.
Area of Science:
- Materials Science
- Electrical Engineering
- Acoustics
Background:
- Coupled resonator filters require specific acoustic impedance for single-layer couplers.
- Traditional acoustic mirrors present limitations in filter performance.
Purpose of the Study:
- To investigate carbon-doped oxide as a single-layer coupler for coupled resonator filters.
- To develop an ultra-miniature filter with enhanced electrical response for cellular applications.
Main Methods:
- Characterization of carbon-doped oxide's acoustic impedance and attenuation.
- Design and fabrication of a 2-stage coupled resonator filter using the material.
- Evaluation of the filter's electrical response and performance.
Main Results:
- Carbon-doped oxide possesses an acoustic impedance of 4.8 MRayl, suitable for single-layer couplers.
- The developed filter exhibits superior electrical response compared to those using acoustic mirrors.
- An ultra-miniature filter (0.58 mm x 0.38 mm) was successfully demonstrated at 2.15 GHz.
Conclusions:
- Carbon-doped oxide is a viable material for single-layer couplers in gigahertz coupled resonator filters.
- The new filter design offers a competitive solution for cellular handset applications.
- The study presents a significant advancement in miniaturization and performance for RF filters.
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