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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]

A novel narrow‐band balanced filtering network using coupled lines loaded with stubs is proposed in this letter. Two Wilkinson power dividers using coupled lines are used to realise the six‐port balanced network. Wideband common mode suppression and power division isolation can be achieved due to the loaded open/shorted stubs. A narrow‐band balanced filtering network for the WLAN band is designed. Good agreements can be found between the simulation and measurement results. [ABSTRACT FROM AUTHOR]

A dual‐band balanced‐to‐unbalanced filtering power divider by coupled ring resonators is proposed. Two passbands can be easily realised by the two coupled ring resonators. Three transmission zeros near the two passbands are used to improve the selectivity. The common mode can be easily suppressed by the bandstop performance of the open stubs. A fabricated prototype (εr = 2.65, h = 1 mm, tanδ = 0.003) with centre frequencies located at 2.82 and 3.22 GHz is designed and measured to prove the proposed methods. [ABSTRACT FROM AUTHOR]