Monolithic double balanced microstrip mixer with flat conversion loss
Patent 5428840 Issued on June 27, 1995. Estimated Expiration Date: 
December 10, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 10, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDouble-balanced mixer circuit Frequency conversion circuits Monolithic double balanced mixer with high third order intercept point employing an active distributed balun Patent #: 5060298 InventorAssigneeApplicationNo. 165355 filed on 12/10/1993US Classes:455/326, With balanced mixer333/26, Having long line elements455/327, Stripline455/330, With nonlinear impedance (e.g., diode)455/333Transistor or integrated circuitExaminersPrimary: Eisenzopf, Reinhard J.Assistant: To, Doris H. Attorney, Agent or FirmInternational ClassH0HB 001/26AbstractA double balanced microstrip mixer circuit for a monolithic microwave integrated circuit comprising a diode ring modulator coupled to a first balun for supplying radio frequency signals to the mixer circuit and a second balun for supplying a signal generated locally to the mixer circuit, two outputs leading from the diode ring modulator for providing an intermediate frequency signal, a first pair of circuits coupled between the first balun and the diode ring modulator and a second pair of circuits coupled between the second balun and the diode ring modulator, for enabling broadband frequencies to be applied to the diode ring modulator independent of impedances created by the first and second baluns. The circuit further includes two low pass filters each coupled to one of the two outputs for rejecting unwanted feed through and a in-phase combiner coupled to the low pass filters.Other References
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