Antenna systems including internal planar inverted-F antennas coupled with retractable antennas and wireless communicators incorporating same

• US 6,380,903 B1
• Filed: 02/16/2001
• Issued: 04/30/2002
• Est. Priority Date: 02/16/2001
• Status: Expired due to Term

• Current Assignee: Unwired Planet LLC (JP Morgan Chase & Co)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Sadler, Robert, Hayes, Gerard James
• Primary Examiner(s): Phan, T
• Application Number:
  US09/785,822
• Time in Patent Office: 438 Days
• Field of Search: H01/Q.124, H01/Q.138, H01/Q 2.100, 343/700.MS, 343/702, 343/725, 343/829, 343/846, 343/895, 343/901
• US Class Current: 343/725
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 11/08 Helical antennas
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence

Abstract

Antenna systems for use with wireless communicators, such as radiotelephones, are provided and include a first antenna configured to be internally mounted within a wireless communicator and a retractable, second antenna that couples with the first antenna when extended. The internal, first antenna is resonant within one or more frequency bands and the retractable, second antenna couples with the internal, first antenna so as to enhance one or more of the resonant frequency bands of the internal, first antenna.

Claims

1. A wireless communicator, comprising:

a housing configured to enclose at least one of a receiver that receives wireless communications signals and a transmitter that transmits wireless communications signals;

a ground plane disposed within the housing;

an inverted-F antenna disposed within the housing, wherein the inverted-F antenna is resonant within one or more frequency bands, wherein the inverted-F antenna comprises;

a conductive element in adjacent, spaced-apart relationship with the ground plane, wherein the conductive element comprises an elongated edge that defines a first direction, and an elongated gap that extends from the elongated edge in a second direction that is transverse to the first direction;

a signal feed extending from the conductive element, wherein the signal feed is configured to electrically connect the conductive element to the at least one receiver and transmitter; and

a ground feed extending from the conductive element adjacent the signal feed and electrically grounding the conductive element; and

a retractable antenna that is movable between a retracted position and an extended position external to the housing, wherein the retractable antenna is directly connected with the inverted-F antenna when the retractable antenna is in the extended position, wherein the retractable antenna electrically couples with the inverted-F antenna so as to enhance one or more of the resonant frequency bands of the inverted-F antenna, wherein the retractable antenna is movable along the second direction in spaced-apart relationship with the gap such that the retractable antenna does not traverse the gap.

2. The wireless communicator according to claim 1, wherein the ground plane comprises a printed circuit board (PCB).

3. The wireless communicator according to claim 1, wherein the ground plane comprises a shield can disposed within the housing.

4. The wireless communicator according to claim 1, wherein the retractable antenna comprises an elongated rod having a free end and a helix antenna element at the free end.

5. The wireless communicator according to claim 1, wherein the retractable antenna is parasitically coupled with the inverted-F antenna when the retractable antenna is in the extended position.

6. The wireless communicator according to claim 1, wherein the inverted-F antenna is resonant within first and second frequency bands and wherein the retractable antenna electrically couples with the inverted-F antenna so as to enhance one of the first and second frequency bands.

7. The wireless communicator according to claim 1, wherein the wireless communicator comprises a radiotelephone.