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Understanding radio channel path characteristics is a very important factor for ensuring quality of service and high data rates for indoor wireless communication systems. Obstacles such as human occupants, doors, walls, windows, etc. all have a significant impact on received signals strengths and will contribute to fading, multipath and shadowing effects. This paper studies the effects of changes...
In this paper, a novel reconfigurable multiband high impedance surface (HIS) is introduced which is based on employing simple patch-like elements with “off the shelf” varactor diodes and PIN switching diodes in a multilayer unit cell configuration to achieve reconfigurable zero-reflection phase bands at L, C, X and Ku radar bands. The proposed HIS structure consists of three individual layers of FR4...
An artificial magnetic conductor (AMC)-based multiband low-profile antenna for vehicle applications is designed, simulated and measured in this study. The AMC is a simple dual band structure, constructed on a 3.2 mm-thick FR-4 (εr=4.4) board, with the reflection phase and surface wave bandgaps in the 2.0 and 5.8 GHz ranges. A wideband printed circular disc monopole antenna uses this dual-band AMC...
A conformal patch antenna operating in the TM01 mode is integrated over an electromagnetic bandgap surface (EBG) to provide a beam scanning antenna. The circular EBG elements are arranged in a sector pattern and the vias on each sector of the EBG are switched in and out to steer the beam into that sector. The reflection coefficients for the antenna when the vias are switched remain stable and experimental...
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