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- Brian J. Rautio, Vladimir I. Okhmatovski, Andreas C. Cangellaris, James C. Rautio, Jay Kyoon Lee
- IEEE Transactions on Microwave Theory andâ€¦
- 2014

The unified fast Fourier transform (UFFT) methodology is proposed for fast method of moments analysis of dense integrated circuits embedded in layered media inside perfectly electric conducting or perfectly magnetic conducting enclosures of rectangular cross section. The pre-corrected fast Fourier transform (FFT) method is modified to handle the dyadicâ€¦ (More)

- Kepei Sun, Jay Kyoon Lee, Jennifer W. Graham
- 2014 IEEE Antennas and Propagation Societyâ€¦
- 2014

A rectangular waveguide filled with uniaxial medium is treated. Different orientations of the optic axis are considered. Results of wave decompositions with respect to the optic axis are presented and compared with conventional transverse-to-z solutions. Computations show that the effect of anisotropy not only changes the field distributions, but also leadsâ€¦ (More)

- Kepei Sun, Jun Hyeak Choi, Jay Kyoon Lee
- 2016 IEEE MTT-S International Microwave Symposiumâ€¦
- 2016

A novel negative-resistance composite right/left-handed (NR-CRLH) leaky-wave antenna (LWA) is presented. The conventional CRLH unit cell is made configurable by using the negative resistance (NR) circuit. An LWA constituted by the proposed unit cells allows manipulation of the current distributions over the radiating surface of the antenna. Consequently,â€¦ (More)

- Kepei Sun, Jay Kyoon Lee, Jennifer W. Graham
- IEEE Transactions on Microwave Theory andâ€¦
- 2016

A rectangular waveguide filled with a uniaxial medium is treated. Different orientations of the optic axis are considered, and the transmission characteristics of the guided waves are studied. When the optic axis is parallel to one of the <inline-formula> <tex-math notation="LaTeX">$x$ </tex-math></inline-formula>-, <inline-formula> <tex-mathâ€¦ (More)

- Jennifer W. Graham, Jay Kyoon Lee
- Proceedings of the 2012 IEEE Internationalâ€¦
- 2012

Microstrip dipole antennas are modeled using arbitrarily oriented biaxially anisotropic substrates. The Method of Moments is used to compute induced currents and the results are used to calculate input impedance, resonant length and directive gain. We show that the orientation of the medium does affect performance metrics but at varying degrees based on theâ€¦ (More)

- Jennifer W. Graham, Jay Kyoon Lee
- 2013 IEEE Antennas and Propagation Societyâ€¦
- 2013

Rectangular patch antennas are modeled using arbitrarily oriented biaxially anisotropic substrates. The Method of Moments is used to compute induced currents and the results are used to calculate input impedance, resonant length, impedance bandwidth and radiation patterns. We show that the biaxial anisotropy and orientation of the medium affect performanceâ€¦ (More)

- Kepei Sun, Jay Kyoon Lee, Jennifer W. Graham
- 2015 IEEE International Symposium on Antennas andâ€¦
- 2015

Solutions of a metallic rectangular waveguide filled with uniaxial medium are obtained with a new approach. The direction of the optic axis is tilted but lying in one of the sidewall planes of the waveguide. The formulation is based on decomposition into ordinary and extraordinary waves. The proposed method seeks wavenumbers of supported travelling modes,â€¦ (More)

- Ahmet Fazil Yagli, Konya Yolu, Jay Kyoon Lee, Ercument Arvas
- 2009

A three-dimensional scattering field Transmission Line Modeling (TLM) algorithm is established to obtain bistatic radar cross sections of frequency dispersive gyromagnetic objects. Starting from the 1D TLM modeling of gyrotropic materials, a scattering field TLM algorithm is derived for 3D calculations. For verification, the bistatic radar cross sectionâ€¦ (More)

This paper presents a method of moments (MoM) solution for the problems of electromagnetic scattering by inhomogeneous threedimensional bianisotropic scatterers of any shape. The electromagnetic response of bianisotropy has been described by the constitutive relations of the most general form composed of four 3 Ã— 3 matrices or tensors. The volumeâ€¦ (More)

- Mohsen Yazdani, Jay Kyoon Lee, Joseph R. Mautz, Ercument Arvas, Kepei Sun
- IEEE Transactions on Antennas and Propagation
- 2015

Ray tracing theory for a radially uniaxial dielectric sphere is presented in this communication. Reflection and transmission of the plane waves obliquely incident on the spherical interface between air and uniaxial are briefly examined and the general formulations for phase velocities as well as the refractive indices of the ordinary and extraordinary wavesâ€¦ (More)