RF module?

An embedded module used in a RF (Radio Frequency)/wireless data transmitting & receiving, which converts a standard data stream from a DTE (Data Terminal Equipment) into radio signals, and also which converts radio signals from other RF modules into standard data for a DTE.

All users want products that they can use easily, that offer good performance and that are low priced. In other words, they would like to buy radio equipment at low cost that can be used without a radio operator license, with simple, error-free operation over a wide communication range.

RF modules make up the portion of this sort of radio equipment that uses high frequencies.

What type of RF modules are there?

• By type of module
• Tx only / Rx only / RTx
• By frequency band
  • ISM bands (Industrial, Scientific, Medical)
  • 434 MHz band, 868 MHz band (Pan European)
  • 902~928 MHz band (USA)
  • 2.4 GHz band (Worldwide)
  • 424 MHz band, 447 MHz band (Korea)
  • 426 MHz band, 429 MHz band (Japan)
• By digital modulation system
  • FSK (CPFSK, MSK, GMSK), PSK (BPSK, QPSK, DQPSK), and ASK.
  • Usually FSK / ASK
• By frequency channel used
  • Single (Crystal) or Multi (Synthesized)
• By data transmission rate (bit rate)
• 1200bps, 2400bps, 4800bps, 9600bps < 19200bps, 38400bps…
  

• Why are RF modules necessary?

• Time to market
• Cost efficiency
• Legal regulations
• No technical acknowledgement