Search

A dual-band substrate integrated waveguide (SIW) filter is presented in this article. The dual-band cross-coupled design procedure is based on the frequency transformation from the normalized frequency domain to the actual frequency domain, which can calculate the coupling coefficients and the external quality factors analytically. The cross-coupled SIW filter has the flexibility to achieve different kinds of filtering characteristics with the same coupling structure. To validate the method, a practical SIW dual-band filter operating at 5.85-5.95 GHz and 6.05-6.15 GHz is designed and fabricated. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1609-1612, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26908 [ABSTRACT FROM AUTHOR]

In this article, numerical result obtained using two different commercially available electromagnetic (EM) codes based on an integral equation method are presented. One of the methods solves the integral equation by the method of moments (MoM) using higher order basis functions (the commercially available parallel software named TIDES), and the other one solves the integral equation by MoM with a multilevel fast multipole algorithm (MLFMA) incorporating the RWG basis functions (the commercially available software FEKO). Numerical results indicate that the integral equation solver with higher order basis functions occupies less than 40% of the RAM and the execution time is significantly less when compared with that of using the RWG basis functions along with MLFMA. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1219–1225, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24271 [ABSTRACT FROM AUTHOR]

A 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 [ABSTRACT FROM AUTHOR]

A compact dual-band microstrip filter with equal-length split-ring resonators and 0°-feed structure is proposed in this article. The frequency splitting effect of the equal-length SRRs is described in detail. A 0°-feed structure is introduced and applied to realize additional transmission zeros at finite frequencies. The measurement of the filter is in good agreement with the simulation. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1098–1101, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23288 [ABSTRACT FROM AUTHOR]

This paper presents a simplified hybrid calculation method, which enables calculation of a field very close to the surface of a perfect conducting object as well as the surface field itself. This method is based on the series electric dipole modeling (SEDM) technique, used to quickly and efficiently calculate near fields of wire antennas or objects, and the Kemptner method, used to find the surface fields of patches. The present method combines advantages of both the SEDM and Kemptner method techniques, without their weak points. Several examples in this paper show the validity of the SEDM and the simplified hybrid calculation method. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 36: 471–474, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10793 [ABSTRACT FROM AUTHOR]

The general form of the electromagnetic problem in general media (including lossy and nonreciprocal media) and with the general boundary conditions (including the reactance boundary) is given, the Green formula and its expressions in electromagnetism are introduced, and the generalized functional is presented. It is shown that the available functionals in the literature are special results of the generalized functional, and new applications are also given on the basis of the generalized functional. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 17: 255–259, 1998. [ABSTRACT FROM AUTHOR]

A compact dual-band bandpass filter using folded tri-section stepped impedance resonators (FTSIRs) is proposed in this article. Resonance characteristics of the tri-section stepped impedance resonator (TSIR) are derived and described in detail. A cross-coupled dual-band filter for WLAN(2.4/5.2 GHz) is designed with four FTSIRs. The measurement of the filter is in good agreement with the simulation. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 407–409, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23110 [ABSTRACT FROM AUTHOR]

A novel type of dual-band microstrip structure and its equivalent circuit are investigated, which is composed of defected split-ring resonator and interdigital capacitor. The influence of design parameters on the frequency characteristics is discussed, then a dual-band microstrip filter, which has two passbands of 1.8–2.5 GHz and 5.5–5.9 GHz with a transmission zero, is designed and fabricated. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2104–2106, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22673 [ABSTRACT FROM AUTHOR]

A novel matrix perturbation theory to the eigenequation [A][u] = λ[u] is investigated, in which the perturbation solutions to eigen-value λ and eigenvector [u] are given. One of the applications of the above theory--application in a microwave resonate cavity--is researched. [ABSTRACT FROM AUTHOR]

The conditions for perfect absorption under oblique incidence in a single-layer homogeneous absorber backed by a perfectly conducting plate are derived in this article. The cases corresponding to the two types of polarization of the incidence-wave, perpendicular polarization (TE) and parallel polarization (TM), are discussed, respectively. Some conclusions and curves are given. [ABSTRACT FROM AUTHOR]

For a half-space barrier potential, it has been shown that the potential functions in a shallow region 0 < x < d can be accurately reconstructed by using a generalized Born approximation from the reflection coefficient r(k) at x = 0, and the reconstructed error is notable when x > d. By using the network theory presented in this article, we can transform the reflection coefficient at x = 0 into the one at x = d, from which the potential functions of the region x > d can be accurately reconstructed. Numerical examples are given, which show the applicability of this method. [ABSTRACT FROM AUTHOR]

This article derives a Lindell formulation based on a generalized variational principle. A complex dielectric constant measurement of a small-loss dielectric rod using the Rayleigh--Ritz method gives accurate variational analysis. The concept of complex frequency ω is introduced in general, and the stability of the solution is discussed. When compared with the results of perturbation, it is concluded that the deviation of the algorithm is worthy of more attention. [ABSTRACT FROM AUTHOR]