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In this work, we propose the design and implementation of a 13.56 MHz GaN Class-E power amplifier, which takes into account transistor parasitic effects. The design uses the parasitic capacitance of the transistor to replace the charging capacitance, simplifying the circuit structure and obtaining a 93.6% efficiency at output power of 26.8 W. In addition, a wireless power transfer system using the...
New efficiency-improving technique applicable for all types of shunt-diode rectifier is presented. The proposed technique using a harmonic-termination circuit improves the efficiency of conventional shunt-diode rectifiers by nearly 10% at 13.56 MHz. The efficiency of a shunt-diode rectifier was analyzed by using Fourier transform and it is concluded that the efficiency loss can be significantly reduced...
Wireless Mesh Networks (WMNs) has been attracted significant attention due to achieve a wide-area wireless environment with flexible-configuration and low-cost properties. When WMNs is used as an infrastructure for Internet access, all network traffic from mesh routers will be forwarded to the gateways that are directly connected to the wired network. Communication in large-scale wireless networks...
In this paper, we investigate the Access Point (AP) deployment problem in Wireless Surveillance Systems (WSSs). Cameras in a WSS could have various demanding upload streaming rates to the AP (usually deemed as a sink or data collector) according to their surveillance requirements, e.g. object detection frequency, video resolution, or the successful ratio of object tracking. Therefore, a suitable AP...
Current works on the joint routing and channel assignment (JRC) problem in wireless mesh networks (WMNs) assume that all links operate at the base rate. In other words, they do not consider the presence of multiple bit-rates. However, in multi-rate WMNs, the achievable throughput of a link operating at higher rates could be much less than its bit-rate when it has to contend with low-rate links. This...
An RF transceiver for operation near 24 GHz with an onchip antenna, fractional-N synthesizer and other RF and analog baseband circuits is demonstrated in 130-nm CMOS. A 5-m wireless link was demonstrated using a transceiver pair. A technique for wireless calibration of an on-chip frequency reference is also demonstrated.
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