Kavita Goverdhanam

Coplanar stripline components for high-frequency applications

In this paper, coplanar stripline (CPS) discontinuities such as a narrow transverse slit, a symmetric step, a right-angle bend, and a T-junction are characterized and their performance is parameterized with respect to frequency and geometry. In addition, filter design using coplanar stripline discontinuities has been investigated. Lumped equivalent circuits are presented for some of the discontinuities. The element values are obtained from the measured discontinuity scattering parameters. The experimental results are compared with theoretical data obtained using the finite-difference time-domain (FDTD) technique for validation and show very good agreement.

Coplanar stripline propagation characteristics and bandpass filter

In this paper, a coplanar stripline bandpass filter is developed. The propagation characteristics of the coplanar stripline used for the construction of the filter are presented in the form of phase constant and attenuation constant. The filter is characterized experimentally as well as theoretically by use of the finite-difference time-domain (FDTD) technique. The agreement between the measured and modeled filter characteristics is very good.

Coplanar stripline components for high frequency applications

In this paper, coplanar stripline discontinuities such as a slit, a right angle bend and a T-junction are characterized and their performance is parameterized with respect to frequency and geometry. Lumped equivalent circuits are presented for some of them. The element values are obtained from the measured discontinuity scattering (S) parameters. The experimental results are compared with theoretical data obtained using the Finite Difference Time Domain (FD-TD) technique for validation and show very good agreement.

Applications of multiresolution based FDTD multigrid

A Multigrid 2-D Finite Difference Time Domain (FDTD) technique based on Multiresolution analysis with Haar wavelets is used to analyze structures such as an empty waveguide and a shielded stripline. The results obtained are compared with those computed using a finer resolution regular FDTD mesh. This comparative study illustrates the benefits of using wavelets in FDTD analysis.

Micro-coplanar striplines-new transmission media for microwave applications

In this paper a new transmission line for microwave applications, referred to here as the Micro-Coplanar Stripline (MCPS), is introduced. The propagation characteristics, such as, characteristic impedance (Z/sub 0/) and effective dielectric constant (/spl epsiv//sub eff/) for a range of MCPS geometries have been modeled using the Finite Difference Time Domain (FDTD) technique and presented here. Also, preliminary experimental results on the performance of an MCPS-Microstrip transition and an MCPS-fed patch antenna are presented. The results indicate several potential applications of the MCPS line in microwave integrated circuit technology.

Novel three-dimensional vertical interconnect technology for microwave and RF applications

In this paper, novel 3D interconnects suitable for applications in microwave and RF integrated circuit technology have been presented. The interconnect fabrication process and design details are presented. In addition, measured and numerically modeled results of the performance of the interconnects have been shown. The results indicate that the proposed technology has tremendous potential applications in integrated circuit technology.

Applications of Haar wavelet based MRTD scheme in the characterization of 3D microwave circuits

In this paper, a 3D MRTD scheme which uses Haar wavelet basis has been presented. For the first time in literature, the Haar wavelet based 3D MRTD scheme of arbitrary resolution has been derived for application in the characterization of complex 3D Microwave circuits.

Applications of nano-satellites and cube-satellites in microwave and RF domain

This paper presents an overview of microwave technologies for Small Satellites including NanoSats and CubeSats. In addition, examples of space communication technology demonstration projects using CubeSats are presented. Furthermore, examples of miniature instruments for Earth science measurements are discussed.

A Perfectly Matched Layer Absorber Formulation for Haar Wavelet Based MRTD

A PML absorber formulation for Multiresolution Time Domain (MRTD) schemes with Haar wavelets of arbitrary order of resolution is provided in this paper. Validation studies prove the efficiency of the absorber which yields sufficiently low reflections even under coarse sampling conditions, demonstrating a better performance compared to conventional FDTD PML absorbers.

RF interference mitigation techniques to enable radio communications

RF Interference Mitigation is key to enabling reliable and uninterrupted Communications in congested spectrum environments. This paper provides an overview of various types of interference mitigation techniques particularly as encountered by military and government radio systems. The opportunities and challenges associated with developing these technologies will also be discussed.