A Novel Substrate Integrated Waveguide (SIW) Based Highly Selective Filtering Power Divider

Aims: In this paper, a novel Substrate Integrated Waveguide (SIW) based filtering power divider is presented. Objectives: In the proposed power divider, filtering response is achieved by interleaving inductive posts in the SIW structure. The proposed structure reduces the size and the cost of the system, as the structure performs the function of the power divider as well as the function of a filter. Methods: Simulation of the proposed structure was carried out using commercial software Ansoft High Frequency Structure Simulator (HFSS), which is a three-dimensional full-wave solver utilizing the Finite Element Method (FEM). The proposed power divider structure was also fabricated and tested. Result: The measured return loss was found to be -21.78 dB with 3 dB Fractional Bandwidth (FBW) of 4.72% at the center frequency of 14.8 GHz. Moreover, the proposed structure showed an insertion loss of 0.96 dB, isolation of more than 18 dB; maximum amplitude and phase imbalance was observed to be 0.18 dB and 1.24° respectively within the operating frequency band. Conclusion: Good agreements are observed between the experimental results and the simulations.