A film bulk acoustic resonator (FBAR) duplexer for USPCS handset applications

We will describe the design and measured performance of a duplexer based on film bulk acoustic resonators (FBARs) for the 1900 MHz PCS cellular phone market. Typical specifications for the duplexer require the Tx filter to attenuate frequencies in the Rx band by >40 dB while maintaining a worst-c...

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Bibliographic Details
Published in2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157) Vol. 1; pp. 367 - 370 vol.1
Main Authors Bradley, P., Ruby, R., Larson, J.D., Oshmyansky, Y., Figueredo, D.
Format Conference Proceeding Journal Article
LanguageEnglish
Published IEEE 2001
Subjects
Equivalent circuits
Film bulk acoustic resonators
Impedance
Insertion loss
Personal communication networks
Resonance
Resonant frequency
Resonator filters
Switches
Telephone sets
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Summary:We will describe the design and measured performance of a duplexer based on film bulk acoustic resonators (FBARs) for the 1900 MHz PCS cellular phone market. Typical specifications for the duplexer require the Tx filter to attenuate frequencies in the Rx band by >40 dB while maintaining a worst-case insertion loss of 3.5 dB over the Tx band. VSWR must be better than 2.2 in the pass-band (8.5 dB return loss). The Rx filter must attenuate the Tx frequencies by >50 dB while maintaining a worst-case insertion loss of 4.2 dB in the Rx band. Again, VSWR must be better than 2.2.
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ISBN:0780365380
9780780365384
ISSN:0149-645X
2576-7216
DOI:10.1109/MWSYM.2001.966908