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In this paper, A novel stable gain printed log-periodic dipole antenna (PLPDA) with two slotted dielectric substrates, based on the substrate integrated waveguide (SIW) technologies is proposed. This antenna consists of a traditional PLPDA fed by SIW, which reduces dielectric loss and conductor loss and two pieces of Rodgers5880 substrates with periodic slots, two pieces of Rodgers5880 substrates...
An x-band tunable bandpass frequency selective surface (FSS) is presented in this article. The designed FSS is composed of three stacked metallic layers. They combine each other with metallic via, which provides the bias for the varactor at the same time. This configuration can decrease undesirable response associated with the added bias grid. The simulation is provided to illustrate its feasible...
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