Journal
OPTICS EXPRESS
Volume 18, Issue 18, Pages 18532-18542Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.018532
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Funding
- Korean Government [2009-0083512]
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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. (C) 2010 Optical Society of America
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