Characteristics of Log-Periodic Transmission Line Circuits

The objectives of this and the companion papers following are to introduce and explain new concepts for the design of transmission line circuits which will theoretically provide frequency-independent performance. All of the circuits are constructed according to log-periodic design principles. As with the corresponding log-periodic antennas, these circuits may be designed to give essentially frequency-independent performance over any desired finite bandwidth. Particularly useful circuits to be described are three-port constant phase difference circuits and four-port hybrids.