Improved, low-distortion, broadband directional coupler formed b

Wave transmission lines and networks – Plural channel systems – Having branched circuits

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333119, H03H 700

Patent

active

045556814

ABSTRACT:
A high frequency directional coupler having improved intermodulation distortion performance is disclosed. The coupler includes input, output, reflected, and incident ports, and current and voltage transformers. The current transformer includes at least one primary winding connected between the inlet and outlet ports and at least one secondary winding coupled with the primary winding and connected between the reflected port and ground. The voltage transformer includes a plurality of series-connected primary windings connected between the reflected and incident ports, and a plurality of series-connected secondary windings coupled with said voltage transformer primary windings, respectively, and connected between the input port and ground. Shunt capacitors connected with the input, output, reflected and incident ports increase the bandwidth of the coupler.

REFERENCES:
patent: 2909733 (1959-10-01), Walter
patent: 3048798 (1962-08-01), Simons
patent: 3559110 (1971-01-01), Wiley et al.
patent: 3624536 (1971-11-01), Norton
patent: 3872408 (1975-03-01), Reilly
patent: 4121180 (1978-10-01), Greenway
patent: 4311974 (1982-01-01), Reddy

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