Publications by Anja Skrivervik

Related publications (256)

Influence of Uncertainty of Body Permittivity on Achievable Radiation Efficiency of Implantable Antennas-Stochastic Analysis

Design of medical sensor implants is very challenging due to numerous restrictions in terms of size and biological acceptability. In addition, large absorption and reflection of electromagnetic waves in body tissues significantly degrades the communication ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2021

Study of additive manufactured microwave cavities for pulsed optically pumped atomic clock applications

Anja Skrivervik, Emile Jacques de Rijk

Additive manufacturing (AM) of passive microwave components is of high interest for the cost-effective and rapid prototyping or manufacture of devices with complex geometries. Here, we present an experimental study on the properties of recently demonstrate ...

AIP American Institute of Physics2018

Wireless Powering Efficiency of Deep-Body Implantable Devices

Anja Skrivervik, Mingxiang Gao, Denys Nikolayev

The wireless power transfer (WPT) efficiency to implanted bioelectronic devices is constrained by several frequency-dependent physical mechanisms. Recent works have developed several mathematical formulations to understand these mechanisms and predict the ...

Institute of Electrical and Electronics Engineers2022

Radiation Patterns of RF Wireless Devices Implanted in Small Animals: Unexpected Deformations Due to Body Resonance

Anja Skrivervik, Stéphanie Lacour, Mingxiang Gao, German Augusto Ramirez Arroyave, Kangling Wu, James Daniel Rosenthal

One challenge in designing RF wireless bioelectronic devices is the impact of the interaction between electromagnetic waves and host body tissues on far-field wireless performance. In this paper, we investigate a peculiar phenomenon of implantable RF wirel ...

2023

Physical insights and design principles for efficient wireless implantable bioelectronics

Anja Skrivervik, Mingxiang Gao, Denys Nikolayev

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

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

Radiation Efficiency and Gain Bounds for Microstrip Patch Antennas

Anja Skrivervik

This article presents bounds on radiation efficiency and gain for microstrip patch antennas, demonstrating close alignment with the performance of classic antenna designs. These bounds serve as effective benchmarks for assessing antenna performance and eva ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2025

Analytical Model for Calculating Gain Pattern of Antennas Implanted in Large Host Bodies

Anja Skrivervik, Mingxiang Gao, Sujith Raman

This communication presents a method for the fast and accurate estimation of the gain pattern and maximum gain of an implanted antenna including the effect of the host body, under the assumption that the latter is electrically large. The estimation procedu ...

2024

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

Uncertainty Estimation of Achievable Radiation Efficiency of Implantable Antennas

Anja Skrivervik

Designing antennas for implanted medical devices is a very complex task where one needs to tackle inherently large EM absorption in the human tissue and very limited available space for the antenna. In addition, designers need to carefully limit the power ...

IEEE2021

Spherical lens antenna designs with particle swarm optimization

Juan Ramon Mosig, Anja Skrivervik, Benjamin Fuchs, Benjamin Fuchs, Ruzica Golubovic

A design procedure for spherical lens antennas is described. A particle swarm optimization (PSO) algorithm is coupled to a mode matching technique based on spherical wave expansion to analyze the lens antennas. The proposed methodology is applied to three ...

Wiley-Blackwell2010

Analysis of Non-Canonical Body-Conformal Arrays with Polarization Decomposition

Anja Skrivervik, Denys Nikolayev

Conformal phased arrays can be found in many applications due to their ability to fit tridimensional surfaces and, thanks to their scanning performance, can excel planar arrays. However, most of the previously proposed analysis methods can be applied only ...

IEEE2023

A novel, low-profile, vertically-polarized UWB antenna for WBAN

Anja Skrivervik, Jean-François Zürcher, Mohsen Koohestani

This paper proposes a novel, low-profile UWB antenna for wireless body area network (WBAN) applications. The antenna has a polarization perpendicular to the body-free-space interface, which is interesting in order to minimize the coupling into the body. It ...

Institute of Electrical and Electronics Engineers2014

Telemetry system for sensing applications in lossy media

Anja Skrivervik, Francesco Merli, Eric Meurville, Léandre Bolomey

Wireless communications in lossy media encounter growing interest, with applications as telemedicine, ground sensing, remote pipeline sensing, and food quality testing among others. As an application, an autonomous implantable Body Sensor Node for monitori ...

2011

Maximum Radiation Efficiency of an Implantable Antenna: The Role of High-Order Modes

Anja Skrivervik, Mingxiang Gao

A combination of two numerical techniques of computational electromagnetics, namely, method of moments and vector spherical wave expansion, is used to show performance limitations on the radiation efficiency of implantable antennas and to efficiently resol ...

IEEE2023

A 49.8mm2 Fully Integrated, 1.5m Transmission-Range, High-Data-Rate IR-UWB Transmitter for Brain Implants

Anja Skrivervik, Mahsa Shoaran, Mingxiang Gao, Cong Ding

Implantable neural interfaces hold great potential to restore function in individuals impaired by paralysis, limb amputations, or various neurological conditions. The need for precise mapping of neuronal activity across various brain regions and enhancing ...

IEEE2024

Recipes for different tissue phantoms at narrowband and broadband frequency ranges

Anja Skrivervik, Sujith Raman, Adrián Fernández Carnicero

This dataset includes: A PDF document explaining the performed permittivity measurements of different salt solutions (PBS and EBSS) and cell culture media (DMEM, DMEM+10% FBS, RPMI and RPMI + 10% FBS) that are often used in cell culture experiments as well ...

Zenodo2024

Circularly Polarized Transmitarray Antenna for CubeSat Intersatellite Links in K-Band

Anja Skrivervik, Miroslav Veljovic

A circularly polarized transmitarray antenna based on aperture-coupled patches is presented for CubeSat intersatellite-link applications in K-band. The concept of aperture coupling simplifies the design of transmitarray elements, as it omits the need for m ...

2020

Design Concerns for In-body Antennas Based on Frequency Analysis of Fundamental Radiation Limitations

Anja Skrivervik, Denys Nikolayev

Fundamental radiation limitations of in-body or implantable antennas should give us an estimate on the feasibility of some desired system. It was shown that near-field effects and distance to the body - freespace boundary are critical aspects, while the sh ...

IEEE2020

3D-Spiral small antenna design and realization for biomedical telemetry in the MICS band

Juan Ramon Mosig, Anja Skrivervik, Jean-François Zürcher, Francesco Merli

This work presents the design and realization procedure of small implantable antenna for biotelemetry applications. The radiator occupies a volume smaller than 3 cm(3) (without its biocompatible insulation), is well matched within the Medical Implanted Com ...

2009