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http://dx.doi.org/10.3807/KJOP.2009.20.5.294

Four-leaf Clover-shaped Antenna for THz Photomixer for High Output Power  

Woo, In-Sang (Department of Electrical and Computer Engineering Ajou University)
Nguyen, Truong Khang (Department of Electrical and Computer Engineering Ajou University)
Park, Ik-Mo (Department of Electrical and Computer Engineering Ajou University)
Lim, Han-Jo (Department of Electrical and Computer Engineering Ajou University)
Han, Hae-Wook (Department of Electrical and Computer Engineering Pohang University of Science and Technology)
Chu, Hong (Laser Optek)
Publication Information
Korean Journal of Optics and Photonics / v.20, no.5, 2009 , pp. 294-300 More about this Journal
Abstract
To improve the output power of a photomixer as a THz source, we propose a four-leaf clover-shaped antenna structure which is composed of a highly resonant radiation element and a stable DC feed element. The resonance characteristics of the proposed structure were investigated on a half-infinite substrate first as a simplified radiation environment in order to save the computation time. Based on the antenna characteristics on a half-infinite substrate, the antenna structure was designed to have a maximum total efficiency and a maximum directivity on an extended hemispherical lens. In comparison with a full-wavelength dipole, an input resistance of this structure increased six fold and this characteristic significantly improved the mismatch efficiency between a photomixer and an antenna. THz output power from this structure is expected to increase by 2.7 times as compared to a full-wavelength dipole case.
Keywords
THz photomixer; Antenna; Input impedance; Efficiency; Lens substrate;
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Times Cited By KSCI : 4  (Citation Analysis)
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