This letter presents a compact fractal loop rectenna for RF energy harvesting at GSM1800 bands. First, antenna with novel in-loop ground-plane impedance matching is proposed the design. Also, high-efficiency rectifier designed in to form rectenna. Measured results show that an efficiency of 61% and output dc voltage 1.8 V have been achieved over 12-kΩ resistor 10 μW/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> power density GHz....

In this paper, the results of outdoor RF spectral survey carried out in an urban area Southern China are presented. The motivation work has been attempt to record dataset ambient power radiated by mobile base stations and Wi-Fi hotspots environment so as select frequency bands most suitable for future energy harvesting prototype design. spectrum was undertaken city center Shunde, China, which is one developed cities Guangdong province. Typical places including shopping square a residential...

This paper presents a compact dual-band rectenna for GSM900 and GSM1800 energy harvesting. The monopole antenna consists of longer bent Koch fractal element band shorter radiation GSM1800. rectifier is composed multisection matching network, two rectifying branches, filter networks. Measured peak efficiency the proposed 62% at 0.88 GHz 15.9 μ W/cm 2 50% 1.85 19.1 , respectively. When 25 m away from cellular base station, measurement result shows that harvested power able to batteryless LCD...

Autonomous wearable biomedical sensors enable continuous human body vital signs monitoring with features such as being conformable, mobile, cost-effective and self-powered. In this work, we report on an autonomous multi-positional sensor capable of heart rate blood pressure monitoring. The device concept is based a piezoelectric-charge-gated thin-film transistor (PCGTFT) where polyvinylidene fluoride (PVDF) piezoelectric sandwich structure incorporated amorphous silicon (a-Si:H) dual-gate...

Abstract We present EM simulation results of a high‐density substrate patch antenna integrated with microstrip photonic bandgap (PBG) circuit. It is demonstrated that application such circuit in an active eliminates undesired high‐order frequency harmonics and radiation modes, improves the return‐loss level at fundamental‐mode patch. Optimization PBG periodic element geometry provides filtering wide band. The surface current density on has been calculated illustrating mechanism tuning. noted...

This paper presents the design of UHF RFID read/write (R/W) antenna for variety smart shelf retail applications. Antenna operation is based on EM coupling between open-ended or shorted MS feed line and periodic planar metal strips certain layout. The proposed can be easily customized required volume interrogation. Several prototypes have been designed, produced measured. performance has evaluated in system simultaneous detection arbitrary oriented tagged apparel items placed surface....

The use of radio frequency identification (RFID) technology for the automatic and communication physical parameters with on board integrated sensor attracts vast applications a large scale ranging from mobile healthcare to logistics, supply chains, robotics many others. Recently, RFID tags have been considered in wearable electronics. However, these devices are still empowered by battery. In this paper, we proposed designed self-sustainable tag electronics applications. A polyvinylidene...

The active integrated antenna (AIA) concept has been realized in the design of amplifier front end, which enables its applications novel adaptive systems. To address problem mismatch between element and amplifier, we present matching renditions both gain impedance noise figure minimum impedance. In addition, application these principles is demonstrated ultra-compact helical AIA receiver end for operation at 2.1 GHz. Amplifier simulation measurements have carried out to confirm procedure. It...

In this paper, two types of differential topology rectifier are studied and designed for RF energy harvesting at GSM1800 band 1.83GHz. The proposed serial doubler with odd harmonics suppression characteristics. Radial stubs utilized to filter the output harmonics, which makes more compact. rectifiers Schottky diodes (SMS7630) fabricated on Teflon substrate. Measured maximum efficiencies 49% @ 0dBm 53% 2dBm, respectively. results show that efficient, power sensitive An application scenario...

In this paper, we present a novel impedance matching method for loop antenna by integrating the in-loop ground plane (ILGP). Compact Koch fractal is designed ambient radio frequency (RF) energy harvesting applications at GSM1800 band. Comparing to conventional antenna, proposed ILGP doesn't require any additional layout and can easily match 50 Ohms. The makes more compact provides high total efficiency. performance of has been verified simulation measurements. It should be noted that useful...

This paper presents the design and EM analysis of a near-field RFID antenna for smart shelf applications where spatially-reconfigurable interrogation zone is required. Antenna operation based on coupling between open-ended or shorted microstrip (MS) feed line parallel planar metal strips printed top dielectric layer. The novelty proposed corresponds to utilizing RF switches altering length meander MS thus changing phase distribution radiating elements. Near-field distributions calculated in...

Abstract This paper presents the design of a novel differential voltage octuple rectifier for wireless RF energy harvesting. Two rectifiers with common matching (CM) and two‐branch (TBM) are presented CDMA850/GSM900 bands operation. Measured maximum efficiencies CM TBM reach 66.5% 70.6%, respectively. The results also show that both network‐type can produce higher output voltage. It is demonstrated designed rectifier‐antenna structure powers up battery‐less LCD sensor by harvesting signal...

A T-shaped ring band pass filter using source-load coupled technique is proposed in this paper. structure effectively utilizes the area and makes it easier to tune filter's center operating frequency, which also helpful expanding bandwidth. Source-load used design increase transmission zeros on frequency both sides so that out-of-band rejection can be further improved. First, validation simulation carried out prove use of coupling. Then a demonstrating has been designed, optimized,...

This paper presents the results of measurements Specific Absorption Rate (SAR) distribution produced by UHF RFID reader antenna located close to standard flat phantom. SAR have been carried out SPEAG DASY5 system at 918 MHz for varying distance between and RHCP with 8.5dBic gain connected commercial operating Pout=30dBm has used irradiate Safety levels 10-g averaged not exceeding 2W/kg limit confirmed series measurements. However, it found that maximum values inside phantom are localized in...

The efficiency optimization of a feedforward low distortion power amplifier is presented. Based on the principle compensation, main output power, that subamplifier, and have been accurately derived. In present analysis, coupling coefficient signal paths selected as parameter because it may essentially affect performance. Simulation results obtained for different values cancel ratio adjacent channel leakage power. analysis contributes to design improvement mobile communication base stations.

This paper presents the results of analytical study and numerical simulation as well discusses various microwave applications artificial periodic substrate photonic bandgap (PBG) circuits. The configurations considered are planar microstrip coplanar line circuits on high-density dielectric containing finite-periodic groups air blocks underneath lines. Transmission matrix method has been applied for analyzing transmission/reflection characteristics obtaining stopband passband conditions....

This article presents a new measurement method of evaluating the specific absorption rate (SAR) as part human exposure assessment procedure for radio-frequency wireless power transfer (RF WPT) system operating at 2.45 GHz.SAR distributions measured according to International Electrotechnical Commission standards were obtained and analyzed different locations charging device with respect flat elliptical phantom.RF from under test was assessed by comparing recorded peak 10 g average SAR values...

In this work, electromagnetic analysis of a novel photonic bandgap (PBG) substrate microstrip line circuit is presented and its applications in an integrated antenna amplifier transmitter front end are discussed. The method-of-moments based Sonnet Suite has been used for full-wave 3D simulation the on high-density having rectangular air blocks. It shown that single row blocks consisting only 3-5 elements optimized dimensions produce very steep wide (up to 10 GHz) mode. results obtained...

This demo presents the newly developed Human Body Communication (HBC) technology utilizing NFC contactless communication and electric field coupling. The main advantage of this novel is its ability to provide more human-centric operation as compared a conventional communication. In our demonstrations, two applications are introduced. first one illustration user authentication being realized by shaking hands with doll. type induction coupling utilized. second application demonstrates an Apple...

This paper presents the results of circuit simulation and design a car-based antenna integrated RF filter structure for 3G wideband code-division multiple access (W-CDMA) mobile phone communication system. Printed-on-thin film microstrip layout has been optimized to miniaturize dimensions provide seamless integration with feed line printed-on-glass element. Side-coupled bandpass meet strict passband/stopband specification as well minimize total loss circuit. The dependence transmission...

The concept of wireless power transfer (WPT) for distant powering various electronic devices has received much attention the research community [1]. Recently, WPT technology been actively developed electric vehicle charge applications [2]. According to ICNIRP guidelines, human exposure limits above 100 kHz using specific absorption rate (SAR) as assessment criteria are defined [3]. In safety inductive coupling systems, phantom different shapes and dimensions can be used [4]. It is therefore...