Scattering by a Two-Dimensional Periodic Array of Vertically Placed Microstrip Lines

Article · August 2011with12 Reads
DOI: 10.1109/TAP.2011.2152332 · Source: IEEE Xplore
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.
    • The value of W is chosen to satisfy W ≪ λ hf where λ hf is the free-space wavelength at the highest operating frequency. A reasonably small value should be chosen to keep the group velocity of the modes independent of the direction of propaga- tion [17]. The ratio h / p is initially set to be 0.65 to maintain a minimal rejection level of 10 dB, where p is the periodicity and h is the thickness of the substrate.
    [Show abstract] [Hide abstract] ABSTRACT: We present a novel design procedure to implement wide bandstop frequency-selective structures using periodic arrays of vertically stacked parallel strip lines. The proposed structures employing parallel strip lines can simplify their design through equivalent circuit models. Three structures are designed based on simple equations to demonstrate the proposed procedure. The first structure features an independent design of the air and substrate regions allowing the use of higher-order resonances to extend the bandwidth. The second employs a cascaded array and the third represents a hybrid of both the first and second structures. Design examples have been provided for each proposed structure, achieving -10 dB fractional bandwidths of 78%, 100% and 137% for the first, second and third structures, respectively. The operating principles and design procedures are explained along with experimental verification for the first two structures.
    Article · Aug 2016
  • [Show abstract] [Hide abstract] ABSTRACT: A high-performance bandpass frequency selective structure (FSS) is presented, which consists of a 2-D periodic array of shielded microstrip lines. It exhibits stable elliptical filtering response under large variation of the angle of incidence. Its operating principle and design guidelines are discussed through equivalent circuit models. An efficient full-wave mode-matching method has been developed to analyze the proposed FSS. The proposed structure provides a simple and practically feasible solution to high-performance FSS since it can be fabricated using readily available microstrip line technology.
    Article · Oct 2012
  • [Show abstract] [Hide abstract] ABSTRACT: This letter describes a miniaturized bandstop frequency-selective structure (FSS) based on the stepped-impedance resonator (SIR). The FSS consists of a two-dimensional periodic array of vertical microstrip SIRs for thickness reduction. A shunt capacitor connecting the SIR center and ground is employed to widen the operating bandwidth and to improve the quasi-elliptic filtering response. It is shown that more than 40% thickness reduction of the FSS can be realized by choosing a small impedance ratio of the SIR, and a steep quasi-elliptic bandstop filtering performance is achieved by adjusting the value of the shunt capacitor. As an example, a prototype of the proposed FSS is designed, fabricated, and tested. The good agreement between simulated and measured results verifies the design concept of the miniaturized FSS.
    Article · Dec 2012
  • [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.
    Full-text · Conference Paper · Jan 2013 · IEEE Transactions on Antennas and Propagation
  • [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.
    Conference Paper · Jan 2013 · IEEE Transactions on Antennas and Propagation
  • [Show abstract] [Hide abstract] ABSTRACT: Based on a common-area concept and insertion of an infinitesimal perfect magnetic conductor (PMC) wire, a new mode-matching method for mixed coordinate systems is proposed for the analysis of periodic magnetodielectric, perfect electric conductor, and PMC circular cylinder arrays. Our scattering solutions were computed and they showed favorable agreements with other known results in terms of power scattering coefficients, resonant frequency of nanostructures, and the sum rule of extinction width. The low-frequency solutions of periodic arrays were also formulated and compared with the full-wave counterparts.
    Article · Mar 2013
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Conference Paper
August 2010
    Recently, a two-dimensional periodic array of vertically placed microstrip lines has been proposed for a number of useful applications. We analyze this array using an efficient full-wave mode-matching method. Our analysis comprises two parts. First, the propagation characteristics of the two-dimensional array are investigated by solving a unit-cell of this structure, which is subjected to a... [Show full abstract]
    Conference Paper
    August 2010
      In this paper, we describe a high performance bandpass FSS that can be realized using a two-dimensional periodic array of shielded microstrip lines. Based on the dispersion diagram of a shielded microstrip line, it is possible to excite a desired number of propagating modes and then control their coupling with air to obtain a required bandpass response. As an example, we design an FSS that... [Show full abstract]
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      May 2010 · IEEE Transactions on Antennas and Propagation · Impact Factor: 2.18
        A novel frequency selective surface (FSS) exhibiting pseudo-elliptic band-reject response is presented. The proposed FSS consists of a two-dimensional periodic array of microstrip lines. For an incident wave of linear polarization perpendicular to the printed lines, virtual magnetic walls are formed between the microstrip lines. Since a microstrip line shielded with magnetic side walls... [Show full abstract]
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        July 2010
          A large number of different frequency selective surface (FSS) designs have been proposed over the past four decades. Most of these designs are actually derived from the well-known traditional configuration that consists of a cascaded combination of two-dimensional (2-D) FSS and dielectric layers. Recently, an interesting concept of three-dimensional (3-D) FSS has been demonstrated to obtain... [Show full abstract]
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          October 2012 · IEEE Transactions on Antennas and Propagation · Impact Factor: 2.18
            A high-performance bandpass frequency selective structure (FSS) is presented, which consists of a 2-D periodic array of shielded microstrip lines. It exhibits stable elliptical filtering response under large variation of the angle of incidence. Its operating principle and design guidelines are discussed through equivalent circuit models. An efficient full-wave mode-matching method has been... [Show full abstract]
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