Kinds Of Unit Research Articles

A Polarization Conversion Coding Metasurface for Broadband Radar Cross-Section Reduction

We have designed a polarization conversion coding metasurface (CM) for broadband radar cross-section reduction. The CM is made up of a kind of deformed bowtie-shaped particle and its mirror, named “0” and “1”, respectively, which can realize cross-polarization conversion under the vertical incidence of a linearly polarized wave. According to the coding sequence optimized by the genetic algorithm, the two kinds of unit are arranged to form a design, called a 1-bit CM, which can scatter electromagnetic waves in various directions. The simulation results demonstrate that the two kinds of unit can achieve more than a 90% polarization conversion ratio, and the whole CM can realize more than a 10-dB reduction of monostatic radar cross-section (RCS) from 8.8 GHz to 20.9 GHz, while the maximum RCS reduction of 32.5 dB can be obtained at 14 GHz under the normal incidence of x- and y-polarized waves. The experimental results are almost identical to the simulation. Thus, we believe that the designed 1-bit CM can be well applied for the stealth business.

A novel broadband EBG using cascaded mushroom‐like structure

AbstractA novel broadband electromagnetic band‐gap (EBG) structure is presented using cascaded mushroom‐like structure with different radius of via. Direct transmission method is used to determine the band‐gap of the EBG structure. The effects of the radius of via and unit number on the mushroom‐like EBG structure are investigated. Two kinds of unit with different via radius are cascaded to enlarge the band‐gap of EBG structure, which achieves almost 70%. The simulation and experimental results show that the band‐gap covers the stop‐band produced by the two uniform configurations with different radius, respectively. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2167–2170, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23598