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A spectral-element time-domain (SETD) method based on Gauss–Lobatto–Legendre (GLL) polynomials is presented to solve Maxwell's equations. The proposed SETD method combines the advantages of spectral accuracy with the geometric flexibility of unstructured grids. In addition, a 4th-order Runge–Kutta method for time integration provides high-order accuracy and thus reduces the temporal discretization errors. The numerical results demonstrate its spectral accuracy with the order of basis function and show the high efficiency of the proposed method due to its exponential convergence. © 2006 Wiley Periodicals, Inc. Microwave Opt Technical Lett 48: 673–680, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21440 [ABSTRACT FROM AUTHOR]

For microwave signals within the 0.5 to 10.5 GHz range, we present an integrated broadband balun that carries signals from coaxial cable to microstrip to parallel-plate line. We use this arrangement as the feed line for a broadband double-sided antenna, and this antenna feed is presented as an application of the integrated balun. In addition, we devise a testing method for the balun, which is demonstrated. Through this testing method, the transmission, reflection, and radiation losses associated with the balun are readily determined. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 501–504, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20679 [ABSTRACT FROM AUTHOR]