Wide-band active antenna system for HF/VHF radio reception

US9225074B2 · kind B2 · utility

Assignee

• United States of America as represented by the Secretary of the Air Force · US

Inventors

• Brian Hicks · Melbourne, US
• Kenneth P. Stewart · Upper Marlboro, US
• Tracy Clarke · Glenn Dale, US
• Nagini P. Dalal · Torrance, US
• Henrique Schmitt · Greenbelt, US
• Paul S. Ray · Alexandria, US
• Stephen J. Burns · Hollis, US
• Namir E. Kassim · Annandale, US
• Emil J. Polisensky · Alexandria, US
• Norman R. Mcglothlin, Jr. · Alexandria, US

Key dates

• Filing date: Nov 5, 2013
• Grant date: Dec 29, 2015
• Expiry date: Jun 28, 2034

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01Q9/28
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

An active antenna system for receiving electromagnetic radiation at frequencies below 100 MHz. The system includes a vertical support mast; a front end electronics unit including an active balun, the front end electronics unit affixed to the support mast; two crossed-dipole antennas affixed oriented at about 90 degrees to each other, each crossed-dipole antenna having two arms formed of electrically conductive material, each arm having an isoceles triangular frame with an apex of the frame electrically connected to a feedpoint of the front end electronics unit, each arm also having a longitudinal member extending from the apex to the center of the base of the triangular shape and a cross member extending between sides of the triangular frame. The system can operate independently or as part of a long wavelength array for astronomical radio telescope applications.