Incident angle-dependent effective surface impedance (Z/sub S/) of Electromagnetic Crystal (EMXT)

• Published in: IEEE microwave and wireless components letters Vol. 14; no. 9; pp. 437 - 439
• Main Authors: Hao Xin, Kim, M., Hacker, J.B., Higgins, J.A.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-09-2004; Institute of Electrical and Electronics Engineers
• Subjects: Analytical models; Antennas; Apertures; Applied sciences; Computer simulation; Crystals; Electromagnetic measurements; Electromagnetic modeling; Electromagnetic reflection; Electromagnetic waveguides; Exact sciences and technology; Impedance; Impedance measurement; Mathematical analysis; Mathematical models; Microwaves; Phased arrays; Radiocommunications; Reflection; Size measurement; Surface impedance; Telecommunications; Telecommunications and information theory; Waveguides; Surface impedance; Open waveguide; Oblique incidence; Phased array; Numerical method; Phased array antenna; Boundary condition; Electromagnetic crystal (EMXT) surfaces; Waveguide; Finite element method; infinite phased array; Angular measurement; Photonic crystal; Analytical method; Numerical simulation; Simulator; Rectangular waveguide
• ISSN: 1531-1309; 1558-1764
• DOI: 10.1109/LMWC.2004.832077

Electromagnetic crystal (EMXT) surfaces are modeled with effective surface impedance method. Effects of oblique incidence are studied using a technique similar to the waveguide simulator method for analyzing infinite phased array. Numerical results are compared with an analytical model. EMXT samples are characterized by open-ended waveguide reflection measurements using different aperture sizes (WR28 and WR22). The measurements confirm the angular dependence of the EMXT surface impedance. A rectangular waveguide with EMXT sidewalls is modeled by using the angle-dependent effective surface impedance as the sidewall boundary condition. Excellent agreement between this model and full-wave finite-element simulation of the entire waveguide structure is obtained.