Switch less Bidirectional RF Amplifier for 2.4 GHz Wireless Sensor Networks
Bidirectional amplifiers in anti-parallel configuration are designed for 2.4GHz ISM (Industrial, Scientific and Medical) band applications. These amplifiers are critical for applications where the transceiver module and the antenna element are physically separated to provide possibly better antenna performance. They can also be used as range extenders. One of the designs employs low-insertion loss RF (Radio Frequency) switches and the other has no switches at all. The amplifiers are DC-fed through coaxial cable that connects the antenna to transceiver unit. In switchless design, +/-3V DC are generated at the amplifier (antenna) side so that negative supply is fed to the unused portion, either PA (Power Amplifier) or LNA (Low Noise Amplifier).