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This paper presents the performance of monopole plasma antenna. The plasma tube is used as radiating element. The antenna is designed and works at different frequencies. To couple electromagnetic signal from the coaxial probe to the plasma column, a coupling system is realized. It permit the tube to radiate in order to design a monopole antenna. The performances of the monopole are given in terms...
The channel measurement and modeling of fading characteristics of 25.5 and 39.5 GHz bands in corridor environment are investigated. An automatic measurement system owning a sufficient dynamic range is designed to overcome the prominent attenuation in the millimeter-wave band. After conducting extensive measurements, large-scale and small-scale fading characteristics are obtained and compared. Good-of-fit...
High Frequency Radio Frequency Identification (HF RFID) system based on Magnetically Coupled Reader Resonator Coils (MCRRC) is reported. The proposed system consists of reader antenna including small resonant coil operating by magnetic coupling with the tag coil. In the proposed system, the reader and tag impedances are modified. The equivalent electrical model is used to express the equivalent impedance...
A 4 × 4 circularly polarized antenna array with a substrate integrated waveguide feed network is proposed in this paper. The array is fabricated using low-cost printed-circuit-board and plated-through-hole technologies. The wideband single element is a modified spiral antenna with unequal arm lengths. The measured −10-dB reflection coefficient and 3.2-dB axial ratio bandwidths are 15.7% and 15%, respectively,...
Magnetic nanoparticles have been recently proposed as a contrast agent for breast cancer microwave imaging. In this communication, we report on the ongoing activities aiming at the feasibility validation of magnetic nanoparticles enhanced microwave imaging. In particular, we discuss the results of some experiments, carried out to deal with the factors that influence the detection limits of the technique...
Near Vertical Incidence Skywave communication solutions are known to be reliable and quickly deployable, but modeling a suitable radio link requires a good prediction of the ionosphere behavior and insights regarding ionospheric propagation. Within the framework of the national PN-II SIRIUS project, the Technical University of Cluj-Napoca has acquired, installed, and employed the NovAtel GPStation-6...
In this paper the quantity of available environmental electromagnetic energy in typical urban scenario is investigated. Measurements of the EM power density were performed at several indoor and outdoor locations. The findings are applied to estimate the available power on typical wearable textile antenna.
This paper presents the extraction of the modes resonating inside a mode-stirred reverberation chamber using the Matrix Pencil method. An increasing time-window technique is investigated as a process to discriminate the true modes and the spurious ones that appear due to the measurement noise.
This paper presents a novel low cost three dimensional near-field scanning system consisting of a near field scanner and a three dimensional magnetic probe which reduces the large scanning time of the existing near field scanning systems and increases the spatial resolution. The paper focuses on the design, calibration and validation of a printed circuit three dimensional magnetic field probe. The...
Metamaterial-inspired near-field resonant parasitic (NFRP) electrically small antennas (ESAs) have been designed and experimentally validated to have not only high radiation efficiencies, but also multi-functionality, large bandwidths, high directivities and reconfigurability. These expanded capabilities have been attained by introducing more complex meta-structures, i.e., multiple NFRP elements loaded...
Recently, contactless landslides prognostication systems using light wave lasers and ultrasonic waves have been researched and developed, but they suffer from deterioration of detection accuracy due to environment resistance. To overcome such difficulty, electromagnetic waves have been focused on, and a system which can detect water contents in hydrated soil by electromagnetic waves has been investigated...
This paper investigates propagation mechanisms that EM side-channel signals experience at different frequencies and proposes models for near-field and far-field propagation of side-channel signals. The near-field propagation is modelled as a field created by an electric monopole (Hertzian dipole) and a magnetic dipole, where the received power is collected using only magnetic components of the EM...
The paper proposes a fast and interpolation-free method for near-field 3-D radar imaging. The scattered data are measured on 2-D planar antenna array with wideband stepped frequency signal. The near-field 3-D imaging procedure is indeed a nonuniform summation problem. Different from the conventional interpolation fast Fourier transform (FFT) method, the proposed method regards the imaging procedure...
Simulated Quiet Zone (QZ) performance of a designed Compact Antenna Test Range (CATR) is validated by QZ field probing. Numerical simulations of CATRs, however, lack of modeling the probe. The receiving antenna which is used in order to evaluate the field in the QZ has an influence on the calculated / measured co- and particularly, on the cross-polar components. The degree of the probe effect depends...
In this paper a frequency coded chipless RFID localization algorithm is proposed. Unlike other techniques, one reader with multiple antennas is used to interrogate, identify and localize the tag. The Received Signal Strength (RSS) technique is used to detect the range of the tag, while Matrix Pencil Method (MPM) is used to calculate the Angle of Arrival (AoA). To validate both techniques a ray tracing...
In satellite communications, the demand for capacity increase is met by the use of higher frequency bands, which however are severely impaired by atmospheric phenomena (rain, cloud and gaseous attenuation, scintillation). In order to study propagation effects for future satellite communication frequencies both in temperate and tropical climates, JOANNEUM RESEARCH carries out two long-term propagation...
In this paper, by equipping with omni-directional antennas and high gain power amplifier in our channel sounder system, the propagation characteristics which de-embed antenna response at 28 GHz and 38.6 GHz are analyzed. The base station height-dependent path loss model is derived by the channel measurement in non-line-of-sight (NLOS) urban micro outdoor scenarios. Furthermore, the path loss models...
This paper presents challenges in verifying the design of a space deployable VHF band orthogonal log-periodic dipole array (LPDA). Due to the construction nature of the antenna, operating frequency band, physical dimensions and 1g environment on ground there are a number of challenges in antenna RF measurements and verifications. These are discussed and presented in this paper.
This paper presents a planar, broadband, electrically-small, circularly polarized (CP), near field resonant parasitic (NFRP) antenna fed by a crossed dipole driver. The driven and parasitic elements are printed on two separate thin substrates, which are stacked together with no air-gap to achieve the compact planar configuration. The technique of introducing meander lines and arrowhead-shaped endings...
With the proliferation of wireless electronic devices such as RFID, In-flight Entertainment (IFE) and Personal Electronic Devices (PED) it is important to understand how these systems interact with one another and flight critical systems onboard aircraft. Overall system performance is also of interest due to the varying system performance based on subcomponent installation locations. This paper describes...
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