Deb Chatterjee

University of Missouri Kansas City, Department of Computer Science and Electrical Engineering, Faculty Member

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Papers by Deb Chatterjee

Analytical Evaluation of Sommerfeld Integral Tails Present in Two Layered Media Green's Functions

2018 IEEE Indian Conference on Antennas and Propogation (InCAP), 2018

In this paper, a fast and reliable method of evaluating Sommerfeld integral (SI) tails is present... more In this paper, a fast and reliable method of evaluating Sommerfeld integral (SI) tails is presented. The analytical evaluation method obviates using extrapolation methods and replaces the SI tail by an appropriate closed form expression. The result from analytical evaluation method has been compared against result from weighted averages method (WAM) and has displayed a good agreement. The proposed method also reduces the computational time by at least 45% when compared with WAM.

An Efficient Algorithm for Locating TE and TM Poles for a Class of Multiscale Inhomogeneous Media Problems

IEEE Journal on Multiscale and Multiphysics Computational Techniques, 2020

Asthma is one of the most prevalent and costly chronic conditions in the United States, which can... more Asthma is one of the most prevalent and costly chronic conditions in the United States, which cannot be cured. However, accurate and timely surveillance data could allow for timely and targeted interventions at the community or individual level. Current national asthma disease surveillance systems can have data availability lags of up to two weeks. Rapid progress has been made in gathering nontraditional, digital information to perform disease surveillance. We introduce a novel method of using multiple data sources for predicting the number of asthma-related emergency department (ED) visits in a specific area. Twitter data, Google search interests, and environmental sensor data were collected for this purpose. Our preliminary findings show that our model can predict the number of asthma ED visits based on near-real-time environmental and social media data with approximately 70% precision. The results can be helpful for public health surveillance, ED preparedness, and targeted patient interventions.

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Comparative Evaluation of Some Empirical Design Techniques for CAD Optimization of Wideband U-Slot Microstrip Antennas

Applied Computational Electromagnetics Society Journal, 2005

In this paper three different empirical techniques, for design of wideband U-slot microstrip patc... more In this paper three different empirical techniques, for design of wideband U-slot microstrip patch antennas on infinite, grounded substrates (r = 1.0, 4.0, and 6.15), has been studied extensively. Methods I and III, developed by the present authors, commonly utilize the property of dimensional invariance in designing the radiating patch of the U-Slot microstrip antenna. These two methods use empirical (quadratic) curve-fit equations, and formulas for design of probe-fed rectangular patches, respectively, to initiate the corresponding probe-fed U-Slot patch designs. The second (method II) approach, published earlier by different authors, principally utilizes the distinction between four resonant frequencies and calculates the various dimensions associated with the U-Slot patch radiator. The initial U-slot designs from the three empirical techniques have been further optimized for enhanced bandwidths via: (a) parametric simulation, and (b) built-in global optimizers such as Powell and Genetic algorithms in the commercially available microstrip CAD software, IE3D. Extensive analysis, based on: (a) comparison of the three empirical design algorithms (methods I, II and III) , and, (b) impedance behavior (and VSWR characteristics) of U-slot antennas on low, medium and high permittivity substrates, show that method III is generally superior to methods I and II. Additionally, since the overall U-Slot patch dimensions follow the relation W L ≈ 1.385 (methods I and III), and, W L ≈ 2.0 (method II), U-Slot designs via methods I and III have lower cross-polar levels in the principal (φ = 0 • , 90 •) planes compared to those obtained via method II.

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Electromagnetic Coupling Analysis of Printed Circuit Board Traces using Characteristic Mode Analysis

In this paper, the characteristic mode analysis (CMA) has been used to quantify external electrom... more In this paper, the characteristic mode analysis (CMA) has been used to quantify external electromagnetic (EM) field coupling to a realistic printed circuit board (PCB) and to its traces. In our analysis, we show how the location of a trace on a PCB is important in determining the EM field coupling and we illustrate how CMA can be used to optimize the location of a PCB trace for interference control.

Probe-location Optimization in a Wideband Microstrip Patch Antenna using Genetic Algorithm, Particle Swarm and Nelder-Mead Optimization Methods

2021 International Applied Computational Electromagnetics Society Symposium (ACES), 2021

A comparison among three different optimization algorithms, for seeking the best probe location i... more A comparison among three different optimization algorithms, for seeking the best probe location in a wideband microstrip patch antenna, with the objective of bandwidth enhancement, is presented in this paper. As an illustrative example, a rectangular microstrip patch antenna is designed on a TMM-6 substrate, at a center frequency of 3.75 GHz, using the design approach proposed earlier by the present authors. The initial probe location of the design, which is shown to yield 32.66 % 2: 1 VSWR bandwidth, is further optimized using the in-built Genetic Algorithm (GA), Particle Swarm Optimization (PSO) and Nelder-Mead Simplex algorithms, that are available in FEKO.

Nonuniformity in a class of UTD curved surface fields near smooth, convex surfaces

1992 Symposium on Antenna Technology and Applied Electromagnetics, 1992

Two different creeping wave formulations are examined in this paper. One is valid for source and ... more Two different creeping wave formulations are examined in this paper. One is valid for source and field points on or near the curved surface, the other is valid for source and field points off the curved surface. This paper uses a numerical experiment with a circular cylinder to determine at which height the two different formulations overlap.

Techniques for bandwidth optimization of probe-fed microstrip antennas on small, finite ground planes

ABSTRACT

An Empirical Approach for Design of Wideband, Probe-Fed, U-Slot Microstrip Patch Antennas on Single-layer, Infinite, Grounded Substrates

Applied Computational Electromagnetics Society Journal, 2003

Wideband microstrip antennas with relatively simple topologies continue to attract attention for ... more Wideband microstrip antennas with relatively simple topologies continue to attract attention for design of compact, high-performance communication systems. The coaxially-fed, rectangular patch U-slot has recently been investigated numerically and experimentally, and shown to yield 10 dB return-loss bandwidths in excess of 20%. How- ever there are no analytical models, nor any systematic de- sign procedures currently available that can aid realizing these configurations. To that end, based on extensive CAD simulation results for a wide range of commercially avali- able microwave substrates ( to ), an empirical design methodology is derived and illustrated by examples. It is shown that the present empirical design technique, with its attendant limitations, generate wideband U-Slot designs that are optimized using CAD tools such as IE3D within a few iterations, resulting in substantially reduced overall process cycles.

Effects of mutual coupling in a high fidelity, circularly polarized, probe-fed, two-element pentagonal patch array

ABSTRACT

Effects of ground plane shape on performance of probe-fed, circularly polarized, pentagonal patch antenna

ABSTRACT

Mutual Coupling Characterization of Ultra-Wideband U-Slot Microstrip Patch Array Antennas

─ Ultra-wideband (UWB) phased arrays are increasingly used in radar and medical applications. Mut... more ─ Ultra-wideband (UWB) phased arrays are increasingly used in radar and medical applications. Mutual coupling reduction between the phased array elements is critical in achieving good scan bandwidth. This study investigates the mutual coupling of a UWB U-slot microstrip patch 2-element array to find the patch orientation and U-slot topology with the least mutual coupling. Electromagnetic (EM) simulation results indicate that, for εr = 2.2 substrate, diamond patch orientation with opposite U-slot topology has the least coupling between the array elements. Results also indicate that the current density distribution on the microstrip patch has an effect on mutual coupling between the array elements. Results show good agreement between MoM and FEM EM solvers. Index Terms ─ Arrays, FEM, L-probe, microstrip, MoM, mutual coupling, U-slot, UWB.

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Ultra-Wide Bandwidth Enhancement of Single-Layer Single-Feed Patch Antenna Using the Theory of Characteristic Modes

─ The Theory of Characteristic Modes (TCM) is proposed as a systematic approach to antenna design... more ─ The Theory of Characteristic Modes (TCM) is proposed as a systematic approach to antenna design to achieve the goal of finding the antenna structure with optimum broadband behavior. This theory provides a physical insight to the radiating nature of microstrip patch antennas and reduces the design optimization time. In this work, the resonant behavior of the highly radiating structure of the single U-slot rectangular patch on a single-layer εr = 4.4 substrate is analyzed using TCM. Modal analysis of this single-layer structure with different single feed excitations concludes that VSWR ≤ 2 impedance bandwidth in the order of 96% can be achieved with a single T-probe feed. Experimental results, included here, show VSWR ≤ 2 impedance bandwidth in the order of 71%. Index Terms ─ Bandwidth broadening, characteristic mode analysis, L-probe, microstrip patch antennas, Tprobe, theory of characteristic modes, U-slot, UWB.

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Ultra-Wideband Low Profile , U-Slot Microstrip Patch Antennas : L-Probe Feed Design Guidelines

─ The need for low-profile and ultra-wideband (UWB) antennas is rising in wireless communication ... more ─ The need for low-profile and ultra-wideband (UWB) antennas is rising in wireless communication and medical applications. The method of dimensional invariance, which is a class of U-slot patch design methods, is utilized to realize an initial, low-profile, wideband design. Building on this initial wideband design, this study establishes ideal L-probe feed dimensions through extensive parametric study on εr = 2.2 and 4.5 substrates to propose empirical guidelines for the design of L-probe feeds which yield first-pass optimum impedance bandwidth. The established ideal L-probe dimensions, after further extrapolation, are used successfully on other substrates, εr = 3.27, 6.0 and 9.2, for the design of first-pass L-probe feeds which yield impedance bandwidth over 55%, 60%, and 53%, respectively. The results of three commercially available EM simulation solvers show good agreement. Index Terms ─ FEM, L-probe, microstrip patch antenna, MoM, U-slot, UWB.

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Location of Surface Wave Poles in Sommerfeld type Integrals: A Mittag-Leffler Expansion Approach

2019 URSI International Symposium on Electromagnetic Theory (EMTS), 2019

In this paper, the Mittag-Leffler (ML) expansion method is introduced to find surface and leaky w... more In this paper, the Mittag-Leffler (ML) expansion method is introduced to find surface and leaky wave poles. The ML expansion method replaces the trigonometric functions present in Sommerfeld type integrals with equivalent expansion functions. One of the many applications is to solve for multilayered media Green’s functions that are needed to calculate currents on microstrip patch antennas and interconnects. The ML expansion method has been applied and tested on microstrip problems with various dielectric per-mittivities, for electrically thick and thin substrates and for lossless and lossy cases.

Time Domain Analysis of an UWB Electrically Small Microstrip Patch Antenna

2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (AP-S/URSI)

Some Investigations into Mutual Coupling Analysis for Trade Space Studies of Linear Arrays

2019 IEEE International Symposium on Phased Array System & Technology (PAST)

Results for assessing the effects of mutual coupling on important array parameters such as direct... more Results for assessing the effects of mutual coupling on important array parameters such as directivity and bandwidth are presented for examining tradeoffs. A linear, equispaced 25 element dipole array was chosen as a test model to obtain results for uniform, Dolph-Chebyshev and Taylor amplitude distributions. A closed-form formula for the directivity, excluding mutual coupling, was derived to facilitate the computations for the arbitrarily excited, equispaced dipole array. The information gleaned from the results suggests that array mutual coupling, effected by inter element spacings, has significant impact on array directivity but does not similarly affect the array bandwidth. The influence of the scan angle and sidelobe level on the array bandwidth and directivity, for different excitations, have also been reported.

On the Location of Transverse Electric Surface Wave Poles for Electrically Thick Substrates

2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, 2019

In this paper, the transverse electric (TE) surface wave (SW) poles for a grounded single dielect... more In this paper, the transverse electric (TE) surface wave (SW) poles for a grounded single dielectric layer are determined using Mittag-Leffler (ML) expansion method. The poles located using ML expansion method are then compared against existing methods in terms of convergence to final root. This paper shows the effectiveness of ML expansion method by locating SW poles for lossless and lossy dielectric substrates. This method also possess the capability of obtaining more than one SW pole for electrically thick substrates.

Some new techniques for evaluating Sommerfeld integrals for microstrip antenna analysis

2016 URSI International Symposium on Electromagnetic Theory (EMTS), 2016

A new transformation for evaluating Sommerfeld integrals is derived here when the path is deforme... more A new transformation for evaluating Sommerfeld integrals is derived here when the path is deformed in the upper half of the complex plane. This transformation has the feature that as the lateral separation ρ → ∞, the argument of the Bessel function diminishes. It is argued that this approach shall facilitate much efficient calculation of Sommerfeld integrals.

On the Optimum Substrate Selection in a Wideband Microstrip Patch Antenna Design

2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (AP-S/URSI)

This paper provides a general guideline to reduce surface wave (SW) excitation in a microstrip pa... more This paper provides a general guideline to reduce surface wave (SW) excitation in a microstrip patch antenna, while maintaining wide impedance bandwidth and a stable gain performance. The design approach involves efficient selection of substrate parameters such that only a lower magnitude of the dominant TM0 mode is excited, while restricting the excitation of all higher order SW modes. Results from the proposed design approach show that very wide antenna bandwidth, reduced E-plane coupling and stable boresight gain can be obtained.

Performance Optimization of a Microstrip Patch Antenna using Characteristic Mode and D/Q Analysis

2020 XXXIIIrd General Assembly and Scientific Symposium of the International Union of Radio Science

A >30% 2:1 VSWR bandwidth using a coaxially fed microstrip patch antenna along the patch diagonal... more A >30% 2:1 VSWR bandwidth using a coaxially fed microstrip patch antenna along the patch diagonal has been designed within the framework of two optimization techniques and is the focus of this work. For a center frequency (fc) of 3.6 GHz, 53.5% bandwidth is achieved when the feed probe is placed at 2/3 rd distance along the diagonal compared to a 15.7% bandwidth obtained, using the conventional offset fed design. Full wave simulation results are obtained by the FEKO solver and compared with measured data. Characteristic Mode Analysis (CMA) has been performed to identify the dominant eigencurrent modes, in the designed antennas. The approximate Quality Factors Q, applicable to electrically small antennas (ESAs), have been compared to the exact Q of the antenna calculated via antenna input impedance. Performance optimization of the antenna, in terms of both near-and farfield parameters, using the D/Q element optimization technique, has been investigated.

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