disadvantages of 2.4 GHz wireless module on human body

Overview

The nRF24L01 module is the latest in RF modules from SparkFun. This module uses the 2.4GHz transceiver from Nordic Semiconductor, the nRF24L01+. This transceiver IC operates in the 2.4GHz band and has many new features! Take all the coolness of the nRF2401A and add some extra pipelines, buffers, and an auto-retransmit feature - very nice!

This board features a reverse polarized SMA connector for maximum RF range. And there are PA and LNA circuit on board, with the external antenna it can reach long distance than the one without these parts.

This module comes with the 2.4G antenna (2DB), with 250Kbps transmission rate on open air it can reach the 800-1K meters communication distance.

Note: We now populate these boards with the nRF24L01+. The '+' version of the IC has improved range, sensitivity, and data rates. The command set is backward compatible with the original nRF24L01.

Features

    Voltage: 3-3.6V (recommended 3.3V) V
    Maximum output power: +20dBm
    Emission mode current(peak): 115mA
    Receive Mode Current(peak): 45mA
    Power-down mode current: 4.2uA
    Sensitivity 2Mbps mode in received: -92dBm
    Sensitivity 1Mbps mode in received: -95dBm
    Sensitivity 250kbps mode in received: -104dBm
    PA gain: 20DbLNA gain: 10Db
    LNA Noise figure: 2.6Db
    Antenna Gain (peak): 2Dbi
    2MB rate (Open area): 520m
    1MB rate (Open area): 750m
    250Kb rate (Open area): 1000m