Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6418
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dc.contributor.authorMahesh, Nivedita-
dc.contributor.authorSubrahmanyan, Ravi-
dc.contributor.authorUdaya Shankar, N.-
dc.contributor.authorRaghunathan, A.-
dc.date.accessioned2016-10-03T06:30:03Z-
dc.date.available2016-10-03T06:30:03Z-
dc.date.issued2015-11-
dc.identifier.citationIEEE Transactions on antennas and propagation, 2015, Vo. 63, p4835en_US
dc.identifier.issn0018-926X-
dc.identifier.issn1558-2221 (Online)-
dc.identifier.urihttp://hdl.handle.net/2289/6418-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en_US
dc.description.abstractWe 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.ien_US
dc.language.isoenen_US
dc.publisherIEEEen_US
dc.relation.urihttp://adsabs.harvard.edu/abs/2015ITAP...63.4835Men_US
dc.relation.urihttp://arxiv.org/abs/1406.2585en_US
dc.relation.urihttp://dx.doi.org/10.1109/TAP.2015.2478443en_US
dc.rights2013 IEEEen_US
dc.subjectRadio interferometryen_US
dc.subjectMathematical model,en_US
dc.subjectAntenna measurementsen_US
dc.titleA Wideband Resistive Beam-Splitter screenen_US
dc.typeArticleen_US
Appears in Collections:Research Papers (A&A)

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