Mh. Burchett et al., RIGOROUS ANALYSIS OF THE HIGHER-ORDER MODES, IMPEDANCE AND ATTENUATION FACTOR OF COUPLED STRIPLINES, IEE proceedings. Microwaves, antennas and propagation, 141(3), 1994, pp. 167-174
The paper presents a rigorous and computationally efficient analysis o
f coupled striplines of arbitrary dimensions based on the transverse r
esonance diffraction (TRD) technique. The calculated higher order mode
cutoff frequencies, impedance, coupling factors and attenuation facto
r are shown to give improved accuracy over a wide range of dimensions
when compared with purely analytical and numerical approaches. The TRD
results are also in excellent agreement with measured values for the
higher order mode cutoff frequencies. The design parameters can be com
puted in a fraction of the time required for numerical based technique
s such as finite elements.