Patent ID: 7606184

Claim:
A multiplexer for separating an input signal into at least a first output signal in a first frequency band and a second output signal in a second frequency band, the multiplexer comprising: a first bandpass filter having an input for receiving the input signal and an output for passing the first output signal, said first bandpass filter comprising at least a first lowpass filter and a first highpass filter; and a second bandpass filter having an input for receiving the input signal and an output for passing the second output signal, said second bandpass filter comprising at least a second lowpass filter and a second highpass filter, wherein the first frequency band is lower on a frequency spectrum than the second frequency band, wherein the first lowpass filter is coupled in series with the first highpass filter, wherein the first lowpass filter precedes the first highpass filter, from the perspective of passing from the input of the first bandpass filter to the output of the first bandpass filter, and wherein the multiplexer further includes at least a first additional highpass filter.