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Receiving properties of thin-film antennas for antenna-coupled terahertz radiation detectors, especially receiving properties of thin-film slot antennas are discussed comparing the antenna theory and the data obtained at the frequencies of 5 GHz, 94 GHz, 700 GHz, 2.5 THz and 28 THz.
A thin-film 2-arm spiral antenna with Bi microbolometer operating at 100 GHz band was fabricated. In the video detection, detected voltages, which were proportional to the power of signal wave at 94 GHz and a bias current, were obtained. DC sensitivity of the microbolometer was about 35 W-1.
Antenna-coupled GaAs Schottky barrier diode (SBD) detectors used at 180 GHz band were fabricated using micro-fabrication techniques, and radiation frequency of a gyrotron at the University of Fukui (Gyrotron FU CW IV) was measured by a harmonic mixing using the LO wave of 88.0899 GHz. The radiation frequency of gyrotron was found to be 176.077 GHz.
Thin-film slot antenna coupled GaAs Schottky barrier diodes (SBDs) were fabricated using a micro-fabrication technique, and detection properties such as antenna pattern, video detection and mixing were investigated at 100 GHz band. The E-plane and H-plane antenna patterns agreed well with the theoretical values and the operation of one-wavelength antenna was confirmed. The fabricated device had a...
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