Dual slot microstrip antenna device

Abstract

A dual slot antenna assembly is disclosed herein and generally includes a pair of concentrically positioned and radially spaced cylindrical conductors defining a pair of circumferential slots which are longitudinally spaced one-half wavelength apart at the anticipated operating frequency of the antenna device. An electrical signal feed assembly is connected with the conductors for exciting the slots so as to provide overlapping radiation patterns emanating in the same direction.

What is claimed is: 
     
       1. A dual slot antenna assembly comprising: a pair of laterally spaced-apart conductive elements electrically isolated with respect to one another, said conductive elements defining a pair of radiation slots longitudinally spaced-apart a predetermined distance approximately equal to one-half wavelength at the anticipated operating frequency of said assembly, each of which slots emanates radiation therefrom such that the radiation patterns developed are in substantially the same direction, said slots being of greater length than the spacing between said conductive elements; and electrical signal feed means connected with said conductors for electrically exciting both of said slots, said electrical signal feed means including a plurality of leads connected to an edge of one of said conductive elements adjacent one of said slots and spaced-apart at intervals at least substantially equal to one wavelength at said anticipated operating frequency. 
     
     
       2. An assembly according to claim 1 including nonconductive means for supporting said laterally spaced-apart conductive elements, said conductive elements and nonconductive means each comprising part of a single sheet of dielectric material metallically cladded on opposite sides thereof. 
     
     
       3. A dual slot antenna assembly comprising: a first substantially cylindrical conductor, the axial length of which is approximately equal to one-half wavelength at the anticipated operating frequency of said assembly; a second substantially cylindrical conductor, the axial length of which is at least equal to the axial length of said first conductor, said second conductor being positioned concentrically within and radially spaced from said first conductor and electrically isolated with respect thereto so as to define a pair of circumferential slots spaced one-half wavelength apart at said anticipated operating frequency and providing independent radiation patterns emanating in the same direction; and electrical signal feed means connected with said conductor for electrically exciting both of said slots, said electrical signal feed means including a plurality of leads connected to an edge of said first conductor adjacent one of said slots and circumferentially spaced-apart at intervals at least substantially equal to one wavelength at said anticipated operating frequency. 
     
     
       4. An assembly according to claim 3 including nonconductive means for supporting said first and second conductors, said conductors and nonconductive means each comprising part of a single sheet of dielectric material metallically cladded on opposite sides thereof. .Iadd. 5. A dual slot antenna assembly comprising: a pair of laterally spaced-apart conductive elements separated with respect to one another by a sheet of dielectric material,   one of said conductive elements being of larger dimensions and underlying the other element and defining an electrical reference or ground surface;   said conductive elements defining a pair of radiation slots between opposing edges of said other element and said reference surface, said radiation slots being longitudinally spaced-apart a predetermined distance approximately equal to one-half wavelength at the anticipated operating frequency of said assembly,   each of which radiation slots emanates radiation therefrom such that the radiation patterns developed are in substantially the same direction;   said radiation slots having a length dimension equal to the entire length of said opposing edges, which length dimension is greater than the spacing between said conductive elements; and   a single electrical signal feed assembly integrally connected with said other conductive element at only one of said opposing edges for electrically exciting both of said radiation slots from a single signal   
     
     
        feed junction. .Iaddend. .Iadd. 6.  An assembly according to claim 5 wherein said conductive elements and said sheet of dielectric material each comprise part of a single sheet of dielectric material metallically cladded on opposite sides thereof. .Iaddend. .Iadd. 7. An antenna structure comprising: an electrically conducting ground surface,   a single layer electrically conducting surface comprising both an r.f. radiator conducting area and an r.f. feedline conducting area integrally connected thereto and formed therewith,   a dielectric sheet disposed between said ground surface and the single layer electrically conducting surface,   said conducting surfaces defining a pair of radiation slots between opposing edges of said r.f. radiator and said ground surface, said radiation slots being longitudinally spaced apart by a predetermined distance approximately equal to one-half wavelength at the anticipated operating frequency of said antenna structure;   each of which radiation slots emanates radiation therefrom such that radiation patterns developed are in substantially the same direction;   said radiation slots having a length dimension equal to the entire length of said opposing edges, which length dimension is greater than the spacing between said surfaces; and   said r.f. feedline being connected to the outside edge of one only of said opposing edges of said r.f. radiation conducting area to at least one predetermined point on the periphery of said radiator conducting area. .Iaddend.