Portable wireless unit

• US 20010021643A1
• Filed: 03/07/2001
• Published: 09/13/2001
• Est. Priority Date: 03/07/2000
• Status: Active Grant

• Current Assignee: Lenovo Innovations Ltd Hong Kong (Lenovo Group Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Itoh, Ryoh
• Granted Patent: US 6,856,819 B2
• Time in Patent Office: Days
• US Class Current: 455/575.7
• 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 19/005 Patch antenna using one or more coplanar parasitic elements
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• 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

A portable wireless unit of the invention has a first plane antenna smaller than an antenna size determined by a desired frequency, and a second plane antenna presenting an antenna size determined by the desired frequency on the whole by coupling with the first plane antenna.

Claims

1. A portable wireless unit comprising:

a first plane antenna smaller than an antenna size determined by a desired frequency, and

a second plane antenna presenting an antenna size determined by said desired frequency on the whole by coupling with said first plane antenna.

2. The portable wiring machine of

claim 1

, wherein said first plane antenna is disposed on a circuit board incorporated in a case as a casing.

3. The portable wiring machine of

claim 1

, wherein said second plane antenna is provided on outer surface or inner surface of the case as a casing.

4. The portable wiring machine of

claim 1

, wherein said first plane antenna is a plate-form inverted F type antenna, microstrip antenna, or chip antenna.

5. The portable wiring machine of

claim 1

, wherein said first plane antenna has a narrow band.

6. The portable wiring machine of

claim 1

, wherein said first plane antenna is supplied with current, and said second plane antenna is parasitic.

7. The portable wiring machine of

claim 1

, wherein said second plane antenna is disposed so as to be overlaid in a part or whole on said first plane antenna.