An Impedance Matching Strategy for Micro-Scale RF Energy Harvesting Systems

Mohan, Arun; Mondal, Saroj

doi:10.1109/tcsii.2020.3036850

Cited by 36 publications

(13 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the subthreshold current I D in (3), the exponential term is the dominant part to deteriorate the TC of current reference, thus, a negative TC on V GS is required, as shown in (4).…”

Section: 51mentioning

confidence: 99%

“…With the development of low-power consumption Internet of Things (IoT) smart nodes, self-sustaining power supply for IoT nodes by using energy harvesting technology is a future development trend. Benefiting from its convenient control and contactless power transmission of a far-field radiation pattern, RF energy sources feature huge potential to extend the life of batteries, and the research on RF energy harvesting technology has gradually become a research hotspot in recent years [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A high‐efficiency power management unit with wide dynamic range for RF energy harvesting system

Xie

Zhang

Zhou

et al. 2023

IET Power Electronics

View full text Add to dashboard Cite

A high‐efficiency power management unit (PMU) with wide dynamic range for radio frequency (RF) energy harvesting system is proposed in this paper. A digital zero current switching (ZCS) and a digital maximum power point tracking (MPPT) circuits are adopted. A sub‐threshold current reference circuit and a subthreshold voltage detection circuit are proposed to reduce the power consumption of always‐on control circuits and improve the conversion efficiency at low input power. A dual‐oscillator is designed to extend the frequency range and widen the input power range with optimized power consumption under low‐end band and high‐end band, respectively. Switch size and on‐time are adjusted according to the input power, which optimizes the conversion efficiency in a wide power range. Proposed PMU is implemented in a standard 180 nm CMOS process. The post‐layout simulation results show that proposed PMU can achieve cold‐start at the input voltage of 280 mV, the power consumption to maintain the PMU is only 9.6 nW. The input power range of the PMU is 11 nW–677 μW. When the input power is 50 nW, a power conversion efficiency (PCE) of 65% is achieved, and the peak PCE can reach 93% at 23.5 μW.

show abstract

Section: 51mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A high‐efficiency power management unit with wide dynamic range for RF energy harvesting system

Xie

Zhang

Zhou

et al. 2023

IET Power Electronics

View full text Add to dashboard Cite

show abstract

“…Under a minimum quiescent current of 330 nA, the lowpowered module can pick up 130 mV and 330 mV input voltage for a cold-start and a hot-start, respectively. The module requires a minimum cold-start input power of -30 dBm for a charging operation, and the integrated dc-dc boost converter can attain a practical output voltage of 3.1 V. The embedded battery management module manages the duty cycle of the output power [43]- [44]. The proposed rectenna outdoor measurement setups are presented in Fig.…”

Section: Outdoor Measurement Of the Proposed Rectennamentioning

confidence: 99%

A Dual-Band Ambient Energy Harvesting Rectenna Design for Wireless Power Communications

et al. 2021

View full text Add to dashboard Cite

In this paper, a long-range dual-band rectenna for harvesting ambient radio frequency (RF) energy from GSM/900 and GSM/1800 is presented. Theoretical analysis of the proposed dual-band impedance matching network (IMN) is conducted using a modified Π-section matching network (MN). The RF-rectifier is integrated with a dual-band inverted-F monopole antenna. The rectenna circuit complexity is minimized by introducing a dual-band IMN, which plays a significant role in improving the harvester RF-to-dc power conversion efficiency (PCE). Measurement results of the proposed design achieved a peak RF-to-dc PCE of 12.93% and 8.0% for an input power of -30 dBm at 0.9 GHz, and 1.8 GHz, respectively. The RF harvester ambiance measurement attained an output dc voltage of 0.374 V. The circuit generates 0.747 V using a low-powered bq25504-674 evaluation module (EVM). Thus, adequate energy management of the proposed rectenna can be used to power many low-powered devices from the harvested ambient RF energy.INDEX TERMS RF energy harvesting (RFEH); impedance matching network (IMN); power conversion efficiency (PCE); rectenna.

show abstract

“…The re ected power measurement is used by a microcontroller to compensate for the impedance change of a coil. Automatic or adaptive impedance matching has been extensively explored in the wireless communication domain for mobile phones [15][16][17][18][19], RFID [20,21], and in wireless power harvesting [22,23]. Due to the use of lower frequencies in MRI, most of the hardware is not as compact as in the aforementioned technologies.…”

Section: Introductionmentioning

confidence: 99%

Design of Standalone Wireless Impedance Matching (SWIM) System for RF Coils in MRI

Kandala

Sohn

2022

Preprint

View full text Add to dashboard Cite

The radio frequency (RF) power transfer efficiency of transmit coils and the signal-to-noise ratio (SNR) at the receive signal chain are directly dependent on the impedance matching condition presented by a loaded coil, tuned to the Larmor frequency. Sub-optimal impedance condition of receive coils significantly reduce coil sensitivity and image quality. In this study we propose a Standalone Wireless Impedance Matching (SWIM) system for RF coils to automatically compensate for the impedance mismatch caused by the loading effect at the target frequency. SWIM uses a built-in RF generator to produce a calibration signal, measure reflected power as feedback for loading change, and determine an optimal impedance. The matching network consists of a capacitor array with micro-electromechanical system (MEMS) RF switches to electronically cycle through different input impedance conditions. Along with automatic calibration, SWIM can also perform software detuning of RF receive coils. An Android mobile application was developed to monitor reflected power in real-time and control the SWIM system wirelessly via Bluetooth. The SWIM system can automatically calibrate the coil to a 33 dB return loss in 3 seconds and the SNR was improved by 24% (26.85 dB to 34.15 dB) when compared to a loaded coil without retuning.

show abstract

An Impedance Matching Strategy for Micro-Scale RF Energy Harvesting Systems

Cited by 36 publications

References 15 publications

A high‐efficiency power management unit with wide dynamic range for RF energy harvesting system

A high‐efficiency power management unit with wide dynamic range for RF energy harvesting system

A Dual-Band Ambient Energy Harvesting Rectenna Design for Wireless Power Communications

Design of Standalone Wireless Impedance Matching (SWIM) System for RF Coils in MRI

Contact Info

Product

Resources

About