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X ‐band balanced power amplifier using novel coupler with 50% power‐added efficiency
Author(s) -
Tsao KuanLiang,
Chen ChengHeng,
Jou Christina F.
Publication year - 1999
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/(sici)1098-2760(19990205)20:3<192::aid-mop14>3.0.co;2-i
Subject(s) - amplifier , electrical engineering , power added efficiency , hybrid coupler , power bandwidth , engineering , microstrip , rf power amplifier , power (physics) , power dividers and directional couplers , cascade amplifier , linear amplifier , harmonic , electronic engineering , physics , acoustics , cmos , quantum mechanics
In this paper, we demonstrate an X ‐band balanced power amplifier using a novel microstrip line dc blocking impedance‐transforming branch‐line coupler (DCITBC). This novel coupler has the function of dc blocking, which can easily cascade two stages of an active circuit together. Therefore, we can reduce the cost and the circuit size. The measured power‐added efficiency of this balanced power amplifier is 50% over the 9.8–10.2 GHz band, with an associated gain of 9 dB and 25 dBm output power. Additional important results are the superior performance of the harmonic suppression; the measured result shows a second harmonic below −40 dBc without an extra harmonic rejector. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 20: 192–195, 1999.