Frequency selective superstrate absorber for wideband RCS reduction of metal‐backed antennas

Abstract

The use of a resistively loaded frequency selective surface (FSS) superstrate is reported as a means to reduce the radar cross‐section (RCS) of metal‐backed antennas. The design methodology is demonstrated by creating a low‐profile absorber which exhibits a transmission window covering the working frequency band (10–10.2 GHz) of a 4 × 4 microstrip patch array. Placing the structure λ/2 above the radiating aperture is shown to reduce the antenna gain by less than 2 dB and have minimal impact on the shape of the beams which are directed at 0° and tilt angles of 22.5° and 45°. Moreover 90% radar backscatter suppression is achieved over 92% of the frequency range 8.85–24 GHz. The perforated metal‐backed FSS superstrate was inkjet printed on a 140 μm thick polyethylene terephthalate (PET) sheet and the conductivity of the silver plating adjusted to achieve the required 40 Ω/sq surface resistance. The experimental results obtained for the standalone microwave absorber, and when integrated with the antenna, are shown to be in close agreement with the computed reflectivity and far field patterns.

Sub‐array level structural compensation method for radiating and scattering performance of array antennas

“…The above sub-array level structural adjustments are substituted into (7) and (18) separately to calculate the scattering and radiating performance of the array antenna, and the results are shown in Figures 9-10 and Table 1.…”

“…When the position of the antenna element shifts, the radiating performance of the antenna could be degraded but the scattering performance could also be improved, that is, antenna's radiating and scattering performance are a pair of contradictory indicators. With the rapid development of electronic warfare, the radiating and stealth performance of APAA have both become increasingly important [7]. Therefore, there is an urgent need to balance the performance of the radiating and scattering for the distorted array antennas in service.…”