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...

Abstract This article presents a quasi‐Yagi antenna operating with high gain at two frequency bands. Compared conventional Yagi antenna, the proposed is designed by integrating pair of printed split‐ring resonators (SRRs) into layout. The SRRs introduce new resonant band and remains both simulated measured results show that well matched while 6 5.80 dBi GSM1800 ISM2450 bands, respectively. compact efficient achieves so it could be successfully used in various wireless communication radio...

Abstract This article presents a novel multi‐band rectifier utilizing modified hybrid structure for radio frequency (RF) energy harvesting. The proposed consists of junction and three rectifying branches. branches are placed inside the to reduce layout size. is designed GSM‐1800, UMTS‐2100, Wi‐Fi bands. Measured peak efficiency reaches 61.7% at 9 dBm input power level. results show good overall performance on operation bands, efficiency, output voltage, can be used various RF harvesting...

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...

This paper presents a compact Koch fractal loop antenna designed for ambient radio frequency (RF) energy harvesting at GSM1800 band. Novel impedance matching method is proposed by using an embedded metal plane (EMP) within the loop. Comparing to conventional antenna, with EMP has bit lower resonance and input can be easily matched 50 Ohm. The introduced in makes more improves radiation characteristics. performance of been verified simulation measurements. useful variety planar antennas being...

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...

Recently, convolutional neural networks (CNNs) have achieved excellent results in object detection of remote sensing images. However, pure CNN-based models difficulty learning explicit long-range relational modeling due to the inherent locality operations. To solve these problems, we proposed a hybrid architecture for by combining transformers and CNNs. In which backbone network employs Swin Transformer-based FPN, while head comprises FoveaBox classifier regressor. We named model Swin-Fovea...

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...

Abstract In this letter, a wide‐band antenna with dual open rings resonator (DORR) is presented for ambient radio frequency (RF) energy harvesting applications. The proposed designed to harvest RF at DCS1800, UMTS/LTE, and Wi‐Fi bands (1.7–2.65 GHz). DORR produces strong coupling effect leads more current paths, thus contributing wider bandwidth. measured bandwidth from 1.68 2.80 GHz 50% fractional gains are 3.5, 5, 5 dBi 1.83 (DCS1800), 2 (UMTS/LTE), 2.45 (Wi‐Fi), respectively. Moreover,...

This paper presents a dual-band circularly polarized (CP) cross-dipole antenna for GSM900 and DCS1800 bands. By proper design of dipole branches, the reflection coefficient |S11| axial ratio (AR) requirements are simultaneously achieved at both The proposed is compact by using meandering structure. measured impedance band (|S11|<-10dB) 0.94~1.01GHz 1.65~2.04GHz. 3-dB AR 0.93~0.95GHz 1.82~1.91GHz. results show that can resonant radiate wave dual With mechanism, it easy to adjust work other...

An ultra-wideband (UWB) antenna is proposed in this paper. The UWB consists of a couple fan-shaped ground plane with series rectangular slots and gourd-shaped radiating patch. the patch are printed on same side dielectric substrate, co-planar waveguide feeding employed. Which enables have compact structure easy to be integrated. By adding three quarter wavelengths open ended stubs microstrip line, etching symmetrical serrated at both sides patch, can obtain performance. simulation results...

In this paper, a kind of circularly polarized broadband patch antenna with H-shaped metal sheet feeding is proposed. The proposed possesses performances wide impedance and axis ratio bandwidth. made up nested radiation patch, loaded the ground plane cross slot. consist an inner two semicircle patches −45° directional slots, outer ring patch. slot combine loop current to broaden has 3 dB AR bandwidth 13.45% (9.57-10.80 GHz) reaches 88.77% (5.68-14.75 GHz).

An electric and magnetic coupled broadband patch antenna with filtering property was proposed. The proposed is obtained by the coupling among three parallel patches printed on same side of substrate. has bandpass character without integrating circuit, which can generate compact size less loss. Results show that a relative wide frequency band (10 dB bandwidth) from 3.38 to 3.5 GHz (3.4%) good response.

A filtering planar magnetoelectric (ME) dipole antenna is proposed. The proposed ME-dipole made up of a half-wave used as the electric dipole, quarter-wave patch with both ends short-circuited magnetic dipole. and dipoles are placed at same level substrate fed simultaneously. In addition, U-shaped metal plate set below to introduce upper stopband radiation null, symmetric open-ended microstrips printed produce lower null. Thus, expresses good bandpass response. Simulation results declare...