Non-foster impedance matching of antennas without using Non-Foster elements

Non-Foster impedance matching circuits for electrically small dipoles and monopoles generally require floating series negative capacitors. A new circuit for this purpose is proposed. The circuit is based on a restricted class of components that admits only positive and negative resistors, capacitors, and gyrators. In particular, no negative capacitors or inductors are needed. Non-Foster 2-port circuits that realize a floating series negative capacitor are presented that have no negative capacitors or inductors and, in addition, satisfy the Carlin-Youla bound on the number of positive and negative resistors.