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Bluetooth devices intended for use in short-range personal area networks operate from 2.4 to 2.4835 GHz. To reduce interference with other protocols that use the 2.45 GHz band, the Bluetooth protocol divides the band into 80 channels (numbered from 0 to 79, each 1 MHz wide) and changes channels up to 1600 times per second.
A rooftop 1 watt Wi-Fi amp, feeding a simple vertical antenna on the left. Another way of adding range uses a power amplifier. Commonly known as "range extender amplifiers" these small devices usually supply around 1 ⁄ 2 watt of power to the antenna. Such amplifiers may give more than five times the range to an existing network.
ESP32 is a series of low-cost, low-power system-on-chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth.The ESP32 series employs either a Tensilica Xtensa LX6 microprocessor in both dual-core and single-core variations, an Xtensa LX7 dual-core microprocessor, or a single-core RISC-V microprocessor and includes built-in antenna switches, RF balun, power amplifier, low-noise ...
EIRP for IEEE 802.11b/g wireless LAN 20 MHz-wide channels in the 2.4 GHz Wi-Fi/ISM band (5 mW/MHz). Bluetooth Class 1 radio. Maximal output power from unlicensed AM transmitter per US FCC rules 15.219 [14] 19 dBm: 79 mW: 18 dBm: 63 mW: 17 dBm: 50 mW: 15 dBm: 32 mW: Typical wireless LAN transmission power in laptops 10 dBm: 10 mW: 7 dBm: 5.0 mW
In addition to the good design of the amplifier stages, the transmitter's output should be filtered with a low-pass filter to reduce the level of the harmonics. Typically the input and output are interchangeable and match to 50 ohms. Inductance and capacity values will vary with frequency.
Bluetooth 1 modulates with Gaussian minimum-shift keying, a binary scheme, so either modulation choice in version 2 will yield a higher data rate. A similar technology, IEEE 802.15.4 (the wireless standard used by Zigbee ) also relies on PSK using two frequency bands: 868 MHz and 915 MHz with BPSK and at 2.4 GHz with OQPSK.
The basic problem is the amplifying element is dissipating power. Switching Class C amplifiers are nonlinear, but they can be better than 50 percent efficient because an ideal switch does not dissipate any power. A clever design can use the nonlinear Class C amplifier for both gain and as a frequency multiplier.
Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). In the most widely used mode, transmission power is limited to 2.5 milliwatts, giving it a very short range of up to 10 metres (33 ft).