Publications by Mingxiang Gao | EPFL Graph Search

A 49.8-mm 2 IR-UWB Transmitter With Co-Designed Power Amplifier and Antenna for Neural Implants With Extended Transmission Range

Anja Skrivervik, Mahsa Shoaran, Mingxiang Gao, Cong Ding

This work presents an implantable impulse-radio ultrawideband transmitter (IR-UWB TX) optimized for high-density neural recording. To address the tradeoffs between data rate, transmission range, implant size, and power consumption, we propose a novel co-de ...

Institute of Electrical and Electronics Engineers (IEEE)2025

Closed-Form Approximations for RF Radiation from Implantable Medical Devices

Anja Skrivervik, Mingxiang Gao

The radio frequency (RF) performance of implantable antennas is significantly affected by the lossy biological tissues surrounding the implant. This paper introduces an an-alytical method for assessing the gain and radiation patterns of implantable antenna ...

IEEE2025

A Hybrid Method for Optimizing Radiation of Implantable Antennas in Diverse Scenarios

Anja Skrivervik, Mingxiang Gao

This paper presents a combination of three computational methods in a hybrid approach designed to model the radiation of antennas within arbitrarily shaped capsules implanted in a host body. A surface method of moments is employed to represent the radiatio ...

IEEE2025

Cylindrical Phantom Model for Characterization of Implantable Antennas

Anja Skrivervik, Mingxiang Gao

Fundamental radiation limitations for in-body or implantable antennas provide valuable insights into the feasibility of certain systems. Previous work has shown that near-field effects and the distance from the body-to-freespace boundary are critical facto ...

IEEE2025

Physical insights and design principles for efficient wireless implantable bioelectronics

Anja Skrivervik, Denys Nikolayev, Mingxiang Gao

Implantable bioelectronics require highly efficient wireless connectivity for autonomous operation and closed-loop control, yet power constraints, safety regulations, and data transmission limitations continue to hinder advancements in medical device innov ...

2025

Spherical Human Phantoms for Characterization of Implanted Antennas

Anja Skrivervik, Mingxiang Gao

Implantable antennas cannot be characterized by methods suitable for standard antennas because they are embedded in lossy human tissue, which affects the antenna parameters. In this paper, we consider a canonical spherical human phantom which allows us to ...

Institute of Electrical and Electronics Engineers Inc.2024

Link Budget Estimation for Implantable Antennas: From In-Body Coupling to Free-Space Radiation

Anja Skrivervik, Mingxiang Gao, Sujith Raman

In wireless communication systems, the Friis transmission equation is commonly used to quickly estimate wireless transmission efficiency between the transmitter and the receiver. In the case of wireless implantable bioelectronic systems, the gain of the im ...

Institute of Electrical and Electronics Engineers Inc.2024

Maximum Radiation Efficiency of Arbitrarily Shaped Implantable Antennas

Anja Skrivervik, Mingxiang Gao

Performance limitations for implanted antennas, taking radiation efficiency as the metric, are presented. The performance limitations use a convex optimization procedure with the current density inside the implant acting as its degree of freedom. The knowl ...

2024

Electromagnetic Radiation of Implantable Antennas

Mingxiang Gao

In the development of implantable bioelectronics, the establishment of efficient wireless RF links between implants and external nodes is crucial, providing substantial contributions to the advancement of medical diagnosis, therapies, and basic science. Im ...

EPFL2024

Analytic Approximation of Free-Space Path Loss for Implanted Antennas

Anja Skrivervik, Mingxiang Gao, Sujith Raman

Implantable wireless bioelectronic devices enable communication and/or power transfer through RF wireless connections with external nodes. These devices encounter notable design challenges due to the lossy nature of the host body, which significantly dimin ...

2024