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A coil is integrated inside an implanted antenna in order to support inductive charging. The implanted antenna has been designed for wireless data telemetry at 400 MHz region and radiating wireless charging at 915MHz. The antenna-coil system is embedded into a three-layer canonical model of human arm. In the inductive charging case an external transmitting coil is considered while in the radiating...
A compact planar monopole antenna backed by an electromagnetic bandgap (EBG) structure is presented. The antenna is conformal to the human body and is intended for wearable applications in wireless body area networks. It operates at 2.45 GHz, and is fabricated on a 68mm by 38mm by 1.57mm semi-flexible substrate. The performance of the antenna does not degrade with structural bends along both of its...
One of the most relevant challenges of next generation in-body devices consists in enhancing the medical applications of wireless networks qualitatively. The current standard does not allow high data rate wireless connections between implanted nodes. UWB systems have been considered as a potential candidate for future in-body devices. To establish a proper link within UWB, antenna matching should...
In this paper, a flexible directional monopole antenna for wearable head imaging system for stroke detection is presented. To ensure better flexibility for wearable applications, a very thin flexible PET substrate, Melinex 339 with thickness of 75μm is utilized. The size of the antenna is 70mm × 30mm. An array of 8 antennae are arranged in elliptical configuration to follow a human head contour. The...
In this paper the performance of TM21 resonance-mode circular patch antennas embroidered with different stitching patterns is discussed and compared. The goal is to investigate the difference in the performance when the antenna is embroidered with stitches following the antenna current paths as opposed to some simple patterns such as horizontal and vertical ones. This creates an alternative solution...
The wireless link between an implant and an off-body gateway may be difficult to secure due to the fact that electromagnetic waves quickly attenuate as they propagate through human tissues. Depending on the depth of the implant within the body, the signal strength may be quite weak by the time the waves reach the skin. In order to address this problem, a digitally assisted repeater antenna has been...
In this paper a novel design of an UE (User Equipment) antenna for the 60-GHz band is presented. The antenna was realized on LTCC A6M-E substrate to ease a later integration with the RF-chipset on a single module. To satisfy the requirement of a relative bandwidth of 15 % an electrically thick substrate was utilized, which unfortunately leads to an undesired excitation of surface waves. A suppression...
In this paper, new wideband cavity backed aperture coupled microstrip antenna is presented for 79 GHz MIMO radar applications. This designs is based on a sub-arrays consisting of two single elements, which have stacked rectangular patch radiators. A microstrip to stripline transition and a series feeding topology is used to feed the elements. The antennas are manufactured by using a new high resolution...
This letter presents a series-connected patches antenna aperture-coupled by substrate integrated waveguide (SIW), which produces narrowed E-plane beamwidth for improving antenna gain. With this special patch array, W-band multibeam array antenna capable of offering switchable beams in H-plane is designed by means of SIW Butler matrix. The simulation and experiment results show good impedance matching...
This paper presents a new topology for a wire-grid antenna array which operates at 60 GHz. The array consists of ten λg/2 dipole radiators connected via non-radiating connectors. Both radiators and connectors are placed on top of narrow silicon walls. The antenna is fed with a coplanar microstrip lines placed at the other side of the wafer and is connected with its feeding transmission lines using...
A simple and wideband subarray for D-band applications is presented in this paper. The proposed multilayer subarray consists of 2 × 2 cavity-backed slot subarray fed by a ridge gap waveguide transmission line. The simulated results show that the proposed subarray has a relative impedance bandwidth of 22.5% with input reflection coefficient better than −10 dB over the 126–158 GHz frequency band. An...
Professor Per-Simon Kildal passed away on April 21, 2016, after a very short period of illness. He was born on July 4, 1951. He chaired the Division of Antenna Systems of the Department of Signals and Systems at Chalmers University of Technology. He authored an antenna textbook and many journal articles and conference papers. He designed two very large antennas, including the Gregorian dual-reflector...
Professor Per-Simon Kildal passed away on April 21, 2016, at age 65. Since 1989, he was a Professor with Chalmers University of Technology, Gothenburg, Sweden, where he led the Division of Antenna Systems of the Department of Signals and Systems. The life of Professor Kildal was dedicated to Science, Education and Engineering. This paper summarizes these three aspects of his life, starting from his...
Per-Simon's rise to fame started at the Norwegian University of Science and Technology in Trondheim in the late 1970s. In this paper I will reflect on those years and how it may have shaped his career.
In the late 1990's Professor Per-Simon Kildal got the idea that reverberation chambers could be used for characterizing small antennas and mobile devices. Many thought the idea was crazy but he was persistent and worked hard to realize his dream to build a small chamber that could be used by the wireless industry. This paper gives a short history of the research at Chalmers and the creation of the...
In this paper the steps that led to gap waveguide conception are surveyed. The review includes a background analysis as well as a look into the main physics property exploited in the technology and its implications. Finally, applications resulting from the original idea are also reviewed.
This paper describes how the bistatic radar cross section (RCS) experimental setup of the “Centre Commun de Ressources en Microondes” (CCRM) was used to precisely determine various scattering quantities and how we took profit of the large scattering angular range available with this setup. Results on extinction cross section, linear degree of polarization and other scattering quantities of interest...
In this paper we present our advances in the scattering measurement of low electromagnetic signature objects. The targets under test are spheroids of low relative permittivities and of sizes comparable to the wavelength. The measurements were carried-out at the experimental facility of the “Centre Commun de Ressources en Microondes” (CCRM) in a bistatic configuration and using a hard gating noise...
In this paper, a simple electromagnetic model for wind turbine's backscattering is proposed. The wind turbine is modeled as a linear structure made of three rotating wires on which an electromagnetic fields impinges. Since a wind turbine is much bigger than typical radar range resolution cells, just a small part of it is involved in the backscattering for a single resolution cell. An analysis of the...
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...
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