Publications by Anja Skrivervik

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Since its introduction the fidelity concept has been used to evaluate the time behavior of UWB antennas. However, fidelity has been employed with different meanings. This paper clarifies the differences between fidelity factor, system fidelity factor, and ...

This work investigates the measurement of electrically small implantable antennas. Several radiators have been analyzed showing the importance of the feeding coaxial cable that is usually used for testing purposes. Simple solution to the problem is present ...

In this paper, a novel feeding method for shorted annular ring (SAR) antennas is presented. SAR antennas can be designed to not excite surface waves and hence have desirable properties for many applications. The traditional method of feeding a SAR is throu ...

This work presents a low cost and wire-bonded active phase shifter chip to RF circuitry on PCB board packaging for implementing a two-element phased array antenna at 77 GHz. The 1.5 mm × 1.1 mm chip is embedded in RO3003 PCB board and its GSG ports are wir ...

Wireless implantable bioelectronics and accurate in vivo characterization of path loss require efficient and robust in-body antennas. Loading electric antennas with the effective permittivities higher than that of surrounding tissues is a promising solutio ...

Retlectarray (RA) and transmitarray (TA) antennas that use the element-rotation technique require the radiation from the feeding antenna to be circularly polarized (CP). A CP axially corrugated horn antenna is developed as a feeding element for CubeSat RA ...

Antennas are an important element of Wireless Body Area Network equipments, as the quality of the antenna and its coupling to the channel will be a key component of the quality of the overall link. Indeed, the antenna and its interaction with the body of t ...

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 ...

The aim of this contribution is to assess the potential of using various microstrip radiating elements excited with different modes to achieve wide pattern beamwidths. The proposed antenna is made in classic microstrip technology and consists of a circular ...

The viable and safe application of wireless power transfer for powering bioelectronic implants requires understanding the wave propagation in heterogeneous and dispersive media, the electromagnetic exposure assessment, and the optimum design of the system ...

An accurate material characterization method for microwave printed-circuit-board substrates is proposed by combining the microwave ring resonator method with iterative full-wave simulations. A detailed error analysis is performed quantitatively to compensa ...

Planar microstrip resonators suitable for material characterization application are presented in this paper. The prototype consists of three resonators fed through four ports in a planar dielectric substrate without any additional resonators. The resonator ...

Wireless data communication could improve the performance and reliability of biomedical implants used in fundamental neuroscience research by removing infection-prone transcutaneous cabling. The small size of common research animals like mice and rodents, ...

The main purpose of the System Fidelity Factor (SFF) is to incorporate frequency and time domain characteristics of an antenna system into a comparison method for ultrawideband (UWB) antennas. The SFF is an interesting tool because both simulations and mea ...

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 ...

The CubeSat nanosatellite standard puts strict limitations on the antenna volume, resulting in a low impedance and axial-ratio (AR) bandwidths of patch antennas. The AR of a circularly polarized patch antenna can be improved with the introduction of a dedi ...

This study reports an experimental study of the system fidelity factor (SFF) of ultra-wideband wireless body area network antennas in an on-body environment. This study also investigates the influence in the SFF because of the antenna polarisation with res ...

In this paper, a 41 x 42.2 mm2 ultra-wide band (UWB) diversity antenna is designed to operate in the frequency band 5.45- 7.45 GHz with the isolation better than 15dB. To achieve omnidirectional coverage pattern diversity is applied. The proposed design is ...

Conformal antenna arrays are able to fit seamlessly on curved 3D-shaped surfaces, which are found ubiquitously on vehicles, aircraft, a human body, etc. In addition, conformal structures can overcome the scan loss limitations of conventional planar arrays. ...

Anja Skrivervik

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Fidelity concepts used in UWB systems

Design and measurement considerations for implantable antennas for telemetry application

Improving the radiation characteristics of shorted annular ring antennas through symmetric aperture-coupled feeding

Two-Element Antenna-Active Phase Shifter Packaging at 77 GHz

Dielectric-Loaded Conformal Microstrip Antennas for Versatile In-Body Applications

Circularly Polarized Axially Corrugated Feed Horn for CubeSat Reflectarray Applications

Design rules for efficient compact W-BAN antennas

Low-Profile Fully Metallic Lens Using Higher Symmetries Structures

Broadbeam microstrip patch antenna using higher order modes

Use of the harmonic direction finder to study the terrestrial habitats of the European tree frog (Hyla arborea)

Theoretical Efficiency and Dosimetry of Buffered On-body Transmitter Antennas for Wireless Powering of In-body Devices

Characterization of Microwave Substrates for High Accuracy and Long-Term Stability Using Full-Wave Microstrip Ring Resonator Method

4-Port Microstrip planar resonator for multiband microwave material characterization applications

Radiation Performance of Antennas Implanted in Small Animals for Neuroengineering

System Fidelity Factor: a new method for comparing UWB antennas

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

A Comparison of Three Feeding Networks for CubeSat L/S-dual-band Stacked-Patch Antennas

System fidelity factor evaluation of wearable ultra-wideband antennas for on-body communications

Ultra-Wide Band Diversity Antenna for Omnidirectional Coverage

Rapid Analysis of Arbitrary-Shaped Conformal Beam-Scanning Arrays