公开(公告)号：US20190181837A1

公开(公告)日：2019-06-13

申请号：US16210670

申请日：2018-12-05

Applicant: Infineon Technologies AG

Inventor： Stefan Helmut Schmalzl ,  Peter Pfann ,  Ruediger Bauder ,  Hans-Joerg Timme

IPC: H03H9/66 ,  H03H9/48 ,  H03H9/00 ,  H04B1/00 ,  H04B1/50 ,  H04B1/04 ,  H03H7/01

Abstract: In accordance with an embodiment, an RF system includes a transmit path having a transmit RF filter and an adjustable transmit phase shifter/matching network coupled between the transmit RF filter and a transmit antenna port, where the adjustable transmit phase shifter/matching network is configured to transform an impedance of the transmit RF filter at a receive frequency from a first lower impedance to a first higher impedance at the transmit antenna port; and a receive path having a receive RF filter and an adjustable receive phase shifter/matching network coupled between the receive RF filter and a receive antenna port, where the adjustable receive phase shifter/matching network is configured to transform an impedance of the receive RF filter at a transmit frequency from a second lower impedance to a second higher impedance at the receive antenna port.

公开(公告)号：US20190181832A1

公开(公告)日：2019-06-13

申请号：US16210610

申请日：2018-12-05

Applicant: Infineon Technologies AG

Inventor： Stefan Helmut Schmalzl ,  Peter Pfann ,  Ruediger Bauder ,  Hans-Joerg Timme

IPC: H03H9/54 ,  H03H7/01 ,  H03F3/19 ,  H03F3/21 ,  H03H9/70 ,  H03H7/46 ,  H04B1/18 ,  H04B1/10

Abstract: In accordance with an embodiment, a method of operating an RF system includes filtering a wideband RF signal using an adjustable center frequency bandpass filter to produce a filtered RF signal; amplifying the filtered RF signal to produce an amplified RF signal; and band stop filtering the amplified RF signal to produce a band stopped RF signal.

公开(公告)号：US20190181825A1

公开(公告)日：2019-06-13

申请号：US16210637

申请日：2018-12-05

Applicant: Infineon Technologies AG

Inventor： Stefan Helmut Schmalzl ,  Peter Pfann ,  Ruediger Bauder ,  Hans-Joerg Timme

IPC: H03H7/12 ,  H03H7/46 ,  H03H7/01 ,  H04B1/00 ,  H04B1/525

Abstract: In accordance with an embodiment, an RF system includes a transmit path having a first tunable transmit band stop filter, and a power amplifier coupled to an output of the first tunable transmit band stop filter, where the first tunable transmit band stop filter is configured reject a receive frequency and pass a transmit frequency; a receive path comprising an LNA; and a duplex filter having a transmit path port coupled to an output of the power amplifier, a receive path port coupled to an input of the LNA, and an antenna port, where the duplex filter is configured to pass the transmit frequency and reject the receive frequency between the antenna port and the transmit path port, pass the receive frequency and reject the transmit frequency between the antenna port and the receive path port.