Xm Satellite Radio Inc.

Stanislav Licul

Argyrios A Chatzipetros

A folded helical antenna. Generally, the inventive antenna includes plural radiating elements of conductive material. In the preferred embodiment, the antenna is a quadrifilar helix antenna having four radiating elements. Each radiating element is constrained into a helical shape. In accordance with the present teachings, each radiating element extends in a first direction and has a portion thereof folded in a second direction, the second direction being substantially parallel to the first direction. The novel method of making a quadrifilar helix antenna of the invention includes the steps of: ascertaining desired antenna characteristics for a given application; ascertaining limitations on antenna height for the application; fabricating a helical antenna in accordance with the desired antenna characteristics; and adjusting the height of the antenna in accordance with the limitations by folding the radiating elements thereof.

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Blacksburg, VA, United States of America

Stanislav Licul