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I probably should've thought a bit more and add that, when talking about return loss and network impedance characteristics, we tend to think about those within the passband of interest, but when it comes to class E and class F, those characteristics are important for first few harmonics. Deviation from theoretical load characteristics in at harmonic frequencies will decrease the efficiency. But in case of inverse F amplifiers, even harmonics are non-issue, so it makes things a lot easier.