A multiband SSr diode RF rectifier with an improved frequency ratio for biomedical wireless applications

This paper described a four-band implantable RF rectifier with simplified circuit complexity. Each RF-rectifier cell is sequentially matched to the four operational frequencies to accomplish the proposed design. The proposed RF rectifier can harvest RF signals at 1.830, 2.100, and white space Wi-Fi bands between 2.38 to 2.68 GHz, respectively. At 2.100 GHz, the proposed RF harvester achieved a maximum (radio frequency direct current) RF-to-DC power conversion efficiency (PCE) of 73.00% and an output DC voltage V DC of 1.61 V for an RF power of 2 dBm. The outdoor performance of the rectenna shows a V DC of 0.440 V and drives a low-power bq25504-674 evaluation module (EVM) at 1.362 V. The dimension of the RF-rectifier on the FR-4 PCB board is 0.27 lambda(g) x0.29 lambda(g). The RF-rectifier demonstrates the capacity to effectively utilize the frequency domain by employing multi-band operation and exhibiting a good impedance bandwidth through a sequential matching technique. Thus, by effectively controlling the rectenna's ambient performance, the proposed design holds the potential for powering a range of low-power biomedical implantable devices. (BIDs).

Automated summary

This paper presents a four-band implantable RF rectifier with simplified circuit complexity. The proposed rectifier can harvest RF signals at multiple frequencies and achieves high RF-to-DC power conversion efficiency. It demonstrates the potential for powering low-power biomedical implantable devices by effectively utilizing the frequency domain.