Design of wide rejection harmonic band Wilkinson power divider based on single suppressor topology for UHF applications

Abstract

Abstract This paper proposed a new topology of Wilkinson power divider based on the one harmonic suppressor structure. In previous works, low- and band-pass filters have been used instead of quarter-wavelength lines in conventional Wilkinson's power divider design. But in this research, a low-pass filter as a suppressor connected to the input terminal, then using two simple elliptical resonators divide the power. As a result, there is no need to two suppressor structures symmetrically. The operation of the power divider in this topology is that the spurious signals are completely suppressed by the suppressor structure, then the signal is divided and reaches the output terminals with the desired frequency. This innovation is being introduced for the first time. On the other hand, the proposed suppressor structure has two rectangular elliptical resonators with a long base length and two pairs of rectangular resonators with a short base length to suppress harmonics up to sixth order. Next, the power is divided using two circular elliptical resonators. The measurement results show that the insertion and return losses are 3.09/3.11 dB and 30 dB, respectively at 1 GHz frequency, and suppression of harmonics up to the 18th order.