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PIER PIER B PIER C PIER M PIER Letters
2012-03-21
A Frequency Selective Absorbing Ground Plane for Low-RCS Microstrip Antenna Arrays
By
Filippo Costa,

    Dr. Filippo Costa

    Department of Information Engineering

    University of Pisa

    Italy

    Homepage

Simone Genovesi,

    Dr. Simone Genovesi

    Dipartimento di Ingegneria dell' Informazione

    Università di Pisa

    Italy

    Homepage

Agostino Monorchio

    Dr. Agostino Monorchio

    Dept Informat Engn

    Univ Pisa

    Italy

    Homepage

Progress In Electromagnetics Research, Vol. 126, 317-332, 2012
doi:10.2528/PIER12012904
Abstract
An efficient strategy for reducing the signature of an antenna is to substitute the conventional solid ground plane with a patterned ground plane thus letting the incoming energy to pass through the structure except over the operating band of the antenna. However, in a real environment, the energy flowing through the FSS (Frequency Selective Surface) can be intercepted by eventual scatterers located behind the antenna, so to nullify the RCS (Radar Cross Section) reduction. To overcome this drawback, a novel composite structure is proposed which is able to dissipate such energy by placing a thin absorbing layer below the FSS ground. It is shown that a careful analysis has to be performed to accomplish this goal since the transparent antenna array and the backing absorber strongly interact and thus they cannot be separately designed. The optimal value of the foam spacer thickness between the FSS ground and the absorbing layer is investigated by an efficient equivalent transmission line approach. Criteria for enlarging the low-RCS band with respect to the free space design are also provided. An antenna array prototype backed by the thin multilayer structure is finally manufactured and tested.
Citation
Filippo Costa, Simone Genovesi, and Agostino Monorchio, "A Frequency Selective Absorbing Ground Plane for Low-RCS Microstrip Antenna Arrays," Progress In Electromagnetics Research, Vol. 126, 317-332, 2012.
doi:10.2528/PIER12012904
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