US 3,947,850 AGranted

Notch fed electric microstrip dipole antenna

AssigneeThe United States of America as represented by the Secretary of the Navy

InventorCyril M. Kaloi

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Abstract

A notch fed electric microstrip dipole antenna consisting of a thin electally conducting, rectangular-shaped element formed on one surface of a dielectric substrate, the ground plane being on the opposite surface. The length of the element determines the resonant frequency. The feed point is located in a notch along the centerline of the antenna length and the input impedance can be varied by moving the feed point along the centerline of the antenna without affecting the radiation pattern. Of all the many types of microstrip antennas built to date, this antenna offers the best advantages as far as arraying of the elements are concerned. The notched antenna can be arrayed using microstrip interconnecting transmission lines. The corner losses in the clad material and the width of the notch determines how narrow the element can be made. The purpose of the notch feed system is to interconnect any array of elements at the elements' optimum feed point using microstrip transmission lines.

Claims12

Dependent claims

A notch fed electric microstrip dipole antenna having low physical profile and conformal arraying capability, comprising:

a. a thin ground plane conductor;
b. a thin rectangular radiation element having a notch extending into said element from one end thereof along the centerline of the element length, said element being spaced from said ground plane;
c. said radiating element being electrically separated from said ground plane by a dielectric substrate;
d. said radiating element having an optimum feed point located along the centerline of the length thereof at the inner end of said notch;
e. said radiating element being fed from a coaxial-to-microstrip adapter, the center pin of said adapter extending through said ground plane and dielectric substrate to the plane of said radiating element;
f. the length of said radiating element determining the resonant frequency of said antenna;
g. the antenna input impedance being variable to match most practical impedances as said feed point is moved along said centerline without affecting the antenna radiation pattern;
h. the antenna bandwidth being variable with the width of the radiating element and the spacing between said radiating element and said ground plane, the width of said notch being a factor as to the effective width of said element, said spacing between the radiating element and the ground plane having somewhat greater effect on the bandwidth than the element width.

5 more elements

Dependencies are inferred from the claim text.