Title :
Enhancing performances of multilayered directional couplers on anisotropic substrates
Author :
Tounsi, M.L. ; Khodja, A. ; Haraoubia, B.
Author_Institution :
Fac. of Electr. Eng., USTHB Univ., Algiers, Algeria
Abstract :
In this paper, we present an efficient variational technique for the analysis of the characteristics of multilayered directional couplers fabricated on anisotropic substrates on a quasi-static approach. Numerical results are presented for coupler designs in multilayered configurations. The variation of its characteristic parameters with crystal axis offsets is also reported. It is shown that high directivity can be achieved by making use of the substrate anisotropy in conjunction with a top cover to equalize even and odd-mode phase velocities.
Keywords :
Green´s function methods; electric admittance; microstrip directional couplers; transmission line theory; variational techniques; Green´s functions; anisotropic substrates; characteristic parameters; crystal axis offsets; efficient variational technique; even-mode phase velocities; four-port devices; high directivity; multilayered directional couplers; odd-mode phase velocities; quasi-static approach; reflected microwave power; shielded microstrip; transmission-line equivalent model; Anisotropic magnetoresistance; Dielectric substrates; Directional couplers; Microstrip; Monitoring; Permittivity; Power measurement; Power transmission lines; Sampling methods; Transmission line measurements;
Conference_Titel :
Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003 10th IEEE International Conference on
Print_ISBN :
0-7803-8163-7
DOI :
10.1109/ICECS.2003.1301669
