Broadband Directional Coupler with High Coupling Attenuation

Conference: GeMiC 2014 - German Microwave Conference
03/10/2014 - 03/12/2014 at Aachen, Germany

Proceedings: GeMiC 2014

Pages: 3Language: englishTyp: PDF

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Fackelmeier, A.; Huber, K. (Siemens AG, Corporate Technology, Erlangen, Germany)
Pott, S. (Siemens AG, Healthcare, Erlangen, Germany)

We present a high-power directional coupler for precise amplitude and phase measuring of broadband highfrequency signals. In contrast to conventional directional couplers, a significantly higher attenuation of the coupled forward signal can be achieved with the same high directivity. This results from a new ring coupling structure which corresponds to an almost lossless serial connection of directional couplers. The higher coupling attenuation allows developing directional couplers with strongly reduced losses and thus a smaller design because no heat sink is required. A realization of a micro strip based coupled line coupler with the ring design is shown.