Diffraction Field Reconstruction in Millimeter-Wave SIW Ten-Way Power Divider by Shape Optimization Technology

In this paper, a method to reconstruct the diffraction field in a millimeter-wave substrate integrated waveguide ten-way power divider by shape optimization technology is proposed. The diffraction field is reconstructed by changing the location of the metallized via hole array, which can be regarded as a continuous cylindrical reflector. The receiving diffraction field is optimized to a quasi-plane wave to be received by a transition array to achieve good magnitude and phase balance as a power dividing circuit. The proposed power divider is operated at the center frequency of 33 GHz, and over the entire Ka-band 26.5-40 GHz the return loss is less than -21 dB. The simulated insertion loss is about -12.6 dB corresponding to 54.7% power combining efficiency considering the dielectric loss, conductor loss, and radiation loss.