Remotely tuned conductive-body antenna system

• US 3,916,413 A
• Filed: 12/21/1973
• Issued: 10/28/1975
• Est. Priority Date: 12/21/1973
• Status: Expired due to Term

• Current Assignee: Ross Alan Davis
• Original Assignee: Ross Alan Davis
• Inventors: Davis, Ross Alan
• Primary Examiner(s): Lieberman, Eli
• Application Number:
  US05/427,259
• Time in Patent Office: 676 Days
• Field of Search: 343/711,712,713,856
• US Class Current: 343/712
• CPC Class Codes: H01Q 1/1271 for mounting on windscreens

Abstract

An improved remotely tuned conductive-body antenna system is provided which gives superior signal coupling between the low impedance conductive body and the associated radio-frequency circuits with minimum loss of selectivity or '"'"''"'"''"'"''"'"'Q'"'"''"'"''"'"''"'"' in those circuits by increasing the inductive reactance of the coupling means insofar as the associated radio-frequency circuits are concerned without mis-matching the input to the coupling means and the low impedance conductive-body signal source.

Claims

1. A vehicle body antenna system, including:

a windshield opening having a conductive perimeter and being responsive to a radio frequency field to produce at points across the perimeter a potential at said radio-frequency;

radio frequency circuits remote from said discontinuity and forming a part of associated radio apparatus;

coupling means including a secondary winding directly connected to at-least-one point of the conductive perimeter and juxtaposed to at-least-one portion thereof to form therewith a transformer with a single turn primary; and

, tuning means coupled to said transformer and physically positioned remote from said discontinuity and proximate to said radio frequency circuits.

2. Apparatus according to claim 1 in which said secondary winding is connected at its other end to a capacitor which, in turn, is connected to a point on said conductive perimeter opposite said at-least-one point.

3. Apparatus according to claim 2 in which the magnitude of said capacitor is in the order of 0.01 microfarads.

4. Apparatus according to claim 1 in which said secondary winding comprises first and second sections each having a winding direction opposite from the other section and each section juxtaposed to a different portion of said conductive perimeter from said other section.

5. Apparatus according to claim 1 in which said radio frequency circuits includes tuning apparatus, said tuning apparatus being mechanically coupled to said tuning means.