# US 2014/0194074 A1 · Method and apparatus for wireless communicationdevice multiband tunable radio architecture > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0194074 A1 - Document ID: US20140194074A1 - Status: Published application - Kind: A1 - Application number: 13/735,560 - Filed: 2013-01-07 - Published: 2014-07-10 - Earliest claimed: 2013-01-07 - Assignees: Motorola Mobility LLC - Applicants: Motorola Mobility LLC - Inventors: Armin W. Klomsdorf; Gregory R. Black; Richard E. Mach; Dale G. Schwent - Web page: https://patentgrep.com/patent/US20140194074A1 ## CPC - H04B 1/005: {adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges} - H04B 1/0458: {Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages (matching circuits in general H03H)} - 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 1/525: with means for reducing leakage of transmitter signal into the receiver - H04B 1/0064: {with separate antennas for the more than one band (H04B1/0053 takes precedence)} - H04B 1/1036: {with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters (H04B1/123 takes precedence; filter circuits H03H)} - H04B 1/109: {by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input} - H04B: TRANSMISSION ## Abstract A method and apparatus provide a wireless communication device multiband tunable radio architecture. The apparatus can include a multiband transceiver configured to transmit and receive wireless communication signals. The apparatus can include a tunable transmit notch filter coupled to the multiband transceiver. The tunable transmit notch filter can provide low insertion loss in a transmit band and attenuation at a receive frequency. The apparatus can include a tunable circulator coupled to the tunable transmit notch filter. The tunable circulator can provide transmit to receive isolation. The apparatus can include a tunable receive filter coupled to the multiband transceiver. The tunable receive filter can provide low insertion loss at a receive frequency and attenuation at other frequencies. ## Claims ### Claim 1 An apparatus comprising: a multiband transceiver configured to transmit and receive wireless communication signals; a tunable transmit notch filter coupled to the multiband transceiver, the tunable transmit notch filter providing low insertion loss in a transmit band and attenuation at a receive frequency; a tunable circulator coupled to the tunable transmit notch filter, the tunable circulator providing transmit to receive isolation; and a tunable receive filter coupled to the multiband transceiver, the tunable receive filter providing low insertion loss at a receive frequency and attenuation at other frequencies. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the tunable circulator provides transmit signals from the multiband transceiver via the tunable transmit notch filter to an antenna and provides received signals from the antenna to the multiband transceiver via the tunable receive filter. ### Claim 3 (depends on 1) The apparatus according to claim 1, wherein the tunable circulator comprises: a circulator providing transmit to receive isolation; and tunable antenna impedance match circuitry coupled to the circulator and coupled to an antenna, the tunable antenna impedance match circuitry providing transmit and receive band return loss to the circulator. ### Claim 4 (depends on 1) The apparatus according to claim 1, wherein the tunable receive filter comprises: a first tunable receive notch filter coupled to the multiband transceiver, the first tunable receive notch filter providing low insertion loss in a receive band and attenuation at a transmit frequency; and a second tunable receive notch filter coupled to the multiband transceiver, the second tunable receive notch filter providing low insertion loss in a receive band and attenuation at an image frequency. ### Claim 5 (depends on 4) The apparatus according to claim 4, wherein the second tunable receive notch filter provides low insertion loss in the receive band and provides attenuation at a duplex image frequency. ### Claim 6 (depends on 4) The apparatus according to claim 4, wherein the second tunable receive notch filter provides low insertion loss in the receive band and provides attenuation at a half-duplex image frequency. ### Claim 7 (depends on 1) The apparatus according to claim 1, wherein the multiband transceiver comprises a multiband multimode radio frequency transceiver including a wideband transmit port coupled to the tunable transmit notch filter and a wideband receive port coupled to the tunable receive filter. ### Claim 8 (depends on 1) The apparatus according to claim 1, wherein the tunable circulator comprises a multiple port device with at least three ports and with properties of directivity, where a signal entering one port is coupled more strongly to a next port in rotation than to another port. ### Claim 9 (depends on 1) The apparatus according to claim 1, wherein the tunable circulator comprises: a first port that receives a transmit signal; a second port coupled to an antenna, the second port having a second port impedance and the antenna having an antenna impedance; and a third port that sends a receive signal, and wherein the second port impedance is tunably matched to the antenna impedance to reduce signals flowing from the first port to the third port and to reduce signals flowing from the second port to the first port. ### Claim 10 (depends on 9) The apparatus according to claim 9, wherein the tunable circulator comprises tunable antenna impedance match circuitry coupled to the second port and coupled to the antenna, where the tunable antenna impedance match circuitry tunably matches the second port impedance to the antenna impedance. ### Claim 11 (depends on 1) The apparatus according to claim 1, further comprising: a first antenna coupled to the tunable circulator, the first antenna configured to operate at a first carrier frequency; a second antenna coupled to the tunable circulator, the second antenna configured to operate at a second carrier frequency; and a diplexing circuit coupled between the first antenna and the tunable circulator and coupled between the second antenna and the tunable circulator, wherein the tunable circulator is configured to operate at both the first carrier frequency and the second carrier frequency. ### Claim 12 (depends on 1) The apparatus according to claim 1, wherein the tunable circulator comprises: a first port that receives a transmit signal from the tunable transmit notch filter; a second port that receives a receive signal from an antenna; and a third port that sends the receive signal to the tunable receive filter, and wherein the apparatus comprises a feed forward cancelation circuit coupled between the tunable circulator first port and the tunable circulator third port, where the feed forward cancelation circuit cancels transmitted signals from received signals. ### Claim 13 (depends on 1) The apparatus according to claim 1, wherein the multiband transceiver includes a transmit port coupled to the tunable transmit notch filter and a receive port coupled to the tunable receive filter, wherein the apparatus comprises a cancelation loop coupled to the multiband transceiver transmit port and the multiband transceiver receive port, where the cancelation loop automatically determines an amplitude and phase of a canceling signal that cancels transmitted signals from received signals. ### Claim 14 A method comprising: transmitting wireless communication signals from a multiband transceiver; receiving wireless communication signals for the multiband transceiver; providing low insertion loss in a transmit band and attenuation at a receive frequency using a tunable transmit notch filter coupled to the multiband transceiver; providing transmit to receive isolation using a tunable circulator coupled to the tunable transmit notch filter; and providing low insertion loss at a receive frequency and attenuation at other frequencies using a tunable receive filter coupled to the multiband transceiver. ### Claim 15 (depends on 14) The method according to claim 14, wherein the tunable circulator provides transmit signals from the multiband transceiver via the tunable transmit notch filter to an antenna and provides received signals from the antenna to the multiband transceiver via the tunable receive filter. ### Claim 16 (depends on 14) The method according to claim 14, wherein the tunable circulator comprises: a circulator providing transmit to receive isolation; and tunable antenna impedance match circuitry coupled to the circulator and coupled to an antenna, the tunable antenna impedance match circuitry providing transmit and receive band return loss to the circulator. ### Claim 17 (depends on 14) The method according to claim 14, wherein the tunable receive filter comprises: a first tunable receive notch filter coupled to the multiband transceiver, the first tunable receive notch filter providing low insertion loss in a receive band and attenuation at a transmit frequency; and a second tunable receive notch filter coupled to the multiband transceiver, the second tunable receive notch filter providing low insertion loss in a receive band and attenuation at an image frequency. ### Claim 18 (depends on 14) The method according to claim 14, further comprising canceling transmitted signals from received signals using a cancelation circuit coupled between a multiband transceiver transmit port and a multiband transceiver receive port. ### Claim 19 (depends on 14) The method according to claim 14, wherein the tunable receive filter comprises: a first tunable receive notch filter coupled to the multiband transceiver, the first tunable receive notch filter providing low insertion loss in a receive band and attenuation at a transmit frequency; and a second tunable receive notch filter coupled to the multiband transceiver, the second tunable receive notch filter providing low insertion loss in a receive band and attenuation at an image frequency. ### Claim 20 A wireless communication device comprising: a multiband transceiver configured to transmit and receive wireless communication signals; a tunable transmit notch filter coupled to the multiband transceiver, the tunable transmit notch filter providing low insertion loss in a transmit band and attenuation at a receive frequency; a tunable circulator coupled to the tunable transmit notch filter, the tunable circulator providing transmit to receive isolation, the tunable circulator providing transmit signals from the multiband transceiver to an antenna via the tunable transmit notch filter; and a tunable receive filter coupled to the multiband transceiver, the tunable receive filter providing low insertion loss at a receive frequency and attenuation at other frequencies, wherein the tunable circulator provides receive signals from the antenna to the multiband transceiver via the tunable receive filter.