@article{yakovlev_khalil_hicks_mortazawi_steer_2000, title={The generalized scattering matrix of closely spaced strip and slot layers in waveguide}, volume={48}, ISSN={["1557-9670"]}, DOI={10.1109/22.817481}, abstractNote={In this paper, a method-of-moments integral-equation formulation of a generalized scattering matrix (GSM) is presented for the full-wave analysis of interactive planar electric and magnetic discontinuities in waveguide. This was developed to efficiently handle a variety of waveguide-based strip-to-slot transitions, especially on thin substrates. This single matrix formulation replaces the problematic procedure of cascading individual GSM's of an electric (strip) layer, a thin substrate, and a magnetic (slot) layer.}, number={1}, journal={IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES}, author={Yakovlev, AB and Khalil, AI and Hicks, CW and Mortazawi, A and Steer, MB}, year={2000}, month={Jan}, pages={126–137} }
 @article{khalil_steer_1999, title={A generalized scattering matrix method using the method of moments for electromagnetic analysis of multilayered structures in waveguide}, volume={47}, ISSN={["0018-9480"]}, DOI={10.1109/22.798013}, abstractNote={The method of moments (MoM) in conjunction with the generalized scattering matrix (GSM) approach is proposed to analyze transverse multilayered structures in a metal waveguide. The formulation incorporates ports as an integral part of the GSM formulation, thus, the resulting model can be integrated with circuit analysis. The proposed technique permits the modeling of interactive discontinuities due to the consideration of a large number of modes in the cascade. The GSM-MoM method can be successfully applied to the investigation of a variety of shielded multilayered structures, iris coupled filters, determining the input impedance of probe excited waveguides, and of waveguide-based spatial power combiners.}, number={11}, journal={IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES}, author={Khalil, AI and Steer, MB}, year={1999}, month={Nov}, pages={2151–2157} }
 @article{khalil_yakovlev_steer_1999, title={Efficient method-of-moments formulation for the modeling of planar conductive layers in a shielded guided-wave structure}, volume={47}, ISSN={["0018-9480"]}, DOI={10.1109/22.788615}, abstractNote={An electric-field integral-equation formulation discretized via the method of moments (MoM) is proposed for the analysis of arbitrarily shaped planar conductive layers in a shielded guided-wave structure. The method results in a generalized scattering matrix (GSM) for the planar structure and can be used with other GSM's, derived using this or other techniques, to model cascaded structures in waveguide. The Kummer transformation is applied to accelerate slowly converging double series expansions of impedance matrix elements obtained in the MoM solution. In this transformation, the quasi-static part associated with a singularity of the electric-type Green's function in the region of a conductive layer is extracted and evaluated in terms of modified Bessel functions, resulting in a dramatic reduction of terms in a double series summation. The proposed technique permits the modeling of a variety of conductive frequency-selective surfaces, including quasi-optical grids and patch arrays for application to spatial power combining.}, number={9}, journal={IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES}, author={Khalil, AI and Yakovlev, AB and Steer, MB}, year={1999}, month={Sep}, pages={1730–1736} }
 @article{steer_harvey_mink_abdulla_christoffersen_gutierrez_heron_hicks_khalil_mughal_et al._1999, title={Global modeling of spatially distributed microwave and millimeter-wave systems}, volume={47}, ISSN={["1557-9670"]}, DOI={10.1109/22.769316}, abstractNote={Microwave and millimeter-wave systems have generally been developed from a circuit perspective with the effect of the electromagnetic (EM) environment modeled using lumped elements or N-port scattering parameters. The recent development of the local reference node concept coupled with steady-state and transient analyses using state variables allows the incorporation of unrestrained EM modeling of microwave structures in a circuit simulator. A strategy implementing global modeling of electrically large microwave systems using the circuit abstraction is presented. This is applied to the modeling of a quasi-optical power-combining amplifier.}, number={6}, journal={IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES}, author={Steer, MB and Harvey, JF and Mink, JW and Abdulla, MN and Christoffersen, CE and Gutierrez, HM and Heron, PL and Hicks, CW and Khalil, AI and Mughal, UA and et al.}, year={1999}, month={Jun}, pages={830–839} }