Study and microwave applications of artificial periodic substrate PBG planar circuits

This paper presents the results of analytical study and numerical simulation as well as discusses various microwave applications of artificial periodic substrate photonic bandgap (PBG) circuits. The configurations considered are planar microstrip and coplanar line circuits on the high-density dielectric substrate containing finite-periodic groups of air blocks underneath the lines. Transmission matrix method has been applied for analyzing the transmission/reflection characteristics of the circuits and obtaining the stopband and passband conditions. Simulation results illustrating applications of PBG circuits as microwave bandpass filters and harmonic tuning elements are presented. The configurations discussed here provide certain advantages and promising solutions in the design of novel integrated antennas and adaptive arrays for the next-generation mobile communication systems.