Patent ID: 7313367

Claim:
A switched multiplexer configured to combine a quantity of signal paths each covering a sub-octave in a frequency range, the switched multiplexer being configured to remove transmitter harmonics of an input signal to create a stable output impedance across the frequency range of from f min to f max , the switched multiplexer comprising: a transmit switch configured to receive the input signal and to generate a transmit signal in response thereto; a plurality of diplexers connected in parallel with one another, each one of the diplexers being comprised of a non-adjacent pair of the signal paths connected in parallel with one another, each one of the diplexer terminating at a resistive attenuator except for the diplexer containing the signal path covering the highest pass band; and wherein: the quantity of signal paths is determined by the formula: n =[log( f max /f min )]/[log2] with n being rounded up to the nearest even integer; each one of the signal paths including a switch and a signal path filter interconnected by one of a low-pass filter and a high-pass filter, the signal path covering the highest pass band omitting the signal path filter; the pass bands of the signal path filters being arranged to cover the frequency range with the lowest pass band being assigned to the first signal path and the next higher pass band being assigned to the next signal path up to the n th signal path, each pass band having a band width equal to about twice the band width of its next lower pass band; the non-adjacent pair of signal paths assigned to each one of the diplexers being selected such that a frequency gap exists between the pass bands of the signal path filters of the pair; each one of the low-pass and high-pass filters having a corner frequency falling between the frequency gap of the pass bands of the signal path filters of the pair; a power combiner connected to the diplexers and being configured to sum inputs received therefrom and generate a substantially stable multi-octave output impedance signal in response thereto.