Compact filtering power divider with extended stopband using out‐of‐phase feeding scheme.

A compact filtering power divider is proposed with very wide stopband suppression in this letter. First, the dual‐composite right‐ and left‐handed (D‐CRLH) resonator is employed, while one extended stopband can thus be achieved due to its inherently slow‐wave response. Secondly, one out‐of‐phase feeding scheme is introduced to realise D‐CRLH filtering power divider. By putting the input and output ports on the different sides of D‐CRLH resonators, the mismatching can be realised for the harmonics below 10 GHz and wide stopband suppression is obtained accordingly. For experimental verification, a compact filtering power divider is designed, fabricated, and measured. Wide stopband suppression is observed until 5f0 without using bandstop structures or complex coupling topology. [ABSTRACT FROM AUTHOR]