Full-Wavelength Dipole Antenna on a Hybrid GaAs Membrane and Si Lens for a Terahertz Photomixer

A full-wavelength dipole antenna on a GaAs membrane, covered with a silicon lens to improve the output power of a terahertz (THz) photomixer, is proposed. A full-wavelength dipole antenna supported by a GaAs membrane structure has been proven to achieve both high input resistance and high radiation...

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Bibliographic Details
Published in:Journal of infrared, millimeter and terahertz waves millimeter and terahertz waves, 2012-03, Vol.33 (3), p.333-347
Main Authors: Nguyen, Truong Khang, Han, Haewook, Park, Ikmo
Format: Article
Language:English
Subjects:
Antennas
Classical Electrodynamics
Collimation
Dipole antennas
Directivity
Efficiency
Electrical Engineering
Electronics and Microelectronics
Engineering
Gallium arsenide
Gallium arsenides
Instrumentation
Lenses
Membrane structures
Membranes
Optimization
Radiation tolerance
Silicon
Substrates
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Summary:A full-wavelength dipole antenna on a GaAs membrane, covered with a silicon lens to improve the output power of a terahertz (THz) photomixer, is proposed. A full-wavelength dipole antenna supported by a GaAs membrane structure has been proven to achieve both high input resistance and high radiation efficiency for improved overall efficiency. However, the antenna has insufficient directivity. An extended hemispherical lens was introduced in front of the antenna in a non-contact configuration and coupled to the antenna radiation to achieve high directivity by beam collimation. This approach greatly enhances the antenna directivity while avoiding an inherent obstacle of the input resistance reduction caused by the high permittivity lens substrate. The resulting antenna after optimization had a 3818-Ω input resistance and a 71.2% radiation efficiency, corresponding to approximately 57% total efficiency at the 1.07-THz resonance frequency. The total efficiency of this structure is approximately 6.8 times that of a full-wavelength dipole antenna with the same hemisphere lens size while exhibiting slightly lower directivity.
ISSN:1866-6892
1866-6906
DOI:10.1007/s10762-012-9876-z