Sat, 26 Jul 2008 06:05:33 BST CiteULike: dcastro's line http://www.citeulike.org/user/dcastro/tag/line CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2782047 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 53, No. 4. (2005), pp. 1515-1521.</i><br /><br />The novel one-dimensional left-handed microstrip lines (LHMLs) consisting of the arrays of thin wires and two-layer split-ring resonators are investigated theoretically and experimentally in this paper. Unlike the conventional left-handed metamaterials for waveguides or microstrip lines, which are bulky three-dimensional constructions or require the lumped elements for high-pass configuration, this distributed structure can be directly implemented on a substrate by photolithographic techniques without soldering any chip inductors or capacitors. Moreover, it can also be easily realized at a higher frequency region by scaling the dimensions of the structure, making it highly efficient and flexible in millimeter-wave applications. To characterize the inhomogeneous LHML, the effective medium description is developed for extracting the effective electromagnetic parameters, i.e., the complex effective permittivity and permeability, as well as the refractive index. Results show that not only the simultaneously negative real permittivity and permeability, but also the antiparallel phase and group velocities may be achieved in the design passband region. In contrast to the antenna array using the conventional microstrip delay line, the LHML is incorporated in the series-fed microstrip combline array to exhibit the leading phase between the successive elements. Effective electromagnetic parameters of novel distributed left-handed microstrip lines Shau-Gang Mao Shiou-Li Chen Chen-Wei Huang doi:10.1109/TMTT.2005.845192 Microwave Theory and Techniques, IEEE Transactions on, Vol. 53, No. 4. (2005), pp. 1515-1521. 2008-05-09T23:56:00-00:00 2005 Microwave Theory and Techniques, IEEE Transactions on 53 4 1515 1521 lh line microstrip http://www.citeulike.org/user/dcastro/article/2774521 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 5. (1999), pp. 629-635.</i><br /><br />This paper presents the theory of a microstrip line on artificial periodic substrates. A two-stage moment method in conjunction with an array-scanning scheme is proposed for the microstrip characterization. The analytic and numerical methods dealing with the interaction of microstrip components (continuous plane-wave spectrum) with artificial periodic materials (discrete plane-wave spectrum, Floquet modes) are discussed. The method of solution involves two stages of vector integral equations and moment methods. The first integral-equation formulation is to find the Green's function for a planar periodic structure. A spectral-domain moment method is applied to the second vector integral equation to determine the fields or currents on the circuit components and the associated parameters of interest. Guided-wave characteristics of a microstrip line on artificial periodic substrates, including the propagation constant and the characteristic impedance, are investigated. Propagation bandgap of a microstrip line due to periodic elements is characterized. Experiment on a three-layer microstrip-line structure with a periodic mid-layer is conducted to validate the theory Theory of microstrip lines on artificial periodic substrates Hung-Yu Yang doi:10.1109/22.763165 Microwave Theory and Techniques, IEEE Transactions on, Vol. 47, No. 5. (1999), pp. 629-635. 2008-05-09T06:44:35-00:00 1999 Microwave Theory and Techniques, IEEE Transactions on 47 5 629 635 line microstrip tl http://www.citeulike.org/user/dcastro/article/2762250 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 36, No. 3. (1988), pp. 505-513.</i><br /><br />An analytical method based on the aperture coupling theory and the derivation of the <e1>S</e1>-parameter matrix has been developed for modeling a microstrip line coupled to a microstrip patch antenna using a circular coupling aperture. Closed-form solutions were derived for scattering parameters of the coupling circuit. Input impedance and matching condition can be calculated from the equivalent six-port network. The theoretical results agree well with the measurements. The analysis should have many applications in active array and spatial power combining systems Network modeling of an aperture coupling between microstrip line and patch antenna for active array applications X Gao K Chang doi:10.1109/22.3542 Microwave Theory and Techniques, IEEE Transactions on, Vol. 36, No. 3. (1988), pp. 505-513. 2008-05-06T18:35:45-00:00 1988 Microwave Theory and Techniques, IEEE Transactions on 36 3 505 513 active antenna array coupling line microstrip patch http://www.citeulike.org/user/dcastro/article/2678823 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 32, No. 4. (1984), pp. 427-432.</i><br /><br />The scattering parameters of four-ports consisting of coupled lines with coupled or uncoupled connecting branches are derived in terms of the even- and odd-mode impedances and the lengths of the lines. These are used to analyze and formulate basic design procedures for the application of these structures as directional couplers including 0° and 90° 3-dB hybrids. The proposed new structures are quite compact at lower frequencies as compared to conventional uncoupled branch-line and rat-race hybrids. The results for the case of the coupled-line four-port with uncoupled branch lines also lead to closed-form expressions for the lengths and impedances of the lines required to nullify the effect of coupling between the main lines of a conventional branch-line coupler for use at higher frequencies. The measured response of the fabricated couplers is in good agreement with the theoretical predictions. Analysis and Design of Branch-Line Hybrids with Coupled Lines VK Tripathi HB Lunden JP Starski Microwave Theory and Techniques, IEEE Transactions on, Vol. 32, No. 4. (1984), pp. 427-432. 2008-04-16T19:41:10-00:00 1984 Microwave Theory and Techniques, IEEE Transactions on 32 4 427 432 branch-line coupler line http://www.citeulike.org/user/dcastro/article/2674710 <i>Communications Magazine, IEEE, Vol. 41, No. 4. (2003), pp. 34-40.</i><br /><br />This article constitutes an overview of the research, application, and regulatory activities on power line communications. Transmission issues on the power line are investigated and modeling approaches illustrated. Contemporary communication techniques and reliability issues are treated. A description of regulatory activities worldwide is given. Finally, market perspectives and promising applications are covered to assess the viability of this communications environment. Power line communications: state of the art and future trends N Pavlidou Han J Yazdani B Honary doi:10.1109/MCOM.2003.1193972 Communications Magazine, IEEE, Vol. 41, No. 4. (2003), pp. 34-40. 2008-04-15T18:08:36-00:00 2003 Communications Magazine, IEEE 41 4 34 40 communication line plc power