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SUMMARYA general linear passive termination is considered for a typical ÿeld e ect power transistor such that the ÿrst m odd harmonics, excluding the fundamental frequency, are open circuited with the remaining harmonics short-circuited. Under this termination, with the appropriate resistive termination at the fundamental frequency, it is shown that an optimum maximum e ciency ofis universally achieved independent of non-linearities in the transistor. Furthermore, where higher ordered harmonics are terminated in ÿnite reactive impedances, which is the case with any realizable network, it is shown that the same maximum e ciency is obtained with the correct complex termination at the fundamental frequency.A prototype network is then deÿned including the output capacitance of the transistor and synthesized in a lowpass form which, when terminated in a shunt resonant circuit and load resistor, will provide the correct impedances at the fundamental and all of the harmonics. Remarkably, this optimum network has a simple formula for the element values in the general (2m+1)th degree network and a rigorous proof is presented in the appendix.

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SUMMARYA synthesis method is presented for the class of low-pass prototype filters having an equiripple passband response with a single transmission zero at infinity and the remainder at a finite real frequency. To synthesize the network, the even mode or the odd mode is obtained directly using the alternating pole technique and little accuracy is lost for networks up to degree 19. Tables of element values for commonly used specifications are included. Finally, the practical advantages of this prototype when used to design certain classes of filters are discussed.

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