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A dual-frequency rectifier with adaptive power is proposed for the rectenna of a microwave power transmission system. It operates at 900MHz and 2.4GHz (GSM and ISM bands) on a wide and low input power condition. A FET works as an adaptive switch for changing the working modes of the rectifier according to the level of the input power. A cross-shaped match stub matches the two impedances of the diode...
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...
This paper reports a circularly polarized (CP) rectifying antenna (rectenna) operating at 35 GHz with high microwave-direct current (mw-dc) conversion efficiency. A pair of side-concave patches is used as a CP receiving antenna with a high gain of 10 dB. A low-pass filter (LPF) at the input port of the rectifying circuit is used to suppress the high order harmonics by 19 dB. Both of the antenna and...
A novel stepped-impedance resonator (SIR) and its simplified equivalent circuit are proposed in this paper. The frequency responses of the SIR with different sizes are analyzed by the full-wave electromagnetic (EM) simulator. A novel low-pass filter (LPF) with two transmission zeros is designed and fabricated based on the SIR. The measured 3 dB cutoff frequency fc is 7.2 GHz with 0.3 dB ripple level...
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