1W Energous PowerBridge Installation Guide

1W Energous PowerBridge

Definitions and General Recommendations

• Operating volume: the 3D space where the Wiliot® Pixel Tags can harvest energy from the PowerBridge and broadcast data back to it.
  Operating Areas| h 1[m]| h 2[m]| d 1[m]| d 2[m]| TTFP[s] (1)| TBP[s] (2)
  ---|---|---|---|---|---|---
  Primary| 5| –| 7| –| ≤45| ≤25
  Extended/Optional| 5| 10| 7| 16| >45| >25
  1. TFFP: time to first packet; the time it takes for the Pixel to respond from the first exposure.
  2. TBP: time between packets; the time it takes the Pixel to respond while exposed.
• Use the primary area for time critical applications, where low TTFP and TBP is required.
• Use the extended/optional area in non-time critical applications, where high TTFP and TBP is acceptable.
  

PowerBridge Positioning Options

Recommendations for best performance

PowerBridge Positioning (Practical Examples)

Recommendations for best performance:

PowerBridge Powering and Mounting

Connect the PowerBridge to the power source and mount in a fixed position. The transmitter must be installed to provide a separation distance of at least 20 cm (in US) or 22 cm (in Canada) from all persons.

Pixel Tag Positioning

Recommendations for best performance:

• Place in the line of sight of the PowerBridge.
• Keep distance between Pixel Tag and PowerBridge within 10 meters.
• Place within the 3 dB beamwidth area of the transmitter, outside of the 30 cm recommended keep-out area.
• In some cases, the operating area may be subject to multi-path channel effects and power may vary at a given Pixel Tag location. To mitigate such effects, multiple transmitters may be required for full coverage.
  

Pixel Tag Positioning (Practical Examples)

Recommendations for best performance:

• IoT Pixels are optimized for attachment to plastic and cardboard surfaces.
• A spacer may be required for best performance when mounted to metal, ceramic, glass, or wood surfaces.
• On the image shown below, tags are placed on a cardboard box in various orientations:
  • Tags placed on the surface facing the TX (x-y plane) can achieve good performance at any angle/orientation.
  • Tags placed on other surfaces marked with a green check will also achieve good performance.
  • Tag locations marked with a red X are sub-optimal due to antenna cross-polarization; tag performance in these locations/orientations may vary.
    

Logical System Setup

Follow the instructions described in the Wiliot Ecosystem Setup Guide for the logical system setup.

Real World Examples

Retail Store

Achieving the best RF coverage in different environments. The following example is using a ceiling mount based system.

Area: ~100m2
Use-case: asset tracking
Environment: fashion retail store
Positioning: ceiling, facing down
Estimate of devices needed: 8 Power Bridges

Industrial Warehouse
Achieving the best RF coverage in different environments. The following example is using a wall mount system. This is an example only. The number of devices depends on various factors.

Area: ~800m2
Use-case: real time tracking
Environment: warehouse
Positioning: wall and transversal beam, facing forward
Estimate of devices needed: 46 Power Bridges

Trailer

Achieving the best RF coverage in different environments. The following example is using a ceiling mount system.

note diagram is not to scale, for illustration purposes only.

Area: ~34m2
Use-case: food-chain monitoring
Environment: trailer
Positioning: ceiling
Estimate of devices needed: 3 Power Bridges

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