CALCULATION OF MICROSTRIP DIRECTIONAL COUPLERS WITH DISPERSION AND LOSSES IN TRANSMISSION LINES

S. N. Romanenko, V. P. Dmitrenko, V. A. Voskoboynyk

Abstract


Simple analytical relations for calculating parameters of microstrip directional couplers are obtained. It is shown that depending on the power splitting ratio k in the output ports of the circuit the technological restrictions of couplers are changed. At k ≥1 for double-stab four-port directional coupler, unlike three- and four-stab couplers, the range of characteristic impedance satisfies the technological restrictions. However, at k <1 three- and four-stab directional couplers become more technological. Analytical formulas for high precision calculation of the dispersion of effective permittivity and losses in the substrate valid for the main microstrip T-wave in a wide frequency range are also presented.

Keywords


splitting ratio, directional coupler, microstrip line, dispersion, losses

References


Drobaxin O. O., Plaksin S. V., Ryabchij V. D., Salty’kov D. U. Texnika i poluprovodnikovaya elektronika SVCH, Sevastopol’, Veber, 2013, 322 p.

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Jansen R. H. High-speed computation of single and coupled microstrip parameters including dispersion, high-order modes, loss and finite strip thickness, IEEE Trans. Microwave Theory Tech., 1978, Vol. 26, No. 2, рр. 75–81.


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DOI: https://doi.org/10.15588/1607-3274-2013-2-5



Copyright (c) 2014 S. N. Romanenko, V. P. Dmitrenko, V. A. Voskoboynyk

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