Communications: radio wave antennas – Antennas – Microstrip
Patent
1994-09-09
1995-06-06
Hajec, Donald
Communications: radio wave antennas
Antennas
Microstrip
H01Q 138
Patent
active
054226490
ABSTRACT:
A microstrip array antenna for vertically polarized fan beam (approximately 2.degree..times.50.degree.) for C-band SAR applications with a physical area of 1.7 m by 0.17 m comprises two rows of patch elements and employs a parallel feed to left- and right-half sections of the rows. Each section is divided into two segments that are fed in parallel with the elements in each segment fed in series through matched transmission lines for high efficiency. The inboard section has half the number of patch elements of the outboard section, and the outboard sections, which have tapered distribution with identical transmission line sections, terminated with half wavelength long open-circuit stubs so that the remaining energy is reflected and radiated in phase. The elements of the two inboard segments of the two left- and right-half sections are provided with tapered transmission lines from element to element for uniform power distribution over the central third of the entire array antenna. The two rows of array elements are excited at opposite patch feed locations with opposite (180.degree. difference) phases for reduced cross-polarization.
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John Huang, Dual-Polarized Microstrip Array with High Isolation and Low Cross-Polarization, Microwave & Optical Technology Letters, vol.4, No. 3, Feb. 1991, pp. 99-103.
Hajec Donald
Jones Thomas H.
Kusmiss John H.
Miller Guy M.
The United States of America as represented by the Administrator
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