Balanced rectifier using antiparallel-diode configuration

A constant input impedance over input power can be achieved in a typical balanced rectifier but two rectified output voltages need to be summed up using power management modules (PMMs). In this paper a balanced rectifier using an antiparallel-diode configuration is presented. The rectified output voltage can be acquired directly instead of two separate nodes. Hence, a PMM can be removed and the efficiency degradation by the PMM is also eliminated. To retain the constant input impedance, the effect of changing the polarity of a diode is studied. A prototype for proof-of-concept is implemented. Measured S11 is below −23.5 dB from an input power of −20 dBm to 20 dBm. Measured peak efficiency is 56.8% at 2.24 GHz.

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