Publications de Anja Skrivervik

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

ECOSURF SA-9: A Biodegradable Alternative to Triton X-100 for Tissue Phantoms

Anja Skrivervik, Sujith Raman

Tissue phantoms are materials designed to mimic the dielectric properties of biological tissues. This work proposes eco-friendly tissue phantoms of cartilage, cerebrospinal fluid and stomach in the frequency range between 0.4 and 6 GHz. For reaching this p ...

Institute of Electrical and Electronics Engineers2025

Novel 2-D Beamsteerable Rectenna with Improved Power Receptivity for mm-Wave RF-WPT Applications

Anja Skrivervik, Denys Nikolayev, German Augusto Ramirez Arroyave, Amir Mohsen Ahmadi Najafabadi

This paper introduces a novel 2-D beam-steerable rectenna designed for mm-wave RF wireless power transfer (RF-WPT) applications. The 2-D beamsteering capability of the proposed rectenna is achieved by integrating an on-chip 4 × 4 Butler matrix, which is co ...

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

Multibeam dielectric rod antenna for mm-wave wireless power transfer

Anja Skrivervik, German Augusto Ramirez Arroyave, Amir Mohsen Ahmadi Najafabadi

This paper presents a multibeam dielectric rod antenna for mm-wave wireless power transfer (WPT) applications. The proposed solution utilizes its unique multibeam setup which allows the generation of adjustable beams simultaneously, without the need for an ...

2025

Impact of Reader Sensitivity on Miniaturized Chipless Tag Detection

Anja Skrivervik, German Augusto Ramirez Arroyave

This work presents a magnetic near field-based RFID system in which a miniaturized RFID chipless tag of 1.65 mm2 is detected by two RFID readers (#Reader 1 and #Reader 2) of different sensitivity. The two readers are 7.5x7.5 mm2 tunable segmented square lo ...

Institute of Electrical and Electronics Engineers2025

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

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

Multibeam Antenna with Low Beam Squint for mm-Wave 5 G Handset Applications

Anja Skrivervik, Amir Mohsen Ahmadi Najafabadi

In this letter, a novel series-fed periodic microstrip antenna array with reduced beam squint is proposed for the 28 GHz mm-wave 5G band. To mitigate beam squint, the design reduces the dispersion in the unit cell by introducing an L-shaped slot pair on an ...

Institute of Electrical and Electronics Engineers (IEEE)2025

Hedgehog Shell: Multibeam DRA with 2-D Beamsteering for mm-Wave Applications

Anja Skrivervik, German Augusto Ramirez Arroyave, Amir Mohsen Ahmadi Najafabadi

This paper investigates a low-cost method to form a multibeam antenna with 2-D beamsteering capability. The simple feeding method employed in this solution enables the dielectric rod antennas to generate multiple beams in the intended direction simultaneou ...

2025