Radar system having low-profile circulator

Communications: directive radio wave systems and devices (e.g. – Radar transponder system

Reexamination Certificate

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C333S001100, C342S175000

Reexamination Certificate

active

07138937

ABSTRACT:
A circulator comprises first and second couplers. The first and second couplers are coupled by first and second transmission lines. First and second magnetic fields are provided crossing the first and second transmission lines, respectively. In an exemplary embodiment, the magnetic fields are substantially parallel with and within a plane defined by the first and second transmission lines.

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Miura, T., “An Experimental High Isolation Ferrite Substrate Circulator Magnetized by Trigonally Symmetric Pole Pieces”, Magnetics, IEEE Transactions on, vol. 8, Issue 3, Sep. 1972, pp. 509-510.
Pan et al., “High Performance Millimeter-Wave Microstrip Circulator for Deep Space Communications”, Microwave Symposium Digest, 1990., IEEE MTT-S International, May 8-10, 1990 pp. 1015-1017 vol. 3 □□.
Oliver et al., “Integrated self-biased hexaferrite microstrip circulators for millimeter-wavelength applications” □□Microwave Theory and Techniques, IEEE Transactions on, vol. 49, Issue 2, Feb. 2001 pp. 385-387.
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Chen-Yu Chi and Gabriel M. Rebeiz, “Design of Lange-Couplers and Single-Sideband Mixers Using Micromachining Techniques,” IEEE Transactions on Microwave Theory and Techniques, vol. 45, No. 2, Feb. 1997, pp. 291-294.

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