Microstrip which is able to supply DC bias current

A microstrip line comprising:

• a dielectric substrate having a lower surface and an upper surface opposite to said lower surface;
• a grounded conductor disposed on the lower surface of said dielectric substrate;
• a conducting strip of width W disposed on the upper surface of said dielectric surface;
• an upper conductor disposed on top of said conducting strip and having a cross sectional configuration with a maximum width w2 which is smaller than the width W of said conducting strip;
• wherein said upper conductor includes a lower portion having a width w1 that is smaller than the width w2, an upper portion having the width w2, and an intermediate portion located between said lower and said upper portions and having a width that gradually increases from w1 to w2.

A microstrip line comprising:

• a dielectric substrate having a lower surface and an upper surface opposite to said lower surface;
• a grounded conductor disposed on the lower surface of said dielectric substrate;
• a conducting strip of width W disposed on the upper surface of said dielectric surface;
• an upper conductor disposed on top of said conducting strip and having a cross sectional configuration with a maximum width w2 which is smaller than the width W of said conducting strip;
• wherein said upper conductor has a wedgelike cross section with an upper end length of the maximum width w2 and a lower end length of a width of w1 that is smaller than the width of w2.