A microstrip antenna with reduced in-band and out-of-band radar cross-section

Abstract

This paper proposes a microstrip antenna with reduced in-band and out-of-band radar cross-section (RCS) by subtracting the area of weak scattered current on the ground plane. Fourteen square slots were subtracted from the ground plane, reducing in-band and out-of-band RCS while maintaining radiation performance. Modified and reference antenna surface current distributions were simulated and analyzed in radiating and scattering modes. Two antenna prototypes were fabricated and measured to verify the simulation. The proposed antenna RCS was reduced compared with the reference antenna in the frequency range 1–4.4 GHz, including in-band and out-of-band frequency bands. Maximum in-band and out-of-band RCS reduction was 16.3 dBsm at the working frequency, and 19.3 dBsm at 3.4 GHz, respectively

A Low-Scattering Antenna Array at Both Normal and Grazing Incidence

“…On this basis, an UWB antenna with an improved shape is designed in [15], and the bandwidth of the 10 dB RCS reduction is further broadened. In [16], a microstrip antenna with reduced in-band and out-of-band RCS is presented; partial areas of the patch and ground are subtracted to achieve the low-scattering performance. In sum up, although different shapes of single antennas in [14][15][16] can all achieve RCS reduction, the arrays are more widely in use in the stealth platforms owing to the properties of high gain and high directivity [17][18][19][20].…”

In-band RCS reduction antennas using an EBG surface

“…A phased array antenna based on the switchable-stacked artificial structure is proposed in [15] to obtain broadband RCSR and wide scanning range. Both in-band and out-of-band RCSR techniques were proposed in [16] by replacing the weak current distribution ground plane region with 14 square slots.…”