FERRITE ANTENNA COUPLED TO RADIO FREQUENCY CURRENTS IN VEHICLE BODY

• US 3,717,876 A
• Filed: 04/23/1971
• Issued: 02/20/1973
• Est. Priority Date: 04/23/1971
• Status: Expired due to Term

• Current Assignee: Edward N. Willie, Walter K. Volkers
• Original Assignee: Edward N. Willie, Walter K. Volkers
• Inventors: Volkers, Walter K., Willie, Edward N.
• Primary Examiner(s): Lieberman, Eli
• Application Number:
  US05/137,021
• Time in Patent Office: 669 Days
• Field of Search: 343/711,712,720
• US Class Current: 343/712
• CPC Class Codes: H01Q 1/3283 side-mounted antennas, e.g. bumper-mounted, door-mounted mounted on windscreens H01Q1/1271
• CPC Class Codes: H01Q 1/44 using equipment having another main function to serve additionally as an antenna , e.g. means for giving an antenna an aesthetic aspectH01Q1/27 - H01Q1/34 take precedence

Abstract

An antenna system in which a Faraday cage acts as the primary antenna which intercepts the electromagnetic waves and reradiates them to a secondary antenna located within the Faraday cage.

Claims

1. An antenna system comprising a passive primary antenna for intercepting and reradiating electromagnetic energy, said primary antenna comprising an electrically conductive vehicle body having a roof portion and a body portion and at least one electrically conductive member connecting said roof portion to said body portion, said vehicle body being of a size which disturbs the field patterns of an incident electromagnetic radiation so as to cause equalizing currents to flow within said Electrically conductive member;

and a ferrite antenna for connection with a transmitter or receiver, said ferrite antenna being disposed in close proximity to said electrically conductive member, and having its axis skewed at substantially right angles to said electrically conductive member so as to couple at least a portion of the magnetic flux induced by said equalizing currents flowing in said electrically conductive member.