Wireless portable device including internal broadcast receiver

• US 8,472,908 B2
• Filed: 08/02/2006
• Issued: 06/25/2013
• Est. Priority Date: 04/03/2006
• Status: Active Grant

• Current Assignee: Fractus SA
• Original Assignee: Fractus SA
• Inventors: Anguera, Jaume, Sanz, Alfonso
• Primary Examiner(s): AKINYEMI, AJIBOLA A
• Application Number:
  US12/226,024
• Publication Number:
  US 20090156151A1
• Time in Patent Office: 2,519 Days
• Field of Search: 455/272
• US Class Current: 455/272
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence

Abstract

The invention relates, inter alia, to a wireless portable device for radio communication, comprising at least one antenna element (1210), at least one ground-plane (1250), radio frequency communication circuitry (1310) and at least one matching network (1320). The device is arranged for communication involving, at least, receiving and processing a signal in accordance with a communication system having a bandwidth with a lower frequency limit (f_min) and an upper frequency limit (f_max). The antenna element is a non-resonant antenna element for frequencies from said lower frequency limit (f_min) up to said higher frequency limit (f_min). Another aspect of the invention involves two antenna elements (2001, 2002) tuned around two different central frequencies within a frequency band, and a switch (2003) for selectively operatively connecting one of said at least two antenna elements to a radio frequency communication circuitry (2000).

Claims

1. A wireless portable device for radio communication, comprising:

at least one antenna element included within the wireless portable device;

at least one ground-plane having a length and a width, no ground-plane having a width larger than 55 mm;

radio frequency communication circuitry for processing a signal received through the at least one antenna element;

at least one matching network operatively arranged between the at least one antenna element and the radio frequency communication circuitry;

the device is arranged for communication involving at least, receiving and processing a signal in accordance with a communication system having a bandwidth with a lower frequency limit (f_min) and un upper frequency limit (f_max);

the at least one antenna element operates as a non-resonant antenna element for frequencies that are not lower than the lower frequency limit (f_min) and not higher than the higher frequency limit (f_max) so that an imaginary part of an input impedance of the at least one antenna element is not equal to zero for any frequency that is not lower than the lower frequency limit (f_min) and not higher than the higher frequency limit (f_max); and

the at least one antenna element is configured so that the imaginary part of the input impedance for any selected frequency not lower than the lower frequency limit (f_min) and not higher than the higher frequency limit (f_max) is closer to zero than the imaginary part of the input impedance for any frequency not lower than the lower frequency limit (f_min) and lower than the selected frequency.

2. The device according to claim 1, wherein the at least one matching network comprises a plurality of different matching networks and switching means arranged so as to selectively operatively connect one of the matching networks between the at least one antenna element and the communication circuitry in accordance with a selected frequency sub-band within the lower frequency limit (f_min) and upper frequency limit (f_max).

3. The device according to claim 1, wherein the lower frequency limit is 88 MHz and the higher frequency limit is 108 MHz.

4. The device according to claim 1, wherein the lower frequency limit is 180 MHz and the higher frequency limit is 210 MHz.

5. The device according to claim 1, the device being a handheld device.

6. The device according to claim 1, wherein the device includes means for processing digital television signals and for displaying corresponding video images.

7. The device according to claim 1, wherein the device further comprising:

a casing housing, the at least one ground plane, and at least one antenna element, the casing being provided with an external conductive coating connected with the at least one ground plane so as to connect a user'"'"'s hand to the at least one ground plane when the user is using the device.

8. The device according to claim 1, wherein at least one of the at least one antenna element includes a portion shaped as a space-filling curve.

9. The device according to claim 8, wherein the space-filling curve is fitted over a flat surface.

10. The device according to claim 8, wherein the space-filling curve comprises at least five segments, wherein each of the at least five segments forms an angle with each adjacent segment in the space-filling curve, wherein at least three of the at least five segments of the space-filling curve are shorter than one-fifth of a longest free-space operating wavelength of the antenna, wherein each angle between adjacent segments is less than 180°

, and at least two of the angles between adjacent sections are less than approximately 115°

.

11. The device according to claim 10, wherein a majority of the at least five segments of the space-filling curve are shorter than one-fifth of the longest free-space operating wavelength of the antenna.

12. The device according claim 1, wherein at least one of the at least one antenna element includes a portion shaped as a box-counting curve.

13. The device according to claim 12, wherein the space-filling curve has a box-counting dimension larger than 1.15.

14. The device according to claim 1, wherein at least one of the at least one antenna element includes a portion shaped as a grid dimension curve.

15. The device according to claim 14, wherein the space-filling curve has a grid dimension larger than 1.15.

16. The device according to claim 1, wherein each antenna element of the at least one antenna element fits in a rectangle, a largest side of which has a length that does not exceed one-fifth of a longest free-space operating wavelength of the at least one antenna element.

17. The device according to claim 1, wherein at least one of the at least one antenna element includes a portion having a multi-level structure.

18. A wireless portable device for radio communication, comprising:

at least one antenna element included within the wireless portable device;

at least one ground-plane having a length and a width, no ground-plane having a width larger than 55 mm;

radio frequency communication circuitry for processing a signal received through the at least one antenna element;

at least one matching network operatively arranged between the at least one antenna element and the communication circuitry;

the device is arranged for communication involving at least, receiving and processing a signal in accordance with a communication system having a bandwidth with a lower frequency limit (f_min) and a higher frequency limit (f_max);

the at least one antenna element operates as a non-resonant antenna element for frequencies that are not lower than the lower frequency limit (f_min) and not higher than the higher frequency limit (f_max) so that an imaginary part of an input impedance of the at least one antenna element is not equal to zero for any frequency that is not lower than the lower frequency limit (f_min) and not higher than the higher frequency limit (f_max); and

the at least one antenna element is configured so that the imaginary part of the input impedance, for any selected frequency not lower than the lower frequency limit (f_min) and not higher than the higher frequency limit (f_max) is closer to zero than the imaginary part of the input impedance for any frequency not higher than the higher frequency limit (f_max) and higher than the selected frequency.