Abstract
A low radar cross-section (RCS) wideband circularly-polarized (CP) dipole antenna using a frequency selective surface (FSS) is presented in this paper. A planar dipole antenna consists of a pair of slotted patches fabricated on top and bottom sides of the substrate is designed. The slotted patches are connected through a circular ring, which acts as a delay line to achieve circular polarization. In the proposed configuration, a band-stop FSS is employed for the antenna reflector, which improves the radiation performance and reduces the RCS of the dipole antenna. The impedance bandwidth (S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> ≤−10 dB) of the proposed antenna is 0.95 to 3.1 GHz and 3-dB axial ratio bandwidth (ARBW) is 1.9 to 2.35 GHz. The proposed antenna shows the maximum and average RCS reduction of 20 dB and 6.9 dB, respectively, in the frequency range of 3.7 to 18 GHz. The simulated and measured results show that the maximum gain of the antenna increases by 5.9 dB by using FSS.
Highlights
For defense applications, there is a huge demand for wideband circularly-polarized (CP), high gain, and low radar cross section (RCS) antennas
The measured impedance bandwidth of the antenna (S11 less than −10 dB) is 0.9 to 3.2 GHz, which is slightly larger than the simulated result due to fabrication error and assembly tolerances
It can be concluded that the proposed antenna achieves wider bandwidth, higher gain, and significant RCS reduction bandwidth with a lower profile as compared with the works discussed in the literature
Summary
There is a huge demand for wideband circularly-polarized (CP), high gain, and low radar cross section (RCS) antennas.
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