Hiroshi Mizutani

GaN/SiC SPDT gain switch MMICs utilizing bidirectional FET amplifiers for millimeter-wave applications

Koki Osada, Hiroshi Mizutani, Ryo Ishikawa

Abstract GaN/SiC single pole double throw gain switch microwave monolithic integrated circuits (MMICs) utilizing bidirectional field-effect transistor (FET) amplifiers have been successfully demonstrated in both resonant and non-resonant circuit configurations for millimeter-wave applications. The resonant-type bidirectional FET amplifier has anti-parallel FET amplifier …

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24 GHz GaN/SiC SPDT Resonant Gain FET Switch MMIC

Hiroshi Mizutani, Ryo Ishikawa

Correction: Gleaning of δ15N in ecosystems and its animal-organ isotope data: perspectives for the construction of the isotopically ordered world

Eitaro Wada, Yoshihisa Kudo, Hiroshi Mizutani, Hiroshi Minami et autres

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Gleaning of δ15N in ecosystems and its animal-organ isotope data: perspectives for the construction of the isotopically ordered world

Eitaro Wada, Yoshihisa Kudo, Hiroshi Mizutani, Hiroshi Minami et autres

Abstract To date, empirical relationships have been observed for the distributions and variations of stable nitrogen and carbon isotope ratios (δ 15 N and δ 13 C, respectively) in ecosystems as well as in living organisms. Here, we investigated δ 15 N …

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28-GHz GaN/SiC Series Gain Switch MMICs and Analysis of Their Power Handling Capabilities

Hiroshi Mizutani, Ryo Ishikawa, Kazuhiko Honjo

This is the first proposal of gain switch circuits using non-resonant series configured switchless bidirectional amplifier having fully depleted cold field effect transistor (FET) for millimeter-wave communications. Two types of 28-GHz gain switch microwave monolithic integrated circuits (MMICs) are designed and successfully …

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Nitrogen Isotope Ratios Identify Deserted Seabird Colonies

Hiroshi Mizutani, Yuko Kabaya, P.J. Moors, T.W. Speir et autres

avian DNA by restriction fragment length polymorphism analysis: convenient procedures based on blood samples from live birds.J. Ornithol.

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A Novel GaN/SiC MMIC Gain Switch Using a Resonant Bidirectional FET Amplifier

Hiroshi Mizutani, Ryo Ishikawa, Kazuhiko Honjo

This paper presents a novel gain switch circuit using a resonant bidirectional field-effect transistor (FET) amplifier. The proposed switch circuit can provide insertion gain even at the millimeter-wave frequencies by using a resonant bidirectional FET amplifier. The fundamental operation of a single …

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Extensive study on the effect of undoped GaAs layers on mesfet channels and its application for Ku-band extra high output power devices

Naotaka Iwata, Hiroshi Mizutani, Satoshi Ichikawa, Akira Mochizuki et autres

GaAs MESFETs have been successfully fabricated with undoped GaAs layers up to 2000Å thick on the n-GaAs channels. Gate contacts are put on the channels, by boring through the undoped layers. It was found that the undoped layer eliminates a surface depletion …

Small-signal design consideration for two-dimensional change-over switch GaN MMICs

Hiroshi Mizutani, Ryo Ishikawa, Kazuhiko Honjo

Abstract This paper presents small-signal design consideration for two-dimensional change-over switch GaN monolithic microwave integrated circuits (MMICs). For the design of two-dimensional change-over single pole single throw (SPST) switch circuit which electrically changes between low pass filter and high pass filter, the …

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Nationwide Survey of Medical Radiation Exposure on Cardiovascular Examinations in Japan

Tooru Ishibashi, Yasutaka Takei, Hajime Sakamoto, Yukari Yamashita et autres

Purpose: It is very important to manage the radiation dose of cardiovascular interventional (CVI) procedures. Overseas, the diagnostic reference levels for cardiac interventional procedures were established with the air kerma at the patient entrance reference point (Ka,r) and the air kerma-area product …

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A Novel Sub-6-GHz and 28-GHz GaN Switchable Diplexer MMIC for Carrier Aggregation with Massive MIMO Full Duplex Link

Hiroshi Mizutani, Ryo Ishikawa, Kazuhiko Honjo

This paper presents a novel sub-6-GHz and 28-GHz GaN switchable diplexer microwave monolithic integrated circuit (MMIC) for carrier aggregation (CA) with massive multiple-input multiple-output (MIMO) full-duplex (FD) link, which can mitigate self-interference (SI) in CA operation and can select antenna. The switchable …

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Proposal of a Novel SPDT Switch and Duplexer Dual-Function Circuit

Hiroshi Mizutani, Ryo Ishikawa, K. Honjo