Passive WiFi. A new era for the IoT

While the Internet of Things (IoT) keeps growing up, the protocols used to connect the devices aren’t still efficient enough. Although some approaches like Zigbee or Bluetooth 4.0 LE have been developed, the great amount of sensors and actuators installed in a house require even more efficient protocols. Researchers from Washington University have developed “Passive WiFi”, a new communication possibility much more efficient than previous alternatives. But do not limit this great characteristics to IoT, also our laptops, smartphones and wereables will benefit from this amazing development. Let’s see some of its outstanding features.

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Passive WiFi can dramatically reduce energy consumption

As you may know, there are thousands of smart devices nowadays. They are part of the IoT. We can find smart thermostats like Nest, smart bulbs or air quality sensors among other solutions. The main drawback of those solutions is that they rely on plugs or batteries. Regarding those with batteries, the problem of energy waste is even bigger. Thus, we need a new protocol to diminish energy consumption.

Passive WiFi seems to be a promising solution for this purpose. According to researchers, energy consumption is reduced by 10,000 times compared with conventional WiFi and 1,000 times in comparison with ZigBee or Bluetooth LE. That means, only 15 to 60 uW.

But how does Passive WiFi work?

Well, we believe that it’s better that you watch the video below. In a nuthsell, we could say that common WiFi transmitters have two parts: one digital (with a really low energy consumption) and one analog (with an incredibly high consumption). The solution is to simplify the system creating a passive device based on the digital part that sends encoded packages to other devices (like smartphones).

Although there are other solutions to diminish the energy consumption of devices, or even delete that energy necessity like Freevolt, we do believe that this is a great approach. While the number of devices keep growing up, we do need a communication protocol that wastes much less energy than current ones.

Source: UWGizmag

Do you have any IoT device? Which one? Does it waste too much energy? Tell us!


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  1. arunwebanalyst

    nice one thanks for sharing

  2. Pingback: What Does the Future of Networking Look Like?

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