# US 8,543,053 B1 · Wireless communication jamming using signal delay technology > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,543,053 B1 - Document ID: US8543053B1 - Status: Granted - Kind: B1 - Application number: 13/227,991 - Filed: 2011-09-08 - Granted: 2013-09-24 - Earliest claimed: 2011-06-30 - Applicants: Howard Melamed; Daniel Fitzsimmons - Inventors: Howard Melamed; Daniel Fitzsimmons - Web page: https://patentgrep.com/patent/US8543053B1 ## CPC - H04K 3/43: {characterized by the control of the jamming power, signal-to-noise ratio or geographic coverage area} - H04K 3/41: {characterized by the control of the jamming activation or deactivation time (control of jamming activation and deactivation time only for the purpose of alternating between jamming mode and target monitoring mode H04K3/45)} - H04K 3/45: {characterized by including monitoring of the target or target signal, e.g. in reactive jammers or follower jammers for example by means of an alternation of jamming phases and monitoring phases, called "look-through mode"} - H04K 3/46: {characterized in that the jamming signal is produced by retransmitting a received signal, after delay or processing} - H04K 3/65: {using deceptive jamming or spoofing, e.g. transmission of false signals for premature triggering of RCIED, for forced connection or disconnection to/from a network or for generation of dummy target signal} - H04K 3/42: {characterized by the control of the jamming frequency or wavelength} - H04K 2203/16: for telephony - H04K 2203/32: including a particular configuration of antennas - H04K: SECRET COMMUNICATION; JAMMING OF COMMUNICATION ## Abstract A device and method for jamming wireless communication devices where the jamming signal is derived from the downlink signal of the base station and processed with a time delay sufficient length as to prevent the base station receiver from correctly processing the responding uplink signal from the targeted wireless communications device. Such wireless communication jamming device can be used by law enforcement and authorized government entities to block the operation of wireless communication devices such as cell phones within a target area. ## Claims ### Claim 1 A method of jamming communication of a wireless communication device within a target area, the method comprising: receiving a target signal downlinked from a base station communicating within the target area, delaying the target signal to create a delayed target signal, amplifying the delayed target signal to a predetermined power level greater than the power level of the downlinked target signal as received from the base station, creating a jamming signal by amplifying the delayed target signal to the predetermined power level and sufficiently increasing the predetermined power level to a degree sufficient to induce the wireless communication device to lock onto the jamming signal, and causing the wireless communication device to uplink on a sufficiently delayed basis to be incorrectly processed by the base station. ### Claim 2 (depends on 1) A method as recited in claim 1 comprising receiving the target downlinked signal by receiving antenna facilities located outside the target area. ### Claim 3 (depends on 2) A method as recited in claim 2 comprising including a transmitting antenna facility to communicate the jamming signal to the communication device. ### Claim 4 (depends on 3) A method as recited in claim 3 comprising isolating the receiving antenna facility located outside the target area from the transmitting antenna facility. ### Claim 5 (depends on 1) A method as recited in claim 1 comprising pre-amplifying the power level of the target downlinked signal sufficiently to facilitate the processing of the downlinked signal for delay. ### Claim 6 (depends on 1) A method as recited in claim 1 comprising filtering the downlinked signal to define a frequency band to be jammed. ### Claim 7 (depends on 6) A method as recited in claim 6 comprising filtering the jamming signal to attenuate out band radio frequency emissions. ### Claim 8 (depends on 1) A method as recited in claim 1 comprising filtering the jamming signal to attenuate out band radio frequency emissions. ### Claim 9 (depends on 1) A method as recited in claim 1 further comprising simultaneously receiving target downlinked signals having different frequency bands; separately amplifying the target downlinked signals; creating independent jamming signals by independently amplifying the delayed target signals each to a predetermined power level sufficient to induce the wireless communication device to lock onto the created jamming signals and causing the wireless communication device to uplink on a sufficiently delayed basis to be incorrectly processed by the base station. ### Claim 10 (depends on 9) A method as recited in claim 9 processing the target downlinked signals simultaneously in parallel. ### Claim 11 (depends on 1) A method as recited in claim 1 generating the jamming signal to include a continuous non-distorted signal having a predetermined power level that is sufficiently higher than the original downlinked signal from the base station to induce a target wireless device to lock onto the jamming signal. ### Claim 12 A system for jamming communication of a wireless communication device within a target area, the system comprising: a jamming assembly including at least one jamming circuit comprising a signal delay device, a receiving antenna assembly disposed and structured to receive a downlinked target signal, said signal delay device operative to establish a predetermined delay in communicating the downlinked target signal, said one jamming circuit comprising a power amplifier operative to amplify power level of the downlinked target signal as received by receiving antenna assembly, a transmitting antenna assembly structured to emit jamming signal within the target area, said signal delay device, said power amplifier facility and said transmitting antenna facility collectively operative to create a delayed jamming signal having a sufficient power level to induce the wireless communication device to lock onto the jamming signal. ### Claim 13 (depends on 12) A system as recited in claim 12 wherein said receiving antenna assembly is located outside the target area. ### Claim 14 (depends on 12) A system as recited in claim 12 wherein said receiving antenna assembly and said transmitting antenna assembly are isolated from one another. ### Claim 15 (depends on 12) A system as recited in claim 12 wherein said one jamming circuit further comprises a pre-amplifier facility disposed and structured to amplify the downlinked target signal to a power level sufficient to facilitate processing thereof by the delay device. ### Claim 16 (depends on 12) A system as recited in claim 12 said one jamming circuit further comprising a first band filter facility disposed and structured to restrict and define a frequency band of the target downlinked signal. ### Claim 17 (depends on 16) A system as recited in claim 16 wherein said one jamming circuit comprises a second band filter disposed and structured to attenuate the band radio frequency emissions of the jamming signal. ### Claim 18 (depends on 12) A system as recited in claim 12 wherein said one jamming circuit comprises a second band filter disposed and structured to attenuate the band radio frequency emissions of the jamming signal. ### Claim 19 (depends on 12) A system as recited in claim 12 wherein said jamming assembly comprises a plurality of jamming circuits each including a delay device; said receiving antenna assembly structured to direct downlinked target signals to each of said jamming circuits; each of said delay devices operative to establish a predetermined time delay in communicating corresponding ones of the downlinked target signals; each of said jamming circuits comprising a power amplifier facility operative to amplify the power level of corresponding ones of the target downlinked signals received from the receiving antenna assembly; the delay device and said power amplifier of each said jamming circuits collectively operative to create separate delayed jamming signals having a sufficient power level to induce the wireless communication device to lock onto corresponding jamming signals, and a transmitting antenna assembly structured to emit the jamming signal within the target area. ### Claim 20 (depends on 19) A system as recited in claim 19 wherein said plurality of jamming circuits are structured for simultaneous, parallel operation. ### Claim 21 (depends on 19) A system as recited in claim 19 wherein said receiving antenna assembly is located outside the target area. ### Claim 22 (depends on 19) A system as recited in claim 19 wherein each of said jamming circuits further comprises a pre-amplifier facility disposed and structured to amplify corresponding downlinked target signals to a power level sufficient to facilitate processing thereof by the corresponding delay device. ### Claim 23 (depends on 19) A system as recited in claim 19 wherein each of said jamming circuits includes a first band filter facility disposed and structured to restrict and define a frequency band of the corresponding downlinked target signals. ### Claim 24 (depends on 23) A system as recited in claim 23 wherein each of said jamming circuits includes a second band filter disposed and structured to attenuate the band radio frequency emissions of the corresponding jamming signal. ### Claim 25 (depends on 12) A system as recited in claim 12 wherein said one jamming circuit comprises a second band filter disposed and structured to attenuate the band radio frequency emissions of the jamming signal.