# US 7,746,292 B2 · Reconfigurable radiation desensitivity bracket systems and methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,746,292 B2 - Document ID: US7746292B2 - Status: Granted - Kind: B2 - Application number: 10/940,206 - Filed: 2004-09-14 - Published: 2005-03-17 - Granted: 2010-06-29 - Earliest claimed: 2001-04-11 - Assignees: Kyocera Wireless Corp. - Inventors: Gregory Poilasne; Jorge Fabrega-Sanchez - Web page: https://patentgrep.com/patent/US7746292B2 ## CPC - H01G 7/06: having a dielectric selected for the variation of its permittivity with applied voltage, i.e. ferroelectric capacitors (electrets H01G7/02) - H01P 1/203: Strip line filters - H01P 1/20336: {Comb or interdigital filters} - H01P 1/213: combining or separating two or more different frequencies (H01P1/215 takes precedence) - H01P 5/04: with variable factor of coupling - H01Q 1/00: Details of, or arrangements associated with, antennas (arrangements for varying orientation of directional pattern H01Q3/00) - H01Q 1/241: {used in mobile communications, e.g. GSM (H01Q1/247, H01Q1/248 take precedence)} - H01Q 1/243: {with built-in antennas} - H01Q 1/48: Earthing means; Earth screens; Counterpoises - H01Q 1/52: Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure (absorbing means H01Q17/00) - H01Q 3/44: varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element - H01Q 9/0407: {Substantially flat resonant element parallel to ground plane, e.g. patch antenna (dipole H01Q9/285; monopole H01Q9/40)} - H01Q 9/0421: {with a shorting wall or a shorting pin at one end of the element (H01Q9/0414 takes precedence)} - H01Q 9/0442: {with particular tuning means} - H01Q 9/16: with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole (H01Q9/44 takes precedence) - 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) - H01Q 9/30: with feed to end of elongated active element, e.g. unipole (H01Q9/44 takes precedence) - H01Q 13/02: Waveguide horns - H01Q 13/06: Waveguide mouths (horns H01Q13/02) - H01Q 13/203: {Leaky coaxial lines} - H03B 5/1841: {the frequency-determining element being a strip line resonator (H03B5/1805, H03B5/1817, H03B5/1864 and H03B5/1882 take precedence)} - H03B 5/362: {the amplifier being a single transistor (H03B5/364 - H03B5/368 take precedence)} - H03F 1/56: Modifications of input or output impedances, not otherwise provided for - H03F 3/191: Tuned amplifiers (H03F3/193, H03F3/195 take precedence) - H03H 7/20: Two-port phase shifters providing an adjustable phase shift - H03J 5/246: {using electronic means (H03J5/244 takes precedence)} - 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)} - H03L 7/18: using a frequency divider or counter in the loop (H03L7/20, H03L7/22 take precedence) - H04B 1/30: for homodyne or synchrodyne receivers (demodulator circuits H03D1/22) - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) - H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B) - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - H03B: GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS (generators adapted for electrophonic musical instruments G10H; masers or lasers H01S; generation of oscillations in plasma H05H) - H03F: AMPLIFIERS - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) - H03J: TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS - H03L: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (generation of oscillations H03B) - H04B: TRANSMISSION ## Abstract A method and device bracket are presented for reconfigurable radiation desensitivity. The method includes: accepting a radiated wave from a source such as a transmitter, antenna, microprocessor, electrical component, integrated circuit, camera, connector, or signal cable; in response to the radiated wave, creating a first current per units square (I/units2) through a groundplane of an electrical circuit such as a printed circuit board (PCB), display, connector, or keypad; accepting a control signal; and, in response to the control signal, creating a second I/units2 through the groundplane. This step couples the groundplane to a bracket having a selectable effective electrical length. Typically, the groundplane is coupled 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. The coupling mechanism can result from transistor coupling, p/n junction coupling, selectable capacitive coupling, or mechanically bridging. ## Claims ### Claim 1 A device for reducing the effects of radiation-induced currents on electrical circuitry, comprising: an electrical circuit comprising a groundplane; and, a radiation source generating undesirable, radiation-induced groundplane currents in at least one area of the groundplane; a radiation-parasitic bracket coupled to the groundplane for modifying current flow patterns of the undesirable, radiation-induced groundplane currents to produce distributed groundplane currents, the bracket comprising: a conductive element connected to the groundplane, the conductive element having a fixed physical length and a selectable effective electrical length. ### Claim 2 (depends on 1) The device of claim 1 wherein the electrical circuit is selected from the group including components mounted on a printed circuit board (PCB), display, connector, and keypad. ### Claim 3 (depends on 1) The device of claim 1 wherein the radiation source is selected from the group including a transmitter, antenna, microprocessor, electrical component, camera, connector, signal cable, and integrated circuit. ### Claim 4 (depends on 1) The device of claim 1 wherein the bracket further comprises a control input connected to the conductive element to accept control signals, wherein the selectable effective electrical length of the conductive element is responsive to the control signals. ### Claim 5 (depends on 4) The device of claim 4 wherein the conductive element comprises a fixed electrical length section and selectable electrical length section. ### Claim 6 (depends on 5) The device of claim 5 wherein the conductive element comprises a plurality of selectable electrical length sections that are connected in a configuration selected from the group including groundplane-connected, series-connected, and parallel-connected. ### Claim 7 (depends on 5) The device of claim 5 wherein the bracket includes a plurality of fixed electrical length sections. ### Claim 8 (depends on 7) The device of claim 7 wherein the plurality of fixed electrical length sections are connected to the selectable electrical length section in a configuration selected from the group including groundplane-connected, series-connected, and parallel-connected. ### Claim 9 (depends on 5) The device of claim 5 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. ### Claim 10 (depends on 5) The device of claim 5 wherein the fixed electrical length section is an element selected from the group including a wire, fastener, conductive trace, conductive paint, and a member formed straight, L-shaped, O-shaped, and combinations of the above-mentioned forms. ### Claim 11 (depends on 5) The device of claim 5 wherein the bracket includes: a chassis surrounding the electrical circuit; wherein the fixed electrical length section is formed as a conductive trace on the chassis; and, wherein the selectable electrical length section couples the chassis-mounted fixed electrical length section to the groundplane. ### Claim 12 (depends on 4) The device of claim 4 wherein the conductive element includes: a plurality of fixed electrical length sections formed as a matrix of adjoining conductive areas; and a plurality of selectable electrical length sections couple between fixed electrical length sections; wherein at least one of the plurality of selectable electrical length sections is coupled to the groundplane. ### Claim 13 (depends on 4) 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 control input of the bracket. ### Claim 14 (depends on 1) The device of claim 1 wherein the bracket includes a plurality of conductive elements having at least one selectable electrical length section. ### Claim 15 A bracket for distributing groundplane currents, comprising: a conductive element connected to a groundplane, the conductive element comprising at least one fixed electrical length section and at least one selectable electrical length section; and a control input connected to the at least one selectable electrical length section, wherein an effective electrical length of the at least one selectable electrical length section is responsive to control signals input on the control input; wherein an effective electrical length of the bracket is based on the combination of effective electrical lengths of the fixed electrical length section and the at least one selectable electrical length section, and the bracket modifies current flow patterns of undesirable, radiation-induced groundplane currents generated by a radiation source to produce distributed groundplane currents. ### Claim 16 (depends on 15) The bracket of claim 15, wherein the conductive element is a plurality of conductive elements. ### Claim 17 (depends on 15) The bracket of claim 15, wherein the at least one fixed electrical length section and the at least one selectable electrical length section are arranged in a parallel configuration. ### Claim 18 (depends on 15) The bracket of claim 15, wherein the at least one fixed electrical length section and the at least one selectable electrical length section are arranged in a series configuration. ### Claim 19 A device comprising: an electrical circuit comprising a groundplane; and a conductive radiation-parasitic bracket connected to the groundplane and configured to distribute radiation-induced current flow patterns on the groundplane into one or more predetermined patterns in accordance with a control signal, the conductive radiation-parasitic bracket comprising a fixed electrical length section and a selectable electrical length section responsive to the control signal.