A Complete Family of Simple Bandpass LC Matching Circuits

ABSTRACT – The task of matching real and complex loads is here addressed. Four three-element true-bandpass L-C networks, forming a family capable of matching any kind of real and first-order reactively constrained loads, are presen-ted and discussed. A set of Q-based conjugate matched design equations are derived, yielding respective exact solutions to these circuits and carrying out a comparison with a previously described approximate solution. Designability limits for the exact, and, the penalties for using the approximate solution are described. An investigation is conducted to obtain complex load matching limits. Comparisons with other types of three-element matching circuits are performed, showing that the present circuits are quite effective for dealing with complex loads. The problem of matching double terminated complex loads is also discussed and solutions for some cases are presented