This study presents a rectifier array with a two-section branch-line coupler for simultaneous wireless information and power transfer (SWIPT). The branch-line coupler-based power recycling technique is introduced to combine two sub-rectifiers to maintain high rectification efficiency within a wide input power range. A U-shaped 2 nd order band stop filter is proposed to reflect a power signal and transmit an information signal to the isolated port of the coupler. A voltage doubler topology is adopted for the sub-rectifiers to minimize the impedance change to the input power. The proposed rectifier array achieves a wide input power range of 13 dBm~32 dBm for a power conversion efficiency (PCE) > 50 %, with a peak PCE of 74.7 % at 2.45 GHz.
This study presents a compact reflection-type harmonic transponder with a wide input power range for battery-less radio frequency identification (RFID) sensors based on harmonic backscattering. Miniaturizing the circuit size of conventional harmonic transponders is difficult because the input and output matching stages are configured separately, and two antennas are used for each port. The proposed harmonic transponder based on a dual-band matching network matches the load simultaneously at the fundamental and second harmonic frequencies over a wide input power range, thus enhancing the conversion gain (CG) with a compact size. For verification, the proposed transponder is implemented in a compact size with dimensions of 19 mm × 17.8 mm. The measured CG of the implemented transponder is maintained at over −10 dB in the wide input power range of −6.4 dBm to 10.6 dBm at 2.45 GHz. Th e harmonic transponder is configured with a dual-band chip antenna and measured in free space to verify whether it is suitable for battery-less RFID sensors. The measured detectable effective distance to the proposed circuit is 6.3 m in free space, with an equivalent isotropically radiated power of 42.6 dBm.
This article presents a rectifier array for wide ranges of input power and frequency. The rectifier array was configured using two sub‐rectifiers and a 3‐dB branch‐line coupler to recycle the reflected input power through impedance mismatch, thereby extending the input power range. The two‐section branch‐line coupler is merged with matching networks to improve the power conversion efficiency (PCE) and operating bandwidth while maintaining a wide input power range. For demonstration, the proposed rectifier array was designed and fabricated. It achieved a PCE higher than 50% within the input power range of 14–33 dBm. The measured peak PCE remained above 50% within a wide frequency range of 1.5–2.7 GHz.
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