# US 2014/0152385 A1 · Bidirectional matching network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152385 A1 - Document ID: US20140152385A1 - Status: Published application - Kind: A1 - Application number: 13/691,361 - Filed: 2012-11-30 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: QUALCOMM Incorporated - Applicants: Qualcomm Incorporated - Inventors: Danial Ehyaie; Mazhareddin Taghivand - Web page: https://patentgrep.com/patent/US20140152385A1 ## CPC - H03F 1/56: Modifications of input or output impedances, not otherwise provided for - H03F 1/565: {using inductive elements} - 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) - H03F: AMPLIFIERS - H04B: TRANSMISSION ## Abstract A bidirectional matching network is disclosed. In an exemplary embodiment, an apparatus includes a first matching circuit connected in a first signal path between a node and a first amplifier, the first matching circuit configured to translate an off-state impedance of the first amplifier to a first translated off-state impedance. The apparatus also includes a second matching circuit connected in a second signal path between the node and a second amplifier. The second matching circuit configured to translate an off-state impedance of the second amplifier to a second translated off-state impedance. The second translated off-state impedance is configured to reduce power loss associated with a first signal flowing in the first signal path and the first translated off-state impedance is configured to reduce power loss associated with a second signal flowing in the second signal path. ## Claims ### Claim 1 An apparatus comprising: a first matching circuit connected in a first signal path between a node and a first amplifier to translate an off-state impedance of the first amplifier to a first translated off-state impedance; a second matching circuit connected in a second signal path between the node and a second amplifier to translate an off-state impedance of the second amplifier to a second translated off-state impedance; the second translated off-state impedance configured to reduce power loss associated with a first signal flowing in the first signal path; and the first translated off-state impedance configured to reduce power loss associated with a second signal flowing in the second signal path. ### Claim 2 (depends on 1) The apparatus of claim 1, the first matching circuit configured to translate an on-state impedance of the first amplifier to a first translated on-state impedance that combines with the second translated off-state impedance to form a first matching impedance at the node. ### Claim 3 (depends on 2) The apparatus of claim 2, the second matching circuit configured to translate an on-state impedance of the second amplifier to a second translated on-state impedance that combines with the first translated off-state impedance to form a second matching impedance at the node. ### Claim 4 (depends on 3) The apparatus of claim 3, the first and second matching impedances matched to 50 ohms. ### Claim 5 (depends on 1) The apparatus of claim 1, the first and second signals comprise receive and transmit signals, respectively, that have substantially identical frequencies. ### Claim 6 (depends on 1) The apparatus of claim 1, the first matching circuit comprising a capacitor and an inductor. ### Claim 7 (depends on 1) The apparatus of claim 1, the second matching circuit comprising two inductors. ### Claim 8 (depends on 1) The apparatus of claim 1, the first amplifier comprising a low noise amplifier (LNA). ### Claim 9 (depends on 1) The apparatus of claim 1, the second amplifier comprising a power amplifier (PA). ### Claim 10 (depends on 1) The apparatus of claim 1, the apparatus configured for use in a transceiver to couple an antenna to the first and second amplifiers using the node. ### Claim 11 (depends on 1) The apparatus of claim 1, the apparatus configured for use in a transceiver to couple the first and second amplifiers to a phase shifter. ### Claim 12 (depends on 1) The apparatus of claim 1, the apparatus configured for use in a transceiver to couple a power divider/combiner to first and second mixers. ### Claim 13 (depends on 1) The apparatus of claim 1, the apparatus configured to provide switchless concurrent matching to an antenna coupled to the node to receive and transmit signals at millimeter wave frequencies. ### Claim 14 An apparatus comprising: means for matching to a first device on a first signal path to translate an off-state impedance of the first device to a first translated off-state impedance that is configured to reduce power loss associated with a second signal flowing in a second signal path that is coupled to the first signal path at a node; and means for matching to a second device on the second signal path to translate an off-state impedance of the second device to a second translated off-state impedance that is configured to reduce power loss associated with a first signal flowing in the first signal path. ### Claim 15 (depends on 14) The apparatus of claim 14, the means for matching to the first device further configured to translate an on-state impedance of the first device to a first translated on-state impedance that combines with the second translated off-state impedance to form a first matching impedance at the node. ### Claim 16 (depends on 15) The apparatus of claim 15, the means for matching to the second device further configured to translate an on-state impedance of the second device to a second translated on-state impedance that combines with the first translated off-state impedance to form a second matching impedance at the node. ### Claim 17 (depends on 16) The apparatus of claim 16, the first and second matching impedances matched to 50 ohms. ### Claim 18 (depends on 14) The apparatus of claim 14, the first and second signals have substantially identical frequencies. ### Claim 19 (depends on 14) The apparatus of claim 14, the first device comprises a low noise amplifier (LNA), the second device comprises a power amplifier (PA), and the apparatus is further configured for use in a transceiver to couple an antenna to the LNA and PA using the node. ### Claim 20 (depends on 19) The apparatus of claim 19, the apparatus configured to provide switchless concurrent matching to the antenna to receive and transmit signals at millimeter wave frequencies.