Non-foster active impedance circuit for electrically small antennas

US9960484B2 · kind B2 · utility

Assignee

• The United States of America, as represented by Secretary of the Navy · US

Inventors

• Jia-Chi Samuel Chieh · San Diego, US
• Lu Xu · San Jose, US
• Albert Ryu · San Diego, US
• John D. Rockway · San Diego, US
• Diana Arceo · San Diego, US
• Justin A. Church · San Diego, US

Key dates

• Filing date: Jul 7, 2015
• Grant date: May 1, 2018
• Expiry date: May 4, 2036

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03H11/00
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

An antenna comprising: a driven element; an input feed coupled to the driven element wherein the input feed is configured to be connected to a receiver; a non-Foster circuit having a negative impedance, wherein the non-Foster circuit is configured to actively load the antenna at a location on the antenna other than at the input feed; and wherein the antenna fits within an imaginary sphere having a radius a, and wherein the product ka is less than 0.5, where k is a wave number.