Four-leaf-clover-shaped antenna for a THz photomixer

To improve the output power of a photomixer used as a THz source, we propose a four-leaf-clover-shaped antenna structure composed of a highly resonant radiation element and a stable DC feed element. The resonance characteristics of the proposed structure were first investigated on a half-infinite su...

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Bibliographic Details
Published in:Optics express 2010-08, Vol.18 (18), p.18532-18542
Main Authors: Woo, Insang, Nguyen, Truong Khang, Han, Haewook, Lim, Hanjo, Park, Ikmo
Format: Article
Language:English
Subjects:
Equipment Design
Lenses
Light
Optics and Photonics
Spectrophotometry, Infrared - methods
Terahertz Radiation
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Summary:To improve the output power of a photomixer used as a THz source, we propose a four-leaf-clover-shaped antenna structure composed of a highly resonant radiation element and a stable DC feed element. The resonance characteristics of the proposed structure were first investigated on a half-infinite substrate as a simplified radiation environment to reduce the computation time. Based on the antenna characteristics on that half-infinite substrate, the antenna structure was designed to have a maximum total efficiency and a maximum directivity on an extended hemispherical lens. The input resistance of this structure was six times that of a full-wavelength dipole, significantly improving the mismatch efficiency between a photomixer and the antenna. The terahertz output power from this structure is expected to be 2.7 times that of a full-wavelength dipole.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.18.018532