title: CALCULATION OF MICROSTRIP DIRECTIONAL COUPLERS WITH DISPERSION AND LOSSES IN TRANSMISSION LINES
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 &lt;1 three- and four-stab directional couplers become more 
journal: Radio Electronics Computer Science Control