TY - JOUR
T1 - Three-dimensional, ultra-wideband micromachined millimetre-wave hemispherical shell antenna
T2 - Theoretical concept and calibration
AU - Mirbeik, Amir
AU - Tavassoli, Vahid
AU - Ayazi, Farrokh
AU - Tavassolian, Negar
N1 - Publisher Copyright:
© The Institution of Engineering and Technology 2016.
PY - 2016/4/13
Y1 - 2016/4/13
N2 - This study presents a theoretical design study of a novel three-dimensional micromachined hemispherical shell antenna for ultra-wideband millimetre-wave imaging applications. The antenna is composed of a hemispherical metallic shell which is suspended on top of a high-resistivity silicon substrate using a thin silicon stem. The antenna exhibits two different operational modes and an exceptionally wide bandwidth of more than 80 GHz at the centre frequency of 120 GHz. Simulation results indicate that the antenna performance is highly sensitive to geometrical variations and hence to fabrication inaccuracies. Performing a complete sensitivity analysis using full-wave simulations requires numerous simulation steps and is therefore time-intensive and impractical. This study provides closed-form solutions for all performance metrics of the antenna, followed by a comprehensive theoretical-based sensitivity analysis for evaluating the effects of fabrication imperfections on its bandwidth. The antenna structure is then calibrated for ultra-wideband operations and low sensitivities to fabrication inaccuracies.
AB - This study presents a theoretical design study of a novel three-dimensional micromachined hemispherical shell antenna for ultra-wideband millimetre-wave imaging applications. The antenna is composed of a hemispherical metallic shell which is suspended on top of a high-resistivity silicon substrate using a thin silicon stem. The antenna exhibits two different operational modes and an exceptionally wide bandwidth of more than 80 GHz at the centre frequency of 120 GHz. Simulation results indicate that the antenna performance is highly sensitive to geometrical variations and hence to fabrication inaccuracies. Performing a complete sensitivity analysis using full-wave simulations requires numerous simulation steps and is therefore time-intensive and impractical. This study provides closed-form solutions for all performance metrics of the antenna, followed by a comprehensive theoretical-based sensitivity analysis for evaluating the effects of fabrication imperfections on its bandwidth. The antenna structure is then calibrated for ultra-wideband operations and low sensitivities to fabrication inaccuracies.
UR - http://www.scopus.com/inward/record.url?scp=84963975914&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84963975914&partnerID=8YFLogxK
U2 - 10.1049/iet-map.2015.0069
DO - 10.1049/iet-map.2015.0069
M3 - Article
AN - SCOPUS:84963975914
SN - 1751-8725
VL - 10
SP - 525
EP - 535
JO - IET Microwaves, Antennas and Propagation
JF - IET Microwaves, Antennas and Propagation
IS - 5
ER -