Zobrazeno 1 - 10
of 18
pro vyhledávání: '"R.A. Hoferer"'
Autor:
R.A. Hoferer, Yahya Rahmat-Samii
Publikováno v:
IEEE Transactions on Antennas and Propagation. 50:1676-1687
Technological demands have brought a renewed interest in the application of large reflector antennas with steadily increasing operating frequencies and antenna dimensions. The high surface accuracy of the main reflector required by these antennas can
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f750a786bff570896b7e28da84499a0b
https://doi.org/10.1109/tap.2002.807375
https://doi.org/10.1109/tap.2002.807375
Autor:
R.A. Hoferer, Yahya Rahmat-Samii
Publikováno v:
IEEE Transactions on Antennas and Propagation. 46:1449-1457
Space-borne satellite applications provide a vast array of services extending from global connectivity to Earth observation systems. The soil moisture radiation mission is a proposed space-borne passive microwave system complementary to the existing
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::74065b0ec93771daf44823e9e93ae44c
https://doi.org/10.1109/8.725276
https://doi.org/10.1109/8.725276
Publikováno v:
IEEE Antennas and Propagation Magazine. 40:82-87
Beam efficiency has proven to be an important measure for characterizing the performance of reflector antennas. In this paper, a simple formula is presented to allow for a quick estimate of the beam efficiency of reflector antennas. This estimate inc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d86928847c582b92e687e1d2c687e95a
https://doi.org/10.1109/74.735967
https://doi.org/10.1109/74.735967
Publikováno v:
Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation.
This paper addresses the design and analysis of a 8.5m dual-offset reflector antenna for S-Band weather RADAR applications, we well as feed and antenna test results showing compliance to very stringent beam symmetry, cross-polarization, and power han
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c464c0053bfcdacf47b2432cade251a2
https://doi.org/10.1109/aps.2012.6349017
https://doi.org/10.1109/aps.2012.6349017
Publikováno v:
Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation.
This paper describes the feed upgrade effort to an existing 9m dual-offset reflector antenna operating at S-band for weather radar applications. The new feed, designed to upgrade the existing operational capabilities, fits mechanically in the existin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5e7769b12d3089992223516aa120fd7e
https://doi.org/10.1109/aps.2012.6349005
https://doi.org/10.1109/aps.2012.6349005
Autor:
R.A. Hoferer, R. Schwerdtfeger
Publikováno v:
IEEE Antennas and Propagation Society International Symposium (IEEE Cat. No.02CH37313).
In satellite communications, single frequency band systems with narrow bandwidth have gradually evolved into multi-band antenna systems with ever increasing bandwidth. Additional characteristics for earth stations are dual polarization, CP/LP switchi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::095c3710b633a15a6b283d0540f5c60c
https://doi.org/10.1109/aps.2002.1016939
https://doi.org/10.1109/aps.2002.1016939
Autor:
Y. Rahmat-Samii, R.A. Hoferer
Publikováno v:
IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010).
In this paper, the implementation of a Fourier-Jacobi surface expansion into a geometrical optics/physical optics (GO/PO) reflector analysis is discussed and some unique features of this implementation are detailed. The radiation characteristics, suc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0d2bd8db2c9fc363586ba349e9c934bf
https://doi.org/10.1109/aps.1999.789276
https://doi.org/10.1109/aps.1999.789276
Autor:
Y. Rahmat-Samil, R.A. Hoferer
Publikováno v:
IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010).
The ARISE (Advanced Radio Interferometry between Space and Earth) program, part of future scientific and communications missions, are designed to test the concept of using very large reflector antennas in space. The antenna dimensions are targeted fr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::566a38978a0680b428ee4e1fd7ab97b6
https://doi.org/10.1109/aps.1999.788232
https://doi.org/10.1109/aps.1999.788232
Autor:
R.A. Hoferer, Y. Rahmat-Samii
Publikováno v:
IEEE Antennas and Propagation Society International Symposium 1997. Digest.
The Inflatable Radiometer Imaging System (IRIS) is a space-borne passive microwave system complementary to the existing Earth Observing System. It is designed to provide global measurements of land-surface soil moisture, surface temperature, vegetati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1a9ee7c68dfdf35a948a34392c7fece9
https://doi.org/10.1109/aps.1997.631595
https://doi.org/10.1109/aps.1997.631595
Autor:
Y. Rahmat-Samii, R.A. Hoferer
Publikováno v:
1999 IEEE Aerospace Conference. Proceedings (Cat. No.99TH8403).
There are many scientific and observational missions that necessitate the application of space-borne satellites with large antennas. The soil moisture radiation mission is a recently proposed space-borne passive microwave system complementary to the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::976a05126f9862be28d2cba1e01f3cd7
https://doi.org/10.1109/aero.1999.789784
https://doi.org/10.1109/aero.1999.789784