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2014

A Resistive Wideband Space Beam Splitter

Mahesh, Nivedita, Subrahmanyan, Ravi, Shankar, N. Udaya et al.

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We present the design, construction and measurements of the electromagnetic performance of a wideband space beam splitter.

The beam splitter is designed to power divide the incident radiation into reflected and transmitted components for interferometer measurement of spectral features in the mean cosmic radio background.
Analysis of a 2-element interferometer configuration with a vertical beam splitter between a pair of antennas leads to the requirement that the beam splitter be a resistive sheet with sheet resistance {\eta}o /2, where {\eta}o is the impedance of free space.
The transmission and reflection properties of such a sheet is computed for normal and oblique incidences and for orthogonal polarizations of the incident electric field.

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Pritchard J. R., Loeb A., Evolution of the 21 cm signal throughout cosmic history , PRD, 78(10):103511, November 2008
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R. A. Sunyaev and J. Chluba Signals from the epoch of cosmological recombination. Astron. Nachr. / AN 330, No. 7, pp.657 - 674, 2009
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Bowman, Judd D.; Rogers, Alan E. E. A lower limit of Δ z > 0.06 \Delta z>0.06 for the duration of the reionization epoch. Nature, Volume 468, Issue 7325, pp. 796-798, 2010
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Chandrika S, Vibhor Mahule, ACR Pillai, Atanu Mohanty, A Novel Space Cloth Using Resistor Grid Network for Radar Absorbers in Sleath Applications , International conference on Communications and Signal Processing (ICCSP), pp.83-86, 2011
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Burns, Jack O.; Lazio, J.; Bale, S.; Bowman, J.; Bradley, R.; Carilli, C.; Furlanetto, S.; Harker, G.; Loeb, A.; Pritchard, J. Probing the first stars and black holes in the early Universe with the Dark Ages Radio Explorer (DARE). Advances in Space Research, Volume 49, Issue 3, p. 433-450, 2012
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