Search Results - "Lehmensiek, R"

Primary beam effects of radio astronomy antennas – II. Modelling MeerKAT L-band beams by Asad, K M B, Girard, J N, de Villiers, M, Ansah-Narh, T, Iheanetu, K, Smirnov, O, Santos, M G, Lehmensiek, R, Jonas, J, de Villiers, D I L, Thorat, K, Hugo, B, Makhathini, S, Jozsa, G I G, Sirothia, S K

“…ABSTRACT After a decade of design and construction, South Africa’s SKA-MID precursor MeerKAT has begun its science operations. To make full use of the…”
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Engineering and science highlights of the KAT-7 radio telescope by Foley, A. R., Alberts, T., Armstrong, R. P., Barta, A., Bauermeister, E. F., Bester, H., Blose, S., Botha, D. H., Buchner, S. J., Carignan, C., Cheetham, T., Cloete, K., Coreejes, G., Crida, R. C., Cross, S. D., Curtolo, F., Dikgale, A., de Villiers, M. S., du Toit, L. J., Esterhuyse, S. W. P., Fanaroff, B., Fender, R. P., Fijalkowski, M., Fourie, D., Frank, B., George, D., Gibbs, P., Goedhart, S., Grobbelaar, J., Gumede, S. C., Hess, K. M., Hoek, N., Horrell, J., Jonas, J. L., Jordaan, J. D. B., Julie, R., Kapp, F., Kotzé, P., Kusel, T., Langman, A., Lehmensiek, R., Liebenberg, D., Liebenberg, I. J. V., Loots, A., Lord, R. T., Lucero, D. M., Ludick, J., Macfarlane, P., Madlavana, M., Magnus, L., Magozore, C., Manley, J. R., Marais, L., Marais, N., Marais, S. J., Maree, M., Martens, A., Mokone, O., Moss, V., Mthembu, S., New, W., Nicholson, G. D., van Niekerk, P. C., Oozeer, N., Passmoor, S. S., Peens-Hough, A., Pińska, A. B., Prozesky, P., Rajan, S., Ratcliffe, S., Renil, R., Richter, L. L., Rosekrans, D., Rust, A., Schröder, A. C., Schwardt, L. C., Seranyane, S., Serylak, M., Shepherd, D. S., Siebrits, R., Sofeya, L., Spann, R., Springbok, R., Swart, P. S., Thondikulam, Venkatasubramani L., Theron, I. P., Tiplady, A., Toruvanda, O., Tshongweni, S., van den Heever, L., van der Merwe, C., van Rooyen, R., Wakhaba, S., Walker, A. L., Welz, M., Williams, L., Wolleben, M., Woudt, P. A., Young, N. J., Zwart, J. T. L.

“…The construction of the seven-dish Karoo Array Telescope (KAT-7) array in the Karoo region of the Northern Cape in South Africa was intended primarily as an…”
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Creating accurate multivariate rational interpolation models of microwave circuits by using efficient adaptive sampling to minimize the number of computational electromagnetic analyses by Lehmensiek, R., Meyer, P.

“…A fast and efficient adaptive sampling algorithm for multivariate rational interpolation models based on convergents of Thiele-type branched continued…”
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Electromagnetic Analyses and Characterization of the ALMA Band 6 Receiver Optics by Lehmensiek, R., Navarrini, A., Effland, J.

“…We performed a thorough electromagnetic (EM) analysis of the ALMA Band 6 receiver cartridge optics. The current Band 6 receiver's far-field pattern has a large…”
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ALMA Band 6v2 receiver development status by Navarrini, A., Lambert, J. G., Kerr, A. R., Effland, J., Dindo, P., Saini, K., Lehmensiek, R., Vaselaar, D., Handy, A., Casto, B., Astudillo, P., Lichtenberger, A. W., Cyberey, M., Mena, P., Jarufe, C., Hawkins, B.

“…We report on the design of the ALMA "Band 6v2" Superconductor-Insulator-Superconductor (SIS) receiver, an upgraded version of the existing 211-275 GHz ALMA…”
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Primary Beams of the Meer KAT Radio Telescope: Measurements and Simulations by de Villiers, D.I.L., Asad, K.M.B, Smirnov, O., Lehmensiek, R., De Villiers, M., Jonas, J.

“…A comparison of measured and simulated primary beam patterns of the MeerKAT radio telescope is presented. It is shown that the measured data, after removing…”
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Accuracy improvement of approximate noise temperature calculations of offset Gregorian reflector systems by Lehmensiek, R., de Villiers, D. I. L.

“…Calculation of the antenna noise temperature for an offset Gregorian reflector system is computationally intensive. The main reflector masking technique, where…”
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Offset Gregorian reflector shaping for optimum sensitivity by de Villiers, D. I. L., Lehmensiek, R.

“…Dual offset Gregorian reflector shaping can provide improved sensitivity performance by reducing radiometric noise and improving aperture efficiency…”
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Using efficient multivariate adaptive sampling by minimizing the number of computational electromagnetic analysis needed to establish accurate interpolation models by Lehmensiek, R., Meyer, P.

“…An efficient multivariate adaptive sampling algorithm based on rational interpolation, that establishes accurate surrogate models of microwave circuits, is…”
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Compact low loss L-band orthomode transducer by Lehmensiek, R, Theron, I P

“…The design of a wideband orthomode transducer (OMT) with an integrated directional coupler for radio astronomy applications in the frequency range 900 MHz to…”
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L-Band Feed Horn and Orthogonal Mode Transducer for the KAT-7 Radio Telescope by Lehmensiek, R, Theron, I P

“…The design, simulation and measured performance of a broad bandwidth L-band wide flare angle corrugated conical horn and its orthogonal mode transducer are…”
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Integrated CAD procedure for iris design in a multi-mode waveguide environment by Steyn, W., Lehmensiek, R., Meyer, P.

“…A fast integrated CAD procedure for designing irises in multi-mode coupled cavity filters is presented. A reduced generalized scattering matrix (GSM), obtained…”
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MID-Radio Telescope, Single Pixel Feed Packages for the Square Kilometer Array: An Overview by Pellegrini, Alice, Flygare, Jonas, Theron, Isak P., Lehmensiek, Robert, Peens-Hough, Adriaan, Leech, Jamie, Jones, Michael E., Taylor, Angela C., Watkins, Robert E. J., Liu, Lei, Hector, Andre, Du, Biao, Wu, Yang

“…The Square Kilometre Array (SKA) project is an international effort to build the world's largest radio telescope, enabling science with unprecedented detail…”
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The Black Hole Explorer: Preliminary Antenna Design by Sridharan, T. K, Lehmensiek, R, Marrone, D, Cheimets, P, Freeman, M, Galison, P, Houston, J, Johnson, M, Silver, M

“…We present the basic design of a large, light weight, spaceborne antenna for the Black Hole Explorer (BHEX) space Very Long Baseline Interferometry…”
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The design of the MeerKAT L-band feed by Lehmensiek, R., Theron, I. P.

“…The design methodology of the MeerKAT L-band feed which consists of a wide flare angle axially corrugated conical horn, a horn matching section and a compact…”
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The synthesis and optimizationof a diplexer for the multi-purpose, multi-frequency shuttlecock antenna by Lehmensiek, R.

“…This paper describes the synthesis procedure and optimization algorithm developed to design a diplexer for the multi-purpose, multi-frequency Shuttlecock…”
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Adaptive sampling applied to multivariate, multiple output rational interpolation models with application to microwave circuits by Lehmensiek, Robert, Meyer, Petrie, Müller, Martinette

“…A fast and efficient adaptive sampling algorithm for multivariate, multiple output rational interpolation models is presented, which is based on convergents of…”
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Primary beam effects of radio astronomy antennas -- II. Modelling the MeerKAT L-band beam by Asad, K. M. B, Girard, J. N, de Villers, M, Ansah-Narh, T, Iheanetu, K, Smirnov, O, Santos, M. G, Lehmensiek, R, Jonas, J, de Villiers, D. I. L, Thorat, K, Hugo, B, Makhathini, S, Jozsa, G. I. G, Sirothia, S. K

“…After a decade of design and construction, South Africa's SKA-MID precursor MeerKAT has begun its science operations. To make full use of the widefield…”
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Towards an optics design for the SKA by Theron, I. P., Lehmensiek, R., de Villiers, Dirk I. L.

“…This paper describes the process to derive the SKA optics. The outcome of this process will be both the dish optics and optimised feeds (only the illuminating…”
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The MeerKAT Galaxy Cluster Legacy Survey I. Survey Overview and Highlights by Knowles, K, Cotton, W. D, Rudnick, L, Camilo, F, Goedhart, S, Deane, R, Brüggen, M, Button, C, Chen, H, Chibueze, J. O, Clarke, T. E, de Gasperin, F, Ianjamasimanana, R, Hilton, M, Kesebonye, K. C, Kolokythas, K, Kraan-Korteweg, R. C, Lawrie, G, Lochner, M, Marchegiani, P, Moodley, K, Murphy, E, Oozeer, N, Parekh, V, Pillay, D. S, Sikhosana, S. P, Smirnov, O, Thorat, K, Venturi, T, Abbott, T. D, Aldera, M. A, Bennett, T. G. H, Bode, W. A, Botha, A. G, Buchner, S, Burger, J. P, Cheetham, T, Dikgale-Mahlakoana, M. A, Esterhuyse, S. W. P, Fadana, G, Fanaroff, B. L, Fataar, S, Foley, A. R, Fourie, D. J, Frank, B. S, Gatsi, T. G, Geyer, M, Gouws, M, Hlakola, M. J, Hokwana, A, Hoosen, S. W, Horn, D. M, Horrell, J. M. G, Isaacson, A. R, Joubert, A. F, Kapp, F. B, Kasper, V. A, Kenyon, J. S, Kotzé, P. P. A, Kotze, A. G, Kriek, N, Krishnan, V. K, Kusel, T. W, Lehmensiek, R, Liebenberg, D, Lord, R. T, Lunsky, B. M, Magnus, L. G, Main, J. P. L, Makhathini, S, Malan, J. A, Manley, J. R, Marais, S. J, Martens, A, Mauch, T, Millenaar, R. P, Mokone, O. J, Monama, T. E, Mphego, M. C, New, W. S, Ngcebetsha, B, Ockards, M. T, Perkins, S. J, Ramanujam, N. M, Ramudzuli, Z. R, Ratcliffe, S. M, Renil, R, Robyntjies, A, Rust, A. N, Salie, S, Sambu, N, Slabber, M, Taljaard, B, Tasse, C, Tiplady, A. J, van Balla, T. J, van Dyk, C. L, Van Wyk, R, Venter, A. J, Williams, L. P

“…MeerKAT's large number of antennas, spanning 8 km with a densely packed 1 km core, create a powerful instrument for wide-area surveys, with high sensitivity…”
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