180 degrees hybrid coupler

Details 180 degrees hybrid coupler 180 degrees hybrid coupler

2008-01-15

2008-01-15

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S116000

Reexamination Certificate

active

07319370

ABSTRACT:
A multilayer 180 degree hybrid coupler comprises a cascaded pair of quarter wavelength directional couplers, one of the connections between the directional couplers being made by direct connection and the other connection being made indirectly via a length of transmission line that introduces a 180 degree phase shift at the operating frequency of the hybrid coupler. Each directional coupler comprises a pair of broadside coupled conductive tracks on opposite sides of a dielectric layer and the length of transmission line comprises a further conductive track on at least one side of the dielectric layer. Both the direct connection and the connection via the length of transmission line extend through the dielectric layer at respective via holes so that the hybrid coupler has two input ports on one side of the dielectric layer and two output ports on the other side of the dielectric layer.

REFERENCES:
patent: 4827270 (1989-05-01), Udagawa et al.
patent: 5063365 (1991-11-01), Cappucci
patent: 7042309 (2006-05-01), Podell
Myun-Joo Park and Byungje Lee. “Coupled-Line 180° Hybrid Coupler,” Microwave and Optical Technology Letters, vol. 45, No. 2, Apr. 20, 2005. pp. 172-175.

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