Organization of access to wireless ad hoc networks of information systems for monitoring forest territories from the environment of OS Windows 10

В основе технической реализации современных информационных систем мониторинга лесных территорий лежат беспроводные самоорганизующиеся Ad Hoc сети. Однако, в отличие от ОС Windows 7, доступ к отдельным узлам этой сети с ноутбуков и планшетов, работающих на базе более новой ОС Windows 10, затруднен из-за отсутствия в графической оболочке этой системы возможности работы с Ad Hoc сетями. В настоящей статье предлагается подход для организации такого типа беспроводных подключений, при котором использует внутренние ресурсы ОС Windows 10, доступные из среды ее командной строки, и реализованные в семействе команд netsh wlan. На простейшем примере прямого Wi-Fi соединения двух виртуальных машин с беспроводными USB адаптерами показана работоспособность предложенного подхода и достаточно подробно описана необходимая для этого последовательность действий. The technical implementation of modern information systems for monitoring forest territories is based on wireless self-organizing Ad Hoc networks. However, unlike Windows 7, access to individual nodes of this network from laptops and tablets working on the basis of the newer Windows 10 is hampered by the lack of the ability to work with Ad Hoc networks in the graphical shell of this system. This article proposes an approach for organizing this type of wireless connection, which uses internal resources of Windows 10, available from its command line environment, and implemented in the netsh wlan command family. On the simplest example of direct Wi-Fi connection of two virtual machines with wireless USB adapters, the operability of the proposed approach is demonstrated and the necessary sequence of actions is described in sufficient detail.

Printed Notched Antenna with Long Meandered Line for Eight-Band LTE/GSM/UMTS Wireless USB Dongle Operation

This paper presents a planar notched antenna with a long meandered line for wireless USB dongle applications. The printed notched structure is used as additional resonators to generate multiple bands operation for covering GSM1800/1900/UMTS2100/LTE2300/2500 bands. In addition, with the help of the long meandered line via hole to ground, a lower resonant mode is sufficiently generated at around 770 MHz and forms a wider lower operating bandwidth (LTE700/GSM850/900). Briefly printed on a 0.8 mm thick FR4 dielectric substrate of size 20×70 mm² and electrically connected (via hole) to the ground plane of the USB dongle, the proposed antenna can provide a wide operating bandwidth (3:1 VSWR) of larger than 120 % centered at 2,000 MHz, allowing it to cover 698–960 and 1,710–2,690 MHz bands. The proposed antenna also can be attached to laptop computer by the USB interface. Detailed design considerations of the proposed antenna are described, and obtained experimental and simulation results are also presented and discussed in this paper.

Palm tree structured wide band monopole antenna

This paper presents design, fabrication, and testing of a palm tree structured monopole antenna for wideband applications. The proposed antenna has a wide impedance bandwidth (−10 dB bandwidth) from 4 to 10.4 GHz. Palm tree antenna of compact size 23 mm × 20 mm is designed and fabricated on an FR4 substrate of thickness 1.6 mm. To validate the design, a mathematical relationship between the parameters of the palm tree geometry and the lower cut-off frequency has been established. Parametric study has been carried out to obtain optimum wideband characteristics. The prototype is experimentally validated for the band 4–10.4 GHz within ultra-wideband operations. Transfer function, impulse response and Group delay has been plotted in order to address the time domain characteristics of the palm tree antenna with fidelity factor values. The possible applications cover 5.2–5.8 GHz WLAN, C-band operations, 5.5 GHz WiMAX, and Wireless USB.