Method of manufacturing a printed antenna

• US 5,709,832 A
• Filed: 06/02/1995
• Issued: 01/20/1998
• Est. Priority Date: 06/02/1995
• Status: Expired due to Fees

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Lampe, Ross Warren, Hayes, Gerard James
• Primary Examiner(s): Ortiz, Angela Y.
• Application Number:
  US08/460,578
• Time in Patent Office: 963 Days
• Field of Search: 264/129, 264/135, 264/259, 264/267, 264/265, 264/271.1, 264/275, 264/297.2, 264/297.8, 264/272.11
• US Class Current: 264/272.11
• CPC Class Codes: H01Q 1/40 Radiating elements coated with or embedded in protective material
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence

Abstract

A method of manufacturing a printed antenna is disclosed which involves the steps of: providing a printed circuit board of desired length and width having a first side, a second side, a feed open, and an open end; fabricating a main radiating element of a desired electrical length on one of the printed circuit board sides; and, overmolding both sides of the printed circuit board. The printed circuit board is made of a dielectric material having a minimum degree of flexibility and the overmolding step is accomplished by injection or insertion molding a low-loss dielectric material on the printed circuit board. In addition, the manufacturing method includes the step of incorporating a feed port with the printed antenna, wherein the main radiating element is coupled to a signal feed portion thereof.

Claims

1. A method of manufacturing a printed monopole antenna, comprising the following steps:

(a) providing a first substantially planar printed circuit board of desired length and width having a first side, a second side, a feed end, and an open end, wherein said first printed circuit board is made of a dielectric material having at least a minimum degree of flexibility;

(b) incorporating a feed port with said printed monopole antenna, said feed port having a signal feed portion and a ground portion;

(c) fabricating a main radiating element of a desired electrical length on said first printed circuit board first side, wherein said main radiating element is coupled to said signal feed portion of said feed port;

(d) fabricating at least one additional radiating element having an electrical length different than said main radiating element electrical length on said first printed circuit board first side, said additional radiating elements not being connected to said feed port, wherein said printed monopole antenna is resonant at a plurality of frequency bands through electrical coupling of said additional radiating elements with said main radiating element; and

(e) overmolding both sides of said printed circuit board.

2. A method of manufacturing a printed monopole antenna, comprising the following steps:

(a) providing a first substantially planar printed circuit board of desired length and width having a first side, a second side, a feed end, and an open end, wherein said first printed circuit board is made of a dielectric material having at least a minimum degree of flexibility;

(b) fabricating a main radiating element of a desired electrical length on said first printed circuit board first side;

(c) providing a second substantially planar printed circuit board of desired length and width having a first side and a second side, wherein said second printed circuit board is positioned so that said second printed circuit board second side is adjacent said first printed circuit board first side;

(d) fabricating at least one additional radiating element on said second printed circuit board first side, wherein said printed monopole antenna is resonant at a plurality of frequency bands; and

(e) overmolding said first and second printed circuit boards.

3. The method of claim 2, wherein said second printed circuit board is spaced a specified distance from said first printed circuit board to maintain a minimum voltage standing wave ratio at an antenna feed point.

4. A method of manufacturing a printed monopole antenna, comprising the following steps:

(a) providing a first substantially planar printed circuit board of desired length and width having a first side, a second side, a feed end, and an open end, wherein said first printed circuit board is made of a dielectric material having at least a minimum degree of flexibility;

(b) fabricating a main radiating element of a desired electrical length on said first printed circuit board first side;

(c) fabricating a parasitic element of specified area on said first printed circuit board second side, said parasitic element tuning said main radiating element to have a secondary resonance within a desired frequency band; and

(d) overmolding both sides of said printed circuit board.

5. The method of claim 4, wherein said parasitic element is made of a conductive material.

6. The method of claim 4, wherein said parasitic element is sized to be a non-resonant element.

7. The method of claim 4, wherein said parasitic element is positioned at said open end of said first printed circuit board second side.

8. The method of claim 4, wherein said desired frequency band does not include an integer multiple of a primary resonance frequency of said main radiating element.