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As a rule nanoantennas represent shaped nanodipoles placed either in some media or mounted on the planar dielectric substrate. In this paper we propose some designs which are new for nanoantennas, namely, shaped silver nanodipoles like a traditional nanodipole and a shaped slotted torus nanodipole are placed on the glass circular cylindrical substrate. In these designs nanodipoles are mounted on the...
A tunable band-stop filter based on coplanar waveguide (CPW) with defected ground structure (DGS) is proposed. Filter structure has DGS-units in the ground plates of the simple CPW transmission line. Resonant frequency tuning achieved with a movement of the metal plates, same size as DGS-units, above the substrate of the CPW line. In down position the DGS-slots are covered by metal plates and filter...
The maximum “recoverable” energy of a small radiator is determined. This energy is defined as the maximum energy that can be recovered from the electromagnetic field distribution in entire space generated by the radiator up to the time point considered. It is shown that the concept of recoverable energy for small radiators leads to a quasi-constant future current. It is also shown that this “recoverable”...
An aperture-coupled wearable antenna with a miniature feeding network is proposed. In wearable systems, it allows to minimize the dimensions of the rigid Printed Circuit Board (PCB) carrying the electronics and feeding the textile antenna, optimizing the comfort of the user. Simultaneously, it avoids probe feeding, that requires a single soldering point that has a huge risk of being broken with time...
A novel button antenna for WLAN applications is proposed. The antenna is composed of a button on top of a dielectric disc. The button is located on top of a textile substrate and a conductive textile ground. This antenna shows two different types of radiation patterns, a monopole type pattern in the 2.4 GHz band and a broadside type pattern in the 5 GHz band, thus both on and off-body function can...
A dielectric waveguide antenna for X-band is designed. A printed dipole fed by a coplanar strip excites the Ex11 mode inside the dielectric waveguide. The waveguide mode in its turn excites a properly dimensioned patch, which generates the radiation pattern. Simulations are conducted from the stand-alone waveguide up to the complete structure to reveal the coupling and scattering effects between the...
In previous studies, it has been proven that by applying the co-array concept, we can detect the Direction of Arrival (DoA) of more sources with less antenna elements. This paper investigates two parameters that have a crucial influence on the co-arrays' DoA estimation performance in practical tests: near field conditions and a multipath environment.
This paper proposes a low-profile patch antenna with pattern diversity, by combining an annular ring together with a center-fed circular patch. The dual-band operation is realized by loading a type of planar metamaterial, i.e. a composite right/left-handed transmission line (CRLH-TL) on the patch. The outer ring and inner circular patch can provide broadside and omnidirectional radiation patterns,...
A wearable antenna with tripolarization diversity is designed in the 2.4 GHz band. An inductive loaded circular monopolar patch with a microstrip annular ring are combined to realize the tripolarization. Simulated and measured results yield a sufficient bandwidth for WBAN. The port isolation reaches 13.5 dB, and the correlation coefficients indicate a good diversity.
In this paper, we present a novel exploration of spatial separation of closely-located users by a massive MIMO system in line-of-sight (LoS) for both an anechoic chamber and an indoor corridor propagation environments. A distributed massive multiple-input multiple-output (DM-MIMO) system powered by software defined radios (SDRs) has been used for the measurement campaign. For the user separation study,...
The goal of this paper is to provide the reader with a good understanding on the effects of truncation (errors) in EMI Near-Field probe compensation techniques using Plane Wave Expansion (PWE). In this paper, the truncation error is analytically calculated for a single plane wave measured in the XY-plane. The influence of this error is calculated for the divergence of the electric field used in vector...
Nowadays nanotechnology allows us to size down every single object in our daily life at the nanoscale. Especially, conventional microwave antennas/scatterers are reproduced at nanoscale and have found many applications, including bio-sensing [1], energy harvesting [2], nanoscale communications [3, 4], etc. Most recently, a Nanoparticle-on-Mirror (NPoM) topology with a sub-nm gap size (See Fig. 1,...
This paper proposes a pattern reconfigurable wearable antenna based on a composite right/left-handed transmission line (CRLH TL). By turning switches on or off, the antenna can resonate both at the zeroth-order mode and the +1 mode, yielding a monopole and a patch like radiation pattern, respectively. Both operating modes cover the 2.4 GHz industrial, scientific and medical (ISM) band. The antenna...
A new definition is given for the reactive energy of a radiating device in time domain, leading to a clear physical insight also in frequency domain. In the new paradigm, the recently observed problem of so-called negative reactive energies is easily explained by causality: it takes a finite time for an electromagnetic wave to travel from one part of the device to another. The new definition of reactive...
Frequency-stepped continuous wave (FSCW) radars have been recently investigated in health care aiming at contactless health monitoring. The mono-static radar architecture is of particular interest due to its low cost. However, monostatic radars suffer from the leakage between the transmitter and receiver paths, which can drastically reduce the detection range of the radar. This paper proposes the...
A wearable UWB antenna is proposed and analyzed in this paper, which is totally fabricated with textile materials, except the feeding connector for testing. By implementing a multilayered structure, the antenna obtains a good matching over the whole UWB band while keeping its low profile. The performance of the antenna is unaffected when worn on the human body due to the shielding by the full ground...
This paper presents an overview of the Convened Session of the EuRAAP Working Group on Software at EuCAP 2016. After discussing the context, it introduces the three antennas that are going to be benchmarked this year. The huge difference with the benchmarking activities of last years of the Software WG is that benchmarking will now also involve a comparison with multiple measurements, in a cooperation...
A low profile dual-band antenna based on the magneto-electric dipole concept is investigated on-body. An efficient space-utilization configuration of the conductive textiles and substrate layers ensured the compactness of the structure for on-body application. The two U slots in the dipole combine the electric and magnetic resonances to produce a dual band behavior and wideband characteristic in each...
Thévenin's network representation of a thin planar antenna is derived using the Lorentz reciprocity theorem of the time-convolution type. The relation of the corresponding network quantities to the pulsed electromagnetic (EM) field radiation characteristics is given. The main results are numerically validated using a full-wave EM solver.
This paper discusses the first antenna that will be benchmarked within the context of the Convened Session of the EuRAAP WG on Software at EuCAP 2016 in Davos, Switzerland. It involves the triple-frequency GSM antenna previously studied in 2009, 2013, and 2014. Since the simulations for this antenna are already state-of-the-art, the effort will concentrate on the measurements, The specific goal is...
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