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In this work, we do an empirical approach to identify 802.11n technology Train to Ground communication specifics in underground applications from an industrial point of view. The equipment for the measurements was located aboard and along a track. The experiments consisted on measuring signal to noise ratio levels and beacon loss along a standard train cycle for physical layer performance assessment...
This paper presents propagation modelling of different on-body and off-body wireless communication scenarios for dairy cows in barns at 2.4 GHz. Based on the obtained propagation models, a WBAN that monitors multiple heath parameters is designed for optimal performances in terms of energy efficiency and packet error rate.
This paper presents a circularly-polarized dual-band antenna for Ka-band satellite communications which operates simultaneously in both civil and military downlink (17.7–21.2 GHz) and uplink (27.5–31 GHz) bands. The antenna is composed of a metallic ridged cavity that is perforated with a crossed-slot. This cavity is excited in sequential rotation through four feeding coaxial cables, thus producing...
In this paper, a single-fed four-panel 4×1 patch array antenna operating at 2.43 GHz with switched beam capability is proposed. The design allows the beam to be switched between four discrete directions giving 360° coverage. The antenna beam is switched over the azimuth plane for Φ = 0°, Φ = 90°, Φ = 180°, and Φ = 270°. The beam control is achieved by using GaN-based HEMT SPDT switches. Only three...
This paper compares performance of the single-frequency floating-intercept (FI) model, the single-frequency close-in (CI) model, the multi-frequency alpha-beta-gamma (ABG) model, and the multi-frequency close-in frequency-dependant (CIF) model at 30 GHz, 140 GHz, and 300 GHz. For comparison purposes, extensive propagation measurements at 30 GHz (26.5–40 GHz), D-band (110–170 GHz), and 300 GHz (300–316...
Results of path loss in typical outdoor environments in two frequency bands identified in WRC15 for future 5G radio systems are presented. These include angular path loss as estimated from the strongest component, the main beam, the back beam and from the synthesized omni-directional beam.
Airspaces worldwide are becoming more heavily used. This includes the use of unmanned aircraft systems, which is rapidly growing. In order to ensure reliable communication for aircraft, the air-ground channel must be accurately characterized. A significant channel impairment that has not been thoroughly studied is airframe shadowing-obstruction of the line-of-sight signal by the aircraft itself. In...
Millimeter-Wave (mmW) communication systems, capable of achieving high data rates thanks to the large bandwidth available in this frequency range, are a promising 5G technology. Studies in this paper investigate the radio propagation channel at 3, 10, 17 and 60 GHz in an Outdoor-to-Indoor (O2I) scenario. Measurements were conducted using a wideband channel sounder to derive channel parameters such...
This paper presents 28 GHz channel measurements in vegetated areas using a directional channel sounder. The measurement campaign was conducted in areas lined with trees similar to a vegetated residential environment on the campus of Korea Advanced Institute of Science and Technology (KAIST) in Daejeon, South Korea. It was found that excess loss in vegetated areas is associated with a saturating trend...
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 preliminary results of medium wave mobile measurements campaigns carried out in a dense urban region in Brazil. The large-scale and small-scale fading were obtained, as well as probability distribution functions of these signals. The results presented here include daytime and nighttime statistics of the mobility measurements results.
The new generation of polymer materials has the facility to conduct electricity, radiate and concurrently be flexible. Accordingly, the possibility of implementation of a flexible antenna opens the door to many interesting applications including body-worn ones. This paper presents the design of a CPW-fed monopole antenna, based on a Carbon coated Cobalt (CCo) charged Polyaniline (PANI). A wideband...
This paper analyzes polarimetric characteristics of power delay profiles (PDPs), cross polarization discrimination (XPD), and received power of specular and diffuse multipath components of indoor MIMO radio channels at 2.45 GHz. Measurements were done in a residential house at two floors levels: “same floor” and “cross floor”. Variations of 5 to 15 dB in PDPs between co-and cross-polar links were...
A 5 m SATCOM radome has been measured at the Saab A15 compact test range. The modifications of the test range, such as including the gimbal axes in the measurement system, are described. Furthermore, different measurement considerations, due to the large sized radome, are discussed and highlighted. Some typical results are also shown. The range was found to have very small drift and excellent repeatability.
In this paper different possibilities for an in-antenna power-combining approach are investigated. The radiation is based on the principle of an integrated lens antenna (ILA), where the primary radiator consists of a slot antenna with two or more excitation elements. The output power of parallel amplifiers can be directly combined in the primary radiator itself without any additional combiner network...
A frame antenna based on the inverted-F antenna (IFA) structure for the LTE (long term evolution) metal-casing smartphone is presented. The antenna uses a frame section along the short edge of the metal casing as the IFA's radiating strip. There are no gaps required at the two side edges of the smartphone. The frame section is connected to a feed circuit board (FCB) to achieve wider bandwidth. With...
A compact LTE frame antenna with a 2-mm narrow metal clearance for the metal-casing smartphone is presented. The antenna requires only a radiating metal frame section of about a half of the short edge of the smartphone. The metal frame section is fed by a radiating feed network, which includes a feed network and two radiating branches. The feed network includes an inductive feed path (L-path), a capacitive...
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...
This paper discusses physical dimensions for a multi probe anechoic chamber based (MPAC) over-the-air (OTA) setup aiming for base station (BS) testing. The target frequency of the simulated massive multiple-input-multiple-output (MIMO) BS arrays is 28 GHz. The assessment is performed with two metrics. The first metric is a new power metric based on assumptions of a code book of fixed beams and planar...
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...
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