Ultrawideband Array With 70° Scanning Using FSS Superstrate

Yetisir, Ersin; Ghalichechian, Nima; Volakis, John L.

doi:10.1109/tap.2016.2594817

Cited by 197 publications

(85 citation statements)

References 24 publications

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“…1) and H-plane at broadside Note that the coaxial transition allows 2D scanning (refer to Section III) and does not require a corporate feed network or quasi-optical system, as in [5]. It is worth mentioning that connected arrays can provide a similar performance [11]- [13].…”

Section: Antenna Designmentioning

confidence: 99%

An $8\times 4$ Continuous Transverse Stub Array Fed by Coaxial Ports

Zhou

Ettorre

Grbic

2019

Antennas Wirel. Propag. Lett.

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Continuous transverse stub arrays are wide band, wide scanning antennas consisting of an arrangement of long slots or parallel plate waveguide apertures radiating in free space. A line source is generally required to feed these arrays. Here, we show that such a line source can be created over the radiating aperture using a 2D arrangement of coaxial probe transitions. The coaxial transitions are directly integrated into the parallel plate waveguides feeding the slots. Such a solution avoids using quasi-optical systems or bulky corporate networks to feed the array. The proposed 2D feeding scheme also allows steering the main beam of the array. This is an additional benefit with respect to previous designs for which scanning was limited to a single plane. An array of 8×4 elements validates the concept at 5.8 GHz. Measurements show that the array exhibits a field of view of ±30 • in elevation over the 5.4 − 6.2 GHz band, with an active reflection coefficient for the central elements better than −10 dB.

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Section: Antenna Designmentioning

confidence: 99%

An $8\times 4$ Continuous Transverse Stub Array Fed by Coaxial Ports

Zhou

Ettorre

Grbic

2019

Antennas Wirel. Propag. Lett.

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“…4). Likewise, up to 6:1 bandwidth have been demonstrated while scanning down to 70 • from broadside in all scan planes [10]. The architecture is based on tightly coupled dipole arrays (TCDA) with capacitive coupling that serves to cancel the ground plane's inductance [11].…”

Section: Ultra-wideband Tightly Coupled Arraymentioning

confidence: 99%

“…As seen, the tightly coupled dipole is integrated with a folded Marchand balun serving as the feed and matching network. To enhance scanning performance to low angles, metallic periodic squares, forming a frequency selective surface (FSS), are placed on top of the array [10]. These FSS surfaces are lightweight and can be easily printed on the same board as the dipole array.…”

Section: Ultra-wideband Tightly Coupled Arraymentioning

confidence: 99%

Low Power and Reduced Hardware UWB Beamformers for Future 5G Communications

Volakis

Hokayem

Venkatakrishnan

et al. 2019

IEICE Trans. Commun.

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We present a novel hybrid beamforming architecture for high speed 5G technologies. The architecture combines several new concepts to achieve significant hardware and cost reduction for large antenna arrays. Specifically, we employ an on-site code division multiplexing scheme to group several antenna elements into a single analog-to-digital converter (ADC). This approach significantly reduces analog hardware and power requirements by a factor of 8 to 32. Additionally, we employ a novel analog frequency independent beamforming scheme to eliminate phase shifters altogether and allow for coherent combining at the analog front-end. This approach avoids traditional phase-shifter-based approaches typically associated with bulky and inefficient components. Preliminary analysis shows that for an array of 800 elements, as much as 97% reduction in cost and power is achieved using the hybrid beamformer as compared to conventional beamformer systems.

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“…current sheet) radiators placed above a ground plane, many of which are covered by superstrate dielectrics. Vertically-integrated arrays include but are not limited to the Bunny-ear [67,74], connected-dipole arrays [20], balanced antipodal Vivaldi antennas (BAVA) [75][76][77], and printed dipoles with integrated baluns [22,78,79].…”

Section: Vertically-integrated Uwb Arraysmentioning

confidence: 99%

“…Further advancements in unbalanced-fed UWB-ESAs include a modified BAVA array that offers 10:1 bandwidth [19]. This array provides the widest reported bandwidth for low-profile arrays, and a very convenient, mod- [79]; this comes at the expense of a truncated unit cell dimension to improve E-plane scan matching (i.e. 82% aperture sampling rate) and an increased profile of H = 0.9λ g .…”

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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Ultrawideband Array With 70° Scanning Using FSS Superstrate

Cited by 197 publications

References 24 publications

An $8\times 4$ Continuous Transverse Stub Array Fed by Coaxial Ports

An $8\times 4$ Continuous Transverse Stub Array Fed by Coaxial Ports

Low Power and Reduced Hardware UWB Beamformers for Future 5G Communications

Low Cross-Polarization Vivaldi Arrays

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