Miniaturized Frequency Selective Radome Operating in the X-Band with Wideband Absorption
Keywords:
Bandpass FSS, Frequency Selective Surface (FSS), radome, resistive FSS, wideband absorptionAbstract
In this work, a miniaturized frequency selective radome with wideband absorption is presented. The proposed design consists of a bandpass FSS and a resistive FSS. Both FSS’s are combined together through a foam spacer. A slotted miniaturized form of the conventional Jerusalem cross structure is employed as the bandpass FSS. A meandered form of the basic square loop with lumped resistors incorporated in each side of the loop is used as the resistive FSS. The bandpass FSS ensures the transmission in the X-band, which is the operating band of the radome. The resistive FSS absorbs the out-of-band signals and thus reduces RCS at higher frequencies. The proposed design operates in the frequency range of 8.88-10.85 GHz and absorbs between 18.8-28.35 GHz. The insertion loss at the center frequency of the operating band is 0.82 dB. The thickness of the entire structure is 0.07 λₒ with respect to center frequency (10 GHz) of the operating band. The overall size of a unit cell of the miniaturized design is 0.2 λₒ that ensure angular stability for different polarizations and incident angles.
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