Planar Waveguide PBG Structure for Beamforming and Steering

The project will emphasize on the application research of Photonic Band gap for the beamforming and steering. For instance, using circular, rectangular and dumbbell shaped band gap with modulated array will construct defected ground plane of the planar waveguide and result in slow wave. It will selectively affect the transmission property and show the selective band rejection and transmission. After selected numbers of PBG under PC board, we can unify the designed pass band under different PBG structure perturbations. Filling Factor and Chebyshev Distribution Chirp will then be added for uniform and non-uniform modulation of the arrays. Sequential phase shift of microwave power through feed lines will be resulted. Power splitted 4 feed lines will be given for the design. Various PBG element numbers will be adopted for different slow wave structure. C band linear phased array will first be done by using four 0-element feed lines to investigate the beamforming properties. Various PBG shapes with different element numbers will then be studied on the phase shift properties. Circular, rectangular and dumbbell types of PBGs will be tested and evaluated. The results will be checked and optimized by using the software package IE-3D and HFSS. Fabrication will be done through photo mask, photo resist and optical lithography techniques on microwave laminates substrate. Network Analyzer and Spectrum Analyzer will assist the antenna radiation pattern and power measurement. Phase shift of radiation pattern will also be shown.

Project ID:PB9808-2365
External Project ID:NSC98-2221-E182-018