On the size requirement for finite phased-array models

Holter, H.; Steyskal, H.

doi:10.1109/tap.2002.1017665

Cited by 84 publications

(28 citation statements)

References 7 publications

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“…Therefore the SEP and active impedance of each element varies considerably [12]. As such, the increased level of cross-polarization near θ = 20 • is not representative of the cross-polarization level while scanning.…”

Section: Finite Array Experimental Resultsmentioning

confidence: 98%

Broadband planar wide-scan array employing tightly coupled elements and integrated balun

Kasemodel¹,

Chen²,

Volakis³

2010

2010 IEEE International Symposium on Phased Array Systems and Technology

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In this paper we present the design, fabrication and demonstration of an X-band phased array capable of wide-angle scanning. A new non-symmetric element for wideband tightly coupled dipole arrays is integrated with a low-profile microstrip balun printed on the array ground plane. The feed connects to the array aperture with vertical twin-wire transmission lines that concurrently perform impedance matching. The proposed element arms are identical near the center feed portion but dissimilar towards the ends, forming a ball-and-cup. A 64 element array prototype is verified experimentally and compared to numerical simulation. The array aperture is placed λ/7 (at 8 GHz) above a ground plane and shown to maintain a VSWR < 2 from respectively.

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Section: Finite Array Experimental Resultsmentioning

confidence: 98%

Broadband planar wide-scan array employing tightly coupled elements and integrated balun

Kasemodel¹,

Chen²,

Volakis³

2010

2010 IEEE International Symposium on Phased Array Systems and Technology

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“…for each scan with the SNA array exhibiting slightly higher values for broadside and 1 As a general rule-of-thumb, the central elements in a planar array will not begin to emulate infinite array performance until the area of the array, A, is proportional to the operating wavelength by A ≈ 25λ 2 [133]. For the measured 19×19 array near the low-band edge, A ≈ λ 2 and thus the array will be electrically small and suffer from low-frequency finite size truncation effects; the central elements will begin to better approximate infinite array performance for frequencies above 6.3 GHz with this array size.…”

Section: Impedancementioning

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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“…We set B l o +l 1 = 0 and X l 2 = 0 in Eqs. (2) and (4). The effective relative permittivity of the CPW is set as 2.94, and that of SL as 2.56.…”

Section: Determination Of Parameters In Equivalent Circuitmentioning

confidence: 99%

“…As the feeder to TSA element, the structure based on a quarter-wavelength transformer is frequently used [2][3][4]. In this method, the open-ended quarter-wavelength MSL and the short-ended quarter-wavelength SL at the specified frequency are crossed between the upper and lower sides of the dielectric substrate to feed the TSA.…”

Section: Introductionmentioning

confidence: 99%

A linear tapered slot antenna electromagnetically coupled with perturbed coplanar waveguide

Matsui

2004

Electron. Comm. Jpn. Pt. I

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SUMMARYThis paper considers a linear tapered slot antenna element with electromagnetically coupled feed and discusses the matching and the radiation characteristics. In the proposed antenna element, the coplanar line with perturbed feeder, that is, the coplanar waveguide, is considered as a coupled slot line. Each line is short-circuited to the ground conductor with different length. By electromagnetic coupling on the single-sided coplanar dielectric substrate, feed to the linear tapered slot antenna element is realized. The following results are obtained. (1) It is possible to control the coupling magnitude and the matching frequency between the antenna element and the feeder. (2) An equivalent circuit is proposed for the matching characteristics, and the circuit parameters are determined. (3) The characteristics obtained by experiment and with an electromagnetic simulator are compared to the characteristics derived from the equivalent circuit. (4) The radiation directivity is of the single-direction end-fire type. A gain of 8.1 dBi and a cross polarization of -16 dB in the front direction are realized. On the basis of these results, it is demonstrated that the proposed antenna element is useful as a planar antenna element.

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On the size requirement for finite phased-array models

Cited by 84 publications

References 7 publications

Broadband planar wide-scan array employing tightly coupled elements and integrated balun

Broadband planar wide-scan array employing tightly coupled elements and integrated balun

Low Cross-Polarization Vivaldi Arrays

A linear tapered slot antenna electromagnetically coupled with perturbed coplanar waveguide

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