scholarly journals Quad-Band Rectenna for Ambient Radio Frequency (RF) Energy Harvesting

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 7838
Author(s):  
Sunanda Roy ◽  
Jun Jiat Tiang ◽  
Mardeni Bin Roslee ◽  
Md Tanvir Ahmed ◽  
Abbas Z. Kouzani ◽  
...  
Keyword(s):  
Power Density ◽  
Urban Areas ◽  
High Efficiency ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Energy Scavenging ◽  
Area Network ◽  
Rf Power ◽  
Frequency Bands

RF power is broadly available in both urban and semi-urban areas and thus exhibits as a promising candidate for ambient energy scavenging sources. In this research, a high-efficiency quad-band rectenna is designed for ambient RF wireless energy scavenging over the frequency range from 0.8 to 2.5 GHz. Firstly, the detailed characteristics (i.e., available frequency bands and associated power density levels) of the ambient RF power are studied and analyzed. The data (i.e., RF survey results) are then applied to aid the design of a new quad-band RF harvester. A newly designed impedance matching network (IMN) with an additional L-network in a third-branch of dual-port rectifier circuit is familiarized to increase the performance and RF-to-DC conversion efficiency of the harvester with comparatively very low input RF power density levels. A dual-polarized multi-frequency bow-tie antenna is designed, which has a wide bandwidth (BW) and is miniature in size. The dual cross planer structure internal triangular shape and co-axial feeding are used to decrease the size and enhance the antenna performance. Consequently, the suggested RF harvester is designed to cover all available frequency bands, including part of most mobile phone and wireless local area network (WLAN) bands in Malaysia, while the optimum resistance value for maximum dc rectification efficiency (up to 48%) is from 1 to 10 kΩ. The measurement result in the ambient environment (i.e., both indoor and outdoor) depicts that the new harvester is able to harvest dc voltage of 124.3 and 191.0 mV, respectively, which can be used for low power sensors and wireless applications.

Printed array antenna with an elephant trunk shape radiating patch for Bluetooth and WLAN applications

Circuit World ◽  
2020 ◽  
Vol 46 (4) ◽  
pp. 355-362
Author(s):  
Yashar Zehforoosh ◽  
Mehdi Zavvari
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Array Antenna ◽  
Power Divider ◽  
Area Network ◽  
Elephant Trunk ◽  
Content Type ◽  
Frequency Bands ◽  
Wilkinson Power Divider

Purpose This purpose of this study is to present a novel four-element array antenna in combination with a modified Wilkinson power divider feeding network. Design/methodology/approach The two covering bands of this planar array antenna are achieved by an Elephant trunk shape (ETS) radiating element; therefore, two frequency bands for Bluetooth (2.4 GHz) and the wireless local area network (WLAN) band (5.15-5.825 GHz) are obtained. Findings An improved design of the power divider with curved corners rather than the sharp edges and certain new modifications in the length of matching stubs are implemented. Originality/value This paper describes an improved four-way Wilkinson power divider with excellent loss of insertion and adequate return loss for all ports and good isolation performance within two frequency bands (2.4 and 5.5 GHz) and when loaded with array components; the modified power divider complies with the design requirements. To comprehend its behavior, numerical and experimental results are provided. The simulated and measured results indicate a proper bandwidth coverage of the suggested antenna, stable radiation patterns and high gain.

Based on VPN Tunnel Technology of Wireless Local Area Network

2012 ◽  
Vol 546-547 ◽  
pp. 1188-1193
Author(s):  
Zhen Jun Luo ◽  
Ying Jiang Zhang ◽  
Juan Qin
Keyword(s):  
High Efficiency ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Area Network

This paper analyzes the wireless local area network existing safety and efficiency problem. It put forward the VPN tunnel technology to solve these problems. Theory explains that it is very the advantages of layer second tunneling protocol in a wireless local area network. This technology is proved to be reliable by Network Simulate 2 tool. It is proved that the technique is the advantage of high efficiency and safety.

scholarly journals A Novel Broadband Monopole Antenna with T-Slot, CB-CPW, Parasitic Stripe and Heart-Shaped Slice for 5G Applications

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7002
Author(s):  
Zhendong Ding ◽  
Hao Wang ◽  
Shifei Tao ◽  
Dan Zhang ◽  
Chunyu Ma ◽  
...  
Keyword(s):  
Radio Frequency Identification ◽  
High Efficiency ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Coplanar Waveguide ◽  
Local Area ◽  
Monopole Antenna ◽  
Maximum Efficiency ◽  
Area Network ◽  
Frequency Identification

This paper presents a novel broadband monopole antenna that was equipped with a bottom semicircle ground structure, a parasitic patch, a T-shaped slot, s transmission line, a parasitic strip, heart-shaped slices and a coplanar waveguide (CPW). The simulation results revealed that the proposed design had a relatively high return loss, a wide bandwidth and high efficiency. A prototype of the proposed antenna with an overall size of 0.94 λ0 × 0.94 λ0 × 0.02 λ0 (λ0 is the free-space wavelength) was fabricated and measured. The measurement results showed that the prototype had a bandwidth of 4.02 GHz (4.69–8.71 GHz) and a relative bandwidth of 60%. Besides, the maximum gain was 3.31 dBi and the maximum efficiency was 91.1% in the range of 5 to 8.5 GHz. Furthermore, it was found that the prototype almost achieved omnidirectional radiation. Its operating frequency band covered those of industrial scientific medical (ISM) (5.725–5.850 GHz), the radio frequency identification (RFID) (5.8 GHz) and the wireless local area network (WLAN) (5.15–5.25 GHz and 5.725–5.825 GHz).

scholarly journals Design of a MIMO Antenna with High Gain and Enhanced Isolation for WLAN Applications

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1659
Author(s):  
He Peng ◽  
Ruixing Zhi ◽  
Qichao Yang ◽  
Jing Cai ◽  
Yi Wan ◽  
...  
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Ground Plane ◽  
Correlation Coefficients ◽  
Local Area ◽  
High Gain ◽  
Dual Band ◽  
Area Network ◽  
Frequency Bands ◽  
Mimo Antenna

A multi-input multi-output (MIMO) antenna for wireless local area network (WLAN) applications operating in 2.4 GHz and 5.8 GHz frequency bands is proposed in this paper. The proposed dual-band MIMO antenna is composed of two symmetrical radiation elements, and the isolation performance is improved by adopting parasitic elements and a defective ground plane. The measured reflection coefficients are less than −10 dB in the bandwidth range of 2.12–2.8 GHz and 4.95–6.65 GHz, respectively. The measurements show excellent isolation of −21 dB and −15 dB in both desired frequency bands, respectively. The total peak gain is greater than 4.8 dBi. The calculated envelope correlation coefficients (ECC), based on the measured S-parameters, are smaller than 0.01 and 0.024 in the lower and higher frequency bands, respectively. The dimension of the presented antenna occupies 50 × 40 × 1.59 mm3. It is suitable for IEEE 802.11 a/b/g/n (2.4–2.4835 GHz, 5.15–5.35 GHz and 5.725–5.85 GHz) WLAN applications.

Link-Level Simulator for Wireless local Area Network

2018 ◽  
Vol 6 (7) ◽  
pp. 314
Author(s):  
Chaithra. H. U ◽  
Vani H.R
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area Networks ◽  
Local Area ◽  
Long Term Evolution ◽  
Wireless Local Area Networks ◽  
Area Network ◽  
Network Simulator ◽  
Term Evolution

Now a days in Wireless Local Area Networks (WLANs) used in different fields because its well-suited simulator and higher flexibility. The concept of WLAN  with  advanced 5th Generation technologies, related to a Internet-of-Thing (IOT). In this project, representing the Network Simulator (NS-2) used linked-level simulators for Wireless Local Area Networks and still utilized IEEE 802.11g/n/ac with advanced IEEE 802.11ah/af technology. Realization of the whole Wireless Local Area Networking linked-level simulators inspired by the recognized Vienna Long Term Evolution- simulators. As a outcome, this is achieved to link together that simulator to detailed performances of Wireless Local Area Networking with Long Term Evolution, operated in the similar RF bands. From the advanced 5th Generation support cellular networking, such explore is main because different coexistences scenario can arise linking wireless communicating system to the ISM and UHF bands.

PERANCANGAN ANTENA MIKROSTRIPRECTANGULAR

Jurnal Teknik ◽  
2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Heru Abrianto
Keyword(s):  
Dielectric Constant ◽  
Patch Antenna ◽  
Wireless Lan ◽  
Microstrip Antenna ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Area Network ◽  
Dual Polarization ◽  
Feeding Technique

Microstrip antenna which designed with dual feeding at 2.4 GHz and 5.8 GHz can meet WLAN (Wireless Local Area Network) application.Antenna fabrication use PCB FR4 double layer with thickness 1.6 mm and dielectric constant value 4.4. The length of patch antenna according to calculation 28.63 mm, but to get needed parameter length of patch should be optimized to 53 mm. After examination, this antenna has VSWR 1.212 at 2.42 GHz and 1.502 at 5.8 GHz, RL -13.94 dB at 2.42 GHz and -20.357 dB at 5.8 GHz, gain of antenna 6.16 dB at 2.42 GHz and 6.91 dB at 5.8 GHz, the radiation pattern is bidirectional. Keywords : microstrip antenna, wireless LAN, dual polarization, single feeding technique

IEEE 802.11 Tutorial

2018 ◽  
Author(s):  
Kiramat
Keyword(s):  
Access Control ◽  
Ieee 802.11 ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Physical Layer ◽  
Media Access Control ◽  
Area Network ◽  
Media Access ◽  
Computer Communications

IEEE 802.11 is a set of media access control (MAC) and physical layer (PHY) specifications for implementing wireless local area network (WLAN) computer communications. Maintained by the Institute of Electrical and Electronics Engineers (IEEE) LAN/MAN Standards Committee (IEEE 802). This document highlights the main features of IEEE 802.11n variant such as MIMO, frame aggregation and beamforming along with the problems in this variant and their solutions

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