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Numerical study of terahertz circular polarized substrate lens dipole antennas for polarization sensitive detectors

Published online by Cambridge University Press:  19 March 2015

Amna Mir ,
Junsheng Yu ,
Xiaodong Chen  and
Ishtiaq Ahmad
Amna Mir*
Affiliation:
School of Electronic Engineering, Beijing University of Posts and Telecommunications, 10 xitucheng Road, Haidian, Beijing, China
Junsheng Yu
Affiliation:
School of Electronic Engineering, Beijing University of Posts and Telecommunications, 10 xitucheng Road, Haidian, Beijing, China
Xiaodong Chen
Affiliation:
School of Electronic Engineering, Beijing University of Posts and Telecommunications, 10 xitucheng Road, Haidian, Beijing, China School of Electronic Engineering and Computer Science, Queen Mary University of London, London, E1 4NS, UK
Ishtiaq Ahmad
Affiliation:
School of Electronic Engineering, Beijing University of Posts and Telecommunications, 10 xitucheng Road, Haidian, Beijing, China
*
Corresponding author: A. Mir Email: amna_mir@hotmail.com
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Abstract

Wide band circular polarized (CP) antennas behind extended hemispherical lenses suitable for polarization sensitive THz detector and wireless communication have been designed and characterized using numerical simulation. Two novel, compact and CP dipole antennas are designed and studied for this purpose. CP property of planar antennas is achieved by geometrical modifications of antennas without any complicated feeding structure. Due to compact dimensions, wideband performance and CP behavior, these designs have applications in circular dichroism (CD) spectroscopy and terahertz detectors. This numerical study deals with polarization diversity with substrate lens, effect of off axis displacement on CP behavior of lens antenna which determines number of pixels for any application, far field patterns variation due to lens's internal reflection, directivity variation attributed to internal reflection and losses. Radiation efficiency variation of antenna by antenna dimensions is also studied carefully to design appropriate lens from application's point of view. Off axis performance of antenna on hemisphere lens is also studied and redesigning of antenna by some geometric modification has been carried out to improve far field patterns.

Keywords

Circular polarizationTerahertz planar antennaCross bow tieClover leaf antennaDielectric lensFocal plane arrayHalf power beam width
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 8 , Issue 3: Journee Nationale des Micro-ondes (JNM) 2015 , May 2016 , pp. 623 - 631
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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