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A method for tuning the directivity of directional couplers by simultaneously adjusting the phase velocity and the impedance level of the coupler is presented. It is shown that by using three symmetrically positioned capacitors, the solution of the compensation problem is under. Here, the additional degree of freedom is used to compensate the effect of typical manufacturing tolerances. A theory for...
A novel approach for compensating the phase velocity difference in coupled line structures is presented. It utilizes twofold symmetric four-port networks. Analytical design equations are derived. The method is shown to be superior to other lumped element compensation techniques. The advantages are the simple and straightforward design procedure and the inherently broadband compensation. A realized...
An efficient design procedure for directional couplers based on the effective even and odd mode characteristic impedances and electrical lengths is presented. These quantities which are extracted from the scattering parameters of the overall coupler structure allow for a systematic optimization. This is useful, for instance, when designing compensated high directivity couplers or when large bandwidth...
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