Graduate Thesis Or Dissertation
 

Nonsymmetrical coupled microstrip lines for applications as ideal directional couplers

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  • A variational integral method in the Fourier transform domain is used to calculate the characteristic normal mode parameters of a coupled pair of nonsymmetrical microstrip transmission lines in an inhomogenous dielectric medium under quasi-TEM conditions. These together with the theory of such structures are used to show that ideal directional couplers with impedance transforming capabilities can be physically realized by utilizing coupled nonsymmetrical microstrips deposited on composite substrates or a single substrate with a dielectric overlay. The numerical results obtained agree quite well with known results for special cases which have been analyzed using other methods. Numerical results for coupler parameters are presented for some typical structures. The techniques and results presented in this thesis should be quite helpful in the design of ideal couplers and other microwave circuit elements in the form of planar structures that are amenable to integrated circuit design.
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