Antenna Simulations and Measurements of Focal Plane Array Facet Reflectors

Renker, Matthias; Whale, Mark; Murk, Axel

doi:10.1109/tap.2012.2232264

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…The FPA serves as a mounting structure for two sets of facet surfaces with focusing reflectors. It has been shown in [17] that it can be manufactured as a single unit with excellent optical performance. Since the two sets of facet surfaces are mounted in a significantly different way compared to other reflectors and since fine mechanical precision has been demonstrated, the FPA was modeled as one single unit with no imperfections.…”

Section: Tolerance Analysismentioning

confidence: 99%

Optical Tolerance Analysis of the Multi-Beam Limb Viewing Instrument STEAMR

Hammar

Whale

Forsberg

et al. 2014

IEEE Trans. THz Sci. Technol.

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In this paper, we report on an optical tolerance analysis of the submillimeter atmospheric multi-beam limb sounder, STEAMR. Physical optics and ray-tracing methods were used to quantify and separate errors in beam pointing and distortion due to reflector misalignment and primary reflector surface deformations. Simulations were performed concurrently with the manufacturing of a multi-beam demonstrator of the relay optical system which shapes and images the beams to their corresponding receiver feed horns. Results from Monte Carlo simulations show that the inserts used for reflector mounting should be positioned with an overall accuracy better than 100 m ( 1/10 wavelength). Analyses of primary reflector surface deformations show that a deviation of magnitude 100 m can be tolerable before deployment, whereas the corresponding variations should be less than 30 m during operation. The most sensitive optical elements in terms of misalignments are found near the focal plane. This localized sensitivity is attributed to the off-axis nature of the beams at this location. Post-assembly mechanical measurements of the reflectors in the demonstrator show that alignment better than 50 m could be obtained.

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Section: Tolerance Analysismentioning

confidence: 99%

Optical Tolerance Analysis of the Multi-Beam Limb Viewing Instrument STEAMR

Hammar

Whale

Forsberg

et al. 2014

IEEE Trans. THz Sci. Technol.

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“…The chosen amplitudes of these two hybrid modes produces an aperture distribution with significantly low sidelobe levels at 40 dB thereby maximising the power coupling coefficient to the representative fundamental Gaussian beam at 99.8% [18]. A full treatment of a breadboard model of this FPA is given in [19] and [20].…”

Section: Focal Plane Array (Fpa)mentioning

confidence: 99%

A Compensating Anastigmatic Submillimeter Array Imaging System for STEAMR

Whale

Murphy

Murk

et al. 2013

IEEE Trans. THz Sci. Technol.

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In this paper, we present a novel technique for the removal of astigmatism in submillimeter-wave optical systems through employment of a specific combination of so-called astigmatic off-axis reflectors. This technique treats an orthogonally astigmatic beam using skew Gaussian beam analysis, from which an anastigmatic imaging network is derived. The resultant beam is considered truly stigmatic, with all Gaussian beam parameters in the orthogonal directions being matched. This is thus considered an improvement over previous techniques wherein a beam corrected for astigmatism has only the orthogonal beam amplitude radii matched, with phase shift and phase radius of curvature not considered. This technique is computationally efficient, negating the requirement for computationally intensive numerical analysis of shaped reflector surfaces. The required optical surfaces are also relatively simple to implement compared to such numerically optimized shaped surfaces. This technique is implemented in this work as part of the complete optics train for the STEAMR antenna. The STEAMR instrument is envisaged as a mutli-beam limb sounding instrument operating at submillimeter wavelengths. The antenna optics arrangement for this instrument uses multiple off-axis reflectors to control the incident radiation and couple them to their corresponding receiver feeds. An anastigmatic imaging network is successfully implemented into an optical model of this antenna, and the resultant design ensures optimal imaging of the beams to the corresponding feed horns. This example also addresses the challenges of imaging in multi-beam antenna systems.

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Antenna Simulations and Measurements of Focal Plane Array Facet Reflectors

Cited by 2 publications

References 8 publications

Optical Tolerance Analysis of the Multi-Beam Limb Viewing Instrument STEAMR

Optical Tolerance Analysis of the Multi-Beam Limb Viewing Instrument STEAMR

A Compensating Anastigmatic Submillimeter Array Imaging System for STEAMR

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