Abstract
A conformal load-bearing antenna structure (CLAS) combines the antenna into acomposite structure such that it can carry the designed load while functioning asan antenna. In this paper, two types of new 3D integrated microstrip antennas(3DIMAs) with different feeding methods are designed to work at the radarL-band. Different from the conventional CLAS, the radiating patch and theground plane of the 3DIMA are both composed of woven conductive wires andare bonded into the 3D composite physically by Z-yarns, greatly improving thedamage tolerance of the antenna. The return loss of the coaxial-fed antenna is−13.15 dB with a resonant frequency of 1.872 GHz, while that of the microstrip-fed antenna is−31.50 dB with a resonant frequency of 1.33 GHz. Both of the 3DIMAs have similar radiationpatterns to that of the traditionally designed microstrip antenna. In addition, anexperimental investigation of the impact response of the coaxial-fed 3DIMA was carried outand the results showed the radiation pattern had almost no change even when the antennareceived an impact energy of 15 J, exhibiting superior impact resistance to that of aconventional microstrip antenna.
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