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This article presents the design and experimental results of a continuous-time (CT) sigma-delta (ΣΔ) flexible modulator and low noise amplifier (LNA) with data-weighted average (DWA) technology. An image-reject low noise amplifier is designed for wireless tracheostomy tube and bio-signal acquisitions. An inter-stage T-structure filter is used in the low noise amplifier design to bending antenna. The...
Several thousand sensors hard-wired to data acquisition units may be used to instrument a gas turbine engine during its development phase. This process of hard-wiring is time-consuming, expensive, and inflexible. A wireless sensor network (WSN) is proposed as a solution for selectively replacing wired sensors with wireless sensors and for adding new sensors. The WSN shall operate between the engine...
We present a steerable 60 GHz band multibeam antenna for high-capacity 5G hot-spot-scenarios. The developed SIW-LWA-antenna provides about 40° beam steering and a 14 dBi H-plane directivity. Wireless transmission to multiple users and maximum user data rates up to 6 Gbit/s are demonstrated.
This paper presents a millimeter-wave (mmWave) wideband sliding correlator channel sounder with flexibility to operate at various transmission rates. The channel sounder can transmit and receive up to 1 GHz of RF null-to-null bandwidth while measuring a 2 nanosecond multipath time resolution. The system architecture takes advantage of field-programmable gate arrays (FPGAs), high-speed digital-to-analog...
In this effort, the authors present the first demonstration of a flexible, inkjet-printed mm-wave rectenna. The design considerations and processes of the individual antenna array and rectifier are described, demonstrating a realized gain of 5 dBi, and a single-lumped-component via-less rectifier with up to a 2.5V dc voltage for an input power of 18 dBm, at the operation frequency of 24 GHz. The printed...
The purpose of this project is to show the biological effects of the wireless smart meters on human body. There are lots of EMR sources in the world. Especially in home appliances some all electrical appliances emit EMR. The EMR has lots of effects over human biology. Most of the appliances are used rarely in the living places. However, smart meters works continuously during the day. Although, the...
In this paper, the application of metamaterial-loaded Vivaldi antenna in RF energy harvester is presented. The associated Vivaldi antenna was loaded with anisotropic zero-index metamaterial (ZIM), which was designed to enhance the radiation gain. Measured results show that the radiation gain of the antenna with the anisotropic ZIM was improved by 1.2 dB to 8.37 dBi at 2.45 GHz and the measured −10...
The development of the electronics during the recent years aims at producing smaller devices with a very high integration, very energy efficient and cost-effective. There is also a tendency that every device should have such communication modules, so that it can connect to the cloud network which is evolving every day. Designing several different antennas into one single PCB, which is small in size,...
This paper introduces a polarization reconfigurable antenna with multiple slot radiators for body-centric wireless communication system (BWCS). The proposed multi-slot antenna generates switchable 0°, +45°, 90° and −45° linear polarizations to overcome multi-path distortion and polarization mismatching in the communication environment with complex wireless channels as BWCS. To realize this reconfigurable...
Estimating in-factory radio signal propagation characteristics accurately provides robust communication link configuration in these areas. In line with this purpose, this work here provides propagation path loss measurement results carried out in three heavy industrial environments at 315, 434, 870 ve 915 MHz frequency bands.
In this paper new method of determining the design rules in a near Field RF energy harvesting system is presented. A novel model of integrated RF near Field energy recycling from smartphone is investigated. The electromagnetic near Field scanning is deployed, the measurement results confirm a high efficiency RF harvesting in near Field zoning within minimum coupling between system antennas.
In this paper, a low complexity microwave based direction finding (DF) system is presented. The proposed system consists of single six-port (SP) circuit integrated with a reconfigurable multiple-input-multiple-output (MIMO) antenna system. The proposed design is a complete integrated solution with DF capabilities for cognitive radio platforms. The design is suitable to be used in compact wireless...
Wearable electronics is often challenged by the extremely reduced space available to the antenna design. This study assesses the impact that the coupling to a large battery has on a small antenna for wearable devices. The coupling mechanism and its potential risks for the Electromagnetic Compatibility (EMC) performance are discussed in detail. Once the battery is placed within an electronic device,...
In this paper, we described a positioning system based on radio frequency identification (RFID) which is suitable for nursing home. Received Signal Strength Indication (RSSI) positioning technology is used to realize indoor location, Global Positioning System (GPS) technology and General Packet Radio Service (GPRS) communication technology are adopted as a supplement for outdoor location. This system...
The complexity of radiofrequency technologies used in smartphones and tablets has considerably increased the need for more efficient Specific Absorption Rate assessment approaches. SAR measurement systems covered by IEC 62209-3 which implement vector near-field techniques appear as the most promising alternatives to legacy robot equipment. While showing the benefits of Maxwellian field reconstruction...
Beam steering and beam shaping with parasitic array antennas pose a suitable alternative to expensive phased array technology. Parasitic array antennas mainly consist of one or few active antenna elements which are surrounded by passive elements. The parasitic reactances of the passive elements can be controlled either by electronic tuning or switching. Doing this in a suitable way different antenna...
Radio-frequency (RF) wireless communications and sensor networks are currently being deployed in coupled reflective spaces commonly found in aviation, shipping, automotive, and warehousing industries. In this work, a general time-dependent RF energy propagation model is demonstrated and validated from channel measurements conducted in the below-deck spaces of a ship. Measurement results indicate that...
For inspecting on the nonlinearity of RF channel, measurements with novel multi-tone excitations are developed based on a vector network analyzer (VNA) and a multi-tone generator. Many differences have been found in both statistical averages and variances of the transmission function. These differences between statistical averages reflect the nonlinearity of RF channel, and the differences between...
The Texas Instruments eZ430-Chronos development kit is a popular wireless platform for researchers, commercial developers, and hobbyists. Built into the form factor of a standard wrist watch, the Chronos is ideal for wireless body area networks (WBANs), indoor localization, and activity detection. Many of these applications requires knowledge of the RF performance of the platform, which has never...
A wide-band 900 MHz to 2.45 GHz rectenna has been developed for Radio Frequency (RF) energy harvesting in the context of outdoors Wireless Sensor Nodes (WSN). Based on simulations of different rectifying circuits, the most appropriate one for low incident power levels has been manufactured and tested with a wide-band antenna. The theoretical analysis, confirmed by measurements, shows that the proposed...
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