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Diplexers are two or more combined filters in a single package that are adopted to separate two or more different frequencies This concept can be employed to separate the transmit from the receive frequency in a frequency division duplex (FDD) transceiver, in which application it is sometimes referred to as a duplexer A diplexer also can be placed at the output of a mixer stage (Fig 646), where it functions as an absorptive filter In this mixer application, the first filter of the diplexer has a passband that corresponds to the undesired frequencies, so these pass right through and are then terminated into a 50-ohm load These same undesired frequencies are blocked from entering the second filter by the filter s own stopband, but its passband passes the desired signals onto the IF sections of the receiver Thus, the undesired signals through the first filter are absorbed, instead of reflected, because they are properly terminated into the 50-ohm resistive load This will prevent any undesired frequency products created by mixer nonlinearities from being bounced off a standard filter s reflective stopband and returning to the mixer, causing increased IMD levels

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Figure 6-1 An enlargement of a newspaper comic reproduced to its actual size to show how colored inks are patterned to create different shades

There are many different combinations of two-filter diplexers: bandpassbandpass, bandpass low pass, low pass high pass, etc, depending on the application

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A diplexer must be designed as two different-frequency filters with nonoverlapping passbands If their passbands are placed too close together, they will react adversely with each other This deleterious effect will decrease return loss and increase insertion loss, while losing passband flatness and symmetry In addition, each filter section of a bandpass diplexer should normally begin with a series resonant pole at the input, and not a shunt element, as a shunt element can short out the other filter s frequency of interest and destroy the return loss of the entire diplexer Both bandpass filters of the diplexer of Fig 647 have a series resonant input pole instead of a shunt tank, and each filter has a 50-ohm input (A 100ohm input impedance is not required because each filter is resonant at a different frequency, fr1 and fr2; this allows each filter to pass its frequency of interest, with the other filter looking like a complete open) A simple bandpass type of diplexer is shown in Fig 648, and can be used in nondemanding applications: 1 Q 2 L2 3 C2 4 L1 5 C1 fr /BW Q 50 628fr 1 L2(628 fr)2 50 Q(628fr) 1 L1(628 fr)2

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