A 340 GHz high Gaussicity smooth spline horn antenna for the STEAMR instrument

Hammar, Arvid; Karandikar, Yogesh B.; Forsberg, Per; Emrich, Anders; Stake, Jan

doi:10.1109/aps.2014.6904655

Cited by 15 publications

(8 citation statements)

References 5 publications

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“…4. The predicted -10 dB beamwidth is very close to requirements and the Gaussicity exceeds 99.2% over the full 30 GHz bandwidth, exceeding that reported for similar designs [5].…”

Section: Smooth-walled Spline Profile Designsupporting

confidence: 59%

High Gaussicity feedhorns for sub-/ millimeter wave applications

Robertson

McKay

Hunter

et al. 2016

2016 41st International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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Abstract-In feedhorn design, the power coupling to the fundamental free-space LG 00 mode, or Gaussicity, is a good proxy for high performance, particularly the sidelobe and crosspolar levels and the near-field behavior. Gaussicity can be maximized by ensuring that the first few horn modes reach the aperture with the appropriate phase and amplitude relationship. We present two feedhorn designs for which the Gaussicity was maximized in order to achieve high performance. The first is a 94 GHz corrugated horn with a tanh-linear profile, manufactured by electroforming, which achieves a Gaussicity of 99.92% at band center and sidelobes at the -60 dB level. The second is a 340 GHz smooth-walled spline horn which achieves a Gaussicity of >99.2% over a 10% bandwidth, sidelobes below -30 dB and excellent near-field behavior. This design has been successfully fabricated in E-plane split block suitable for low volume manufacture, for example for imaging arrays.

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“…4. The predicted -10 dB beamwidth is very close to requirements and the Gaussicity exceeds 99.2% over the full 30 GHz bandwidth, exceeding that reported for similar designs [5].…”

Section: Smooth-walled Spline Profile Designsupporting

confidence: 59%

High Gaussicity feedhorns for sub-/ millimeter wave applications

Robertson

McKay

Hunter

et al. 2016

2016 41st International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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“…The values of gaussicity were obtained by calculating the coupling integral, as described in [95], between the far field radiation patterns and their respective Gaussian fit curves. These values are close to 97% at the three key analysis frequency, which make these horns comparable with high performance corrugated horns, whose gaussicity is in the order of 98% [110].…”

Section: Analysis Of Far Field Beam Pattern Simulationssupporting

confidence: 59%

Instrumentation development of innovative radio-devices to improve the coming cycles of radio astronomy observations

Montofre

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Radio astronomy represents one of the most useful tools for investigating celestial objects such as psychrontronic emissions from quasar, molecular clouds in the interstellar medium, and a black hole event horizon. All this is possible due to the great sensitivity that astronomical receivers can achieve, and the high angular resolution that can be reached using interferometric techniques. However, despite the great effort made, radio astronomy is not exempt of limitations that prevent it from deploying its maximum capability in terms of resolution. Atmospheric phase fluctuations, mainly induced by turbulent currents, are primarily responsible. Failure to correct these phase fluctuations will impede that the maximum potential of radio astronomy can be realized. In this thesis work, a novel solution to solve the drawbacks related to phase fluctuations in high frequency observations is presented. The ALMA telescope has been selected as a target. The idea is to use an external optical system at room temperature which can illuminate a low and a high frequency receiver, simultaneously. In this way, the solution for the phase fluctuation can be transferred from low to high frequency, thus, extending the maximum baseline for interferometric observations at high frequencies. ix especial si usted es alguna de aquellas personas que siente que su nombre debiese estar incluido en estas páginas. Estoy sumamente consciente de que he omitido a muchas personas que también colaboraron en todo esto, pero bueno, el mundo nunca ha sido un lugar donde siempre se recibe lo que es merecido. Si bien no estoy del todo contento con esto, pero considerando que ya está escrito, que se quede así como está.

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“…The manufacturing difficulties are significant for corrugated horn-based FPAs at the millimeter and submillimeter frequencies. As an alternative solution, smooth-walled spline horn antennas have been proposed in [17] and [18]. Although such smooth-walled horns are typically characterized by slightly better aperture efficiencies compared with corrugated horns, they can only provide narrower operational bandwidth than corrugated ones due to their increased lengths.…”

Section: State-of-the-art In Tightly Spaced Fpasmentioning

confidence: 99%

“…are typically characterized by a low taper efficiency of the reflector feed. Instead, for focal plane arrays, Vivaldi [8], [9], corrugated horn [11]- [16] or spline horn antennas [17], [18] are the most widely used antennas at low frequencies. These later antennas can provide relatively low sidelobes and crosspolarization levels at a moderate bandwidth with higher taper efficiencies than the single feed systems.…”

Section: Introductionmentioning

confidence: 99%

A Dual-Polarized Leaky Lens Antenna for Wideband Focal Plane Arrays

Yurduseven

Juan

Neto

2016

IEEE Trans. Antennas Propagat.

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This paper presents the design and measurements of a wideband dual polarized leaky lens antenna suitable for tightly spaced focal plane arrays. The antenna is composed of two crossed leaky slots fed by two orthogonal microstrips to realize the dual-polarization operation. The crossed microstrips are fed differentially in order to couple the radiation into the slots. The slots are then coupled to a dielectric lens to achieve directive patterns suited for feeding large Focal distance to Diameter ratio reflectors. In this paper, the proposed leaky lens antenna is optimized to achieve high aperture efficiency with clean symmetric patterns in both polarizations exceeding an octave bandwidth. The concept is validated by the measurements of the primary fields inside the lens and with GRASP simulations of the focal plane array.Index Terms-Broadband antennas, dual-polarization, leaky lens antennas.

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A 340 GHz high Gaussicity smooth spline horn antenna for the STEAMR instrument

Cited by 15 publications

References 5 publications

High Gaussicity feedhorns for sub-/ millimeter wave applications

High Gaussicity feedhorns for sub-/ millimeter wave applications

Instrumentation development of innovative radio-devices to improve the coming cycles of radio astronomy observations

A Dual-Polarized Leaky Lens Antenna for Wideband Focal Plane Arrays

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