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Design and measurement of a planar radome absorber under oblique incidence are presented. The structure is composed of a bandpass multilayers frequency selective surface (FSS) combined with periodic cylindrical-shaped absorbers. This configuration made the resulting structure transparent at the intended antenna operational frequencies (C-band) and absorptive at higher frequencies (X-band). The prototype...
This paper analyses the effect of noisy near-field amplitude data on the phase retrieval algorithm. Additive white Gaussian noise is applied on the signal. Signal-to-noise ratios between 3 dB and 60 dB are considered. It'll be shown that using the Iterative Fourier Transform the far-field data can be obtained even under low signal-to-noise ratio.
Design and characterization of a multilayer structure consisting of stacked frequency selective surfaces (FSS) combined with a patterned laminate absorber is presented. The FSS part is a higher order bandpass filter that operates in the C-band, namely from 5 GHz to 6 GHz. Its higher order response is achieved through the stacking of capacitive-inductive-capacitive layers to maintain the low-profile...
Design of frequency selective radome having enhanced transmissive and absorptive characteristics is presented. The planar radome consists of laminate absorber and frequency selective structures (FSS). Lower insertion loss is achieved by patterning the laminate absorber while wider passband and steeper slope are obtained by using two layers of FSSs. Based on this approach the structure has the following...
Feed based scanning Antenna Pattern Comparison (APC) is a method to improve antenna measurement accuracy similar to the well-known APC method. In contrast to APC, the transmit antenna (feed) is moved instead of the AUT. This is beneficial because moving the feed is in general easier than moving the AUT. Previous publications have shown that horizontal feed based scanning APC and APC show similar improvements...
This paper proposes a method to evaluate the performance of microwave absorbers in free space environment based on the bi-static scattering cross section and the absorption efficiency. Evaluation based only on reflection at boresight is not sufficient since information concerning wave scattering on the sphere surrounding the absorber is unknown. To illustrate the method, we design an ultra-thin absorber...
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