Layered multiconductor coupled slot and strip-slot structures are characterized
by introducing the full-wave modal analysis as well as the quasi-TEM spectral domain
technique. In the modal analysis, the electric and magnetic fields are constructed in
terms of modal fields in different regions. Application of the boundary conditions at
interfaces for the tangential components of the electric and magnetic fields results in the
dyadic Green's function, which interrelates the tangential currents and electric fields at
the boundaries of the layered structure. The slot fields and strip currents are expanded
in terms of a set of known basis functions with unknown coefficients. Use of the
Galerkin method leads to a set of algebraic equations. The non-trivial solutions for the
propagation constants are found by setting the determinant of the algebraic equations
equal to zero. All the other normal mode parameters including the modal impedances,
the field and current eigenvectors are then computed by using the solutions of the
propagation constants. In the quasi-TEM analysis, the Laplace equation is transformed
to an ordinary differential equation in the spectral domain, the solution of which
together with the boundary conditions yields the Green's function which interrelates the
potential and the charge distribution at the interfaces of the layered structure. The
charge distribution is expanded in terms of known functions with unknown coefficients
which are subsequently evaluated by applying the Galerkin method. Once the charge
distribution is found, the quasi-TEM characteristics of the coupled strip-slot structures
are readily calculated.
Different impedance definitions proposed in the literature for multiple coupled
line structures are discussed. The only useful impedance definition in the design of
microwave and millimeter-wave circuits is the one that results in a symmetric
impedance matrix for a coupled line structure in a lossless, isotropic, and linear
medium. The normal mode impedance definition as based on the reciprocity is used to
systematically study the impedance characteristics of various coupled slot structures for
the first time, which together with the propagation characteristics are used to compute
equivalent circuit models for ideal coupled line structures. The applications of the
coupled slot and strip-slot structures are illustrated through design examples of
enhanced couplers and power dividers consisting of coupled line multiports. Time
domain simulation of coupled multiconductor structures with slotted ground planes is
also presented to exemplify the applications of the techniques developed in this thesis to
layered interconnects and packaging structures in high-speed circuits. Some novel
techniques to reduce the crosstalk noise in those structures are proposed with
theoretical examples and experimental results. / Graduation date: 1994
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/36174 |
| Date | 15 September 1993 |
| Creators | Luo, Sifen |
| Contributors | Tripathi, Vijai K. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
Page generated in 0.0025 seconds