Abstract: An apparatus and method for active noise cancellation, including but not limited to, noise cancellation at VLF frequencies. The invention facilitates the reception of critical information in variable and extreme EMI scenario with no information about the signal of interest. The invention utilizes an automated, signal agnostic active noise cancellation technique and associated hardware components. In order to extract the signal of interest, vector modulation is employed to the signal from the noise only antenna so as to match it and then subtract it from the received signal containing combined noise and signal of interest. This apparatus and method ensures that a signal of interest can be extracted from an extremely noisy environment without any knowledge about the characteristics of that signal.

Abstract: Ultra-broadband thin planar antenna has a flat elliptical element and a spaced rectangular element co-planar with the elliptical element. The inner conductor of a coaxial cable connects to the elliptical element near a gap between the elements and the outer conductor of the coaxial cable connects to the rectangular element. A housing encases the elliptical and rectangular elements and the transmission line. The antenna functions electrically as an asymmetrical planar dipole having a special configuration or as an elliptical planar monopole with a co-planar finite rectangular ground plane.

Abstract: A low cross-polarization microstrip patch array antenna includes a microstrip patch array, an antenna substrate, a ground plane and a polarizer. The polarizer mounts over the array and includes a low dielectric spacer, a thin polarizer substrate mounted on the spacer and a plurality of uniformly spaced, thin, conductive strips on the polarizer substrate. The strips extend perpendicular to the direction of desired radiation and parallel to the direction of undesired radiation.

Abstract: Ultra-broadband thin planar antenna has a flat elliptical element and a spaced rectangular element co-planar with the elliptical element. The inner conductor of a coaxial cable connects to the elliptical element near a gap between the elements and the outer conductor of the coaxial cable connects to the rectangular element. A housing encases the elliptical and rectangular elements and the transmission line. The antenna functions electrically as an asymmetrical planar dipole having a special configuration or as an elliptical planar monopole with a co-planar finite rectangular ground plane.

Abstract: A microstrip array antenna has rows of radiating elements with the rows phase shifted according to a phase distribution. The distribution is anti-symmetrical and generally linear in magnitude over most of the array length, decreasing back to zero as the array edges are approached. The top and bottom rows are not phase shifted. The rows are phase shifted by lengthening the connecting lines to the radiating elements. Shifting the phase of the rows according to the phase distribution reduces only the lower, ground directed sidelobes of the antenna radiation pattern.