Compact in‐phase power divider integrated filtering response using spiral resonator

A compact in‐phase power divider with filtering response is presented in this study. Spiral resonators are meant to realise compact size and bandpass‐filtering response. To improve the frequency selectivity of the presented power divider, a source–load cross‐coupling is introduced by placing input and output coupling lines. An in‐phase power divider with passband‐filtering response has been designed, fabricated and measured. The measured return loss and insertion loss of the fabricated power divider are 22 and 1.3 dB at 2.45 GHz, respectively. The 3 dB operating bandwidth of the fabricated power divider is 175 MHz. The total area of the fabricated power divider is 0.15 λ g × 0.3 λ g . The measured results verify the predicted attractive features.