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A Novel electrically controllable composite right/left-handed leaky wave antennas (CRLH-LWAs) based on liquid crystal (LC) is proposed. Simulation results show the antenna exhibits a simulated beam scanning angle of −47° to +56° over the frequency range of from 11.8 GHz to 13 GHz. A simulated bandwidth from 11.78 GHz to 13.09 GHz is achieved. By steering the permittivity of LC, the antenna presents...
In this paper, we propose an approach to realize substrate integrated waveguide (SIW)-based leaky-wave antennas (LWAs) supporting continuous beam scanning from backward to forward above the cutoff frequency. First, through phase delay analysis, it was found that SIWs with straight transverse slots support backward and forward radiation of the $-1$-order mode with an open-stopband (OSB) in between...
In this paper we present the design of a multilayer absorber designed to perform over a wide frequency band, starting at relatively low frequencies. We design an absorber comprising of 20 layers, in which the material parameters are tapered in an exponential manner. In addition, the absorber itself is physically tapered at an angle so that it resembles a truncated pyramid. It is shown that the absorber...
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