| 摘要 |
Microstrip coupler and method for fabricating the same, which can improve a directivity while does not affect to an active device disposed on the same substrate, the microstrip coupler, including an insulating substrate having a dielectric constant, one pair of coupled microstrip lines having a width spaced a distance from each other, extended in a longitudinal direction, and disposed on one side of the insulating substrate, and a recess formed in the insulating substrate on a side of a grounded member opposite to the microstrip lines with a width and a depth disposed in the longitudinal direction.
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