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IEEE Transactions on Antennas and Propagation
Volume 48 Number 1, January 2000

Table of Contents for this issue

Complete paper in PDF format

Dual-Band Dual-Polarized Perforated Microstrip Antennas for SAR Applications

Lotfollah L. Shafai , Fellow, IEEE Walid A. Chamma, Mohamed Barakat, Peter C. Strickland and Guy Séguin

Page 58.

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.

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