Electrical filter topology

1 . 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.

2 . The total electrical filter arrangement according to claim 1 , wherein the first four-port circulator device comprises a first circulator port that is connected to the first termination impedance, a second circulator port that is connected to the first transmitter filter, a third circulator port that is connected to the first receiver filter, and a fourth circulator port that is connected to the first antenna port, wherein signals input at the second circulator port mainly pass only via the fourth circulator port, wherein signals input at the fourth circulator port mainly pass only via the third circulator port, and wherein signals input at the third circulator port mainly pass only via the first circulator port.

3 . The total electrical filter arrangement according claim 1 , wherein the first termination impedance is a matched impedance.

4 . The total electrical filter arrangement according to claim 1 , further comprising:

a first isolator device connected between the first transmitter port and the first four-port circulator device; and

a second isolator device connected between the first receiver port and the first four-port circulator device,

wherein the first isolator device is adapted to enable signals to mainly pass only towards the first four-port circulator device,

wherein the second isolator device is adapted to enable signals to mainly pass only towards the first receiver port.

5 . The total electrical filter arrangement according to claim 1 , wherein the two or more electrical filter arrangements are connected to the total antenna port via at least one connecting element.

6 . The total electrical filter arrangement according to claim 5 , wherein the at least one connecting element is the at least one directional coupler.

7 . A microwave link transceiver arrangement comprising the total electrical filter arrangement according to claim 1 , an antenna device and a radio unit, wherein the total electrical filter arrangement is connected between the antenna device and the radio unit.

8 . The total electrical filter arrangement according claim 1 , further comprising:

a third electrical filter arrangement comprising:

a third transmitter port, a third receiver port and a third antenna port, a third transmitter filter connected to the third transmitter port and a third receiver filter connected to the third receiver port, a third four-port circulator device that is connected between the third transmitter filter and the third receiver filter, the third antenna port, and a third termination impedance that is connected to a third ground,

wherein the third four-port circulator device is adapted to admit signals to pass i) from the third transmitter filter to the third antenna port, ii) from the third antenna port to the third receiver filter, and iii) from the third receiver filter to the third termination impedance; and

at least a second directional coupler, the at least the second directional coupler connecting the at least one directional coupler and the third electrical filter arrangement to the total antenna port.

9 . The total electrical filter arrangement according claim 1 , further comprising a connection to a radio unit, the radio unit comprising a receiver device and a transmitter device.

10 . 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.