Anja Skrivervik

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Permittivity Sensors Based on Conventional and Complementary Split Ring Resonators

Anja Skrivervik, German Augusto Ramirez Arroyave

This work presents some considerations for the use of a Split Ring Resonator (SRR) and its dual structure, the Complementary Split Ring Resonator (CSRR), as permittivity sensing elements. The analytical circuit equivalents of both resonators are reviewed i ...

Institute of Electrical and Electronics Engineers2025

Wireless Powering for Long-Lasting Deep-Body Bioelectronic Devices: Solutions, limitations, and new technologies [Bioelectromagnetics]

Anja Skrivervik

Institute of Electrical and Electronics Engineers (IEEE)2025

Estimating the Mutual Coupling of Microstrip Patch Antennas on Large Platforms Through Ray-Tracing

Anja Skrivervik, German Augusto Ramirez Arroyave, Hannes Bartle

The mutual coupling between antennas is an important parameter in multi-antenna systems that needs to be controlled in order to ensure the performance of all involved components. While full-wave simulations are accurate in estimating the mutual coupling, t ...

IEEE2025

Narrowband and Broadband Liquid Phantoms of Gastrointestinal Tissues

Anja Skrivervik

Wireless capsule endoscopy (WCE) has emerged as a promising alternative to traditional endoscopic procedures. However, these systems cannot be accurately assessed due to the lack of affordable and readily available gastrointestinal tissue phantoms. With th ...

Institute of Electrical and Electronics Engineers Inc.2025

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

Low-Profile Fully Metallic Lens Using Higher Symmetries Structures

Anja Skrivervik

This paper presents the design and synthesis of a fully metallic, low-profile flat lens that utilizes twist symmetry structures to control wave front, while minimizing the thickness. Higher-symmetry metasurfaces enable enhanced phase manipulation, broadban ...

Institute of Electrical and Electronics Engineers Inc.2025

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

Modified Huygens Source for Maximum Gain of Implanted Antenna

Anja Skrivervik, Jiajun Li

Implanted antennas are a key part of wireless implanted medical devices. However, the lossy nature of the surrounding body tissue significantly reduces their radiation efficiency and gain. Therefore, it is important to maximize the power reaching free spac ...

IEEE2025

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

Design of a novel wide-angle Rotman lens beamformer for 5G mmWave applications

Anja Skrivervik

The attachment of 5G with millimeter wave (mmWave) frequencies offers massive capacity and low latency to reveal the full 5G experiences. High directive gain and beamforming are considered essential for mmWave 5G systems. The main requirements of the beamf ...

Nature Portfolio2024

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Wireless Powering for Long-Lasting Deep-Body Bioelectronic Devices: Solutions, limitations, and new technologies [Bioelectromagnetics]

Anja Skrivervik

Institute of Electrical and Electronics Engineers (IEEE)2025