Design and Characterization of an Active Impedance Matched Low-Noise Phased Array Feed

Warnick, Karl F.; Carter, D; Webb, Taylor D.; Landon, Jonathan; Elmer, Michael; Jeffs, Brian D.

doi:10.1109/tap.2011.2122223

Cited by 37 publications

(23 citation statements)

References 22 publications

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“…This simulation allowed us to change any set of parameters to perform a detailed verification. The presented model is further verified against models in [29] in Section V.…”

Section: Verification Of the Embedded-lna Noise Modelmentioning

confidence: 91%

Low-Noise Amplifier Design Considerations For Use in Antenna Arrays

Belostotski

Veidt

Warnick

et al. 2015

IEEE Trans. Antennas Propagat.

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This work analyzes the implications of noise coupling in arrays of antennas on the design of low-noise amplifiers (LNAs). To select LNA design parameters in a manner familiar to LNA designers, the effective noise temperatures T ef f of LNAs are presented. The effect of beamformer coefficients and antenna coupling on T ef f is analyzed in a manner similar to a stand-alone LNA analysis. This leads to the proposed LNA design strategy of selecting LNA Γopt near the reflection coefficient of antenna ports and selecting the largest practical |S11| with a proper phase. This strategy is based on the assumption that the antenna array may be used for various beamforming and nonbeamforming applications, unknown at the time of the design. Numerical simulations of a 38-and 41-element antenna arrays show that a global search of LNA S11 and Γopt, which result in the minimum average beamequivalent receiver noise temperature Trec, finds nearly identical results to the proposed LNA design strategy. For a 41-element array with high antenna coupling at low frequencies, the proposed method shows as much as 80% improvement in the Trec over conventional LNA design strategies that do not account for the intended use of the amplifier in an array.

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“…This simulation allowed us to change any set of parameters to perform a detailed verification. The presented model is further verified against models in [29] in Section V.…”

Section: Verification Of the Embedded-lna Noise Modelmentioning

confidence: 91%

Low-Noise Amplifier Design Considerations For Use in Antenna Arrays

Belostotski

Veidt

Warnick

et al. 2015

IEEE Trans. Antennas Propagat.

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“…Measurement results of the array noise temperature will be presented in Section III, showing state-of-the-art noise performance for a room temperature AA-tile. Comparable performance has been recently shown for a smaller array in [24], but only measured data for single channel receiver noise temperatures are presented there. Results from our measurements are full array noise temperatures and will be presented for various beam configurations, both with analog and digital beam forming.…”

Section: Introductionmentioning

confidence: 91%

Experimental Results for the Sensitivity of a Low Noise Aperture Array Tile for the SKA

Woestenburg

Bakker

Ivashina

2012

IEEE Trans. Antennas Propagat.

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Aperture arrays have been studied extensively for application in the next generation of large radio telescopes for astronomy, requiring extremely low noise performance. Prototype array systems need to demonstrate the low noise potential of aperture array technology. This paper presents noise measurements for an Aperture Array tile of 144 dual-polarized tapered slot antenna (TSA) elements, originally built and characterized for use as a Phased Array Feed for application in an L-band radio astronomical receiving system. The system noise budget is given and the dependency of the measured noise temperatures on the beam steering is discussed. A comparison is made of the measurement results with simulations of the noise behavior using a system noise model. This model includes the effect of receiver noise coupling, resulting from a changing active reflection coefficient and array noise contribution as a function of beam steering. Measurement results clearly demonstrate the validity of the model and thus the concept of active reflection coefficient for the calculation of effective system noise temperatures. The presented array noise temperatures, with a best measured value of 45 K, are state-of-the-art for room temperature aperture arrays in the 1 GHz range and illustrate their low noise potential.

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“…Processing of the array elements is typically done in the digital domain, introducing the possibility of optimizing the main lobe or sidelobes (perhaps even dynamically) and performing interference mitigation by nullforming; see, e.g., Landon et al (2010). Experimental phased array feeds have been demonstrated on small axisymmetric prime-fed systems (see in particular Elmer et al 2012) and on Arecibo (Warnick et al 2011) and will soon become the primary (permanent) feed systems for the WSRT and ASKAP (section "Other Prominent Interferometer-Type Radio Telescopes").…”

Section: Single-dish Instrumentsmentioning

confidence: 99%

Antennas in Radio Telescope Systems

Ellingson

2015

Handbook of Antenna Technologies

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Radio astronomy is the study of the universe by measurement of radio frequency emission at frequencies ranging from a few MHz to the far infrared. Signals of interest are typically extraordinarily weak, necessitating large effective aperture and resulting in some of the world's largest antenna systems. Technologies now commonly employed include reflector antennas ("dishes") using horn-type feeds or feed arrays, beamforming arrays consisting of elements ranging from dipoles to large dishes, and interferometry. Many problems in radio astronomy also require very fine angular resolution, leading to aperture synthesis imaging instruments consisting of antennas distributed over apertures ranging from hundreds of meters to intercontinental distances. This chapter provides a brief review of antenna systems used in operational modern radio telescopes and in anticipated new radio telescopes.

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Design and Characterization of an Active Impedance Matched Low-Noise Phased Array Feed

Cited by 37 publications

References 22 publications

Low-Noise Amplifier Design Considerations For Use in Antenna Arrays

Low-Noise Amplifier Design Considerations For Use in Antenna Arrays

Experimental Results for the Sensitivity of a Low Noise Aperture Array Tile for the SKA

Antennas in Radio Telescope Systems

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