Notched/diagonally fed twin electric microstrip dipole antennas

Claim 1

A notched/diagonally fed twin electric microstrip antenna, comprising: a. a dielectric substrate; b. a twin pair of thin rectangular radiating elements disposed one each on opposite sides of said dielectric substrate which electrically separates the twin radiating elements; c. the radiating element on one side of said dielectric substrate being directly opposite to and the mirror image of the radiating element on the other side of said dielectric substrate; d. each of said twin radiating elements being operable to be excited to radiate in a microstrip mode, and each of said twin radiating elements acting as a ground plane for the other; e. the broadside fields of each of the twin radiating elements being excited in identical modes of oscillation, radiating independently of each other with respective fields on opposite sides of the dielectric substrate being 180 degrees out of phase with one another; f. said twin radiating elements each having a single feed point located along a diagonal line of the radiating elements between the outer edge and the center point thereof; said feed points being directly opposite to each other; g. said twin radiating elements each having a notch extending into said radiating element from the outer edge thereof along said diagonal line to said feed point; h. the resonant frequency of the antenna being determined primarily by the length of said radiating elements the width of the notch having a slight effect on the resonant frequency, as the notch width is increased the resonant frequency being increased slightly, and vice versa; i. the antenna input impedances being variable to match most practical impedances as said feed points are moved along said diagonal line; j. the antenna bandwidth being variable with the width of the radiating elements and the spacing between said twin radiating elements, the spacing between the twin radiating elements having somewhat greater effect on the bandwidth than the radiating element width; k. said radiating elements each being operable to oscillate in two modes of current oscillation, said two modes being orthogonal to one another; l. antenna polarization being linear when the radiating elements length and width are equal, the antenna polarization being circular when the phase difference between the two modes of oscillation are in quadrature due to differences between the length and width of the radiating elements.