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A concurrent dual‐band LNA for noninvasive vital sign detection system
Author(s) -
Iyer Brijesh,
Pathak Nagendra P.
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28127
Subject(s) - multi band device , amplifier , microstrip , shunt (medical) , impedance matching , electrical impedance , electronic engineering , transistor , microwave , low noise amplifier , noise (video) , electrical engineering , computer science , engineering , optoelectronics , physics , telecommunications , voltage , cmos , antenna (radio) , medicine , artificial intelligence , cardiology , image (mathematics)
This article illustrates a pseudomorphic‐high electron‐mobility transistor 2.44‐/5.25‐GHz concurrent dual‐band low‐noise amplifier for noninvasive human vital sign detection using a standard hybrid microstrip integrated technology process. A novel dual‐band DC bias network is proposed to operate over 2.44‐/5.25‐GHz. Input and output impedance matching networks are designed using double open‐circuited shunt‐stubs. This allows simultaneous matching of arbitrarily different complex impedance (say of transistor) to standard 50‐Ω impedance at any two desired frequencies, while rejecting a wide‐band between them. The fabricated circuit exhibits gain of 7.15 and 7.80 dB, and noise figures of 4.34 and 4.69 dB at two desired frequency bands, respectively. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:391–394, 2014