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A V-band traveling-wave tube (TWT) prevails nowadays as an amplifier device for satellite communication and electronic countermeasures. The folded waveguide (FW) is a promising slow-wave structure for V-band TWT with advantages of high power and considerable bandwidth. A novel FW periodically loaded with right-angled rectangular grooves is analyzed for the purpose of gaining higher power within a...
We consider how to efficiently employ D2D communications for secondary users (SUs) in a cognitive cellular network. In this network, primary users (PUs) transmit via base station normally, while SUs can employ multiple transmission modes. One is to transmit via base station (BS mode), and the other is to employ D2D communication (D2D mode) due to the scarce idle spectrum. The SUs who have the potential...
In this paper, a broadband rectangular patch antenna by using a complementary planar-patterned metamaterials is proposed. It is constructed by irregular cross gaps on the patch and ground respectively. Simulation and optimization show that both the impedance bandwidth and the radiation pattern bandwidth of the antenna are remarkable enhanced to 910 MHz (from 1.61 GHz to 2.52 GHz). Demonstrated to...
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