A 433-MHz Compact Inverse Class-F Rectifier for Biomedical Wireless Power Transmission

A novel methodology is presented for designing compact and high-efficiency dual-band (DB) rectifier with low insertion loss and complexity. The proposed network implements an opposite order of fundamental matching and harmonic control, as compared to the conventional approaches. Specifically, a typical T-type DB fundamental matching network with closed-form formulas is first used to match directly the diode impedance to the 50Ω standard load. As analyzed, this matching circuit consistently generate a perfect DB matching due to the frequency-dependent diode impedance without any additional impedance tuning methods, yielding a low design complexity. Then, a DB harmonic control mechanism is provided by combination of a DB resonator and a 50Ω tuning series line, which can yield precise class-R harmonic termination of second and third harmonics with only a total of three transmission lines leading a low insertion loss. A rectifier is designed, simulated and measured at two target frequencies of 2.45 and 5.8 GHz for verification. The measured results show a peak PCE of 80.6% at 2.33 GHz and 73.1% at 5.65 GHz while having a compact size of 4.6×3.1 cm 2 , indicating achievement of a superior performance with a simplicity of the design process to the other similar designs.INDEX TERMS Microwave rectifiers, wireless power transfer, energy harvesting, DB harmonic control, DB impedance matching, transmission lines, DB resonator.

Section: Introductionmentioning

confidence: 99%

A Novel Structure of Compact and High-Efficiency Dual-Band Rectifier With Low Complexity for Wireless Power Transfer

Nguyen,

Bui,

Seo

2024

“…There are three main losses in the rectifier circuit: diode loss, mismatch loss, and insertion loss from implemented elements [3]. For a well-matched rectifier implemented on the low-loss printed circuit board (PCB), the diode loss can be minimized by harmonic-controlled techniques, namely class C [4], [5], class F [6], [7], inverse class F (class F −1 ) [8], [9], class R [10], [11] or power recycling [12], [13] techniques. The main principle of these methodologies is suppressing the second harmonic component of the diode voltage or current with zero or infinite impedance seen at the diode sides, respectively.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band Rectifier Design With High Efficiency Using Simple Dual Band-Stop Network for Wireless Power Transfer

Nguyen,

Choi,

Seo

2024

This paper presents a novel structure for designing a dual-band (DB) rectifier with high efficiency and compact size for wireless power transfer. The proposed circuit employs a simple dual bandstop network cascaded by only two transmission lines (TLINs) which can yield open-circuit termination simultaneously for the second harmonics of both two separate frequency bands, enabling an efficient DB power recycling mechanism with minimum insertion loss for power conversion efficiency (PCE) enhancement. The closed-form formulas are derived to extract the TLIN parameters with a low complexity. A rectifier based on a Schottky diode model BAT15-03W is simulated and measured for verification at two target operating frequencies of 0.915 GHz and 2.45 GHz. The measured results show peak PCE of 79.2% and 77.8% observed at 0.9 GHz and 2.36 GHz, respectively. Moreover, wide dynamic range for PCE> 50% is equally recorded at both two frequencies with 17.5 dB. Also, the proposed rectifier exhibits a small electrical size of 0.102λ × 0.105λ, indicating advantages in terms of high PCE and compactness, as compared to the other similar designs.INDEX TERMS Wireless power transfer, DB rectifiers, power recycling, harmonic suppression, band-stop networks, DB impedance matching.

“…Moreover, compact size is the general trend of current technology development, therefore, in the rectifier design, size is always a concern. In addition, depending on different applications, the operating frequency and bandwidth requirements of the rectifiers are also other, which can include types of operating frequency such as single-band [7]- [12], multi-band [13]- [18] and broadband [19]- [22].…”

Section: Introductionmentioning

confidence: 99%

A Novel and Compact Design of High-Efficiency Broadband Rectifier for Energy Harvesting and Wireless Power Transfer

Bui,

Nguyen,

Seo

2024

Self Cite

In this paper, a novel and compact structure is presented for designing a rectifier with broad operating bandwidth and high efficiency for energy harvesting and wireless power transfer based on shuntdiode configuration. Specifically, different from the conventional structure of shunt-diode configuration, the proposed structure employs a combination of two diodes and only two transmission lines that lead to a very compact size. The proposed rectifier can be matched to the source impedance when two diode branches have conjugate impedances. The admittances of two branches are analyzed based on the theory that leads to the parameters of two transmission lines can be derived by closed-forms equations. For validation, a broadband rectifier based on Schottky diode BAT15-03W was designed, simulated, fabricated, and measured showing that the rectifier can operate in the fractional bandwidth of 63.9% from 1.64 GHz to 3.18 GHZ with the condition of higher 70% power conversion efficiency or fractional bandwidth of 99.1% from 1.34 GHz to 3.97 GHz with the condition of over 50% power conversion efficiency at 13 dBm input power. Moreover, the size of the rectifier is very compact, it is recorded as only 15 mm × 14 mm. In comparison with the published broadband rectifiers, the proposed rectifier has many advantages such as smaller size and wider bandwidth.INDEX TERMS Broadband operation, energy harvesting (EH), shunt-diode configuration, microwave rectifier, wireless power transfer (WPT).