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This work presents the design of a low-profile array of printed dipoles with inherent filtering properties for radar applications. The antenna and the band-pass filter are integrated in a single module, which is small enough to fit within the array unit cell (with period of about 0.4 ? at the highest operational frequency). The array element may be viewed as a three-pole Tchebychev filter in which the load resistance and the first resonator are implemented by means of the radiating dipole and the backing reflector. Results obtained via infinite array simulations are presented. A 23% relative bandwidth (S11 < -10 dB) is achieved for broadside radiation and for scanning up to 45 on the H-plane.

This letter deals with a study of aperiodically ordered textured (mushroom-type) high-impedance surfaces (HISs), and their possible application as artificial-magnetic-conductor groundplanes for low-profile directive antennas. In this framework, results from full-wave simulations are presented in order to characterize the electromagnetic response (in terms of impedance matching, directivity, and surface-wave suppression) of selected configurations based on representative categories of aperiodic tilings, and compare them with those of standard periodic HISs. © 2008 IEEE.