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In this article, a new λ/4 bias line, combined with a dumbbell shaped defected ground
structure (DGS), is proposed to suppress harmonics in power amplifiers. The
proposed bias line maintains the required high impedance after the DGS is inserted,
while the width and length of the λ/4 bias line are broader and shorter than those of
conventional bias lines in power amplifiers. When the proposed bias line is used in
power amplifiers, the third as well as the second harmonics are reduced because of
the increased slow-wave effect of the proposed bias line over a wide harmonic
frequency band. The proposed bias line is applied to a power amplifier for an IMT-
2000 base station. It is shown that the reduction of the third harmonic component
and the improvements in the 1 dB power compression point, power-added efficiency
and IMD3 are 26.5 dB, 0.45 dB, 9.1 percent and 4.4 dB, respectively. |
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