Wireless device reconfigurable radiation desensitivity bracket systems and methods

• US 20050083234A1
• Filed: 09/14/2004
• Published: 04/21/2005
• Est. Priority Date: 04/11/2001
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Wireless Corporation (Kyocera Corporation)
• Inventors: Fabrega-Sanchez, Jorge, Poilasne, Gregory
• Granted Patent: US 7,394,430 B2
• Time in Patent Office: Days
• US Class Current: 343/700.MS
• CPC Class Codes: H01G 7/06 having a dielectric selected for the variation of its permittivity with applied voltage, i.e. ferroelectric capacitors electrets H01G7/02
• CPC Class Codes: H01P 1/203 Strip line filters
• CPC Class Codes: H01P 1/20336 Comb or interdigital filters
• CPC Class Codes: H01P 1/213 combining or separating two or more different frequencies H01P1/215 takes precedence
• CPC Class Codes: H01P 5/04 with variable factor of coupling
• CPC Class Codes: H01Q 1/00 Details of, or arrangements associated with, antennas arrangements for varying orientation of directional pattern H01Q3/00
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 13/02 Waveguide horns
• CPC Class Codes: H01Q 13/06 Waveguide mouths horns H01Q13/02
• CPC Class Codes: H01Q 13/203 Leaky coaxial lines
• CPC Class Codes: H01Q 3/44 varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element
• 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
• CPC Class Codes: H01Q 9/0442 with particular tuning means
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence
• CPC Class Codes: H01Q 9/28 Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence
• CPC Class Codes: H03B 5/1841 the frequency-determining element being a strip line resonator H03B5/1805, H03B5/1817, H03B5/1864 and H03B5/1882 take precedence
• CPC Class Codes: H03B 5/362 the amplifier being a single transistor H03B5/364 - H03B5/368 take precedence
• CPC Class Codes: H03F 1/56 Modifications of input or output impedances, not otherwise provided for
• CPC Class Codes: H03F 2200/372 : Noise reduction and elimination in amplifier
• CPC Class Codes: H03F 3/191 : Tuned amplifiers H03F3/193, H03F3/195 take precedence
• CPC Class Codes: H03H 7/20 : Two-port phase shifters providing an adjustable phase shift
• CPC Class Codes: H03J 5/246 : using electronic means H03J5/244 takes precedence
• CPC Class Codes: H03L 1/022 : by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature H03L1/021 takes precedence
• CPC Class Codes: H03L 7/18 : using a frequency divider or counter in the loop H03L7/20, H03L7/22 take precedence
• CPC Class Codes: H04B 1/30 : for homodyne or synchrodyne receivers demodulator circuits H03D1/22

Abstract

A wireless communications device reconfigurable radiation desensitivity bracket, and associated reconfigurable radiation desensitivity method are provided. The method includes: generating a radiated wave at a first frequency; in response to generating the radiated wave at the first frequency, creating a maximum current per units square (I/units²) through a minimal area of an electrical circuit groundplane; generating a radiated wave at a second frequency; in response to generating the radiated wave at the second frequency, maintaining the maximum I/units² through the minimal area of the groundplane. Alternately stated, the method controls the distribution of current flow through a groundplane, responsive to radiated emissions, as the wireless device changes operating frequency or communication band. More specifically, the method maintains the maximum I/units² through the minimal area of the groundplane by coupling the groundplane to a bracket having a selectable effective electrical length.

Claims

1. A wireless communications device with a reconfigurable radiation desensitivity bracket, the device comprising:

a transmitter;

an antenna connected to the transmitter;

an electrical circuit having a groundplane; and

,

a reconfigurable radiation desensitivity bracket coupled to the groundplane.

2. The device of claim 1 wherein the electrical circuit is selected from the group including components mounted on a printed circuit board (PCB), a display, a connector, and a keypad.

3. The device of claim 1 wherein the bracket has a selectable effective electrical length.

4. The device of claim 3 wherein the bracket includes a selectable electrical length section having a distal end, a proximal end, a control input to accept control signals, and a selectable effective electrical length responsive to the control signals.

5. The device of claim 4 wherein the bracket further includes a fixed electrical length section having a distal end, a proximal end, and a fixed physical length;

and,

wherein the combination of the selectable electrical length section and the fixed electrical length section provides a combined selectable effective electrical length responsive to the control signal.

6. The device of claim 4 wherein the bracket includes a plurality of selectable electrical length sections.

7. The device of claim 6 wherein the plurality of selectable electrical length sections are connected in a configuration selected from the group including connected to the groundplane, series-connected, parallel-connected, and combinations of the above-mentioned connection configurations.

8. The device of claim 5 wherein the bracket includes a plurality of fixed electrical length sections.

9. The device of claim 8 wherein the plurality of fixed electrical length sections are connected to a selectable electrical length section in a configuration selected from the group including connected to the groundplane, series-connected, parallel-connected, and combinations of the above-mentioned connection configurations.

10. The device of claim 4 wherein the selectable electrical length section is selected from the group including a FET, PIN diode, ferroelectric capacitor, varactor diode, and microelectromechanical system (MEMS) switch.

11. The device of claim 9 wherein the plurality of fixed electrical length sections form a matrix of adjoining conductive areas;

wherein a plurality of selectable electrical length sections couple between fixed electrical length sections; and

,

wherein at least one of the plurality of selectable electrical length sections is coupled to the groundplane.

12. The device of claim 5 wherein the fixed electrical length section is an element selected from the group including a wire, conductive paint, conductive trace, conductive pillow, fastener, and a member formed straight, L-shaped, O-shaped, and combinations of the above-mentioned forms.

13. The device of claim 5 further comprising:

a housing surrounding the electrical circuit; and

,

wherein the fixed electrical length section is a conductive element formed on the housing and coupled to the groundplane.

14. The device of claim 5 wherein the fixed electrical length section is a conductive trace formed on the electrical circuit.

15. The device of claim 1 wherein the transmitter is a wireless telephone transmitter.

16. The device of claim 4 wherein the transmitter is a wireless telephone transmitter selectively operating at a first frequency and a second frequency;

and,

wherein the bracket selectable electrical length section has a first effective electrical length, selected in response to the transmitter operating at the first frequency, and a second effective electrical length, selected in response to the transmitter operating at the second frequency.

17. The device of claim 4 further comprising:

a desensitivity control circuit having an input to accept frequency selection commands and an output connected to the selectable effective length sections, supplying control signals in response to the frequency selection commands.

18. The device of claim 5 wherein the electrical circuit is a liquid crystal display (LCD);

wherein the bracket includes;

a selectable electrical length section coupling between fixed electrical length sections; and

,

a plurality of fixed electrical length sections forming perimeter regions around the LCD.

19. A portable wireless telephone communications device with a reconfigurable radiation desensitivity bracket, the device comprising:

a telephone transceiver;

an antenna connected to the transceiver;

an electrical circuit having a groundplane; and

,

a reconfigurable radiation desensitivity bracket coupled to the groundplane.

20. The portable device of claim 19 wherein the electrical circuit is selected from the group including components mounted on a printed circuit board (PCB), a display, a connector, and a keypad.

21. The portable device of claim 19 wherein the bracket includes a selectable electrical length section having a distal end, a proximal end, a control input to accept control signals, and a selectable effective electrical length responsive to the control signals.

22. The portable device of claim 21 wherein the bracket further includes a fixed electrical length section having a distal end, a proximal end, and a fixed physical length;

and,

wherein the combination of the selectable electrical length section and the fixed electrical length section provides a combined selectable effective electrical length responsive to the control signal.

23. A wireless communications base station with a reconfigurable radiation desensitivity bracket, the base station comprising:

a base station telephone transceiver;

an antenna connected to the transceiver;

an electrical circuit having a groundplane; and

,

a reconfigurable radiation desensitivity bracket coupled to the groundplane.

24. The base station of claim 23 wherein the bracket includes a selectable electrical length section having a distal end, a proximal end, a control input to accept control signals, and a selectable effective electrical length responsive to the control signals.

25. The base station of claim 24 wherein the bracket further includes a fixed electrical length section having a distal end, a proximal end, and a fixed physical length;

and,

wherein the combination of the selectable electrical length section and the fixed electrical length section provides a combined selectable effective electrical length responsive to the control signal.

26. In a wireless communications device, a method for reconfigurable radiation desensitivity, the method comprising:

generating a radiated wave at a first frequency;

in response to generating the radiated wave at the first frequency, creating a maximum current per units square (I/units²) through a minimal area of an electrical circuit groundplane;

generating a radiated wave at a second frequency;

in response to generating the radiated wave at the second frequency, maintaining the maximum I/units² through the minimal area of the groundplane.

27. The method of claim 26 wherein maintaining the maximum I/units² through the minimal area of the groundplane includes creating the maximum I/units² through the groundplane of an electrical circuit selected from the group including components mounted on a printed circuit board (PCB), a display, a connector, and a keypad.

28. The method of claim 26 wherein maintaining the maximum I/units² through the minimal area of the groundplane includes coupling the groundplane to a bracket having a selectable effective electrical length.

29. The method of claim 28 wherein coupling the groundplane to a bracket having a selectable effective electrical length includes coupling the groundplane to a bracket with a fixed physical length section to provide a combined effective electrical length responsive to the fixed physical length and the selectable effective electrical length.

30. The method of claim 28 wherein coupling the groundplane to a bracket having a selectable effective electrical length includes coupling the groundplane to a bracket with a plurality of selectable electrical length sections.

31. The method of claim 30 wherein coupling the groundplane to a bracket with a plurality of selectable electrical length sections includes connecting the plurality of selectable electrical length sections in a configuration selected from the group including connected to the groundplane, series-connected, parallel-connected, and combinations of the above-mentioned connection configurations.

32. The method of claim 30 wherein coupling the groundplane to a bracket having a selectable effective electrical length includes coupling the groundplane to a bracket with a plurality of fixed physical length sections.

33. The method of claim 32 wherein coupling the groundplane to a bracket with a plurality of fixed physical length sections includes connecting the plurality of fixed electrical length sections to a selectable electrical length section in a configuration selected from the group including connected to the groundplane, series-connected, parallel-connected, and combinations of the above-mentioned connection configurations.

34. The method of claim 28 wherein includes coupling the groundplane to a bracket having a selectable effective electrical length includes coupling through a mechanism selected from the group including transistor coupling, p/n junction coupling, selectable capacitive coupling, variable gap coupling, and mechanically bridging.