Receiving Properties of Thin-Film Spiral Antenna Fabricated on Fused-Quartz Substrate Backed by Cupper Plate Reflector

Le Ngoc SON  Takashi TACHIKI  Takashi UCHIDA  Yoshizumi YASUOKA  

IEICE TRANSACTIONS on Electronics   Vol.E95-C    No.5    pp.936-941
Publication Date: 2012/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.936
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
spiral antenna,  antenna-coupled device,  microbolometer,  detected voltage,  

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Thin-film 2-arm Archimedean spiral antenna coupled with a bismuth (Bi) microbolometer was fabricated on a fused quartz substrate backed by cupper (Cu) plate reflector. Antenna patterns of the device agreed with the theoretical patterns derived from the imaging force model at 100 GHz band. The detected voltages of the antenna exhibited a periodic variation with changing the thickness of the substrate. The maximum and minimum detected voltages were obtained when the substrate thickness was odd and even integer multiples of a quarter of the wavelength in the substrate, respectively. Furthermore, the detected voltages were almost constant within the change of 3 dB ranging from 76.9 to 106.8 GHz. The wide band characteristic of the antenna was obtained.