Wideband Arrays

Croswell, W.; Durham, Tim; Jones, Mark; Schaubert, D.H.; Friederich, P.G.; Maloney, J.G.

doi:10.1002/9780470294154.ch12

Cited by 25 publications

(7 citation statements)

References 21 publications

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“…Large vertical current-lengths ( vn ) lead to poor CPR in high-profile Vivaldi arrays, while low-profile arrays have smaller vn to yield good CPR. successful demonstrations of low-profile UWB-ESA technologies, none of these arrays have yet demonstrated the impedance prowess of a high-performance Vivaldi array without resulting in significant losses due to impedance mismatch, resistive loading, or external devices [93]. This work will take a different approach from this line-of-thought.…”

Section: Design Conceptmentioning

confidence: 99%

“…Although a few of the discussed arrays can exhibit UWB performance with >8:1 BWRs, they also require the use of additional lossy devices and components. Such devices include lossy wideband external baluns and lossy screens and R-cards [88,93] that are respectively used to ensure balanced feed lines and to suppress resonances from the ground plane. As a result, these factors can decrease the radiation efficiency (typically between 2-3 dB of losses) and array power handling.…”

Section: "Quasi-planar" Uwb Arraysmentioning

confidence: 99%

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Low Cross-Polarization Vivaldi Arrays

Logan

Kindt

Vouvakis

2018

IEEE Trans. Antennas Propagat.

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ACKNOWLEDGMENTSI would like to begin by extending my gratitude for having the opportunity and privilege to study under the guidance of my advisor, Prof. Marinos Vouvakis, over the course of five years for my Master's and PhD research. His energy, drive, and motivation to not only teach but also to stimulate critical thinking, to invoke a practical mindset, and to create with meaning have left me with invaluable principles. I am indebted to him for challenging me and his endless patience and support throughout this research.I'd like to also thank Prof. Do-Hoon Kwon and Prof. Gopal Narayanan for serving on my dissertation committee and providing many insightful comments and support.I would like to additionally extend my gratitude to Prof. Robert Jackson, Prof.Paul Siqueira, and Prof. Joseph Bardin for serving on my research qualifying exam committee. Also, although I never had the pleasure of having him as a professor at UMass, I'd like to thank Prof. Dan Schaubert for taking the time to inadvertently introduce Vivaldi arrays to a curious kid at a phased array conference nearly six years ago; likewise thanks to Prof. Jorge Salazar for seeing some potential in that kid to encourage him to apply for graduate study at UMass. I appreciate it greatly. Ultra-wideband (UWB) electronically scanned arrays (ESA) with high efficiency, excellent polarization agility, and wide-scan matching remain essential for servicing multifunctional RF front-ends and other communications, sensing, and jamming or countermeasure systems. To this day, the most popular antenna array element in modern UWB-ESA systems is the Vivaldi, or flared notch, due to its superior widescan wide impedance bandwidth, well-known design guidelines, and practical embodiment versatility. Despite their popularity, these arrays tend to radiate unacceptably high cross-polarization levels, thus encouraging a great research opportunity.This dissertation presents the theory and design of a new class of UWB-ESAs, termed Sliced Notch Antenna (SNA) arrays, that remedy the high cross-polarization problems in Vivaldi arrays while maintaining their desirable impedance performance.The critical enabling insight of this work lays in revealing the nature of polarization viii purity or cross-polarization ratio (CPR) degradation in Vivaldi arrays to arise from a highly imbalanced ratio of longitudinal and transverse currents within the element.This work introduces a novel design strategy that intrinsically balances these currents over a UWB operating band, achieving decade-order (10:1) bandwidths and low cross-polarization. Moreover, the design approach is simple, intuitive, and can be implemented in a manner that does not inflate cost expenditures. In fact, the proposed topology can facilitate significantly reduced costs and manufacturing times

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Section: Design Conceptmentioning

confidence: 99%

Section: "Quasi-planar" Uwb Arraysmentioning

confidence: 99%

Low Cross-Polarization Vivaldi Arrays

Logan

Kindt

Vouvakis

2018

IEEE Trans. Antennas Propagat.

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“…Compact wideband baluns are difficult to realize, and previous dipole arrays with self-contained feeds have yielded only modest bandwidths (< 2 : 1) [2], [3]. Wideband TCDAs have therefore typically been realized using "feed-organizers" with bulky external baluns located below the ground plane [4]. This significantly increases the total size, weight, and cost of the array.…”

Section: Introductionmentioning

confidence: 99%

A 6.3∶1 bandwidth scanning Tightly Coupled Dipole Array with co-designed compact balun

Doane

Sertel

Volakis

2012

Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation

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We present a design for a Tightly Coupled Dipole Array (TCDA) with wide angle scanning and a wideband compact balun. Although TCDAs are low profile, capable of wide bandwidth, good scan performance, and low cross polarization, they require a balanced feeding structure whose realization introduces significant practical challenges. Among them is developing a balun that is both compact and wideband. In this paper, we demonstrate a design for a low cost balun that fits within the existing array volume and increases the overall bandwidth of the array. This is accomplished by exploiting the balun's reactance as part of the matching network for the aperture. The final array delivers 6.3 : 1 bandwidth, ±45 • scanning in all planes, and < −10dB cross-polarization. These capabilities are believed to be unique for a low profile array with a self-contained feed.

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“…Advantages of planar array for MFA 1. The choice of number of elements in planar array can overcome the barrier of re-configurability for the need of integration of antenna which maintains high directivity [10].…”

Section: Quantitative Details Of Planar Arraysmentioning

confidence: 99%

Design of multiple function antenna array using radial basis function neural network

Reddy

Vakula

Sarma³

2013

J. Microw. Optoelectron. Electromagn. Appl.

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Wideband Arrays

Cited by 25 publications

References 21 publications

Low Cross-Polarization Vivaldi Arrays

Low Cross-Polarization Vivaldi Arrays

A 6.3∶1 bandwidth scanning Tightly Coupled Dipole Array with co-designed compact balun

Design of multiple function antenna array using radial basis function neural network

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Wideband Arrays

Cited by 25 publications

References 21 publications

Low Cross-Polarization Vivaldi Arrays

Low Cross-Polarization Vivaldi Arrays

A 6.3&#x2236;1 bandwidth scanning Tightly Coupled Dipole Array with co-designed compact balun

Design of multiple function antenna array using radial basis function neural network

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A 6.3∶1 bandwidth scanning Tightly Coupled Dipole Array with co-designed compact balun