Mobile communications antenna assembly

• US 5,515,064 A
• Filed: 06/25/1993
• Issued: 05/07/1996
• Est. Priority Date: 06/25/1993
• Status: Expired due to Term

• Current Assignee: Andrew Corporation (CommScope Holding Company, Inc.)
• Original Assignee: Allen Telecom Group, Inc. (CommScope Holding Company, Inc.)
• Inventors: Bacnik, James A., Hadzoglou, James
• Primary Examiner(s): Wimer, Michael C.
• Application Number:
  US08/083,054
• Time in Patent Office: 1,047 Days
• Field of Search: 343/715, 343/873, 343/713, 343/860
• US Class Current: 343/860
• CPC Class Codes: H01Q 1/1285 with capacitive feeding through the windscreen

Abstract

A window mounted antenna system having a foot or exterior support member attached to an antenna radiator or whip and typically mounted on the outside of a window or dielectric member comprised of a plastic decorative housing, a conductive foot portion which acts as the coupling capacitor and is inserted into the cover and conductively connected to the radiating member or whip, and a fastener for attaching the whip to the foot or base portion. The conductive foot includes attachment fingers insertable into the housing and retained in place upon insertion therein, and one or more flanges for receiving a fastener passed through the end of the antenna. A coupling assembly disposed on the other side of the window includes a formed or stamped conductive element which incorporates the various conductive components which make up the coupling assembly. The conductive components are overmolded with a nonconductive support material to produce an integrated structure incorporating the various components of the coupling assembly.

Claims

1. An antenna system usable to radiate and receive radio frequency energy generated by and received by a transceiver at frequencies in the UHF frequency range and adapted for use with and attachment to a dielectric member, comprising:

a radiating member;

a support member attached to one end of said radiating member and mountable on one surface of the dielectric member; and

a coupling system mountable on a second surface of the dielectric member in juxtaposition with said support member and connectable to the transceiver for coupling said radio frequency energy through the dielectric member between the transceiver and said radiating member;

said support member including a non-conductive body portion and a conductive coupling member;

said non-conductive body portion having a first side positionable adjacent said one surface of the dielectric member, said body portion defining an opening formed therein through said first side thereof,

a raised portion on a second side thereof and a gap in said raised portion permitting passage therethrough of said one end of said radiating member, and a bore passing through at least a portion of said raised portion,

said bore intersecting said one end of said radiating member passing through said gap for receiving a fastener engageable with said one end of said radiating member for fastening said radiating member to said support member;

said conductive coupling member having a generally planar portion received in said opening formed in said non-conductive body portion, a plurality of fastening projections insertable into said non-conductive body portion for retaining said conductive coupling member in place with said generally planar portion thereof co-planar with the surface of said first side of said non-conductive body portion, and at least one projecting flange portion oriented transverse to the plane of said generally planar portion and extending through said opening into the raised portion of said non-conductive body portion and intersecting said bore for receiving the fastener passing through said bore and said one end of said radiating member to fasten said radiating member to said support member with said radiating member thereby being firmly connected to said conductive coupling member.

2. An antenna system as claimed in claim 1 wherein said conductive coupling member is press fit into said non-conductive body portion.

3. An antenna system as claimed in claim 2 wherein said fastening projections of said conductive coupling member are disposed transverse to the plane of said planar portion and include barbs at the free ends thereof engageable with said non-conductive body portion for retaining said conductive coupling member against removal therefrom.

4. An antenna system as claimed in claim 3 wherein said non-conductive body portion includes a plurality of channels located adjacent the periphery of said opening and extending into said raised portion for receiving said fastening projections of said conductive coupling member.

5. An antenna system as claimed in claim 1 wherein said fastener is a threaded fastener and said projecting flange portion of said conductive coupling member includes a threaded opening engageable with said fastener passing through said one end of said radiating member for connecting said radiating member to said conductive coupling member and thereby to said support member.

6. An antenna system as claimed in claim 5 wherein said projecting flange portion of said conductive coupling member includes a pair of flanges disposed on opposite sides of said one end of said radiating member for retaining said radiating member therebetween, one of said pair of flanges being adapted to engage said fastener, said fastener passing through said bore, the other of said flanges, said radiating member and into said one flange and operable to tighten said flanges against said one end of said radiating member to retain said radiating member at a selected angular position relative to said support member.

7. An antenna system usable to radiate and receive radio frequency energy generated by and received by a transceiver at frequencies in the UHF frequency range and adapted for use with and attachment to a dielectric member, comprising:

a radiating member;

a support member attached to one end of said radiating member and mountable on one surface of the dielectric member; and

a coupling system mountable on a second surface of the dielectric member in juxtaposition with said support member and connectable to the transceiver for coupling said radio frequency energy through the dielectric member between the transceiver and said radiating member;

said coupling system consisting of three elements, a one-piece electrically conductive member of fixed shape, an external electrically conductive connector, and an electrically non-conductive body;

said one-piece conductive member comprised of a first generally planar central conductive portion defining a coupling plate, a second generally planar closed loop conductive portion surrounding said central portion and defining a counterpoise for said antenna system, a third intermediate conductive portion interconnecting said first central conductive coupling plate portion and said second closed loop conductive counterpoise portion, and a fourth conductive connection stub portion oriented transverse to the plane of said first central conductive coupling plate portion for connection to said external connector;

said first central conductive coupling plate portion, said third intermediate conductive portion and at least part of said second closed loop conductive counterpoise portion lying in a common plane, said second closed loop conductive counterpoise portion including a conductive peripheral portion oriented transverse to said common plane;

said conductive connector having an annular body portion electrically connected to said conductive peripheral portion of said second closed loop conductive counterpoise portion and a center conductor disposed within said annular body portion and electrically connected to said fourth conductive connection stub portion; and

said non-conductive body being associated with and covering a substantial portion of the inner surface of said fixed shape one-piece conductive member including substantially covering said fourth conductive connection stub portion, a major portion of said center conductor of said connector, and a major portion of the inner surfaces of said connector annular body portion.

8. An antenna system as claimed in claim 7 wherein said non-conductive body is molded to said one-piece fixed shape conductive member.

9. An antenna system as claimed in claim 8 wherein said non-conductive body is molded from natural polyphenylene oxide.

10. An antenna system as claimed in claim 7 wherein a portion of said non-conductive body is disposed between said first central conductive coupling plate portion and said second closed loop conductive counterpoise portion of said one-piece conductive member with the lower surface of said non-conductive body lying in said common plane.

11. An antenna system as claimed in claim 7 wherein said second generally planar closed loop conductive counterpoise portion and said first central conductive coupling plate portion are generally rectangular in shape.

12. An antenna system as claimed in claim 11 wherein said second rectangular closed loop conductive counterpoise portion is formed by four interconnected legs, with each of said legs having a first portion lying in said common plane and a second outer portion extending transverse to said common plane from the outer peripheral edge of said first portion, said second outer portions forming said conductive peripheral portion oriented transverse to said common plane.

13. An antenna system as claimed in claim 12 including a plurality of apertures formed in said transverse conductive peripheral portion, and wherein said non-conductive body is formed with projections passing through said apertures for maintaining the relative positions of said non-conductive body and said one-piece conductive member.

14. An antenna system as claimed in claim 7 including a cover for said coupling system.

15. An antenna system as claimed in claim 14 wherein said cover includes an expansive top surface and a plurality of depending walls, and wherein one of said depending walls includes an opening therein, said connector body portion passing through said opening when said cover is attached to said coupling system.

16. An antenna system as claimed in claim 15 wherein at least one of said depending walls of said cover is formed with a projection thereon, and said one-piece conductive member includes an opening therein positioned to engage said projection when said cover is attached to said coupling system for retaining said cover in place.

17. An antenna system as claimed in claim 7 wherein said

said fourth conductive connection stub portion is electrically connected to and extends from said third intermediate conductive portion in a plane transverse to the plane of said first central conductive coupling plate portion.