Dual band antenna for a handset

• US 6,307,512 B1
• Filed: 12/15/1999
• Issued: 10/23/2001
• Est. Priority Date: 12/22/1998
• Status: Expired due to Term

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Mobile Phones UK Limited (Nokia Corporation)
• Inventors: Geeraert, Francis
• Primary Examiner(s): Phan, T
• Application Number:
  US09/461,619
• Time in Patent Office: 678 Days
• Field of Search: H01/Q.124, H01/Q.138, 343/700.MS, 343/702, 343/74.G, 343/752, 343/767, 343/770, 343/846, 343/848, 343/866
• US Class Current: 343/702
• CPC Class Codes: B29L 2031/3456 Antennas, e.g. radomes
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 13/10 Resonant slot antennas
• CPC Class Codes: H01Q 5/371 Branching current paths
• 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 9/0442 with particular tuning means

Abstract

An antenna device for a handportable phone having a first conducting layer acting as resonator plane, a second conducting layer arranged substantially in parallel with the first conducting layer and acting as ground plane for the antenna device, and feeding means connected to said first and the second conducting layer for feeding an RF signal to the antenna device. The first conducting layer is provided as a radiating pattern having a common frequency part coherent with two further parts where said common frequency part in combination with said two further parts defines a first radiating element and a second radiating element, respectively. Capacitive couplings between the first and the second conducting areas adjacent to the crossing areas between said common frequency part and the respective one of said two further parts.

Claims

1. An antenna device comprising:

a first conducting layer acting as a resonator plane;

a second conducting layer arranged substantially in parallel with the first conducting layer and acting as a ground plane for the antenna device;

feeding means connected to said first and the second conducting layer for feeding an RF signal to the antenna device;

wherein said first conducting layer is provided as a radiating pattern having a common frequency part coherent with at least two further parts where said common frequency part in combination with said at least two further parts defines at least two radiating elements, respectively; and

capacitive couplings between the first and the second conducting layers adjacent to crossing areas between said common frequency part and the respective one of said at least two further parts, wherein said common frequency part carries currents in at least two frequency bands and therein comprises a part of said at least two radiating elements of the antenna device, the antenna device being operable in at least two frequency bands.

2. An antenna device according to claim 1, wherein the first conducting layer is coated onto a dielectric body.

3. An antenna device according to claim 2, wherein the dielectric body is provided by an injection molding process including two shots.

4. An antenna device according to claim 3, wherein the material used in one of the two injection molding shots is a resin repelling metal in a subsequent coating process, and wherein the material used in the second shot is a resin to which metal in the subsequent coating process adhere.

5. An antenna device according to claim 2, wherein the dielectric body is provided with coupling means for establishing a releasable interconnection with a separate metal body acting as the second conducting layer of the device.

6. An antenna device according to claim 2, wherein the feeding means includes a bore through the dielectric body as a connection via connecting the first conducting layer to a connection pad on the rear side of the dielectric body.

7. An antenna device according to claim 1, wherein the capacitive coupling between said first and said second conducting layers is partly obtained by reducing the distance between said first conducting layer and said second conducting layer.

8. An antenna device according to claim 7, wherein the dielectric body is provided with means for releasable interconnection with a separate metal body acting as the second conducting layer of the device, and wherein the separate metal body is provided with a stepwise raised part to establish the capacitive coupling.