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Wada Lab
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The lab designs and prototypes filter circuits for microwave and millimeter-wave frequencies.
AboutAbout the lab
High-frequency circuits, centered on filters.
The Wada Lab studies high-frequency passive circuits, such as filters, used in high-frequency bands like microwave and millimeter-wave.
To communicate accurately on devices such as smartphones, a device must receive only a specific signal out of many radio waves, and filters are used for this technology.
Filters are large compared with other circuits, so miniaturization is required, and achieving their functions with simpler structures is also a challenge.
Research mainly proceeds by designing with a circuit simulator and an electromagnetic field simulator, then building actual prototype circuits and measuring and evaluating them.
Key terms
- High-frequency passive circuits
- Circuits, including filters, used in high-frequency bands such as microwave and millimeter-wave.
- Bandpass filter
- A device that extracts signals in a specific frequency band. Also called a BPF.
- Diplexer
- A circuit made up of multiple filters that splits a signal input at one port into two.
- Chipless RFID tag
- An RFID tag that has no IC chip.
NewsLab news
Lab open to visitors at the 2nd Open Campus (11/22)
A student received the Student Excellence Award and the Best Student Award at the Circuits and Systems workshop
A student received the top prize at the Student Microwave Circuit Design and Prototyping Contest
A student received the Student Encouragement Award at the IEICE Tokyo Section Student Convention
Began collaboration with Global Friendship Co., Ltd.
ResearchResearch themes
The Wada Lab centers on filters and studies practical high-frequency passive circuits that meet the rapid development of recent wireless communication systems. Research proceeds through foundational study sessions, literature surveys, topic selection, design by simulation, prototyping and measurement, and presentations on and off campus.
*Illustrative imageWideband bandpass filters
Among bandpass filters, which extract signals in a specific frequency band, the lab studies those that extract signals over a very wide frequency range. Because such wideband filters can achieve wideband characteristics even at higher frequencies, they are expected to be used in applications such as water vapor radiometers.
*Illustrative imageDiplexers for separating signals
The lab studies diplexers, which split a signal input at one port into two. It also works on triplexers, which handle three signals over a wider band, and has designed a differential wideband diplexer with a fractional bandwidth of over 40% in both of its two passbands.
*Illustrative imageChipless RFID tags
The lab studies RFID tags that have no IC chip. Using the basic resonator characteristics developed in its filter research, it designs these tags and is investigating NFC-type chipless RFID tags.
MembersFaculty
The Wada Lab consists of faculty members, a visiting professor, visiting researchers, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorKoji Wada
VoicesStudent voices
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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: “Waveguide stub filter” SpinningSpark / CC BY-SA 3.0 (cropped)
- Wideband bandpass filters: “K & L Microwave Incorporated” Arphotog / CC BY-SA 4.0 (cropped)
- Diplexers for separating signals: “Diplexer with two waveguide dielectric resonator filters” wd / CC BY-SA 4.0 (cropped)
- Chipless RFID tags: “Paper chipless tag” 87Liquidator77 / CC BY-SA 4.0 (cropped)
- Related lab (Ono Lab): “Microstrip-bandpass-filter” Catslash / Public domain (cropped)
- Related lab (Sugawara Lab): “Car parking sensor closeup” Shixart1985 / CC BY 2.0 (cropped)
- Related lab (Ohama-Santoso Lab): “NASA secure communication console at National Cryptologic Museum.agr” ArnoldReinhold / CC BY-SA 4.0 (cropped)
- Related lab (Hoang Lab): “C1702A die” Mister rf / CC BY-SA 4.0 (cropped)
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