Numerical and experimental study of the voltage excited along a slotline by a current source

Abstract

[1] This paper presents an analysis of a slotline excited by a current source connected across the slot. The method of moments applied in the spectral domain is used. As a result, the voltage of a wave composed of bound and leaky modes as well as residual waves is calculated along the slot. Interesting behavior of the voltage wave in the neighborhood of the source is shown. Both numerical and measured results are given.Citation: Kotlan, V., F. Mesa, and J. Machac (2010), Numerical and experimental study of the voltage excited along a slotline by a current source, Radio Sci., 45, RS1004,

Effects of the bottom ground plate on coplanar waveguide structures

“…where the left-hand side of this equation represents the surface current density in the ith slot, J (i) s , as a functional of the electric field tangential to the metalisation, E t . This equation can be solved by means of the Galerkin method in the spectral domain after expanding the electric field into a linear combination of appropriate basis functions (in the present work, weighted Chebyshev polynomials) [34,35]. This procedure leads to the following homogeneous algebraic system…”

“…To study the signals excited by a practical feeding in the previous structure, we now consider the structure in Fig. 1b, in which the CBCPW is fed by two delta-gap current sources of finite size δ, J (i) d , one at each slot [34,39,40] (these electric-current generators can be viewed as the excitation ports of the structure [39,40]). The Fourier transform of the source current impressed in the ith slot at z = 0 is given by…”

“…The solution of the above algebraic system gives the z-Fourier transform of the voltage excited by the source. After applying the corresponding inverse Fourier transform we obtain the voltage signal excited along the line [34,35,41]. For a perfectly symmetric CPW, we can study the excitation of even (odd) modes by taking I 2 = I 1 (I 2 = − I 1 ) in (4).…”

“…However, it has been widely reported that potential spurious problems may appear in this structure because of eventual power leakage in terms of parallel-plate modes. The study and suppression of this power leakage has been and is still a topic of considerable interest in the literature [16,[27][28][29][30][31][32][33][34][35][36][37].…”

Comparative analysis of the dispersion characteristics of a slotline and a microstrip line

“…1(b), modeled by a Gaussian function in the z direction. This analysis results in the electromagnetic field distribution of the wave excited on the slotline [8]. The particular mode complex propagation constants coincide with the positions of the poles in the complex k z propagation constant plane [4].…”