scholarly journals Penta‐band antenna for global system for mobile communications/digital cellular system/personal communications service/universal mobile telecommunications system/wireless local area network operation in portable devices

2019 ◽  
Vol 13 (7) ◽  
pp. 930-935
Author(s):  
Murilo H. Seko ◽  
Fatima S. Correra
Keyword(s):  
Mobile Communications ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Portable Devices ◽  
Area Network ◽  
Personal Communications ◽  
Digital Cellular ◽  
Universal Mobile Telecommunications System ◽  
Network Operation

scholarly journals Mapping and Recognition of Radio Frequency Clutter in Various Environments in Australia

2010 ◽  
Vol 56 (2) ◽  
pp. 137-144
Author(s):  
Johnson Agbinya ◽  
Vivian Lee ◽  
Khalid Aboura ◽  
Zenon Chaczko
Keyword(s):  
Radio Frequency ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Ultra Wideband ◽  
Area Network ◽  
Radio Frequency Radiation ◽  
Radio Frequency Spectrum ◽  
Universal Mobile Telecommunications System ◽  
Primary Frequency

Mapping and Recognition of Radio Frequency Clutter in Various Environments in AustraliaRadio frequency spectrum mapping allows determining the radio frequency signatures prevalent within an environment. We address the primary frequency bands used for cellular, wireless Local Area Network (LAN), Universal Mobile Telecommunications System (UMTS) and Ultra-wideband (UWB) communications. The purpose of the experiment presented in this paper is to map the detected radio frequencies within an environment and display the collated data on a graphical user interface. A program identifies the presence of the aforementioned radio frequency signatures and recognizes signal levels which exceed the exposure standards enforced by the Australian Communication and Media Authority. The results assist in the understanding of the ramifications of long-term exposure to radio frequency radiation associated with the continued proliferation of wireless devices.

Transient response of dual-band-notched ultra-wideband antenna

2014 ◽  
Vol 7 (1) ◽  
pp. 61-67 ◽  
Author(s):  
Jagannath Malik ◽  
Parth C. Kalaria ◽  
Machavaram V. Kartikeyan
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Low Cost ◽  
Coplanar Waveguide ◽  
Local Area ◽  
Ultra Wideband ◽  
Dual Band ◽  
Portable Devices ◽  
Area Network ◽  
Network Systems

In the present study, an ultra-wideband (UWB) antenna has been proposed using coplanar waveguide (CPW) feed with dual-band-notch characteristics. Slot-loaded radiator and U-shaped CPW resonator are used for band rejection at 3.5 and 5–6 GHz respectively to reduce interference with existing World interoperability for microwave access and wireless local area network systems. With an extended operating band (measured at 10 dB return loss) the antenna operates successfully over the entire UWB range (3.1–10.6 GHz) with a form factor of 30 × 20 × 1.524 mm3 on a commercially low-cost FR-4 substrate. Experimental measurement results are presented in support of the simulated results for the proposed antenna for practical application. The antenna has been successfully fabricated and measured, showing broadband matched impedance and good omnidirectional radiation pattern throughout the operating bandwidth. Measured time-domain analysis for both the orientations, i.e. face-to-face and side-by-side, yields excellent performance in the open environment scenario. With fairly good and consistent monopole such as omnidirectional radiation patterns in H-plane and linear transmission responses, the proposed antenna is well suited to be integrated within portable devices.

Computer Security and Privacy in Wireless Local Area Network in Nigeria

2013 ◽  
Vol 9 ◽  
pp. 23-33
Author(s):  
P.E. Orukpe ◽  
T.O. Erhiaguna ◽  
F.O. Agbontaen
Keyword(s):  
Computer Security ◽  
Wireless Network ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Access Point ◽  
Local Area ◽  
Security And Privacy ◽  
Portable Devices ◽  
Area Network ◽  
Computing Services

The advent of wireless computing and massive processing power available within portable devices provides organizations with an unprecedented ability to provide flexible computing services on-demand to enable business initiatives and this development has increased the demand for wireless network security, which if unaddressed enables the theft of data, lowers productivity, and causes quantifiable financial losses. Flaws arising from wireless protocol with networking design and implementation errors present challenges to the Wireless Fidelity (Wi-Fi) community of users. In this paper, we attempt to document and classify the flaws in Wi-Fi Protected Setup (WPS), then proving the existence of this flaw with a WPS Pin Cracking Method, and presenting a Reverse Engineering countermeasure to eliminating WPS from an Access Point firmware, including other recommendations to helping the network administrators not repeat the errors that are the root causes of flaws of wireless networking in general from being exploited. By implementing the various techniques discussed in this paper, a better and more secure wireless network will be developed.

scholarly journals A Novel Handoff Necessity Estimation Approach Based on Travelling Distance

2018 ◽  
Vol 7 (2) ◽  
pp. 105
Author(s):  
Jyoti Madaan ◽  
Indu Kashyap
Keyword(s):  
Wireless Networks ◽  
Mobile Communications ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Low Cost ◽  
Heterogeneous Wireless Networks ◽  
Threshold Value ◽  
Local Area ◽  
Considerable Proportion ◽  
Area Network

<p><em>Mobility management is one of the most important challenges in Next Generation Wireless Networks (NGWNs) as it enables users to move across geographic boundaries of wireless networks. Nowadays, mobile communications have heterogeneous wireless networks offering variable coverage and Quality of Service (QoS). The availability of alternatives generates a problem of occurrence of unnecessary handoff that results in wastage of network resources. To avoid this, an efficient algorithm needs to be developed to minimize the unnecessary handoffs. Conventionally, whenever  Wireless Local Area Network (WLAN) connectivity is available, the mobile node switch from cellular network to wireless local area network  to gain maximum use of high bandwidth and low cost of wireless local area network as much as possible. But to maintain call quality and minimum number of call failure, a considerable proportion of these handovers should be determined. Our algorithm makes the handoff to wireless local area network only when the Predicted Received Signal Strength (PRSS) falls below a threshold value and travelling distance inside the wireless local area network is larger than a threshold distance.Through MATLAB simulation, we show that our algorithm is able to improve handover performance.<strong> </strong></em></p>

scholarly journals A Very Compact and Low Profile UWB Planar Antenna with WLAN Band Rejection

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Avez Syed ◽  
Rabah W. Aldhaheri
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Low Cost ◽  
Coplanar Waveguide ◽  
Local Area ◽  
Portable Devices ◽  
Area Network ◽  
Ieee 802.11A ◽  
Notch Band ◽  
Half Wavelength

A low-cost coplanar waveguide fed compact ultrawideband (UWB) antenna with band rejection characteristics for wireless local area network (WLAN) is proposed. The notch band characteristic is achieved by etching half wavelength C-shaped annular ring slot in the radiating patch. By properly choosing the radius and position of the slot, the notch band can be adjusted and controlled. With an overall size of 18.7 mm × 17.6 mm, the antenna turns out to be one of the smallest UWB antennas with band-notched characteristics. It has a wide fractional bandwidth of 130% (2.9–13.7 GHz) with VSWR < 2 and rejecting IEEE 802.11a and HIPERLAN/2 frequency band of 5.1–5.9 GHz. Stable omnidirectional radiation patterns in theHplane with an average gain of 4.4 dBi are obtained. The band-notch mechanism of the proposed antenna is examined by HFSS simulator. A good agreement is found between measured and simulated results indicating that the proposed antenna is well suited for integration into portable devices for UWB applications.

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