Design And Implementation Of Planar Phase Shiftet

The implementation of a planar phase shifter using Substrate Integrated Waveguide (SIW) technology is presented for 5G high-frequency applications. SIW enables waveguide-like performance within a compact planar implementation, offering low loss, strong field confinement, and stable phase behavior. The implemented design employs a slot-loaded SIW section to produce controlled variations in the propagation constant, thereby achieving the required phase shift without significantly increasing insertion loss. The structure is realized on a Rogers RT5880 substrate and validated through full-wave simulation in CST Microwave Studio. Key performance metrics - return loss, VSWR, transmission coefficient, and phase response are measured and analyzed to verify the implementation. The results demonstrate that the implemented SIW section yields accurate phase delay, low loss, and reliable guided-wave operation, making the implementation suitable for 5G and other millimeter-wave RF systems.