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Design of a Doherty Power Amplifier Using the Spiral PBG Structure for Linearity Improvement  

Kim, Sun-Young (Information and Telecommunication Engineering, Soongsil University)
Seo, Chul-Hun (Information and Telecommunication Engineering, Soongsil University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.1, 2008 , pp. 115-119 More about this Journal
Abstract
In this paper, the linearity of Doherty power amplifier has been improved by applying a new Photonic Bandgap(PBG) structure on the output of amplifier. The reposed spiral PBG structure is a two-dimensional(2-D) periodic lattice patterned on a dielectric slab that does not require nonplanar fabrication process. This structure has more broad stopband and high suppression performance than the conventional three cell PBG. Also, It has a sharp skirt property. We obtained the 3rd-order intermodulation distortion(IMD3) of -33dBc for CDMA applications with that of maintaining the constant power added efficiency(PAE), the IMD3 performance is improved as much as -8 dB compared with a Doherty power amplifier without PBG structure. Moreover, the physical length of PBG is shortened, therefore the whole amplifier circuit size is considerably reduced.
Keywords
Doherty Amplifier; Photonic Bandgap(PBG); Linearity;
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