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High-Frequency Integrated Circuits and Microwave Communication Devices Lab
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The lab designs, prototypes, and evaluates LSIs and antennas for wireless communication.
AboutAbout the lab
Building compact, low-power transceivers
The High-Frequency Integrated Circuits and Microwave Communication Devices Lab designs LSIs, antennas, and filters for wireless communication, and actually fabricates prototype LSI chips to evaluate them.
The frequency bands it studies are UHF, microwave, millimeter-wave, and terahertz.
Through joint research with Kyushu University's School of Medicine, School of Dentistry, and University Hospital, the lab also works on medical sensors and on supplying power to in-body sensors.
The lab's website presents it under the name "Kanaya Lab."
Key terms
- RF front end
- The part of a radio that amplifies the high-frequency signals exchanged through the antenna and converts their frequency.
- Matching circuit
- A circuit essential for preventing losses from signal reflection and extracting the maximum power.
- Energy harvesting
- Technology that collects energy available in the surrounding environment and converts it into usable electric power.
NewsLab news
View More ↗ResearchResearch themes
Realizing a world that is connected anytime and anywhere in the age of IoT, which relies on mobile phones, wireless LANs, satellites, and optical communication, requires compact, low-power transceivers. The lab develops circuits and components for wireless communication, such as low-noise amplifiers and mixer circuits miniaturized and integrated with distributed-element transmission lines, voltage-controlled oscillators, and compact antennas.
*Illustrative imageCircuit design for RF front ends
An RF front end consists of amplifiers, mixers, and oscillators, together with the impedance matching circuits that connect them. The lab has proposed a new design theory that uses coplanar waveguide (CPW) transmission lines for these components, which saves more than 50% of the on-chip area compared with conventional designs.
*Illustrative imageDesign of compact filters and matching circuits
The lab designs microwave filters such as bandpass filters on LSI chips to improve their characteristics and reduce their size. It has also designed impedance matching circuits, which connect receiver components to one another, using a new design theory based on meandered lines of conductor-backed coplanar waveguide, and carried the work through fabrication and evaluation.
*Illustrative imageDesign of compact antennas
Simply making an antenna smaller lowers its radiation efficiency. The lab systematically designs and optimizes "electrically small" antennas, whose dimensions are small relative to the resonant wavelength, and then fabricates and evaluates them. It also uses analysis tools to design and analyze antennas for RFID and wireless LAN, as well as antennas built on dielectric substrates or on chips.
*Illustrative imageCircuits that turn radio waves into power
The lab studies wireless energy harvesting circuits that collect electromagnetic waves present in the surrounding space and convert them into DC power. It aims at medical applications such as battery-free clips for laparoscopic surgery and passive implantable temperature sensors.
MembersFaculty
The members of the High-Frequency Integrated Circuits and Microwave Communication Devices Lab are faculty members and PhD, master's, and undergraduate students.As of 2026
- ProfessorHaruichi Kanaya
- ProfessorKuniaki Yoshitomi
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Microstrip Distributed Element Filter Technology” Binarysequence / CC BY-SA 3.0 (cropped)
- Circuit design for RF front ends: “MMIC example” Lmdlmd / CC BY-SA 3.0 (cropped)
- Design of compact filters and matching circuits: “Microstrip-bandpass-filter” Catslash / Public domain (cropped)
- Design of compact antennas: “Printed Antenna Go Via PCB pattern v1” Goodtiming8871 / CC BY-SA 4.0 (cropped)
- Circuits that turn radio waves into power: “Cell tower antenna, Zagrebačka cesta” Mnalis / CC BY-SA 4.0 (cropped)
- Related lab (無線通信研究室): “Wireless antenna on boat 1914-colorized” 作者不詳 / Public domain (cropped)
- Related lab (情報セキュリティー & マルチメディアセキュリティ研究室): “Firewall-X400” Cuda-mwolfe / CC BY-SA 4.0 (cropped)
- Related lab (知能ソフトウェア研究室): “Software Testing Life Cycle” Perfect Happiness / CC BY-SA 4.0 (cropped)
- Related lab (AI教育研究室): “Learning to Code” Preply.com Images / CC BY 2.0 (cropped)
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