Scattering by a Two-Dimensional Periodic Array of Vertically Placed Microstrip Lines
ABSTRACT Scattering by a two-dimensional (2-D) array of vertically placed microstrip lines is important for a number of recently proposed interesting applications. We investigate this scattering problem using an efficient full-wave mode-matching method. Our analysis comprises two parts. First, the propagation characteristics of the 2-D array are studied by solving a unit-cell of this structure, which is a microstrip line sandwiched between two periodic boundaries. In the second part, an air-to-array discontinuity is solved using Floquet modes in the air-region. Based on our full-wave analysis, we then present two frequency selective surfaces using this array, which exhibit stable quasi-elliptic filtering response under a large variation of the angle of incidence. Results of our full-wave analysis are in excellent agreement with those obtained from measurements and CST Microwave Studio.
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ABSTRACT: This paper presents a method for controlling scattering from a surface with the use of periodic elements on a metallic ground plate. A comb reflection frequency selective surface (CR-FSS) is compared with a novel pin reflection frequency-selective surface (PR-FSS). The performance of the periodic surfaces are based on their ability to reduce specular scatter and redirect this as backscatter compared with a flat perfectly conducting (PEC) plate. The PR-FSS has comparable scattering performance when compared with the CR-FSS, despite a 90% reduction in fin material. Simulation and experimental results show that the PR-FSS is effective only for TM polarization, whereas the CR-FSS is adequate for both TM and TE polarizations. The effect of changes to the angle of incidence, height, and separation of the pins and fins are investigated. Aluminium prototypes have been manufactured and tested to provide experimental validation of the designs and are compared with simulated results. This includes full radar scattering cross sections, angle-of-incidence performance, and operational frequency bandwidth. Furthermore, suitable engineering applications of the CR-FSS and PR-FSS structures are considered.IEEE Transactions on Antennas and Propagation 01/2014; 62(9):4518-4527. · 2.46 Impact Factor
Conference Paper: Antenna research and development in Singapore[Show abstract] [Hide abstract]
ABSTRACT: This paper briefly overviews the research and development (R&D) of antennas and computational electromagnetics in public research institutions in Singapore. The R&D activities of local universities and research institutes in particular, from Agency of Science, Technology and Research (A*STAR) in these areas are briefed with the selected projects from 10 MHz to 10 THz.Antennas and Propagation (EuCAP), 2013 7th European Conference on; 01/2013
Conference Paper: Three-dimensional bandpass frequency selective structures[Show abstract] [Hide abstract]
ABSTRACT: Bandpass frequency-selective surfaces are very useful in many microwave applications. A traditional bandpass frequency-selective surface, consisting of a two-dimensional (2-D) periodical array of slots/apertures, is difficult to realize high selectivity, wide out-of-band rejection, and stable response under different angles of incidence. In this paper, a new class of three-dimensional (3-D) bandpass frequency selective structures (FSSs) based on an array of shielded microstrip lines are described, which can provide a number of transmission zeros/poles at desired frequencies and then exhibit high performance. A generalized equivalent circuit is also introduced to explain the operating principle of these high-performance bandpass FSSs.Electromagnetic Theory (EMTS), Proceedings of 2013 URSI International Symposium on; 01/2013