Design of 2.4 GHz power divider with harmonic suppression

A 2.4 GHz power divider with harmonic suppression is presented. It comprises two sets of hook-shaped resonators in each branch. By adjusting the widths and lengths of the hook-shaped strips, it is convenient to control the third and fifth harmonic suppression separately without affecting the passband performance. Experimental results show insertion losses of 3.453 and 3.341 dB, the return loss of 19.3 dB and better than 14 dB isolation at the centre frequency. Furthermore, excellent out-of-band rejection can be observed, including 46.2 dB suppression for the third harmonic and 37.35 dB suppression for the fifth harmonic.