Transmission line-periodic circuit representation of planar microwave photonic bandgap structures

Planar photonic bandgap structures have been modeled ruing tile theory of t ransmission lines and periodic circuits. The method allows for fast and acc urate computation of the dispersion diagram, and thus prediction of the sto pbands for two directions of propagation. Results obtained by the proposed analytic method ave in agreement with previously published numerical data f or two structures. Additional numerical evaluations of the reflection phase with the finite-difference time-domain (FDTD) method confirm the validity of the analytic model within the limits of its applicability. They also fur ther confirm previous observations that wave propagation in directions othe r than two principal axes results in a narrower stopband. (C) 2001 John Wil ey & Sons, Inc.