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A broadband rectifying circuit with high microwave-direct current (mw-dc) conversion efficiency is designed based on the voltage doubling circuit. The rectifying circuit consists of a broadband match network, a capacitance, a diode, a dc-pass filter formed by three fan-shaped stubs and a resistive load. The measured results show a maximum mw-dc conversion efficiency of 78.3% at 2.45 GHz centre frequency on a 900 Ω load. When the input power is 15 dBm, the bandwidth of efficiencies higher than 50% is about 57% (1.65 GHz-3.05 GHz). The simulated results agree with the measured ones. The rectifying circuit has the characteristics of simple structure and easy integration, which can be applied in the microwave power transmission systems.

A C-band rectifier with a wide input power range and a broad operation bandwidth is designed based on the voltage doubling circuit model. The circuit consists of a matching network, a capacitance, a packaged diode and a dc-pass filter. The simulated results show that the microwave-direct current (mw-dc) conversion efficiencies higher than 50% are obtained on 650 Ω load within the input power range from 4 dBm to 20 dBm and the frequency band from 4.0 GHz to 6.3 GHz. The rectifier has the advantages of low input power, broad band, low profile and easy integration, which is suitable for the ambient electromagnetic energy harvesting systems.

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