US 4,069,483 AGranted

Coupled fed magnetic 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 coupled fed magnetic microstrip dipole antenna consisting of a thin eleically conducting, rectangular-shaped radiating element (resonator) and a nonradiating coupler formed on one surface of a dielectric substrate, the ground plane being on the opposite surface. The radiating element has one end shorted to the ground plane. There is only a single mode of oscillation. Oscillation takes place along the length of the radiating element, and the length determines the resonant frequency. The feed point is normally located at the end of the coupler; energy is in turn coupled to the radiating element. However, the feed point can be located along the uncoupled edge of the coupler. Input impedance matching is determined by a combination of the coupler length and the separation between the coupler and the radiating element, and also the feed location when fed along the uncoupled edge of the coupler.

Claims9

Dependent claims

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

a. a thin ground plane conductor;
b. a thin rectangular microstrip radiating element and a separate thin rectangular-shaped microstrip nonradiating coupler alongside and spaced apart from said radiating element;
c. said radiating element and non-radiating coupler being parallel to each other in the same plane and equally spaced from said ground plane;
d. said radiating element and nonradiating coupler being electrically separated from said ground plane by a dielectric substrate;
e. said radiating element being shorted to the ground plane at one end of the length thereof;
f. said nonradiating coupler being fed from a coaxial-to-microstrip adapter, the center pin of said adapter extending through said ground plane and dielectric substrate to a feed point on said nonradiating coupler;
g. the length of said radiating element determining the resonant frequency of said antenna;
h. the antenna input impedance being variable to match most practical impedances by varying any of the coupler length and the distance between said radiating element and said nonradiating coupler without affecting the radiation pattern of the antenna.

5 more elements

Dependencies are inferred from the claim text.