Novel Diplexer-based Harmonic Transponder for 5G-Compatible IoT Applications

A novel diplexer-based passive harmonic transponder for 5G-compatible IoT applications is presented in this work. Tx/Rx isolation is obtained through the generation of the 2nd harmonic signal. The proposed architecture design is based on a high isolation diplexer with a single (dual band) antenna as opposed to a traditional design using two-antenna isolation. Such an architecture relaxes the stringent design requirements of antennas in traditional architectures. Subsequently, antennas with enhanced performance can be utilized without resorting to compromise. Measured results of the proposed transponder circuit have shown improved performance over the state of the art counterparts. The conversion loss is about 20.2 dB at -30 dBm input power, which shows more than 10 dB better than previous work.