Abstract:
This work focused on the novel and compact 1-bit symmetrical coding-based metama-
terial for radar cross section reduction in terahertz frequencies. A couple of coding particles were
constructed to impersonate the elements ‘0′ and ‘1′, which have phase differences of 180◦. All the
analytical simulations were performed by adopting Computer Simulation Technology Microwave
Studio 2019 software. Moreover, the transmission coefficient of the element ‘1′ was examined as well
by adopting similar software and validated by a high-frequency structure simulator. Meanwhile,
the frequency range from 0 to 3 THz was set in this work. The phase response properties of each
element were examined before constructing various coding metamaterial designs in smaller and
bigger lattices. The proposed unit cells exhibit phase responses at 0.84 THz and 1.54 THz, respectively.
Meanwhile, the analysis of various coding sequences was carried out and they manifest interesting
monostatic and bistatic radar cross section (RCS) reduction performances. The Coding Sequence 2
manifests the best bistatic RCS reduction values in smaller lattices, which reduced from −69.8 dBm2
to −65.5 dBm2 at 1.54 THz. On the other hand, the monostatic RCS values for all lattices have an
inclined line until they reach a frequency of 1.0 THz from more than −60 dBm2. However, from
the 1.0 THz to 3.0 THz frequency range the RCS values have moderate discrepancies among the
horizontal line for each lattice. Furthermore, two parametric studies were performed to examine
the RCS reduction behaviour, for instance, multi-layer structures and as well tilt positioning of the
proposed coding metamaterial. Overall it indicates that the integration of coding-based metamaterial
successfully reduced the RCS values.
