Packaged Wideband Filtering Power Divider With Out-of-Phase on Multilayer Stripline

In this article, a novel packaged highly selective out-of-phase filtering power divider (FPD) with multilayer stacked stripline structure is presented, In this scheme, a looped double-coupled line (LDCL) is used to achieve power division and isolation functions. A pair of striplines are added after the LDCL to form a half-wavelength structure, and the two output ports are placed at the ends of the LDCL to achieve out-of-phase. To verify the results, the structure was built using a multilayer stacked strip printed circuit board (PCB) and subjected to electromagnetic simulation analysis. The research results show that the working frequency band of the proposed out-of-phase FPD is 2.1~3.7 GHz, with the insertion loss S21 and S31 are belw 2 dB and a return loss of less than −15 dB, 55.1% 3-dB FBW(center frequency 2.9 GHz)and the phase difference is within 10°. Compared with existing research on out-of-phase FPD, the proposed FPD has the advantages of miniaturization, simple structure, and high selectivity.