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This paper proposes a dual-band conformal antenna which resonates at lower WLAN (2.4 GHz) and high WLAN (5.8 GHz) frequency bands. And for both the bands, the conformal antenna has perfect omnidirectional radiation pattern. The proposed antenna is conformed onto a cylindrical structure of radius 200 mm. And the electromagnetic model and parametric analysis of the proposed antenna is developed in HFSS...
The design of the system is based on ZigBee and the greenhouse environment is detected by a slave computer. The data collected will be transmitted to a host computer to do the specific operation. That is, by displaying and controlling greenhouse parameters in real time, the host computer can realize real-time monitoring and control of greenhouse temperature, humidity, light, air quality and other...
Both localization and synchronization of mobile nodes are of fundamental importance for wireless networks. With the emergence of full-duplex (FD) communication technology, inter-node distances and clock offsets among a set of nodes can be simultaneously obtained through only two frames of communications, thus significantly improving the efficiency of node localization and synchronization. In this...
A novel design of a dual-band microstrip slot antenna with high common-mode(CM) suppression for wireless local area network(WLAN) multiple-input-multiple-output (MIMO) systems is proposed in this paper. The proposed MIMO antenna element consists of a T-shape slot and a inverted U-shape microstrip feed line. The T-shape shot includes both open-ended and short-ended slots. Open-ended and short-ended...
This paper investigates the problem of link scheduling in a single-hop energy harvesting wireless body area network (EH-WBANs) where sensor devices's energy harvesting rates and data rates are spatially heterogeneous and temporally variant. To maximize the channel utilization with the lifetime operation, an adaptive TDMA-based protocol (AT-MAC) is proposed, which is suitable for communication in an...
In Energy-Harvesting Wireless Body Area Networks (EH-WBANs), how to realize a power management strategy to enable lifetime operation is one of the most concern problems. To solve this problem, a feasible solution should be used to manage the harvested energy in sensor nodes in an EH-WBAN. So far, there are extensive studies about this issue for EH-WBANs. Unfortunately, the significant character of...
A novel substrate integrated dielectric resonator antenna (SIDRA) is designed and implemented using two-layer printed circuit board (PCB) process for millimeter-wave applications. The design and simulation of the SIDRA is carried out with the help of Ansoft HFSS. A prototype antenna is fabricated and measured. The return loss, radiation patterns, and antenna gain are presented, and reasonable agreement...
With the development of sensor, wireless mobile communication, embedded system and cloud computing, the technologies of Internet of Things have been widely used in logistics, Smart Meter, public security, intelligent building and so on. Because of its huge market prospects, Internet of Things has been paid close attention by several governments all over the world, which is regarded as the third wave...
In some oil fields, the consumption of electricity and energy was very high because the beam pumping unit worked sustained, expect in the height period of electricity consumption. It increases the burden on the grid and make machines wearied easily when voltage instability. In this paper, we propose a concept of intermittent pumping to beam pumping unit and build a monitoring system of oil wells based...
The purpose of the paper is to develop a microstrip patch designed for dual frequencies of 2.45 GHz and 4.75 GHz. A new design of two circular patches with a small ring slot in the middle to get the dual band operation is proposed in this paper. It is a multiple patch method for getting dual frequency operation with a single feed point. The simulation and measurement were performed and the dual-frequency...
Recent years have witnessed the pilot deployments of audio or low-rate video wireless sensor networks for a class of mission-critical applications including search and rescue, security surveillance, and disaster management. In this paper, we report the design and implementation of Quality-aware Voice Streaming (QVS) for wireless sensor networks. QVS is built upon SenEar, a new sensor hardware platform...
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