A wide-band prime-focus horn for low-noise receiver applications

Thomas, B.; Greene, K.J.; James, G.L.

doi:10.1109/8.102759

Cited by 16 publications

(11 citation statements)

References 4 publications

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“…9 shows the percentage of the total radiated power which misses the reflector and hits the ground when the reflector is pointed normal to the ground. We refer to this quantity as relative power hitting the ground and its definition is stated in (7). We see that the spillover decreases significantly when the ground plane size increases, up to a ground plane size of around 1750 mm after which there is very little reduction of the spillover.…”

Section: Numerical Designmentioning

confidence: 94%

“…In particular, corrugated horns were used to produce very good performance in terms of symmetry of the main lobe and cross polarization. They were and still are popular as feeds for dual reflector antennas, and they can have octave bandwidth [6], [7]. Corrugated horns are expensive and heavy, so simpler dielectric alternatives have been proposed [8].…”

Section: Introductionmentioning

confidence: 99%

“…He received the M.S.E.E., Ph.D., and Doctor Technicae degrees from the Norwegian Institute of Technology (NTH), Trondheim, Norway, in 1976, 1982, and 1990, respectively.…”

mentioning

confidence: 99%

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The Eleven Antenna: A Compact Low-Profile Decade Bandwidth Dual Polarized Feed for Reflector Antennas

Olsson

Kildal

Weinreb

2006

IEEE Trans. Antennas Propagat.

117

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Abstract-A novel dual polarized ultrawide-band (UWB) feed with a decade bandwidth is presented for use in both single and dual reflector antennas. The feed has nearly constant beam width and 11 dBi directivity over at least a decade bandwidth. The feed gives an aperture efficiency of the reflector of 66% or better over a decade bandwidth when the subtended angle toward the sub or main reflector is about 53 , and an overall efficiency better than 47% including mismatch. The return loss is better than 5 dB over a decade bandwidth. The calculated results have been verified with measurements on a linearly polarized lab model. The feed has no balun as it is intended to be integrated with an active 180 balun and receiver. The feed is referred to as the Eleven antenna because its basic configuration is two parallel dipoles 0.5 wavelengths apart and because it can be used over more than a decade bandwidth with 11 dBi directivity. We also believe that 11 dB return loss is achievable in the near future.Index Terms-Log-periodic antenna, multifunction, reflector antenna, reflector antenna feed, square kilometer array (SKA), ultrawide-band (UWB).

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Section: Numerical Designmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Eleven Antenna: A Compact Low-Profile Decade Bandwidth Dual Polarized Feed for Reflector Antennas

Olsson

Kildal

Weinreb

2006

IEEE Trans. Antennas Propagat.

117

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“…At 1.4 GHz, the H–OH receiver (Thomas, Greene & James 1990), with a system equivalent flux density of ∼40 Jy, was used prior to 1997. From 1997, the multibeam receiver (Staveley‐Smith et al 1996), with a system equivalent flux density of ∼28 Jy, was employed.…”

Section: Observations and Analysismentioning

confidence: 99%

13 years of timing of PSR B1259−63

Wang¹,

Johnston²,

Manchester³

2004

Monthly Notices of the Royal Astronomical Society

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This paper summarizes the results of 13 years of timing observations of a unique binary pulsar, PSR B1259−63, which has a massive B2e star companion. The data span encompasses four complete orbits and includes the periastron passages in 1990, 1994, 1997 and 2000. Changes in dispersion measure occurring around the 1994, 1997 and 2000 periastrons are measured and accounted for in the timing analysis. There is good evidence for a small glitch in the pulsar period in 1997 August, not long after the 1997 periastron, and a significant frequency second derivative indicating timing noise. We find that spin-orbit coupling with secular changes in periastron longitude and projected semimajor axis (x) cannot account for the observed period variations over the whole data set. While fitting the data fairly well, changes in pulsar period parameters at each periastron seem ruled out both by X-ray observations and by the large apparent changes in pulsar frequency derivative. Essentially all of the systematic period variations are accounted for by a model consisting of the 1997 August glitch and step changes in x at each periastron. These changes must be due to changes in the orbit inclination, but we can find no plausible mechanism to account for them. It is possible that timing noise may mask the actual changes in orbital parameters at each periastron, but the good fit to the data of the x step-change model suggests that short-term timing noise is not significant.

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“…Both experiment and simulation results show that such a feed can achieve satisfactory performance in a frequency range of 1.6 : 1. Some improved versions of the wide-flare-angle horn for dual-band or wide-band operations are also available in the literature, e.g., [2][3][4][5][6]. Among these designs, the ratio of the maximum to the minimum operation frequencies is no more than 1.9 : 1.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of a Ku/Ka-Band Wide-Flare-Angle Corrugated Horn Using the Differential Evolution Algorithm

Xie¹,

Jiao²,

Du³

et al. 2016

PIER Letters

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A novel wide-flare-angle corrugated horn covering the full Ku/Ka satellite communication frequency bands is designed and optimized. In order to satisfy the rigorous bandwidth requirements, a spline-profiled smooth section and a corrugated section with ring-loaded slots are introduced into the wide-flare-angle horn design. Instead of the "trial-and-error" method, the Differential Evolution (DE) algorithm is employed to obtain the optimum dimensions of the proposed horn. A prototype of the optimized horn is constructed and measured. Both simulated and measured results show that the proposed horn has good radiation and impedance performance. The performance of the horn is also demonstrated as a feed in a typical dual-reflector antenna. Simulation results show that the overall antenna system meets the usual performance requirements.

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A wide-band prime-focus horn for low-noise receiver applications

Cited by 16 publications

References 4 publications

The Eleven Antenna: A Compact Low-Profile Decade Bandwidth Dual Polarized Feed for Reflector Antennas

The Eleven Antenna: A Compact Low-Profile Decade Bandwidth Dual Polarized Feed for Reflector Antennas

13 years of timing of PSR B1259−63

Optimal Design of a Ku/Ka-Band Wide-Flare-Angle Corrugated Horn Using the Differential Evolution Algorithm

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