Microwave mixer with linking juxtaposed balun port

Balun coupled microwave mixer circuit layout and structure comprising:

• a dielectric substrate having two sides;
• ground plane means on said substrate;
• first and second conductors having first coplanar sections on one side of said substrate extending from said ground plane means towards each other to a separation gap therebetween, and having second extension sections extending in spaced parallel relation, said second extension sections juxtaposed on opposite sides of said substrate, one of said extension sections being connected to the first section of its respective said conductor by a link through said substrate;
• a transmission line on the other side of said substrate and juxtaposed said first sections of said first and second conductors for interacting therewith to balun couple a field balanced between said first and second conductors across said gap between said coplanar first sections and across the substrate between said juxtaposed extension sections;
• third and fourth spaced conductors on said substrate;
• and
• a diode mixer interconnecting all of said conductors for heterodyne modulation product signal generation and isolating signals on said first and second conductors from signals on said third and fourth conductors.

Balun coupled microwave mixer circuit layout and structure comprising:

• a dielectric substrate having two sides and being of low relative dielectric constant substantially less than 9;
• ground plane means on said substrate;
• first and second conductors having first coplanar sections on one side of said substrate extending from said ground plane means towards each other to a separation gap therebetween, and having second extension sections extending in spaced parallel relation, said second extension sections juxtaposed on opposite sides of said substrate, one of said extension sections being connected to the first section of its respective said conductor by a link through said substrate;
• a transmission line on the other side of said substrate and juxtaposed said first sections of said first and second conductors for interacting therewith to balun couple a field balanced between said first and second conductors across said gap between said coplanar first sections and across the substrate between said juxtaposed extension sections;
• third and fourth spaced conductors on said substrate;
• and
• a diode mixer interconnection all of said conductors for heterodyne modulation product signal generation.

Balun coupled microwave mixer circuit layout and structure comprising:

• a dielectric substrate having two sides;
• ground plane means on said substrate;
• first and second conductors having first coplanar sections on one side of said substrate extending from said ground plane means towards each other to a separation gap therebetween, and having second extension sections extending in spaced parallel relation, said second extension sections juxtaposed on opposite sides of said substrate, one of said extension sections being connected to the first section of its respective said conductor by a link through said substrate, each of said first and second conductors having a pair of stubs diverging therefrom to said ground plane means;
• a transmission line on the other side of said substrate and juxtaposed said first sections of said first and second conductors for interacting therewith to balun couple a field balanced between said first and second conductors across said gap between said coplanar first sections and across the substrate between said juxtaposed extension sections;
• third and fourth conductors on said substrate, said third conductor juxtaposed a first stub of each said pair, and said fourth conductor juxtaposed a second stub of each said pair;
• and
• a diode mixer interconnecting all of said conductors for heterodyne modulation product signal generation, each of said first sections of said first and second conductors, and each of said stubs having a length about one-quarter wave length of a signal on said transmission line.