Coincident phase center ultra wideband array of dual polarized flared notch elements

Pickles, William R.; Rao, J. B. L.; Patel, Dharmesh P.; Mital, Rashmi

doi:10.1109/aps.2007.4396523

Cited by 16 publications

(3 citation statements)

References 5 publications

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“…This increased thickness permits the LNA to be embedded within the element and will provide excellent electromagnetic shielding. Although thick Vivaldi elements have been described elsewhere [14,15,16], this is the first known attempt to integrate an LNA inside an element.…”

Section: Vivaldi Arraymentioning

confidence: 98%

Development of a low-noise wide-band phased-array feed

Veidt

Burgess

Messing

et al. 2011

2011 XXXth URSI General Assembly and Scientific Symposium

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Low-noise phased-array feeds are a new way to expand the field of view of radio telescopes at centimetre wavelengths. First generation engineering demonstrators of this technology have been constructed and tested by several institutes worldwide. The development of second-generation phased-array feeds is now underway. We describe one effort to design and build an astronomy-capable phased-array feed using techniques to reduce front-end noise and increase system bandwidth.

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Section: Vivaldi Arraymentioning

confidence: 98%

Development of a low-noise wide-band phased-array feed

Veidt

Burgess

Messing

et al. 2011

2011 XXXth URSI General Assembly and Scientific Symposium

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“…Without sacrificing polarization bandwidth, the sole alternative is the design of element pairs with coincident phase centers. One more recent design, due to Pickels, Rao, Patel, and Mital [6] at NRL is conceptually illustrated in Fig. 38.…”

Section: Line-of-sightmentioning

confidence: 99%

Polarization Characteristics of Coherent Waves

Olin¹

2012

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NRL/FR/5317--12-10,210i REPORT DOCUMENTATION PAGE DATES COVERED (From -To) Standard Form 298 (Rev. 8-98)Prescribed by ANSI Std. Z39.18Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Coherent polarized waves, propagating toward and receding from an observer, together with their representation in terms of orthogonal linearly and circularly polarized component pairs are described in some detail. Appropriate matrix formulation facilitates their bases interchange and enables a better understanding of their characteristics, especially in connection with radar or communications related subjects. Component parameters in terms of Poincaré Sphere locations are described and readily characterize measurable relationships among different polarizations. Polarization distortion effects using phased array apertures with dual polarized elements are emphasized and details concerning signal bit resolution and phase center coincidence effects are described and analyzed. An approach to polarization filtering is reviewed and the well known polarization related parameter characterizations, the Ludwig-3 cross-polarized component definition and the Huynen Fork representation of radar target parameters, are described and relevant analyses presented. An illustrative polarization related problem concerning ground-based systems and SATCOM interaction illustrates many of the parameter design considerations described within the report. Throughout the text, numerous derived parametric plots are illustrated which aid in an overall understanding of the major details of this important subject. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S ACRONYM(S) 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S REPORT NUMBER(S) 12-03-2012Formal Report

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“…Wideband coincident phase center radiators often require more complex feeding networks, which may include lossy 3-dB hybrids [1]. So, the decision to choose coincidence or not prior to beginning the design of an array warrants investigation.…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Dual-Polarized, Periodic Arrays of Coincident and Noncoincident Phase Center Radiators

Holzman

2013

IEEE Trans. Antennas Propagat.

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We compare the polarization characteristics of coincident and noncoincident phase center, dual-polarized array antennas. Our analysis generalizes existing work on coincident phase center radiators and examines the dependence of polarization purity on the spatial separation between the two orthogonal sources of an idealized, dual polarized array element. We show that the spatial separation of the sources induces a phi-angle and frequency dependence in the far-field polarization, which vanishes when the sources are coincident. We discuss how attenuators, delay devices and phase shifters can compensate for the spatial separation and angular-dependent properties of the individual source radiation patterns. We also show that over a significant instantaneous bandwidth (20% to 30%) the noncoincident radiator's polarization purity degradation is relatively minor, even at wide scan angles.

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Coincident phase center ultra wideband array of dual polarized flared notch elements

Cited by 16 publications

References 5 publications

Development of a low-noise wide-band phased-array feed

Development of a low-noise wide-band phased-array feed

Polarization Characteristics of Coherent Waves

A Comparison of Dual-Polarized, Periodic Arrays of Coincident and Noncoincident Phase Center Radiators

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