Patent ID: 7154353

Claim:
A microstrip line comprising: a first dielectric substrate having an outer main surface and an inner main surface; a second dielectric substrate provided in parallel to said first dielectric substrate, said second dielectric substrate having an outer main surface and an inner main surface; an adhesive layer provided between the first and second dielectric substrates and in contact with the inner main surfaces of the first and second dielectric substrates; at least one ground conductive layer provided in each of a layer on the outer main surface of the first dielectric substrate, the adhesive layer and a layer on the outer main surface of said second dielectric substrate; and at least four signal lines extending in parallel to one another, wherein at least one of the at least four signal lines is provided in each of the layer on the outer main surface of the first dielectric substrate, the adhesive layer and the layer on the outer main surface of said second dielectric substrate with the fourth signal line of the at least four signal lines provided in any one of the layer on the outer main surface of the first dielectric substrate, the adhesive layer and the layer on the outer main surface of the second dielectric substrate, the ground conductive layers provided in each of the layer on the outer main surface of the first dielectric substrate, the adhesive layer and the layer on the outer main surface of said second dielectric substrate extend in parallel to said at least four signal lines extending in parallel to one another, and each signal line provided in the layer on the outer main surface of the first dielectric substrate is opposed to a ground conductive layer provided in the adhesive layer and a ground conductive layer provided in the layer on the outer main surface of the second dielectric substrate, each signal line provided in the adhesive layer is opposed to a ground conductive layer provided in the layer on the outer main surface of the first dielectric substrate and any ground conductive layer provided in the layer on the outer main surface of the second dielectric substrate, and each signal line provided in the layer on the outer main surface of the second dielectric substrate is opposed to any ground conductive layer provided in the adhesive layer and any ground conductive layer provided in the layer on the outer main surface of the first dielectric substrate.