MULTIPLE RESONANT ANTENNA UNIT, ASSOCIATED PRINTED CIRCUIT BOARD AND RADIO COMMUNICATION DEVICE

• US 20090219215A1
• Filed: 10/18/2006
• Published: 09/03/2009
• Est. Priority Date: 10/18/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: BenQ Mobile GMBH & Company (Qisda Corporation)
• Inventors: Schreiber, Michael, Huber, Stefan
• Granted Patent: US 8,816,911 B2
• Time in Patent Office: Days
• US Class Current: 343/702
• 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 5/357 using a single feed point
• CPC Class Codes: H01Q 5/50 Feeding or matching arrangements for broad-band or multi-band operation
• CPC Class Codes: H01Q 9/04 Resonant antennas
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

A multiple resonant antenna unit (AT2) comprises a current feed area (SPI) from which only a single, spiral-like antenna branch (AZI) emanates. The total course of this spiral-like antenna branch (AZI) forms a first resonant antenna structure for a low frequency range and at least one partial section (SE15) inside the total course of this spiral-like antenna structure (AZI) forms a second resonant antenna structure for a higher frequency range.

Claims

1. A multiple resonant antenna unit comprising a current feed region, from which a single, spiral antenna branch emanates, wherein the total course of the spiral antenna branch forms a first resonant antenna structure for a lower frequency range and at least one portion inside the total course of the spiral antenna branch forms a second resonant antenna structure for a higher frequency range.

2. The multiple resonant antenna unit according to claim 1, wherein the portion for the higher frequency range is inductively and/or capacitively coupled to a preceding portion in the total course of the spiral antenna branch for the electromagnetic excitation of the portion.

3. The multiple resonant antenna unit according to claim 1, wherein the portion for the higher frequency range is inductively and/or capacitively coupled to a surface element which is inserted between the current feed region and the input-side end of the spiral antenna branch for the electromagnetic excitation of the portion.

4. The multiple resonant antenna unit according to claim 1, wherein the spiral antenna branch is composed of portions arranged at right angles to one another.

5. The multiple resonant antenna unit according to claim 1, wherein the portions of the spiral antenna branch are formed by lamellar conductive tracks or wires.

6. The multiple resonant antenna unit according to claim 1, wherein the portion for the higher frequency range is formed by the freely protruding, end-side portion of the spiral antenna branch (AZ1).

7. The multiple resonant antenna unit according claim 6, wherein the ratio of the length of the end-side portion to the total length of the spiral antenna branch is substantially the same as that of the higher frequency range to the lower frequency range.

8. The multiple resonant antenna unit according claim 7, wherein the total length of the spiral antenna branch is selected to be between 70 and 90 mm.

9. The multiple resonant antenna unit according to claim 7, wherein the freely protruding, end-side portion of the spiral antenna branch has a length of between 10 and 25 mm.

10. The multiple resonant antenna unit according to claim 1, wherein a meandering portion is coupled to the input-side portion after the current feed region and before the input-side portion of the spiral antenna branch.

11. The multiple resonant antenna unit according to claim 1, wherein the spiral antenna branch comprises one or more shunt branches at its longitudinally extending, input-side portion in order to enlarge the band width of the lower frequency range.

12. A printed circuit board with at least one multiple resonant antenna unit comprising a current feed region, from which a single, spiral antenna branch emanates, wherein the total course of the spiral antenna branch forms a first resonant antenna structure for a lower frequency range and at least one portion inside the total course of the spiral antenna branch forms a second resonant antenna structure for a higher frequency range.

13. The printed circuit board according to claim 12, wherein the multiple resonant antenna unit is fixed to the lower end face of the printed circuit board which is further away from the position of the display of the printed circuit board then the upper end face thereof.

14. A radio communication device with at least one multiple resonant antenna unit comprising a current feed region, from which a single, spiral antenna branch emanates, wherein the total course of the spiral antenna branch forms a first resonant antenna structure for a lower frequency range and at least one portion inside the total course of the spiral antenna branch forms a second resonant antenna structure for a higher frequency range.

15. The radio communication device according to claim 14, wherein the multiple resonant antenna unit is coupled to the printed circuit board thereof inside the housing of the radio communication device.