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UWB systems have been proposed as a candidate for the next generation of in-body applications. In order to perform reliable UWB channel measurements, implantable antennas should work in the propagation medium properly. To assess the UWB channel performance, in-body antenna matching should be assured. Besides, an omnidirectional radiation pattern in order to communicate with a sensor array located...
Transcutaneous Energy Transfer (TET) is a promising solution to operate implantable mechanical blood pumps such as Left Ventricular Assist Devices (LVAD) without the need for a percutaneous driveline. In order to control the power flow of the wireless energy transfer system and in order to transmit sensor data, a wireless communication channel is needed. This paper describes the design of an implantable...
Three antennas including a printed dipole, a meander antenna and a loop meander antenna operating at 2.46 GHz are presented. They are simulated, fabricated and measured. The results show that the design of meaner antenna and meander loop antenna do expand the bandwidth without increasing the antenna size.
A novel compact dual-polarized unidirectional wideband antenna based on two crossed magneto-electric dipoles is proposed. The proposed miniaturization method consist in transforming the electrical filled square dipoles into vertical folded square loops. The surface of the radiating element is reduced to 0.23λ0∗0.23λ0, where λ0 is the wavelength at the lowest operation frequency for a standing wave...
In the present paper we analyse small-scale fading of reflections at 60 GHz using different antennas and bandwidths. The aim is to investigate the deterministic property of the channel in view of modelling and deployment of systems with larger bandwidths and higher directivity. We have investigated the scattering effect of a reflection on a wall emulating a beam-former in a NLOS condition. The results...
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...
A broadband dual-polarized dual-dipole (DPDD) planar antenna is analyzed and designed for 2G/3G/4G base stations. The DPDD antenna consists of two perpendicularly crossed dual-dipole elements. Each dual-dipole element is comprised of two identical side-by-side dipoles which are connected through a coplanar strip line that also acts as an impedance transformer. Two dual-dipole elements are printed...
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...
By augmenting several classes of metamaterial-inspired near-field resonant parasitic (NFRP) electrically small antennas (ESAs) with active (non-Foster) circuits, we have achieved performance characteristics surpassing their fundamental passive bounds. The designs not only have high radiation efficiencies, but they also exhibit large frequency bandwidths, large beam widths, large front-to-back ratios,...
With the future LTE auction for TV white spaces at 600 MHz, there is a strong need for efficient handset antennas operating at very low frequencies. This paper proposes a tunable antenna design for the low bands of LTE. In this design, not only the antenna is tuned but also the resonance of the board, thanks to using a tunable parasitic. The resulting dual-resonant antenna exhibits a peak total efficiency...
In this paper, a novel ultra-wideband (UWB) printed circuit board antenna with dual band-notched characteristics is presented. The antenna consists of a circular patch with two pairs of the L-resonator. To realize the notch characteristics in WLAN at 5.2 GHz (5.15–5.35 GHz) and 5.8 GHz (5.725–5.875 GHz) bands, the half wavelength of L-resonator is introduced in the radiating patch. The T-shape notch...
This paper describes the design, fabrication and characterization of a 42 GHz compact lens antenna integrated in a backhaul terminal radome. The proposed lens concept relies on the use of hybrid design that mixes a single refractive bulk zone and dielectric structured zones. This allows overcoming usual Fresnel lens efficiency limitations occurring in compact configurations. The antenna is composed...
This paper presents wideband channel measurements in an office environment in the 62 GHz and 83 GHz frequency bands. Measurements were performed with a VNA and the mechanical steering of directive antennas at both the transmitter and receiver side, allowing a double-directional angular characterization. A comparison of propagation characteristics such as the path loss, multipaths clusters' dispersion...
If a channel is frequency dependent then Uncorrelated Scattering (US) (a narrow-band assumption) don't hold. This has a significant impact at the considered channel modeling methodology as delay and angular dispersion of waves can no longer be studied independently because the small scale fading of individual multipath components become correlated. In this paper, we investigate the frequency dependence...
A novel compact size equilateral triangular ring-slot antenna is proposed for microsatellite. The presented antenna utilizes truncation, perturbation, and slits to generate wideband circular polarization (CP) operation from its inherited linear polarization. The fabricated antenna has wide CP performance of 1106 MHz or 52.27% of fractional bandwidth at 2116 MHz center frequency. The measured results...
A wideband U-slot patch antenna with reconfigurable radiation pattern is investigated. The antenna composes three patches which are one coaxial-fed U-slot driven patch and two parasitic patches located near the two non-radiating edges of the middle driven patch. One varactor diode is installed in middle of each parasitic patch. Both beamwidth and main lobe direction can be tuned by controlling the...
The wireless industry is getting deeply engaged in the 5th generation communication standard. Despite lack of clear definitions, there are some parameters of the emerging standard which are commonly accepted. Higher frequencies (frequencies above 6 GHz) in the millimeter wave spectrum will be a key component for enabling a massive increase of the available bandwidth and thus data rates for the end...
This paper presents a wideband pyramidal sinuous antenna, over a conducting ground plane, for use as a reflector antenna feed. Specific attention is given to comparisons with a similar structure where the sinuous shape is instead projected onto a cone. The pyramidal structure is significantly simpler to manufacture, and measured results confirms this where close agreement with simulations is observed.
Flight inspection of radio-based terrestrial navigation systems is crucial for sufficient accuracy. Especially in proximity of wind turbines (WT), which have arisen in recent years due to government subsidies for renewable energies, flight inspections must be carried out. This causes problems that hinder the usage of conventional aircraft: Even rotorcraft (e.g. helicopters) require a certain amount...
The capability of an Autonomous Underwater Vehicle (AUV) or Remote Operated Vehicles (ROVs) to communicate with underwater sensor nodes or a docking station, for the exchange or transfer of data gathered during a survey mission, requires an high-speed short-range communication link. This is important because of the global attention to the underwater communication applications. To this end, underwater...
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