초록 ▼

An antenna of the type having a central driven element and a plurality of surrounding parasitic elements is shown. Further, there is circuitry for modifying the basic omnidirectional pattern of said antenna to a directional pattern by normally capacitively coupling the parasitic elements to ground b

An antenna of the type having a central driven element and a plurality of surrounding parasitic elements is shown. Further, there is circuitry for modifying the basic omnidirectional pattern of said antenna to a directional pattern by normally capacitively coupling the parasitic elements to ground but on a selective basis changing some of the parasitic elements to be inductively coupled to ground whereby they act as reflectors and provide an eccentric signal radiation pattern. By cyclically altering the connection of various parasitic elements in their coupling to ground, a rotating directional signal is produced.

대표청구항 ▼

Electronically signal direction oriented antenna means comprising, in combination: ground plane means; driven element means mounted on said ground plane means; a plurality of parasitic elements, each of equal length and having a base portion juxtaposed said driven element means and mounted at the ba

Electronically signal direction oriented antenna means comprising, in combination: ground plane means; driven element means mounted on said ground plane means; a plurality of parasitic elements, each of equal length and having a base portion juxtaposed said driven element means and mounted at the base portion on said ground plane means; and selector means, connected to one end of each of said parasitic elements below said ground plane means, for electrically and selectively altering the impedance at the base portion of said parasitic elements from director to reflector means by changing the impedance from capacitive to inductive while maintaining the same mechanical radiating length.