A Wideband Leaky Lens Antenna with Frequency-Stable Beams for DESHIMA Spectrometer
O Yurduseven (Kavli institute of nanoscience Delft, TU Delft - Tera-Hertz Sensing)
Sjoerd Bosma (TU Delft - Tera-Hertz Sensing, Kavli institute of nanoscience Delft)
Akira Endo (TU Delft - Tera-Hertz Sensing, Kavli institute of nanoscience Delft, TU Delft - QN/Quantum Nanoscience)
Andrea Neto (Kavli institute of nanoscience Delft, TU Delft - Tera-Hertz Sensing)
N Llombat (TU Delft - Tera-Hertz Sensing, Kavli institute of nanoscience Delft)
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Abstract
DESHIMA (Deep Spectroscopic High-redshift Mapper) is an instrument aiming at efficiently making spectroscopic redshift measurements of sub-mm wave galaxies (SMGs), thereby providing about the formation and the evolution of stars and galaxies. The aim of this work is to provide a preliminary study into the design of a wideband leaky lens antenna coupled quasi-optical system within a 1:3 bandwidth. We propose a multi-pixel solution where the virtual sources are located on the lens focal plane. The design is able to provide frequency stable beams to achieve high Gaussian coupling efficiency within the entire bandwidth. We will evaluate the performance of the quasi-optical system design in terms of its Gaussicity and scan loss. The design is specifically targeted at the ASTE telescope located in Atacama, Chile.