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US 12,592,723 B2Granted
Duplexer, multiplexer and multiband filter
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsChunyun Jian, Mi Zhou
Life of this patent
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Abstract
Methods and apparatuses are provided for a matched band pass filter utilized in a duplexer or multiplexer. In one embodiment, the matched band pass filter includes a filter part and a port-matching part that is coupled to and in signal communication with the filter part. The filter part is configured to filter an RF signal and includes an input port. The port-matching part includes an output port. The port-matching part is configured to provide impedance matching through the output port.
Claims18
A duplexer comprising:
- i) a transmit single-port-matched band pass filter (TX SPMBPF) comprising:
- ia) a transmit (TX) main part, the TX main part comprising a TX first port in signal communication with a transmit port, the TX first port configured to receive a transmit radio frequency (RF) signal from the transmit port, the TX main part configured to filter the transmit RF signal;
- and
- ib) a TX port-matching part coupled to and in signal communication with the TX main part, the TX port-matching part including an TX second port, the TX second port is used as an antenna port of the duplexer and in signal communication with an antenna;
- ii) an RF transmission line component connected to the TX second port;
- and
- iii) a receive single-port-matched band pass filter (RX SPMBPF) comprising:
- iiia) a receive (RX) main part, the RX main part comprising an RX first port in signal communication with a receive port;
- and
- iiib) an RX port-matching part coupled to and in signal communication with the RX main part, the RX port-matching part including an RX second port connected to the RF transmission line component providing signal communication to the antenna port, the RX port-matching part being configured to receive an RF signal from the antenna port, wherein
- the RX main part is configured to filter the received RF signal and provide the filtered received RF signal to the receive port through the RX first port,
- the TX port-matching part configured to provide impedance matching in its RX band to match the connected RX SPMBPF and the antenna at the antenna port, and
- the RX port-matching part configured to provide impedance matching in its TX band to match the connected TX SPMBPF and the antenna at the antenna port.
10 more elements
A multiplexer comprising:
- i) one or more transmit single-port-matched band pass filters (TX SPMBPFs), each TX SPMBPF comprising:
- ia) a transmit (TX) main part, the TX main part including a TX first port in signal communication with a transmit port, the TX first port configured to receive a transmit radio frequency (RF) signal from the transmit port, the TX main part configured to filter the transmit RF signal;
- and
- ib) a TX port-matching part, the TX port-matching part coupled to and in signal communication with the TX main part, the TX port-matching part including an TX second port being configured in signal communication with an antenna, wherein one of the TX second ports of the one or more TX SPMBPFs is set as an antenna port;
- ii) a plurality of RF transmission line components connected to the TX second ports;
- and
- iii) one or more receive single-port-matched band pass filters (RX SPMBPFs), each RX SPMBPF comprising:
- iiia) a receive (RX) main part, the RX main part including an RX first port in signal communication with a receive port;
- and
- iiib) an RX port-matching part, the RX port-matching part coupled to and in signal communication with the RX main part, the RX port-matching part including an RX second port, the RX second port connected to at least one of the plurality of RF transmission line components and providing signal communication to the antenna port, the RX port-matching part configured to receive an RF signal from the antenna port, wherein
- the RX main part configured to filter the received RF signal and provide the filtered received RF signal to the receive port through the RX first port, the RX port-matching part configured to provide impedance matching in all pass bands of its connected TX SPMBPFs and other RX SPMBPFs to match all the connected TX and other RX SPMBPFs and the antenna at the antenna port, and
- each of the TX port-matching parts configured to provide impedance matching in all pass bands of its connected other TX SPMBPFs and RX SPMBPFs to match all the connected other TX SPMBPFs and RX SPMBPFs and the antenna at the antenna port.
9 more elements
Dependencies are inferred from the claim text.