Electrical filter topology
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsGöran Syngg, Daniel Sjöberg
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Abstract
The present disclosure relates to an electrical filter arrangement including a transmitter port, a receiver port and an antenna port. The electrical filter arrangement further includes a transmitter filter connected to the first transmitter port and a receiver filter connected to the receiver port. The electrical filter arrangement further includes a four-port circulator device that is connected between the filters, the antenna port, and a termination impedance that is connected to ground. The circulator device is adapted to admit signals to pass from the transmitter filter to the antenna port, from the antenna port to the receiver filter, and from the receiver filter to the termination impedance.
Claims10
A total electrical filter arrangement that comprises two or more electrical filter arrangements comprising:
- a first electrical filter arrangement comprising:
- a first transmitter port, a first receiver port a first antenna port, and a first transmitter filter connected to the first transmitter port, a first receiver filter connected to the first receiver port, and a first four-port circulator device that is connected between the first transmitter filter and the first receiver filter, the first antenna port, and a first termination impedance that is connected to a first ground,
- wherein the first four-port circulator device is adapted to admit signals to pass i) from the first transmitter filter to the first antenna port, ii) from the first antenna port to the first receiver filter, and iii) from the first receiver filter to the first termination impedance;
- and
- a second electrical filter arrangement comprising:
- a second transmitter port, a second receiver port and a second antenna port, a second transmitter filter connected to the second transmitter port and a second receiver filter connected to the second receiver port, a second four-port circulator device that is connected between the second transmitter filter and the second receiver filter, the second antenna port, and a second termination impedance that is connected to a second ground,
- wherein the second four-port circulator device is adapted to admit signals to pass i) from the second transmitter filter to the second antenna port, ii) from the second antenna port to the second receiver filter, and iii) from the second receiver filter to the second termination impedance;
- and
- at least one directional coupler and a total antenna port, the at least one directional coupler connecting the first electrical filter arrangement and the second electrical filter arrangement to the total antenna port.
A method of configuring a total electrical filter arrangement that comprises two or more electrical filter arrangements comprising a first transmitter port, a first receiver port and a first antenna port, a second transmitter port, a second receiver port and a second antenna port the method comprising:
- connecting a first transmitter filter to the first transmitter port;
- connecting a first receiver filter to the first receiver port;
- connecting a first four-port circulator device between the first transmitter filter and the first receiver filter, the first antenna port and a first termination impedance that is connected to a first ground;
- connecting a second transmitter filter to the second transmitter port;
- connecting a second receiver filter to the second receiver port;
- connecting a second four-port circulator device between the second transmitter filter and the second receiver filter, the second antenna port and a second termination impedance that is connected to a second ground;
- and
- connecting the first antenna port and the second antenna port to at least one directional coupler, the at least one directional coupler connected to a total antenna port,
- wherein:
- the first four-port circulator device is used for admitting signals to pass i) from the first transmitter filter to the first antenna port, ii) from the first antenna port to the first termination impedance, and iii) from the first antenna port to the first receiver filter;
- and
- the second four-port circulator device is used for admitting signals to pass iv) from the second transmitter filter to the second antenna port, v) from the second antenna port to the second termination impedance, and vi) from the second antenna port to the second receiver filter.
Dependencies are inferred from the claim text.