The Banyan Tree Antenna Array

Holland, Steven S.; Vouvakis, Marinos N.

doi:10.1109/tap.2011.2164177

Cited by 57 publications

(21 citation statements)

References 18 publications

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“…Balanced Antipodal Vivaldi Antenna (BAVA) array not only gives wide bandwidth but also enhances other parameters of BAVA [83]. AVA mechanical robustness can be increased by implementing AVA planer structure [84], [85]. Also, the planar structure enhances the gain and bandwidth of AVA.…”

Section: Ava Arraymentioning

confidence: 99%

A Survey of Performance Enhancement Techniques of Antipodal Vivaldi Antenna

2020

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The increasing proliferation of advanced devices for UWB, 5G communication, micrometerwave, and millimeter-wave communication demands an antenna which can handle huge data rates, provides high gain and stable radiation pattern as a panacea of most of the current wireless communication problems. Many different antenna designs have been proposed by the researchers but, Antipodal Vivaldi Antenna (AVA) has drawn the attention of most of the researchers because of its high gain, wide bandwidth, less radiation loss, and stable radiation pattern. Different methods are presented to make AVA more compact while maintaining the performance of an antenna to an acceptable level. These different methods are substrate choice, flare shape, slots, and feeding connectors. Also, AVA performance can be enhanced by incorporating corrugation, dielectric lens, patch in between two flares of AVA, balanced AVA (BAVA), metamaterial, computational intelligence (CI), and AVA array. The AVA performance enhancement techniques modify the electrical and physical properties of an antenna which in turn improves its performance. A large number of performance enhancement methods of AVA design have been proposed, however, no comprehensive study exists to categorize these performance enhancement techniques and outline their concepts, advantages, disadvantages, and applications. So, in this paper, we have attempted to outline all methods available for enhancing and optimizing the parameters of AVA. Additionally, to validate some of the important performance enhancement methods, they are incorporated in the basic conventional AVA design and further simulation results are obtained for the same which are in line with the surveyed literature. Each method is explained in detail by incorporating its key points, merits, and demerits. Moreover, illustrations from the literature are given to demonstrate improvement in the parameters as a result of applying a particular performance enhancement technique. INDEX TERMS Antipodal Vivaldi antenna (AVA), AVA array, balanced antipodal Vivaldi antenna (BAVA), corrugations, dielectric lens, metamaterial, parasitic patch, slots.

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Section: Ava Arraymentioning

confidence: 99%

A Survey of Performance Enhancement Techniques of Antipodal Vivaldi Antenna

2020

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“…To eliminate the necessity of external baluns/hybrids in these arrays, the Banyan Tree Antenna (BTA) [81] array was developed to achieve a 4:1 bandwidth when fed directly with an unbalanced 50Ω feed line by mitigating in-band common-mode resonances with shorting strips connected to the radiating arms as shown in Fig. 1.17.…”

Section: Vertically-integrated Uwb Arraysmentioning

confidence: 99%

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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“…However, a disadvantage of this type of feed is that additional noise appears when using more than one. Nevertheless, with the use of filters the noise can be considerably reduced and linearly polarized feeds can be used even to design arrays with dozens of elements (Holland and Vouvakis, 2011;Colín-Beltrán, 2013;Colín-Beltrán et al, 2013). This means that linearly polarized feeds still represent an option for studying circularly polarized signals, but the need to transform linear to circular polarization and to reduce the noise due to the use of two feeds implies complex electronics.…”

Section: Detection Of Circular Polarizationmentioning

confidence: 99%

“…Planar feeds of different shapes and technical characteristics have been developed in recent years (Ebnabbasi et al, 2010;Holland and Vouvakis, 2011). They are based on microstrip technology which is cheap, light, and simple for manufacturing.…”

Section: Introductionmentioning

confidence: 99%

The Use of Planar Feeds for Solar Radio Observations

et al. 2014

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We describe the results of test observations obtained with a 5-m single-dish radiotelescope (RT5) using novel planar feeds designed to detect circularly polarized emission in the 1.5 -3.9 GHz band. The beam of such feeds is wide; nevertheless, solar scans have been successfully done using feeds at the focus of the primary mirror of the RT5. The sensitivity is about 1 sfu at each polarization and about 1.4 sfu at the I Stokes parameter. We estimate that it is possible to detect flares with fluxes above 5 sfu at the I Stokes parameter.

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The Banyan Tree Antenna Array

Cited by 57 publications

References 18 publications

A Survey of Performance Enhancement Techniques of Antipodal Vivaldi Antenna

A Survey of Performance Enhancement Techniques of Antipodal Vivaldi Antenna

Low Cross-Polarization Vivaldi Arrays

The Use of Planar Feeds for Solar Radio Observations

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