In this manuscript, the use of dielectric rod waveguide antenna (DRW) with an embedded planar lens is proposed as a highly directional alternative to an electrically large hyper-hemispheric silicon lens for emission at millimeter and sub-millimeter wave frequencies. DRW antennas radiate properly if only the fundamental mode is excited to the structure. Since photomixer-based terahertz sources excite many modes, single-lobe radiation patterns are obtained only for lower frequencies of their potential working band. The use of embedded planar lenses is proposed for rectifying the wavefront phase and suppressing such higher-order modes in DRW, allowing an ultra-wideband operation.
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DRW antennas were manufactured in Aalto University Micronova Centre for Micro and Nanotechnology, in Espoo, Finland. Photomixers were manufactured in the Fiedrich-Alexander Universität Erlangen-Nürmberg, Germany. Integration, assembly, and measurements were done in Carlos III University of Madrid, Madrid, Spain.
A. Räisänen’s work at Universidad Carlos III de Madrid (UC3M) was granted by “Cátedras de Excelencia” from Banco Santander agreement. This work has been financially supported in part by the Academy of Finland under the DYNAMITE project and by Proyecto de investigació n “DiDaCTIC: Desarrollo de un sistema de comunicaciones inalámbrico en rango THz integrado de alta tasa de datos”, TEC2013-47753-C3 and, CAM S2013/ICE-3004 “DIFRAGEOS” projects. Dmitri Lioubtchenko’s work at UC3M was granted by a COST Short-Term Scientific Mission grant. Alejandro Rivera-Lavado’s work at Aalto University and Luis-Enrique García Muñoz’s work at Max Planck Institute für Radioastronomie were granted by Newfocus exchange visit grant from ESF research networking programme.
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Rivera-Lavado, A., García-Muñoz, L., Lioubtchenko, D. et al. Planar Lens–Based Ultra-Wideband Dielectric Rod Waveguide Antenna for Tunable THz and Sub-THz Photomixer Sources. J Infrared Milli Terahz Waves 40, 838–855 (2019) doi:10.1007/s10762-019-00612-1
- Dielectric rod waveguide
- High power terahertz
- Antenna emitter
- Embedded dielectric lenses