Effect of finite-width curved substrate on a microstrip transmission line

The characteristics of a microstrip transmission line with a finite-width c urved substrate are investigated in this letter by first employing the fast and accurate finite-element boundary-integral method to simulate the curre nt distribution, then using a superresolution estimation of signal paramete rs cia the rotational invariance technique (ESPRIT) algorithm to extract th e characteristic parameters of the transmission line. The validity of our s imulation tool is confirmed by a comparison of our numerical results and pr eciously published results. Radiation losses due to the finite width of the substrate are also included in this letter. (C) 1999 John Wiley & Sons, In c.