Difference between revisions of "Smartphone Wireless"
From MgmtWiki
(→Existing Bands) |
(→RFID) |
||
| Line 18: | Line 18: | ||
* Battery Assisted Passive = typically a monitored sensor that is polled by RF | * Battery Assisted Passive = typically a monitored sensor that is polled by RF | ||
* Active = has batter and dual antenna - read range 300 feet | * Active = has batter and dual antenna - read range 300 feet | ||
| − | * Low Frequency 120 to 150 kHz. | + | * Low Frequency 120 to 150 kHz. - near touch scanning |
| − | * HF/NFC 13.56 MHz | + | * HF/NFC 13.56 MHz - range in centimeters |
| − | * UHF = 300 MHz to 3 GHz | + | * UHF = 300 MHz to 3 GHz - older |
| − | * UHF Gen2 = 860 to 960 MHz (works through rain) | + | * UHF Gen2 = 860 to 960 MHz - range several meters (works through rain) |
===[[NFC]]=== | ===[[NFC]]=== | ||
Revision as of 18:06, 20 December 2020
Contents
Full Title or Meme
There are a large number of radios on a Smartphone. This wiki looks at those that are not part of the cellular network.
Context
Terminology
- RF = Radio Frequency
- HF = High Frequency
- UHF = Ultra High Frequency
- IR = Infrared
- Light is even higher, but that is handled by the camera and not radios
- Exciter = an antenna that is designed to send energy to a passive RFID tag
Existing Bands
RFID
RF Identifier
- Passive = no battery, typically a tag applied to a inventory item - read range has been 12-15 originally now 30+ feet
- Battery Assisted Passive = typically a monitored sensor that is polled by RF
- Active = has batter and dual antenna - read range 300 feet
- Low Frequency 120 to 150 kHz. - near touch scanning
- HF/NFC 13.56 MHz - range in centimeters
- UHF = 300 MHz to 3 GHz - older
- UHF Gen2 = 860 to 960 MHz - range several meters (works through rain)
NFC
Near Field Communications
- Apple Pay
- Android Pay
- Smart card with build in antenna
- 13.56 MHz
BLE
Bluetooth low energy + battery powered
- Also excited by a stationary antenna that causes the smartphone to respond
- Needs to have an app on a smartphone that is powered up and has bluetooth enabled that responds to the message with a UUID
- Operations at 2.4 GHz at about 70 meters between device and anttenna.
WiFi
Generally used for local internet connections. Can also be enabled by one of the above to send a UUID.
