EM analysis of PBG substrate microstrip circuits for integrated transmitter front end

In this work, electromagnetic analysis of a novel photonic bandgap (PBG) substrate microstrip line circuit is presented and its applications in an integrated antenna amplifier transmitter front end are discussed. The method-of-moments based Sonnet Suite has been used for full-wave 3D electromagnetic simulation of the microstrip on a high-density substrate having rectangular air blocks. It is shown that a single row of air blocks consisting of only 3-5 elements of optimized dimensions produce a very steep and wide (up to 10 GHz) bandgap for the microstrip mode. The results obtained demonstrate that such a structure has high potential for designing novel low-pass and band-pass filters and integrated amplifier tuning elements. The transmission-line-circuit method has been applied in obtaining analytical conditions of stopband and passband for the circuit considered. The proposed structure can be mass-produced by micro drilling in a conventional high-density substrate