Impedance optimization of wireless electromagnetic energy harvester for maximum output efficiency at μW input power

Nimo, Antwi; Grgić, Dario; Reindl, L.

doi:10.1117/12.914778

Cited by 16 publications

(18 citation statements)

References 20 publications

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“…Zbitou et al [15] presented a Schottky diode based rectifier having an efficiency of 56 % at 20 dBm input power. High conversion efficiency for Schottky diode based rectifiers is also reported in [6,[16][17][18][19].…”

Section: Introductionmentioning

confidence: 85%

“…4a. The difference between the Delon doubler and the Greinacher doubler is that the Delon doubler does not share the input ground with the output ground, whereas the Greinacher doubler shares both grounds [16]. The Delon doubler circuit consists of diodes and capacitors.…”

Section: Delon Voltage Doubler Rectifiermentioning

confidence: 99%

“…2 and Eq. (15)(16)(17). During the calculation of L and C of the matching circuit equivalent reactance of the rectifier (X pD ) is not considered, and only R pD is taken into account.…”

Section: Rf To DC Converter Designmentioning

confidence: 99%

“…This diode circuit converts RF AC input voltage to DC output voltage. Assuming the ideality factor of 1, the current I through the diode can be expressed as [16,24]:…”

Section: Rf To DC Converter Designmentioning

confidence: 99%

“…The performance parameters, including conversion efficiency, and DC output voltage, of a Schottky diode based rectifier depend on various factors including input power level, characteristics of diode, rectifier configuration, and load resistance [16]. Since the amount of input power captured by the antenna in a rectenna is limited by regulatory authorities, and also because of free space path loss between the energy transmitter and the rectenna, losses in surrounding body tissues, impedance mismatch between the antenna and the rectifier, and size limitation of the rectenna, the rectifier should optimally be able to produce high output voltage for low levels of input power [20].…”

Section: Introductionmentioning

confidence: 99%

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RF rectifiers for EM power harvesting in a Deep Brain Stimulating device

Hosain

Kouzani

Tye

et al. 2015

Australas Phys Eng Sci Med

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A passive deep brain stimulation (DBS) device can be equipped with a rectenna, consisting of an antenna and a rectifier, to harvest energy from electromagnetic fields for its operation. This paper presents optimization of radio frequency rectifier circuits for wireless energy harvesting in a passive head-mountable DBS device. The aim is to achieve a compact size, high conversion efficiency, and high output voltage rectifier. Four different rectifiers based on the Delon doubler, Greinacher voltage tripler, Delon voltage quadrupler, and 2-stage charge pumped architectures are designed, simulated, fabricated, and evaluated. The design and simulation are conducted using Agilent Genesys at operating frequency of 915 MHz. A dielectric substrate of FR-4 with thickness of 1.6 mm, and surface mount devices (SMD) components are used to fabricate the designed rectifiers. The performance of the fabricated rectifiers is evaluated using a 915 MHz radio frequency (RF) energy source. The maximum measured conversion efficiency of the Delon doubler, Greinacher tripler, Delon quadrupler, and 2-stage charge pumped rectifiers are 78, 75, 73, and 76 % at -5 dBm input power and for load resistances of 5-15 kΩ. The conversion efficiency of the rectifiers decreases significantly with the increase in the input power level. The Delon doubler rectifier provides the highest efficiency at both -5 and 5 dBm input power levels, whereas the Delon quadrupler rectifier gives the lowest efficiency for the same inputs. By considering both efficiency and DC output voltage, the charge pump rectifier outperforms the other three rectifiers. Accordingly, the optimised 2-stage charge pumped rectifier is used together with an antenna to harvest energy in our DBS device.

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Section: Introductionmentioning

confidence: 85%

Section: Delon Voltage Doubler Rectifiermentioning

confidence: 99%

“…2 and Eq. (15)(16)(17). During the calculation of L and C of the matching circuit equivalent reactance of the rectifier (X pD ) is not considered, and only R pD is taken into account.…”

Section: Rf To DC Converter Designmentioning

confidence: 99%

“…This diode circuit converts RF AC input voltage to DC output voltage. Assuming the ideality factor of 1, the current I through the diode can be expressed as [16,24]:…”

Section: Rf To DC Converter Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations