A Design of Power Divider With Negative Group Delay Characteristics

Abstract

In this letter, the design of power divider with negative group delay (NGD) characteristics is presented. From an analysis, the NGD associated with different transmission paths is found to be identical and obtained by loading resistor connected short-circuited coupled lines with an open-circuited isolation port. The proposed structure is validated by constructing a two-way microstrip line power divider with equal power division ratio, which is centered at 2.14 GHz. The measured results show excellent agreement with simulations and theoretically predicated results. From the measurement, the group delays and magnitudes of $S$ -parameters between the different transmission paths are determined as $-1.16~{\rm ns}$ , $-9.29~{\rm dB}$ , $-1.17~{\rm ns}$ , and $-9.30~{\rm dB}$ . The measured input/output return losses and isolation at center frequency are higher than 28.92 dB, 26.76 dB, and 42.2 dB.