Space-saving two-sided microwave circuitry for hybrid circuits
First Claim
1. A space-saving two-sided microwave transmission line for a hybrid circuit having RF circuits and dc circuits mounted on a common substrate, comprising:
- a substrate comprising an insulating layer having first and second substantially planar surfaces;
a first coplanar waveguide having a first characteristic impedance and comprising a first transmission line conductor formed on said first surface of said substrate and further characterized by corresponding first planar conductive areas formed on said first surface and spaced from said first line conductor;
a second coplanar waveguide having a second characteristic impedance equal to said first characteristic impedance and comprising a second transmission line conductor formed on said second surface of said substrate and further characterized by corresponding second planar conductive areas formed on said second surface and spaced from said second line conductor;
a line-connecting via opening formed through said substrate and comprising means for electrically connecting said first transmission line conductor to said second transmission line conductor through said via opening; and
matching means for substantially matching the via opening impedance to said characteristic impedances of said first and second coplanar waveguides.
3 Assignments
0 Petitions
Accused Products
Abstract
A space-saving, two-sided microwave transmission line for hybrid circuits is disclosed, wherein a microstrip or coplanar waveguide RF line is formed on the front side and a microstrip or coplanar waveguid RF transmission line is formed on the backside of a hybrid circuit board containing other components. The RF line is formed on the top side of the circuit board to facilitate connections to other circuit boards and/or RF components, but is routed underneath the board to traverse the areas of the board occupied by other components. When the RF line is on the top side of the substrate, the groundplane is established by the metal layer on the bottom of the substrate for a microstrip line and by a top metal layer for a coplanar waveguide line, and when the RF line is on the bottom of the substrate, the groundplane is established with the metal layer on top of the substrate for a microstrip line, and with the bottom metal layer for a coplanar waveguide line. The connection from the topside and backside RF lines is accomplished by low VSWR plated via holes through the substrate.
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Citations
25 Claims
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1. A space-saving two-sided microwave transmission line for a hybrid circuit having RF circuits and dc circuits mounted on a common substrate, comprising:
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a substrate comprising an insulating layer having first and second substantially planar surfaces; a first coplanar waveguide having a first characteristic impedance and comprising a first transmission line conductor formed on said first surface of said substrate and further characterized by corresponding first planar conductive areas formed on said first surface and spaced from said first line conductor; a second coplanar waveguide having a second characteristic impedance equal to said first characteristic impedance and comprising a second transmission line conductor formed on said second surface of said substrate and further characterized by corresponding second planar conductive areas formed on said second surface and spaced from said second line conductor; a line-connecting via opening formed through said substrate and comprising means for electrically connecting said first transmission line conductor to said second transmission line conductor through said via opening; and matching means for substantially matching the via opening impedance to said characteristic impedances of said first and second coplanar waveguides. - View Dependent Claims (2, 3, 4)
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5. A hybrid circuit having RF circuits and dc circuits, mounted on a common substrate, comprising:
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a substrate comprising an insulating layer having first and second substantially planar surfaces; a circuit housing structure for supporting edges of the second surface of said substrate; said dc circuits being mounted on a first region of said substrate first surface; a first microwave conductor line formed on said first surface of said substrate and terminating at a first conductor line end adjacent one side of said first region; a second microwave conductor line formed on said second surface of said substrate beneath said first region and terminating in a second conductor line end at said one side of said first region; a via opening formed through said substrate to connect said first line end to said second line end; and impedance matching means for matching the via opening impedance to the characteristic impedance of said first and second microwave transmission lines. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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14. A space-saving two-sided microstrip transmission line for a hybrid circuit comprising RF circuits mounted on a common substrate, comprising:
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a substrate comprising an insulating layer having a first and second substantially planar surfaces; a first microstrip conductor formed on said first surface of said substrate with a corresponding first groundplane formed on corresponding areas of said second surface of said substrate, said first conductor and ground plane comprising a first microstrip transmission line characterized by a first characteristic impedance; a second microstrip conductor formed on said second surface of said substrate with a corresponding second ground plane formed on corresponding area of said first surface of said substrate, said second conductor and groundplane comprising a second microstrip transmission line characterized by a second characteristic impedance equal to said first characteristic impedance; a via opening formed through said substrate to connect said first microstrip transmission line to said second microstrip transmission line; and matching means for matching the via opening impedance to said characteristic impedances of said first and second microstrip transmission lines. - View Dependent Claims (15, 16, 17, 18)
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19. A hybrid circuit having RF circuits and dc circuits, mounted on a common substrate, comprising:
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a substrate comprising an insulating layer having first and second substantially planar surfaces; a circuit housing structure for supporting edges of the second surface of said substrate; said dc circuits being mounted on a first region of said substrate first surface; a first microstrip conductor line formed on said first surface of said substrate and terminating at a first conductor line end adjacent one side of said first region; a second microstrip conductor line formed on said second surface of said substrate beneath said first region and terminating in a second conductor line end at said one side of said first region; a second groundplane formed on said first surface of said substrate within said first region; a via opening formed through said substrate to connect said first line end to said second line end; and impedance matching means for matching the via opening impedance to the characteristic impedance of said first and second microwave transmission lines. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification