ANALYSIS OF SLOT-COUPLED TRANSITIONS FROM MICROSTRIP-TO-MICROSTRIP AND MICROSTRIP-TO-WAVE-GUIDES

This paper provides an accurate, versatile, and computationally effici ent method for the analysis of slot-coupled transitions from microstri p-to-microstrip, and microstrip-to-rectangular and parallel-plate wave guides, The accuracy of this method is ensured by satisfying all the b oundary conditions through a mixed electric-magnetic current integral equation formulation, combined with the moment method, Computational e fficiency is achieved by limiting the discretization to only the strip s and apertures and by using the accurate and rapidly convergent compl ex images, To verify the accuracy of this method, the transitions are analyzed using the finite-difference time-domain (FDTD) method, Experi mental results are also obtained for some structures, Close agreement is found between the complex image results, the FDTD results, and expe riment over a wide frequency range.