Abstract
In this study, a frequency-selective radome in the millimeter-wave band with excellent incident-angle stability is designed. The hybrid structure comprising the designed radome combines a multilayered composite material, which has a rectangular loop-type FSS (frequency selective surface) structure with frequency-selective transmission characteristics in the millimeter-wave band. It has a low transmission loss of ≤1 dB in the pass band and a high blocking characteristic of ≥10 dB in the X-band for polarization TE (transverse electric). Additionally, the TM (transverse magnetic) modes and incidence angles ranged from 0° to 50°. To confirm the design performance, a hybrid composite structure is fabricated and the transmission characteristics in the millimeter-wave band and X-band are measured using free-space measurement. The results confirm that the normal incident wave has a passband center frequency and stopband center frequency of 0.62 and 13.45 dB, respectively.
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