Electromagnetics and Transmission Lines: Essentials for Electrical Engineering, 2nd Edition
WileyR.A. Strangeway, S.S. Holland, J.E. Richie
2022
Electromagnetics and Transmission Lines provides coverage of what every electrical engineer (not just the electromagnetic specialist) should know about electromagnetic fields and transmission lines. This work examines several fundamental electrical engineering concepts and components from an electromagnetic fields viewpoint, such as electric circuit laws, resistance, capacitance, and self and mutual inductances. The approach to transmission lines (T-lines), Smith charts, and scattering parameters establishes the underlying concepts of vector network analyzer (VNA) measurements. System-level antenna parameters, basic wireless links, and signal integrity are examined in the final chapters.
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An Effective Sequence of VNA Experiments for a Junior-Level Electromagnetics Course
IEEE International Symposium on Antennas and PropagationS. S. Holland, D. E. Brocker, R. A. Strangeway
2022
There is a need for incorporating practical high-frequency measurement experiences into an undergraduate electrical engineering (EE) program. This paper presents a sequence of experiments that develops student capabilities in vector network analyzer (VNA) measurements and component specifications formation. Students have demonstrated the effectiveness of this approach by constructing a datasheet for an unspecified RF/microwave filter as a summative experience.
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Investigation of Multiperiodic Dielectric PBGs for Scan Blindness Mitigation in Printed Antenna Arrays
Proceedings of the Allerton Antenna Applications SymposiumKipfer, L.J., Holland, S.S.
2019
Modeling of photonic bandgap effects on scan blindnesses in printed dipole arrays
2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science MeetingHolland, S.S.
2017
An analysis of scanblindness onset angles in printed dipole arrays with perforated dielectric substrates is presented. The periodic grid of air holes in these arrays is shown to produce a photonic bandgap (PBG), which is identified as the root cause of previously observed anomalous behavior in H-plane scans. A basic transmission line unit cell model is developed that incorporates PBG effects, and this updated model is shown to accurately predict scanblindnesseses even in cases where traditional analysis fails. This new model lays the groundwork for investigations into E-plane blindness mitigation using the PBG behavior of perforated dielectric substrates.
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A review of Planar Ultrawideband Modular Antenna (PUMA) Arrays
International Symposium on Electromagnetic TheoryLogan, J.T., Holland, S.S., Schaubert, D.H., Kindt, R.W., Vouvakis, M.N.
2013
Planar Ultrawideband Modular Antenna (PUMA) arrays are low-cost, wide-scan, and low-cross polarization dual-polarized UWB arrays that combine excellent electrical performance with convenient and practical feeding/fabrication processes. Each member of the PUMA array family consists of tightly coupled horizontal dipoles over a ground plane with novel feeding schemes that enable simple PCB fabrication. This feeding eliminates the need for baluns, “cable organizers,” and other external support mechanisms to produce stand-alone, high-efficiency radiators. Additionally, all PUMA arrays consist of dual-offset dual-polarized lattice arrangements for modular, tile-based assembly. This paper will review the basic operation principles of the PUMA arrays followed by the technological evolution of the PUMA array family. Fabricated PUMA arrays and full-wave simulations of structures that can be manufactured with standard fabrication technologies will be shown along with results.
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A 7–21 GHz Dual-Polarized Planar Ultrawideband Modular Antenna (PUMA) Array
IEEE Transactions on Antennas and PropagationHolland, S.S., Schaubert, D.H., Vouvakis, M.N.
2012
The design, fabrication, and measurement of a 16 × 16 dual-polarized planar ultrawideband modular antenna (PUMA) array operating over 7-21 GHz (3:1 bandwidth) are presented. The array is comprised of tightly coupled dipoles printed on a grounded dielectric substrate and are excited by an unbalanced feeding scheme that eliminates external wideband baluns and feed organizers. The array can be assembled modularly, where each low-profile, fully planar, low-cost tile is fabricated using standard multilayer microwave PCB techniques. A unique solderless, modular interconnect mates the array to a dilation fixture that facilitates measurements using standard surface-mount assembly (SMA) connectors and terminations. After presenting the most critical design trends, simulation results of the final array in infinite, infinite × finite, and finite × finite models are compared with measurements. This prototype array exhibits a measured active VSWR.
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The Planar Ultrawideband Modular Antenna (PUMA) Array
IEEE Transactions on Antennas and PropagationS.S. Holland, M.N. Vouvakis
2012
A fully planar ultrawideband phased array with wide scan and low cross-polarization performance is introduced. The array is based on Munk's implementation of the current sheet concept, but it employs a novel feeding scheme for the tightly coupled horizontal dipoles that enables simple PCB fabrication. This feeding eliminates the need for “cable organizers” and external baluns, and when combined with dual-offset dual-polarized lattice arrangements the array can be implemented in a modular, tile-based fashion. Simple physical explanations and circuit models are derived to explain the array's operation and guide the design process. The theory and insights are subsequently used to design an exemplary dual-polarized infinite array with 5:1 bandwidth and VSWR
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The banyan tree antenna array
IEEE Transactions on Antennas and PropagationHolland, S.S., Vouvakis, M.N.
2011
A new wideband, wide-scan array is introduced, called the Banyan Tree Antenna (BTA) array, that employs modular, low-profile, low-cost elements fed directly from standard unbalanced RF interfaces. The elements consist of vertically-integrated, flared metallic fins over a ground plane that are excited by a vertical two conductor unbalanced transmission line. The antenna resembles the bunny-ear or balanced antipodal Vivaldi antenna (BAVA) designs, but most importantly uses metallic shorting posts between the fins and the ground plane that suppress a mid-band catastrophic common-mode resonance that occurs in 2D arrays of balanced radiators fed with unbalanced feeds. This work introduces simple circuit models that describe key performance attributes of the BTA array, leading to unique physical insights and design guidelines. Simulations of infinite single- and dual-polarized BTA arrays have achieved approximately two octaves of bandwidth for VSWR.
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