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A compact W‐band quasi‐optical detector packaged by meta‐surface reflector and 3D‐printed lens
Author(s) -
Qiao HaiDong,
Liu Hao,
Mou JinChao,
Lv Xin
Publication year - 2020
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32062
Subject(s) - optics , detector , reflector (photography) , responsivity , antenna (radio) , materials science , optoelectronics , physics , electrical engineering , engineering , light source
This article presents a compact W‐band quasi‐optical detector that can be easily extended into an array for focal plane imaging applications. The quasi‐optical detector consists of an antenna‐coupled detector packaged by a low‐profile meta‐surface reflector and a 3D‐printed lens. The antenna‐coupled detector with a GaAs Schottky diode is printed on a low‐cost and low‐loss laminate. To extract the detected low‐frequency signal within a small footprint, a pair of vertical metallic posts instead of conventional planar strips is designed and loaded at the ends of the antenna. For facilitating unidirectional radiation patterns, a low‐profile meta‐surface reflector with a thickness of λ g /8 is placed under the antenna‐coupled detector. In addition, a 3D‐printed dielectric lens is loaded upon the antenna‐coupled detector, which can enhance the radiation gain by 6 dB. Both the meta‐surface reflector and the 3D‐printed lens are fixed by an asymmetric H‐shaped framework, forming a low‐cost and lightweight package for the detector. Based on the proposed detector, a W‐band 1 × 16 array is experimentally demonstrated, exhibiting a responsivity of 100 V/W~410 V/W from 92 to 110 GHz. The total size of the array is only 27 λ × 4 λ × 1.8 λ, where λ is the free space wavelength at the center frequency.