Abstract: An antenna platter comprises a plurality of antenna elements arranged as a thin array according to a polygonal grid. The polygonal grid comprises a plurality of paired polygons arranged symmetrically about a central polygon of the grid. In each polygon of the grid, the plurality of antenna elements is arranged in symmetrical pairs about a center point such that the first and second antenna elements of each symmetrical pair are complex conjugates of one another.

Abstract: An antenna platter comprises a plurality of antenna elements arranged as a thin array according to a polygonal grid. The polygonal grid comprises a plurality of paired polygons arranged symmetrically about a central polygon of the grid. In each polygon of the grid, the plurality of antenna elements is arranged in symmetrical pairs about a center point such that the first and second antenna elements of each symmetrical pair are complex conjugates of one another.

Abstract: A frequency discriminator circuit that includes a signal shaping and power splitting circuit (20) responsive to a sinusoidal RF input signal for providing first and second substantially identical squarewave outputs having the same frequency as the sinusoidal RF signal, a digital delay line (19) responsive to the first squarewave output for providing a delayed replica of the first squarewave output, an exclusive OR gate (21) responsive to the second squarewave output and the delayed replica of the first squarewave output, low pass filters (23, 25) for averaging each of the inverted and non-inverted outputs of the exclusive OR gate, and a differential amplifier (27) for subtracting the outputs of the low pass filters from each other and providing an output indicative of the frequency of the RF input signal.