# US 10,873,348 B2 · Antenna system for a portable communication device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,348 B2 - Document ID: US10873348B2 - Status: Granted - Kind: B2 - Application number: 16/393,890 - Filed: 2019-04-24 - Published: 2020-10-29 - Granted: 2020-12-22 - Earliest claimed: 2019-04-24 - Assignees: Motorola Solutions, Inc. - Applicants: Motorola Solutions, Inc - Inventors: Antonio Faraone; Giorgi Bit-Babik - Web page: https://patentgrep.com/patent/US10873348B2 ## CPC - H04B 1/0064: {with separate antennas for the more than one band (H04B1/0053 takes precedence)} - H04B 15/04: the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder - H01Q 1/241: {used in mobile communications, e.g. GSM (H01Q1/247, H01Q1/248 take precedence)} - H01Q 1/521: {reducing the coupling between adjacent antennas} - H04B 1/18: Input circuits, e.g. for coupling to an antenna or a transmission line (coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H) - H04B 1/3827: Portable transceivers - H04B 1/40: Circuits - H04B: TRANSMISSION - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract An antenna system for a portable wireless communication device is provided having a first antenna and a second antenna, the first and second antennas being proximally located causing electromagnetic coupling therebetween. An isolator is coupled with the first and second antennas and the first and second RF transceivers at respective interface ports. The isolator Comprises a radio frequency (RF) coupler featuring four RF coupler ports. The four RF coupler ports are coupled to respective phasor-shaping networks at each of the four RF coupler ports. The first and second RF transceivers operate independently in respective frequency bands. ## Claims ### Claim 1 An antenna system for a portable wireless communication device, comprising: a first antenna; a second antenna, the first and second antennas being proximally located causing electromagnetic coupling therebetween; a first RF transceiver; a second RF transceiver; an isolator coupled with said first and second antennas and said first and second RF transceivers at respective interface ports, said isolator comprising: a radio frequency (RF) coupler featuring four RF coupler ports forming two pairs of RF coupler ports, each pair residing at opposite ends of the RF coupler; a pair of coupled RF transmission lines connected between each pair of RF coupler ports; the first RF transceiver being connected to a first end of a first coupled RF transmission line at a first RF coupler port of the first pair of RF ports; the first antenna being connected to a second end of the first coupled RF transmission line at a first RF coupler port of the second pair of RF ports; the second RF transceiver being connected to a second end of the second coupled RF transmission line at a second RF coupler port of the second pair of RF ports; the second antenna being connected to a first end of the second coupled RF transmission line at a second RF coupler port of the first pair of RF ports; said four RF coupler ports being coupled to respective phasor-shaping networks at each of the four RF coupler ports; both the first and second antennas receiving RF signals from each one of the first and second RF transceivers; both the first and second RF transceivers receiving RF signals from each one of the first and second antennas; and wherein the first and second RF transceivers operate independently in respective frequency bands. ### Claim 2 (depends on 1) The antenna system of claim 1, wherein said phasor-shaping networks comprise at least one of: a phasor-shaping circuit, a radio frequency (RF) transmission line, a radio frequency (RF) switch. ### Claim 3 (depends on 1) The antenna system of claim 1, wherein said phasor-shaping networks comprise at least one of: a plurality of phasor-shaping circuits cascaded to effect a phasor shaping function; a plurality of radio frequency (RF) transmission lines cascaded to effect a phasor shaping function; and a plurality of RF switches cascaded to effect a phasor shaping function. ### Claim 4 (depends on 3) The antenna system of claim 3, wherein the phasor-shaping function dynamically optimizes the isolator for performance is specific current bands of operation of the first and second RF transceivers. ### Claim 5 (depends on 1) The antenna system of claim 1, wherein said phasor-shaping networks comprises: a radio frequency (RF) switch that routes RF signals to a global communication accessory interface (GCAI) connector of the portable wireless communication device. ### Claim 6 (depends on 1) The antenna system of claim 1, wherein said phasor-shaping networks comprise reconfigurable radio frequency (RF) components altering a phasor-shaping function. ### Claim 7 (depends on 1) The antenna system of claim 1, wherein said respective frequency bands overlap. ### Claim 8 (depends on 1) The antenna system of claim 1, wherein said RF coupler comprises radio frequency (RF) switches that synchronously operate to effect predetermined changes in RF scattering parameters of said RF coupler. ### Claim 9 (depends on 8) The antenna system of claim 8, wherein said predetermined changes in RF scattering parameters are dynamically effected by a controller hosted in the portable wireless communication device in response to at least one of: band of operation; currently engaged communication protocol; device-hosted sensor information; user input; LTE and LMR infrastructure network inputs; and type and state of device accessories engaged with the portable wireless communication device. ### Claim 10 A portable communication device, comprising: a first antenna; a second antenna, the first and second antennas being proximally located causing electromagnetic coupling therebetween; a first RF transceiver; a second RF transceiver; an isolator coupled with said first and second antennas and said first and second RF transceivers, said isolator comprising: a radio frequency (RF) coupler featuring four RF coupler ports, forming two pairs of RF coupler ports, each pair residing at opposite ends of the RF coupler; a pair of coupled RF transmission lines connected between each pair of RF coupler ports; the first RF transceiver being connected to a first end of a first coupled RF transmission line at a first RF coupler port of the first pair of RF ports; the first antenna being connected to a second end of the first coupled RF transmission line at a first RF coupler port of the second pair of RF ports; the second RF transceiver being connected to a second end of the second coupled RF transmission line at a second RF coupler port of the second pair of RF ports; the second antenna being connected to a first end of the second coupled RF transmission line at a second RF coupler port of the first pair of RF ports; said four RF coupler ports being coupled to respective phasor-shaping networks at each of the four RF coupler ports; both the first and second antennas receiving RF signals from each one of the first and second RF transceivers; both the first and second RF transceivers receiving RF signals from each one of the first and second antennas; and wherein the first and second RF transceivers operate independently in respective frequency bands. ### Claim 11 (depends on 10) The portable communication device of claim 10, wherein the first antenna comprises a land mobile radio (LMR) antenna, and the second antenna comprises a long term evolutions (LTE) antenna. ### Claim 12 (depends on 10) The portable communication device of claim 10, wherein the first antenna is located on a top surface of the portable communication device, and the second antenna is located internally within a bottom portion of the portable communication device. ### Claim 13 (depends on 10) The portable communication device of claim 10, wherein said phasor-shaping networks comprise at least one of: a phasor-shaping circuit, a radio frequency (RF) transmission line, a radio frequency (RF) switch. ### Claim 14 (depends on 10) The portable communication device of claim 10, wherein said phasor-shaping networks comprise at least one of: a plurality of phasor-shaping circuits cascaded to effect a phasor shaping function; a plurality of radio frequency (RF) transmission lines cascaded to effect a phasor shaping function; and a plurality of RF switches cascaded to effect a phasor shaping function. ### Claim 15 (depends on 10) The portable communication device of claim 10, wherein said phasor-shaping networks comprise reconfigurable radio frequency (RF) components altering a phasor-shaping function. ### Claim 16 (depends on 10) The portable communication device of claim 10, wherein said respective frequency bands overlap. ### Claim 17 (depends on 10) The portable communication device of claim 10, wherein said RF coupler comprises radio frequency (RF) switches that synchronously operate to effect predetermined changes in RF scattering parameters of said RF coupler. ### Claim 18 (depends on 10) The portable communication device of claim 10, further comprising: a global communication accessory interface (GCAI) connector; and the first RF transceiver and second RF transceiver being further operatively coupled to the GCAI connector.