An FBAR Circulator

This letter presents the experimental demonstration of a film bulk acoustic resonator (FBAR) circulator at 2.5 GHz. The circulator is based on spatiotemporal modulation of the series resonant frequency of FBARs using varactors and exhibits a large isolation of 76 dB at 2.5 GHz. The FBAR chip (0.25 m...

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Bibliographic Details
Published inIEEE microwave and wireless components letters Vol. 28; no. 5; pp. 395 - 397
Main Authors Torunbalci, Mustafa Mert, Odelberg, Trevor J., Sridaran, Suresh, Ruby, Richard C., Bhave, Sunil A.
Format Journal Article
LanguageEnglish
Published IEEE 01.05.2018
Subjects
Circulators
Film bulk acoustic resonators
film bulk acoustic resonators (FBARs)
Frequency modulation
nonreciprocity
Resonant frequency
Varactors
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Summary:This letter presents the experimental demonstration of a film bulk acoustic resonator (FBAR) circulator at 2.5 GHz. The circulator is based on spatiotemporal modulation of the series resonant frequency of FBARs using varactors and exhibits a large isolation of 76 dB at 2.5 GHz. The FBAR chip (0.25 mm 2 ) consists of three identical FBARs connected in wye configuration. FBAR's quality factor <inline-formula> <tex-math notation="LaTeX">(Q) </tex-math></inline-formula> of 1250 and the piezoelectric coupling coefficient <inline-formula> <tex-math notation="LaTeX">{k_{t}}^{2} </tex-math></inline-formula> of 3% relax the modulation requirements, achieving nonreciprocity with small modulation to RF ratio better than 1:800 (3 MHz: 2.5 GHz).
ISSN:1531-1309
1558-1764
DOI:10.1109/LMWC.2018.2815271