Ultrawideband All-Metal Flared-Notch Array Radiator

Kindt, Rick W.; Pickles, William R.

doi:10.1109/tap.2010.2071360

Cited by 175 publications

(63 citation statements)

References 23 publications

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“…As a consequence of the long flare length, the frequency bandwidth of the radiator is increased. Further details on the element can be found in [3]. , the element pattern shows x-pol.…”

Section: A Flared Notch Examplementioning

confidence: 99%

“…To illustrate this, Fig. 7 shows the correction procedure applied to the element pattern of a central element of the 8x8 array previously introduced in [3]. The correction is applied at 29 degrees, and it is clear from Fig.…”

Section: B Applying the Correction Proceduresmentioning

confidence: 99%

“…However, it is also generally true that increasing the length of the flared notch has a negative impact on polarization characteristics. In general, the polarization degradation in the D-plane tends to be more severe in longer flared notches and similarly worse at higher frequencies, as shown in [2] [3]. The nature of this degradation and the relationship it has with frequency and the length/width (L/W) ratio of the radiator is examined in section II.…”

Section: Introductionmentioning

confidence: 99%

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Polarization correction in dual-polarized phased arrays of flared notches

Kindt

Taylor

2011

2011 IEEE International Symposium on Antennas and Propagation (APSURSI)

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Abstract-Though flared-notch radiators are capable of achieving very large bandwidths (10:1 or more) as radiating array elements, they are known to suffer from poor polarization purity when scanning in the diagonal plane (D-plane). This paper examines the polarization properties of dual-polarized arrays of flared notches as a function of frequency and the length/width ratio of the elements. Further, it is demonstrated through a combination of simulation and measurements that polarization degradation can largely be corrected for elements that have orthogonal feed ports. Though correctable, due to the nature of the polarization degradation that occurs in the D-plane, it is also shown that there is a limitation to the extent of correction that can be achieved.

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“…As a consequence of the long flare length, the frequency bandwidth of the radiator is increased. Further details on the element can be found in [3]. , the element pattern shows x-pol.…”

Section: A Flared Notch Examplementioning

confidence: 99%

Section: B Applying the Correction Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polarization correction in dual-polarized phased arrays of flared notches

Kindt

Taylor

2011

2011 IEEE International Symposium on Antennas and Propagation (APSURSI)

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“…The most common way to implement two orthogonal polarizations with Vivaldi antennas is to place them orthogonally along the outer edge of each element [20][21][22]. Another way to implement a wideband dual polarized antenna is to orientate two Vivaldi antennas into a cross-shape with respect to the antenna center where a galvanic contact is avoided by a small longitudinal gap between antenna elements [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Dual Polarized Dual Fed Vivaldi Antenna for Cellular Base Station Operating at 1.7–2.7 GHz

Sonkki

Myllymäki

Putaala

et al. 2017

International Journal of Antennas and Propagation

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The paper presents a novel dual polarized dual fed Vivaldi antenna structure for 1.7-2.7 GHz cellular bands. The radiating element is designed for a base station antenna array with high antenna performance criteria. One radiating element contains two parallel dual fed Vivaldi antennas for one polarization with 65 mm separation. Both Vivaldi antennas for one polarization are excited symmetrically. This means that the amplitudes for both antennas are equal, and the phase difference is zero. The orthogonal polarization is implemented in the same way. The dual polarized dual fed Vivaldi is positioned 15 mm ahead from the reflector to improve directivity. The antenna is designed for −14 dB impedance bandwidth (1.7-2.7 GHz) with better than 25 dB isolation between the antenna ports. The measured total efficiency is better than −0.625 dB (87%) and the antenna presents a flat, approximately 8.5 dB, gain in the direction of boresight over the operating bandwidth whose characteristics promote it among the best antennas in the field. Additionally, the measured cross polarization discrimination (XPD) is between 15 and 30 dB and the 3 dB beamwidth varies between 68 ∘ and 75 ∘ depending on the studied frequency.

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“…1.28 Summary of bandwidth and cross-polarization ratio (CPR) trends of some state-of-the-art low-loss high efficiency UWB-ESAs with VSWR<2 broadside and little-to-no external components [17,19,55,56,89,91,103] …”

mentioning

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 All-Metal Flared-Notch Array Radiator

Cited by 175 publications

References 23 publications

Polarization correction in dual-polarized phased arrays of flared notches

Polarization correction in dual-polarized phased arrays of flared notches

Dual Polarized Dual Fed Vivaldi Antenna for Cellular Base Station Operating at 1.7–2.7 GHz

Low Cross-Polarization Vivaldi Arrays

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