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    Dual-band dual-polarized perforated microstrip antennas for SAR applications

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    Shafai_Dual_band_dual_polarized.pdf (355.9Kb)
    Date
    2000-01-31
    Author
    Shafai, LL
    Chamma, WA
    Barakat, M
    Strickland, PC
    Seguin, G
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    Abstract
    For dual-band dual-polarized synthetic aperture radar (SAR) applications a compact low-profile design is investigated. The operating frequencies are at the L and C-bands, centered about 1.275 and 5.3 GHz, respectively. Since the C-band frequency is larger by a factor of four, its array elements and interelement separations are smaller by the same ratio. Thus, to allow similar scan ranges for both bands, the L-band elements are selected as perforated patches to enable the placement of C-band elements within them. Stacked-patch configurations were used to meet the bandwidth requirements, especially in the L-band, The C-band element was designed numerically, but the perforated L-band one required final experimental optimization. Also, in the latter case of L-band, balanced transmission line feed was used to minimize cross polarization. For the C-band elements, slot coupling was used and, to simplify the feed, symmetric parasitic slots were incorporated to minimize cross polarization. No vertical connections were utilized, and electromagnetic couplings resulted in a compact low-profile design, with an electrically and thermally symmetric geometry.
    URI
    http://hdl.handle.net/1993/2849
    DOI
    10.1109/8.827386
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