Patents Assigned to Poseidon Scientific Instruments Pty Ltd
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Patent number: 7046099Abstract: An oscillator having a desired output frequency, comprising a cavity resonator 102 loaded with an anisotropic dielectric material and an oscillator circuit 100 including the cavity resonator 102 as a frequency determining element, the oscillator circuit 100 arranged to operate the cavity resonator 102 at a first frequency in a first mode and at a second frequency in a second mode, the first mode and the second mode each being influenced to a different extent by the thermal coefficient of permittivity of at least one crystal axis of the dielectric material, the oscillator circuit arranged to produce the desired operating frequency from the first frequency and the second frequency. The first frequency and the second frequency differ by an amount corresponding to the desired output frequency.Type: GrantFiled: April 30, 2004Date of Patent: May 16, 2006Assignees: Poseidon Scientific Instruments Pty Ltd, The University of Western AustraliaInventors: Eugene Nikolay Ivanov, Michael Edmund Tobar, John Gideon Hartnett
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Patent number: 6944565Abstract: A signal analysis instrument (10) and a receiver. The signal analysis instrument (10) comprises a computer (12), a phase shift mechanism, a receiver mechanism and data acquisition device. The phase shift mechanism comprises an input (100) for receiving a first high frequency signal; a phase shifter (114) arranged to act on the first high frequency signal to produce a phase-shifted first high frequency signal; and a phase shift controller (116) arranged to control operation of the phase shifter (114) in response to instructions from the computer (12). The receiver mechanism comprises a mixer (104) and a first signal conditioning circuit (106). The mixer (104) is responsive to the phase-shifted first high frequency signal and to a second high frequency signal to produce a mixer output signal. The first signal conditioning circuit (106) is responsive to the mixer output signal to produce a receiver output signal.Type: GrantFiled: August 8, 2003Date of Patent: September 13, 2005Assignee: Poseidon Scientific Instruments Pty LtdInventors: Cameron Mcneilage, Mehran Mossammaparast, Paul Richard Stockwell
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Patent number: 6753690Abstract: An interferometric signal processing apparatus (10) producing an output signal from a first input signal (34) and a second input signal (34), the input signals (34) having substantially equal carrier frequencies, comprising a bridge (12) having a first arm (26) and a second arm (28), each arm having a first end (30) and a second end (32), the first and second input signals (34) being input to the first end (30) of the first and second arms (26, 28), respectively; a device-under-test (36) provided the first arm (26); a carrier suppressor (14) connected to the second ends (32) of the first and second arms (26, 28) to produce a carrier-suppressed signal at its output (A); an amplifier (16) arranged to amplify said carrier-suppressed signal; and a mixer (22, 24) responsive to the amplified carrier-suppressed signal and a carrier-dominated signal to produce the output signal; wherein the differential group delay between: the first end (30) of the first arm (26) and the output (A) of the carrier suppressor (14); anType: GrantFiled: November 5, 2001Date of Patent: June 22, 2004Assignees: Poseidon Scientific Instruments Pty Ltd, University of Western AustraliaInventors: Eugene Nikolay Ivanov, Richard Alec Woode, Michael Edmund Tobar
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Patent number: 5990767Abstract: A method of producing a microwave resonator comprising a cavity (50) defined, at least in part, by a generally cylindrical wall (64) having an electrically conductive inner surface and containing a generally cylindrical piece of low loss dielectric material (22), characterised by forming a generally cylindrical piece of low loss dielectric material of predetermined size and placing same in a cavity to produce a microwave resonator which operates in a particular mode at a specific frequency at a particular temperature. Microwave radiation corresponding to a further operating mode is then passed into the cavity and then the frequency corresponding to the further operating mode is searched for and measured. A further generally cylindrical piece of dielectric material is produced by scaling from the first piece of dielectric material according to the ratio between the first and second frequencies.Type: GrantFiled: November 21, 1997Date of Patent: November 23, 1999Assignees: Poseidon Scientific Instruments Pty Ltd, University of Western AustraliaInventors: Eugene Nikolay Ivanov, David Gerald Blair, Michael Edmund Tobar, Jesse Hyuck Searls, Simon John Edwards
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Patent number: 5714920Abstract: A method of producing a microwave resonator comprising a cavity (50) defined, at least in part, by a generally cylindrical wall (64) having an electrically conductive inner surface and containing a generally cylindrical piece of low loss dielectric material (22), characterized by forming a generally cylindrical piece of low loss dielectric material of predetermined size and placing same in a cavity to produce a microwave resonator which operates in a particular mode at a specific frequency at a particular temperature. Microwave radiation corresponding to a further operating mode is then passed into the cavity and then the frequency corresponding to the further operating mode is searched for and measured. A further generally cylindrical piece of dielectric material is produced by scaling from the first piece of dielectric material according to the ratio between the first and second frequencies.Type: GrantFiled: November 30, 1994Date of Patent: February 3, 1998Assignees: Poseidon Scientific Instruments Pty Ltd., The University of Western AustraliaInventors: Eugene Nikolay Ivanov, David Gerald Blair, Michael Edmund Tobar, Jesse Hyuck Searls, Simon John Edwards