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http://hdl.handle.net/2289/6418
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DC Field | Value | Language |
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dc.contributor.author | Mahesh, Nivedita | - |
dc.contributor.author | Subrahmanyan, Ravi | - |
dc.contributor.author | Udaya Shankar, N. | - |
dc.contributor.author | Raghunathan, A. | - |
dc.date.accessioned | 2016-10-03T06:30:03Z | - |
dc.date.available | 2016-10-03T06:30:03Z | - |
dc.date.issued | 2015-11 | - |
dc.identifier.citation | IEEE Transactions on antennas and propagation, 2015, Vo. 63, p4835 | en_US |
dc.identifier.issn | 0018-926X | - |
dc.identifier.issn | 1558-2221 (Online) | - |
dc.identifier.uri | http://hdl.handle.net/2289/6418 | - |
dc.description | Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations) | en_US |
dc.description.abstract | We present the design, construction, and measurements of the electromagnetic performance of a wideband space beam splitter. The beam splitter is a sheet in free space that is designed to divide incident radiation into reflected and transmitted components for interferometer measurement of spectral features in the mean cosmic radio background. Analysis of a two-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 ηo/2, where ηo is the impedance of free space. The transmission and reflection properties of such a sheet are computed for normal and oblique incidences and for orthogonal polarizations of the incident electric field. We have constructed such an electromagnetic beam splitter as a square-soldered grid of resistors of value 180 Ohms (approximately ηo/2) and a grid size of 0.1 m. We measured the reflection and transmission coefficients over a wide frequency range between 50 and 250 MHz in which the wavelength well exceeds the mesh size. Measurements of the coefficients for voltage transmission and reflection agree to within 5% with physical optics modeling of the wave propagation, which takes into account edge diffraction.i | en_US |
dc.language.iso | en | en_US |
dc.publisher | IEEE | en_US |
dc.relation.uri | http://adsabs.harvard.edu/abs/2015ITAP...63.4835M | en_US |
dc.relation.uri | http://arxiv.org/abs/1406.2585 | en_US |
dc.relation.uri | http://dx.doi.org/10.1109/TAP.2015.2478443 | en_US |
dc.rights | 2013 IEEE | en_US |
dc.subject | Radio interferometry | en_US |
dc.subject | Mathematical model, | en_US |
dc.subject | Antenna measurements | en_US |
dc.title | A Wideband Resistive Beam-Splitter screen | en_US |
dc.type | Article | en_US |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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2015_IEEETrasAnt&Prop_63_4835.pdf Restricted Access | Restricted Access | 1.31 MB | Adobe PDF | View/Open Request a copy |
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