Abstract-State-of-the-art radomes exploit frequency selective media so as to be transparent for the frequencies of the antenna protected by them and opaque to other frequencies. This feature helps in reducing the radar cross section of the antenna and in protecting it from interference. The study of a frequency selective radome is a daunting task, since the radome is usually large in terms of wavelengths, hence full wave analyses are prohibitive. In this paper an approximate technique, based on the physical optics concept, is proposed to attain an estimation of the behavior of a radome shielded antenna in a short time with a commonly available computer. Results are validated against a full wave technique over a relatively small radome.
A recently developed material based on carbon nanotubes is used here for the realization of single-and double-layered frequency-selective surfaces (FSSs) with relevant absorbing properties. The peculiar characteristics of carbon nanotubes are exploited to devise high-loss resonant ring structures periodically arranged to build the FSS. By introducing two layers of rings, an absorber with stable characteristics over a wide frequency band and over a wide range for the incident wave angle is achieved.
The fulfilment of Hit To Kill performance in air defence scenarios against highly manoeuvring targets can be obtained by using a millimeter wavelength Seeker with a dedicated "hit to kill" guidance. The use of a phased array configuration allows to have the benefits of the electronic scanning. The features of this technology permits to counteract complex threats. So it could be an interesting choice for the systems that have to meet asymmetric threats (aircraft, cruise missiles, TBM, …).The main topics are:
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