VHF Wide-Band, Dual-Polarization Microstrip-Patch Antenna
The figure depicts selected aspects of a very-high-frequency (VHF) microstrip patch antenna designed and built to satisfy requirements specific to an airborne synthetic-aperture radar system for measuring the thickness of sea ice. One of the requirements is that the antenna be capable of functioning...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20080048002 2023-05-15T18:18:30+02:00 VHF Wide-Band, Dual-Polarization Microstrip-Patch Antenna Huang, John Unclassified, Unlimited, Publicly available October 2008 application/pdf http://hdl.handle.net/2060/20080048002 unknown Document ID: 20080048002 http://hdl.handle.net/2060/20080048002 Copyright, Distribution as joint owner in the copyright CASI Communications and Radar NPO-41502 NASA Tech Briefs, October 2008; 9-10 2008 ftnasantrs 2019-07-21T06:40:19Z The figure depicts selected aspects of a very-high-frequency (VHF) microstrip patch antenna designed and built to satisfy requirements specific to an airborne synthetic-aperture radar system for measuring the thickness of sea ice. One of the requirements is that the antenna be capable of functioning over the relatively wide frequency band of 127 to 172 MHz corresponding to a fractional bandwidth of about 30 percent relative to a nominal mid-band frequency of 149.5 MHz. Another requirement is that the antenna be capable of functioning in either or both of two orthogonal linear polarizations. In addition, the antenna is required to be as compact and lightweight as possible. In a basic design according to generally accepted microstrip-patch-antenna engineering practice, one would ordinarily use a relatively thick dielectric substrate and multiple feed probes to obtain the desired combination of wide-band and dual-polarization capabilities. However, the combination of a thick substrate and multiple feeds would give rise to higher-order electromagnetic nodes, thereby undesirably contributing to cross polarization and to reduction of the isolation between feed probes. To counter these adverse effects while satisfying the requirements stated above, the design of this antenna incorporates several improvements over the basic design. Other/Unknown Material Sea ice NASA Technical Reports Server (NTRS) |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Communications and Radar |
spellingShingle |
Communications and Radar Huang, John VHF Wide-Band, Dual-Polarization Microstrip-Patch Antenna |
topic_facet |
Communications and Radar |
description |
The figure depicts selected aspects of a very-high-frequency (VHF) microstrip patch antenna designed and built to satisfy requirements specific to an airborne synthetic-aperture radar system for measuring the thickness of sea ice. One of the requirements is that the antenna be capable of functioning over the relatively wide frequency band of 127 to 172 MHz corresponding to a fractional bandwidth of about 30 percent relative to a nominal mid-band frequency of 149.5 MHz. Another requirement is that the antenna be capable of functioning in either or both of two orthogonal linear polarizations. In addition, the antenna is required to be as compact and lightweight as possible. In a basic design according to generally accepted microstrip-patch-antenna engineering practice, one would ordinarily use a relatively thick dielectric substrate and multiple feed probes to obtain the desired combination of wide-band and dual-polarization capabilities. However, the combination of a thick substrate and multiple feeds would give rise to higher-order electromagnetic nodes, thereby undesirably contributing to cross polarization and to reduction of the isolation between feed probes. To counter these adverse effects while satisfying the requirements stated above, the design of this antenna incorporates several improvements over the basic design. |
format |
Other/Unknown Material |
author |
Huang, John |
author_facet |
Huang, John |
author_sort |
Huang, John |
title |
VHF Wide-Band, Dual-Polarization Microstrip-Patch Antenna |
title_short |
VHF Wide-Band, Dual-Polarization Microstrip-Patch Antenna |
title_full |
VHF Wide-Band, Dual-Polarization Microstrip-Patch Antenna |
title_fullStr |
VHF Wide-Band, Dual-Polarization Microstrip-Patch Antenna |
title_full_unstemmed |
VHF Wide-Band, Dual-Polarization Microstrip-Patch Antenna |
title_sort |
vhf wide-band, dual-polarization microstrip-patch antenna |
publishDate |
2008 |
url |
http://hdl.handle.net/2060/20080048002 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
CASI |
op_relation |
Document ID: 20080048002 http://hdl.handle.net/2060/20080048002 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766195091546832896 |