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Two wireless communication technologies commonly used in smart home networks, namely Wi-Fi b/g and Bluetooth operate in the ISM 2.4 GHz band. Channel usage on Bluetooth and Wi-Fi amidst interference conditions to identify potential white spaces in the 2.4GHz range, at any instance was measured. We identified a possible white space frequency range above 2.48 GHz which could be used by either Wi-Fi...
Water is a scarce and valuable resource hence proper management of this resource is essential for social and economic development of any country because it is an input to almost all production in key sectors like Agriculture, Industry, Energy and Transport. Smart devices have transformed nearly every aspect of our home and this paper is presenting a practical low-cost Smart Water Meter Device which...
For rural areas, wireless is the only viable alternative for providing affordable telecommunications services. One limiting factor to the growth of wireless broadband penetration is the lack of available spectrum. White Spaces broadband uses gaps in spectrum bands that have been reserved for TV broadcasts. These frequencies offer significant capacity to help alleviate pressures on existing wireless...
In this paper, we describe an RF energy-harvesting circuit printed on a single FR4 substrate to ensure compact and low profile design at 2.1 GHz. The circuit integrates a notched Circular Microstrip Patch Antenna (CMPA) with a fully matched single diode rectifier to form an efficient rectifying antenna. By cutting two electrically small triangular notches, at 45° and 315° of the patch, it is possible...
This paper proposes a dual-band rectifier circuit that uses Schottky diodes to convert DTV signals (470 - 770 MHz) and tag reader signals (950 - 956 MHz) to DC voltages for passive tag activation and enhanced range operation. Converted DC voltage in the presence or absence of tag reader is investigated in Agilent's ADS simulator under multi-tone or single tone excitation, respectively. Generally,...
This paper presents a batteryless transmitter for wireless sensor systems. Unlike the conventional battery powered sensor transmitters, our proposed transmitter is powered from a cellular energy-harvesting circuit, a microwave energy transmission technique that has capacity to harvest 3.2 V in 5.5 hours at 0 dBm of incident cellular signals (2 GHz). The transmitter is built around a 2.4 GHz nRF24L01+...
We have in this paper, reported on the investigation and validation of the existence of parasitic phase shifts. The cases of HEMT FHX35LG in [4] and E-pHEMT MGA53543 were used for validation, where in both cases; similar phase shifting behaviour was exhibited. This behaviour was exploited for a pre-liminary design of a small linear antenna array. Future work will involve array structures with more...
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