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A printed dipole antenna is designed for a 45deg oblique polarized wideband wide-angle scan antenna array, whose work frequency is whole X band, and the scan angle is positive negative 45deg at horizontal direction. Its bandwidth is extended to 50 percent by using a short-circuited probe balun to compensated the feed distribution capacitor and adding a parasitic patch. Because of the parasitic radiation...
A human body model for passive device-free localization (DFL) application is proposed. Unlike active localization methods, in DFL applications, the targets do not need to carry any electronic device since their location is estimated by tracking the target-induced attenuation of the electromagnetic (EM) field generated by a network of RF nodes deployed close by. Based on the scalar diffraction theory,...
The work presents the results of a project concerning the study and the prototypal realization of an innovative low cost module for Structural Health Monitoring (SHM) that would allow the measurement of internal displacements inside civil structures. A set of these sensors could also be part of wide Wireless Sensor Network (WSN). The basic working principle of the sensor is the Hall Effect. This effect...
In recent years there has been a noticeable increase in the interest of the research community in THz technologies and science. This growing interest in the THz gap is somehow driven by the potential applications in a wide range of fields such as security, counterfeit detection, imaging, spectroscopy, etc. However, there is still the need of devices, technologies, or materials that provide the same...
A beam-steerable antenna system that forms unidirectional radiation is presented. A bundle of transmission lines is used for exciting parasitic elements that are circularly arrayed. The beam direction is controlled by leaving a group of consecutive parasitic elements open-circuited, while shorting the remaining parasitic elements to the ground plane. A reconfigurable antenna with a gain of approximately...
With the advent of the new class of radio telescopes as for example the LOw Frequency ARray (LOFAR) and the Square Kilometer Array (SKA) the necessity of using data mining procedures to handle the huge amount of data collected during their observations became crucial. Software design has resulted in a complete shift of methods by which information is collected in the radio frequency domain. Pointing...
A metasurface-based compact wideband circularly polarized (CP) antenna is proposed. The antenna is composed of dual-layer overlapping metasurface coupled by cross-slot through single series stripline feed. A 64-element metasurface-based CP phased array with a scan angle up to 30 degree off the boresight direction shows the gain higher than 22 dBic, active reflection coefficient less than −9 dB, axial...
The Over-The-Horizon (OTH) locating of radiation source can be realized by the troposcatter propagation of electromagnetic (EM) signals. This paper studies the troposcatter signal group delay for target ranging and proposes a modified beamspace MUSIC to estimate the arrival azimuth angle of the troposcatter signal. Finally, the OTH target can be located by the ranging and azimuth angle estimation...
This work presents the design of a broadband modulated scattering technique (MST) probe. The MST probe works in the whole X band 8–12 GHz and achieves an operative range of about 15 meters with a limited amount of power. The communication between the reader and the tag is obtained using the standard EM4102 RFID protocol to keep the compatibility with existing RFID systems. The information is carried...
This work presents the design of a chip-less RFID tag based on surface impedance waveguide resnators and a Van-Atta array. The Van Atta array is aimed at reflected back the impinging electromagnetic wave for every angle of incidence. The information is provided thanks to a set of compact SIW resonators. The antenna array is a four elements patch antenna array with circular polarization. The antenna...
To deliver on the data rate and latency promises of 5G, more spectrum resources below 6 GHz are required. Therefore the regulators are now promoting spectrum sharing. Having access to realtime spatio-temporal spectrum usage information enables efficient decision making and monitoring. This knowledge can be represented in Radio Environment Maps constructed through geolocation aware spectrum measurements...
This paper proposes a broadband circularly polarized antenna that is composed of inverted F and L antennas on the ground plane, and is allocated in a rotational symmetry. The height and diameter of our proposed antenna is respectively 0.10λ0 and 0.33λ0. The relative bandwidth satisfied with VSWR<3 in each band is 10.7% and 6.9%.
This paper presents a non-cooperative space-surface bistatic synthetic aperture radar (SS-BSAR) with a novel image reconstruction algorithm. Exploiting the continuous wave signal from the transmitters of opportunity, the new algorithm produces better imaging performance. Unlike the conventional passive SAR, the image reconstruction is achieved by correlation in time-domain without distinction between...
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