High-data-rate ultrasonic through-metal communication. The first idea of transferring power and sensor data through metal walls by means of ultrasonic waves was presented in a patent by Connor et al. Some critical performance metrics and characteristics of the channel can also be obtained. Though sensors were not mentioned in the patent, the proposed method is suitable for through-metal-wall data transmission for sensors isolated by metal walls. However, just as in [ 30 ], there is no measurement or performance information provided for these patented system, and it also appears that there are no acoustic-electric models of these systems.
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Indoor Wireless RF Channels

Because of their low average transmission power, as discussed in previous sections, UWB communications systems have an inherent immunity to detection and intercept. Since , a research group at U. Short-range ultrasonic communications in air using quadrature modulation. This simplicity makes an all-CMOS short for complementary metal-oxide semiconductors implementation of UWB transceivers possible, which translates to smaller form factors and lower production costs. One pair PZT stacks four The bottom line is that lower frequencies do offer advantages, but my view is that these advantages are often overstated.
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Compared with electromagnetic waves, acoustic waves, especially ultrasonic waves, have excellent propagation characteristics in both non-ferromagnetic and ferromagnetic materials, making it an attractive concept using ultrasound for power delivery and data transmission through metal walls. The transmission sheet operates at a resonance frequency as high as 25 MHz and it can achieve a higher data rate than the magnetic resonance coupling method. As the skin depth of the material increases rapidly with the increase of frequency, these systems usually operate at relative low frequencies such as several kilohertz. If there is any way through a wall, they will find it. Interviews Answers to Science Questions.
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Three-transducer configurations are still bulky and inconvenient. Therefore, the electromagnetic principle is only suitable for power transfer and data transmission at a relative low data rate through thin metal walls of low permeability such as stainless steel, aluminum, titanium, etc. Related Resources Store Articles Blogs. In [ 79 ] the work was extended to take account of the case where the channel consists of a steel-water-steel type of multilayer i. Further, a long-term performance and reliability assessment of this system were presented in [ 66 ] by performing an accelerated life testing. Received Sep 3; Accepted Dec 8. The developed model was proved to the ability of performing accurate channel performance prediction while reducing the computational complexity associated with finite element method.
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