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Design of 2.4/5.8GHz Dual-Frequency CPW-Fed Planar Type Monopole Active Antennas  

Kim, Joon-Il (Department of Electronic Engineering, Sogang University)
Chang, Jin-Woo (Department of Electronic Engineering, Sogang University)
Lee, Won-Taek (Department of Electronic Engineering, Sogang University)
Jee, Yong (Department of Electronic Engineering, Sogang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.44, no.8, 2007 , pp. 42-50 More about this Journal
Abstract
This paper presents design methods for dual-frequency(2.4/5.8GHz) active receiving antennas. The proposed active receiving antennas are designed to interconnect the output port of a wideband antenna to the input port of an active device of High Electron Mobility Transistor directly and to receive RF signals of 2.4GHz and 5.2GHz simultaneously where the impedance matching conditions are optimized by adjusting the length of $1/20{\lambda}_0$(@5.8GHz) CPW transmission line in the planar antenna The bandwidth of implemented dual-frequency active receiving antennas is measured in the range of 2.0GHz to 3.1GHz and 5.25GHz to 5.9GHz. Gains are measured of 17.0dB at 2.4GHz and 15.0dB at 5.2GHz. The measured noise figure is 1.5dB at operating frequencies.
Keywords
active antenna; impedance matching conditions; dual-frequency; CPW;
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