Takuma Nishimura

Measurement of Principle 300 GHz Antenna for Array Antenna Module

Nagahiro Abe, Takuma Nishimura, Hikaru Watanabe, Ichiro Somada et autres

The first feature of these modules is the adaptation of the redistribution layer (RDL) process, which has achieved high-density and high-precision antennas in packages (AiP) integrated with RFIC. The second feature is double patch antennas with cavities for high-gain antennas. We designed …

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Machine-Learning-Driven Photocurrent Prediction in Multielement-Doped Hematite Photoelectrodes

Takuma Nishimura, Yoshitaka Kumabe, Yosuke Harashima, Mikiya Fujii et autres

High Resolution Image Download MS PowerPoint Slide Reliably predicting heterogeneous photocatalyst efficiency using machine learning (ML) remains challenging, because of variations in synthesis protocols and evaluation methods. To address this, we developed ML models to predict the photocurrent density, which is an …

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ArCSEM: Artistic Colorization of SEM Images via Gaussian Splatting

Takuma Nishimura, Andreea Dogaru, Martin Oeggerli, Bernhard Egger

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Antennas Incorporated with RFIC for the Sub-THz Band

Takuma Nishimura, Takumi Nagamine, Ryo Sakamaki, Yuanfeng She et autres

This study presents an antenna incorporated with a radiofrequency integrated circuit for the Sub-THz band. The proposed structure features a cavity-backed dual patch antenna fabricated using a redistribution layer and thick copper layer substrate processes, resulting in an antenna with high gain …

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Terahertz Wave Sensing Technology for Visualizing Hidden Objects

Akinori Taira, Michiya Hayama, Kazuaki Ishioka, Takuma Nishimura et autres

When sensing the shape and movement of objects in the near field, light waves and radio waves have been used as the medium so far. Methods using light waves include sensors such as cameras and ToF (Time of Flight) sensors, which can …

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Terahertz Sensing with CMOS-RFIC - Feasibility Verification for Short-Range Imaging using 300GHz MIMO Radar -

Ichiro Somada, Akihito Hirai, Keigo Nakatani, Akinori Taira et autres

For solving various social issues, sensing technology has gained significant interest. Terahertz waves, which combine the high resolution of light and transparency of radio waves, enable visualization of obstacles behind internal structures. So, it offers potential for new solutions. This paper introduces …

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Next Level of 1/1 μm Line and Space Copper Redistribution Layer Fabrication with Organic Dielectric Materials

Yu Shoji, Takuma Nishimura, Hisashi Ogasawara, Keika Hashimoto et autres

An electrical reliability of fine copper redistribution layer (RDL) with 1/1 μm line and space fabricated by using positive photosensitive polyimide (PSPI) has been demonstrated. The polyimide containing flexible molecular units in PSPI was introduced, in assumption to increase the entanglement of …

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Terahertz Sensing With CMOS-RFIC:Feasibility Verification for Short-Range Imaging Using 300-GHz MIMO Radar

Ichiro Somada, Akihito Hirai, Akinori Taira, Keigo Nakatani et autres

For solving various social issues, sensing technology has gained significant interest. Terahertz waves, which combine the high resolution of light and transparency of radio waves, enable visualization of obstacles behind internal structures. So, it offers potential for new solutions. This letter introduces …

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Four-way Power Combiner with Spring Contact Probes for High Power SSPA Modules

Takuma Nishimura, Hidenori Ishibashi, Yutaro Yamaguchi, Takumi Nagamine et autres

We propose a low-loss, high-heat dissipative fourway power combiner that can be applied to multiple monolithic microwave integrated circuits (MMIC) with flip-chip bonding for high power solid-state power amplifier modules. This structure mainly consists of a two-way power combiner comprising an air-filled …

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1/1 µm Line and Space Cu Wiring with Organic Dielectric Through High Electrical Reliability

Yu Shoji, Takuma Nishimura, Hisashi Ogasawara, Keika Hashimoto et autres

An electrical reliability of fine copper RDL with 1/1 µm line and space fabricated by using positive photosensitive polyimide (PSPI) has been demonstrated. The polyimide containing flexible molecular units in PSPI was introduced, which is assumed to increase the entanglement of each …

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Ka-Band Branch Line Coupler Applied Hexagonal Waveguide Suitable for Additive Manufacturing

Motomi Abe, Hidenori Yukawa, Yu Ushijima, Takuma Nishimura et autres

A hexagonal waveguide branch line coupler suitable for additive manufacturing is proposed in this study, and its design method is elucidated. The additive manufactured Ka-band coupler exhibits characteristics similar to those of a machined coupler, but its weight and cost are reduced …

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A 3-D Metal-Direct-Printed, Low-Cost, and Light Hexagonal Waveguide Ka-Band Branch Line Coupler

Motomi Abe, Hidenori Yukawa, Yu Ushijima, Takuma Nishimura et autres