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Multi-beam wideband communication active electronically scanned arrays have power amplifiers with nonlinear responses. Modeling these nonlinear responses is important for accurately determining the harmonics and intermodulation products, since they have their own radiation patterns in addition to the radiation pattern of the fundamental frequency. We compare the Rapp and polynomial power amplifier...
We use Wireless InSite® to calculate the attenuation of an RF signal at GHz for various tunnel diameters and shapes. The attenuation is calculated at 2.4 GHz and a Weilbull distribution is found that fits the propagation model. The propagation characteristics in our examples follow a Rician distribution.
Multibeam phased arrays in communications systems have the ability to transmit multiple signals in different directions. Ideally, the different signals in the different beams would be isolated and not interfere with each other. In reality, the main beams and sidelobes of the multi-beamed array interact and distort the desired signal in a given direction. Isolating the signals in the different beams...
In this paper, a single-phase high-frequency AC (HFAC) microgrid is shown as a novel solution towards integrating renewable energy sources in a distributed generation system. Better utilization of the Microgrid is achieved by solving power flow and power quality issues using p-q theory-based active filtering called universal active power line conditioner and unified power quality conditioner, respectively...
A class-E frequency doubler is presented at 20.8 GHz, the highest frequency reported to date. The circuit has 42.7% drain efficiency and 31.6% overall efficiency for an output power of 7.1dBm and 0.83 dB conversion gain. A maximum gain of 7.18 dB is achievable with 3.4dBm output power and 13.5% overall efficiency. The trade-off between efficiency and conversion gain is optimized by proper biasing...
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