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International Journal of Antennas and Propagation - Volume 2016 2016, Article ID 6894676, 11 pages -

Research Article

Nagoya Institute of Technology, Nagoya 466-8555, Japan

DENSO CORPORATION, Kariya 448-8661, Japan

Received 4 October 2015; Revised 22 December 2015; Accepted 29 December 2015

Academic Editor: Wen-Qin Wang

Copyright © 2016 Kunio Sakakibara et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Low profile and simple configuration are advantageous for RF module in passive millimeter-wave imaging system. High sensitivity over broad operation bandwidth is also necessary to detect right information from weak signal. We propose a broadband layer-structured module with low profile, simple structure, and ease of manufacture. This module is composed of a lens antenna and a detector module that consists of a detector circuit and a broadband microstrip-to-waveguide transition. The module forms a layer structure as a printed substrate with detector circuit is fixed between two metal plates with horn antennas and back-short waveguides. We developed a broadband passive millimeter-wave imaging module composed of a lens antenna and a detector module in this work. The gain and the antenna efficiency were measured, and the broadband operation was observed for the lens antenna. For the detector module, peak sensitivity was 8100 V-W. Furthermore, the detector module recognized a difference in the absorber’s temperature. The designs of the lens antenna and the detector module are presented and the RF performances of these components are reported. Finally, passive millimeter-wave imaging of a car, a human, and a metal plate in clothes is demonstrated in this paper.





Autor: Kunio Sakakibara, Kunihiko Ohkawa, Yutaka Aoki, and Nobuyoshi Kikuma

Fuente: https://www.hindawi.com/



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