Development of new electric wireless seawater communication

researcher's name
about researcher KAWARADA, Hiroshi Professor
Faculty of Science and Engineering School of Fundamental Science and Engineering
research field
Electronic materials/Electric materials


● Academic : exploring the unknown deep sea
● Resources : available resources on the seabed accessible by developing underwater robot
● Telecommunication : construction of underwater IoT
  (monitoring of Tsunami, water temperature, NaCl’s concentration, pH, etc.)


● Electric communication utilizing conductivity of seawater
● Transmitter : metal electrode
        ⇔ Receiver : transistor shape sensor operating in solutions
● Apply square wave voltage to metal electrode
                  ➡ Pulse wave is transmitted to the receiver


●  Using ionic conduction ➡ high speed and isotropic propagation
●  Compact and low power for both transmitter and receiver
●  Using diamond for transistor ➡ stable operation in seawater


● Resources development : underwater robot control
   (Global market size : about $ 1.2 billion forecast in 2023※1)
● Amusement : marine sport, communication between divers
● Ecosystem : conservation of marine environment and development of fishery



same researcher's seeds

  • MOSFET on polycrystalline diamond
  • Vertically oriented graphite layers on diamond substrate
  • Boron-doped nanocrystalline diamond as a p-type transparent electrode
posted: 2020/02/06