US4603435A — Microwave mixer apparatus

Claim 1

Independent Claim 498 words

A microwave mixer circuit comprising a first input terminal for receiving a first input signal at a first microwave frequency; a second input terminal for receiving a second input signal at a second microwave frequency; 90° phase differential means which in response to a signal at a first input thereto produces signals of equal amplitude at first and second outputs which have a 90° phase differential, and which in response to a signal at a second input thereto produces signals of equal amplitude at the first and second outputs which have a 90° phase differential; first and second 180° phase differential means which in response to a signal at an input thereto produce signals of equal amplitude at first and second outputs which have a 180° phase differential; first, second, third, and fourth non-linear mixer devices, each having an input electrode and an output electrode; said first input terminal being connected to the first input of said 90° phase differential means, said second input terminal being connected to the second input of said 90° phase differential means, said first output of said 90° phase differential means being connected to the input of said first 180° phase differential means, said first output of said first 180° phase differential means being connected to the input electrode of said first non-linear mixer device, said second output of said first 180° phase differential means being connected to the input electrode of said second non-linear mixer device, said second output of said 90° phase differential means being connected to the input of said second 180° phase differential means, said first output of said second 180° phase differential means being connected to the input electrode of said third non-linear mixer device, and said second output of said second 180° phase differential means being connected to the input electrode of said fourth non-linear mixer device, whereby the phase of the first signal at the input electrode of each of said non-linear mixer devices differs from the phase of the first signal at the input electrode of each of the other three non-linear mixer devices by 90° or 180°, and whereby the phase of the second signal at the input electrode of each of said non-linear mixer devices differs from the phase of the second signal at the input electrode of each of the other three non-linear mixer devices by 90° or 180°; first and second filter means each having an input and an output and being operable to pass a third microwave frequency from the input to the output; and the output electrode of the first and second non-linear mixer devices being connected to the input of said first filter means and the output electrodes of the third and fourth non-linear mixer devices being connected to the input of the second filter means, whereby signals at the third microwave frequency which are a product of the mixing action in the non-linear mixer devices are produced at the output of the first and second filter means.

Claim 2

Dependent Claim 498 words

A microwave mixer circuit comprising a first input terminal for receiving a first input signal at a first microwave frequency; a second input terminal for receiving a second input signal at a second microwave frequency; 90° phase differential means which in response to a signal at a first input thereto produces signals of equal amplitude at first and second outputs which have a 90° phase differential, and which in response to a signal at a second input thereto produces signals of equal amplitude at the first and second outputs which have a 90° phase differential; first and second 180° phase differential means which in response to a signal at an input thereto produce signals of equal amplitude at first and second outputs which have a 180° phase differential; first, second, third, and fourth non-linear mixer devices, each having an input electrode and an output electrode; said first input terminal being connected to the first input of said 90° phase differential means, said second input terminal being connected to the second input of said 90° phase differential means, said first output of said 90° phase differential means being connected to the input of said first 180° phase differential means, said first output of said first 180° phase differential means being connected to the input electrode of said first non-linear mixer device, said second output of said first 180° phase differential means being connected to the input electrode of said second non-linear mixer device, said second output of said 90° phase differential means being connected to the input of said second 180° phase differential means, said first output of said second 180° phase differential means being connected to the input electrode of said third non-linear mixer device, and said second output of said second 180° phase differential means being connected to the input electrode of said fourth non-linear mixer device, whereby the phase of the first signal at the input electrode of each of said non-linear mixer devices differs from the phase of the first signal at the input electrode of each of the other three non-linear mixer devices by 90° or 180°, and whereby the phase of the second signal at the input electrode of each of said non-linear mixer devices differs from the phase of the second signal at the input electrode of each of the other three non-linear mixer devices by 90° or 180°; first and second filter means each having an input and an output and being operable to pass a third microwave frequency from the input to the output; and the output electrode of the first and second non-linear mixer devices being connected to the input of said first filter means and the output electrodes of the third and fourth non-linear mixer devices being connected to the input of the second filter means, whereby signals at the third microwave frequency which are a product of the mixing action in the non-linear mixer devices are produced at the output of the first and second filter means.

Claim 3

Dependent Claim 67 words

A microwave mixer circuit in accordance with claim 1 wherein the signals at the third microwave frequency produced at the outputs of the first and second filter means have a phase differential of 180°; and including output means connected to the outputs of said first and second filter means for producing a output signal at an output terminal thereof by combining the signals from the filter means.

Claim 4

Dependent Claim 53 words

A microwave mixer circuit in accordance with claim 2 wherein said output means includes a differential amplifier having a first input connected to the output of the first filter means and a second input connected to the output of the second filter means for producing an amplified output signal at said output terminal.

Claim 5

Dependent Claim 20 words

A microwave mixer circuit in accordance with claim 1 wherein said 90° phase differential means include a quadrature power divider.

Claim 6

Dependent Claim 22 words

A microwave mixer circuit in accordance with claim 4 wherein each of said 180° phase differential means includes an antiphase power divider.

Claim 7

Dependent Claim 33 words

A microwave mixer circuit in accordance with claim 5 wherein each of said first, second, third, and fourth non-linear mixer devices comprises a GaAs field effect transistor, the input electrodes being gate electrodes.

Claim 8

Dependent Claim 355 words

Microwave mixer apparatus comprising a substrate of insulating material having flat, planar, parallel, opposite surfaces; a first input terminal on one surface of the substrate; a second input terminal on said one surface of the substrate; a quadrature power divider microstrip component on said one surface having a first input connected to said first input terminal and a second input connected to said second input terminal, and having first and second output connections; a first 180° power divider microstrip component on said one surface having an input connected to the first output connection of the quadrature power divider microstrip component and having first and second output connections; a second 180° power divider microstrip component on said one surface having an input connected to the second output connection of the quadrature power divider microstrip component and having first and second output connections; a first field effect transistor mounted on said substrate and having a gate electrode connected to the first output connection of the first 180° power divider microstrip component, and an output electrode; a second field effect transistor mounted on said substrate and having a gate electrode connected to the second output connection of the first 180° power divider microstrip component, and an output electrode; a third field effect transistor mounted on said substrate and having a gate electrode connected to the first output connection of the second 180° power divider microstrip component, and an output electrode; a fourth field effect transistor mounted on said substrate and having a gate electrode connected to the second output connection of the second 180° power divider microstrip component, and an output electrode; a first filter on said one surface having an input connection connected to the output electrodes of the first and second field effect transistors and having an output connection; a second filter on said one surface having an input connection connected to the output electrodes of the third and fourth field effect transistors and having an output connection; an output terminal on said one surface; and output means mounted on said substrate coupling the output connections of the first and second filters to the output terminal.

Claim 9

Dependent Claim 355 words

Microwave mixer apparatus comprising a substrate of insulating material having flat, planar, parallel, opposite surfaces; a first input terminal on one surface of the substrate; a second input terminal on said one surface of the substrate; a quadrature power divider microstrip component on said one surface having a first input connected to said first input terminal and a second input connected to said second input terminal, and having first and second output connections; a first 180° power divider microstrip component on said one surface having an input connected to the first output connection of the quadrature power divider microstrip component and having first and second output connections; a second 180° power divider microstrip component on said one surface having an input connected to the second output connection of the quadrature power divider microstrip component and having first and second output connections; a first field effect transistor mounted on said substrate and having a gate electrode connected to the first output connection of the first 180° power divider microstrip component, and an output electrode; a second field effect transistor mounted on said substrate and having a gate electrode connected to the second output connection of the first 180° power divider microstrip component, and an output electrode; a third field effect transistor mounted on said substrate and having a gate electrode connected to the first output connection of the second 180° power divider microstrip component, and an output electrode; a fourth field effect transistor mounted on said substrate and having a gate electrode connected to the second output connection of the second 180° power divider microstrip component, and an output electrode; a first filter on said one surface having an input connection connected to the output electrodes of the first and second field effect transistors and having an output connection; a second filter on said one surface having an input connection connected to the output electrodes of the third and fourth field effect transistors and having an output connection; an output terminal on said one surface; and output means mounted on said substrate coupling the output connections of the first and second filters to the output terminal.

Claim 10

Dependent Claim 19 words

Microwave mixer apparatus in accordance with claim 7 wherein said quadrature power divider microstrip component is a Lange coupler.

Claim 11

Dependent Claim 23 words

Microwave mixer apparatus in accordance with claim 8 wherein said first and second 180° power divider microstrip components are hybrid magic Tee components.

Claim 12

Dependent Claim 20 words

Microwave mixer apparatus in accordance with claim 9 including a conductive ground plane on the other surface of said substrate.

Claim 13

Dependent Claim 21 words

Microwave mixer apparatus in accordance with claim 10 wherein said first, second, third, and fourth field effect transistors are GaAs devices.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-07-28	1990-01-27	1990-07-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-07-28	1994-01-27	1994-07-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-07-28	1998-01-27	1998-07-29	$7700.00	Window Closed / Lapsed

Microwave mixer apparatus

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