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This paper presents a simple, compact, and reconfigurable patch element geometry for multiband FSS applications. The patch element reconfigurability enables the development of reconfigurable FSS structures. The proposed FSS reconfigurability is theoretically and experimentally investigated through the use of small thin conducting strips on the FSS patch element geometry. Simulation is performed using...
This paper presents a compact dual-band dual polarized frequency selective surface (FSS) with angular stability for wireless communication applications. The proposed FSS element geometry is composed of a slotted cross dipole combined with four annular rings which are placed to provide symmetry along the conducting patch main axes. Simulation is performed using Ansoft HFSS software to ensure dual band...
This paper presents the analysis of microstrip monopoles for applications in ultra wideband systems (UWB). Antenna structures using circular and semi annular ring patches are considered. The antennas are printed on a FR4 dielectric substrate and present truncated ground planes with a small cut beneath the microstrip line feeder to improve the antenna impedance matching. Results for return loss, resonant...
This paper proposes a reconfigurable frequency selective surface (FSS) operating in the X band composed of triangular elements periodically placed on a single FR-4 dielectric layer. The reconfiguration of the proposed FSS allows a quasi-linear variation of the rejecting resonant frequency as function of the incident wave angle. The variation of the incident wave angle is provided by rotation of the...
An analysis of a fractal-like circular patch element for miniaturized frequency selective surfaces (FSSs) is presented. The analysis is performed using the Wave Concept Iterative Procedure (WCIP), a full-wave method. The proposed FSS geometry has a stable frequency response in relation to the oblique incidence of plane waves. In addition, the FSS patch element presents a fractal-like behavior, being...
A Wave Concept Iterative Procedure (WCIP) based on transverse waves formulation is presented. This method is applied to analyze annular microstrip patch antennas on anisotropic substrates. The use of FFT algorithm to define a fast modal Fourier transform results in accurate solutions with significant savings in computation time and memory requirements. WCIP results are compared with the HFSS simulation...
De-poled PZTs (Lead-Zirconium-Titanate) were studied in the terms of nonlinearity properties, dielectric losses and breakdown. As shown in this paper de-poled PZTs have lower permittivity and dielectric losses compared to poled ones and BT (Barium Titanate) ceramic dielectrics. This was confirmed by measuring the permittivity, polarization curve and, tangent loss (δ) of this material. As discussed...
Low loss dielectric materials with high permittivity and nonlinear behavior are essential for use in capacitive nonlinear transmission lines (NLTLs) for RF generation. NLTLs have a great potential to generate soliton waves for high-power microwave applications in mobile defense platforms and satellite communications. In this paper, the dielectric properties of a piezoelectric capacitor based on lead-zirconate-titanate...
This work presents an investigation on the parameters of microstrip patch antennas with metamaterial inspired substrates and superstrates. The metamaterial inspired behavior is obtained using split-ring resonators printed on dielectric substrates and complementary split-ring resonators perforated in thin metallic surfaces (such as ground planes). The effect of these metamaterial structures on the...
The simultaneous switching noise (SSN) from single-ended signaling I/O interfaces is significant when there are multiple channels transmitting data in parallel. The memory interfaces use the single-ended signaling scheme where the power delivery noise spectrum may coincide with some critical radio bands or resonance frequencies within the platform depending on the bit pattern being transmitted from...
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