| 摘要 |
One aspect of the invention includes a directional coupler having a coupling factor in the forward direction determined from the equation Cf=Cf.ejphiCf, a coupling factor in the reverse direction determined from the equation Cr=Cr.ejphiCr, an isolation in the forward direction determined from the equation If=If.ejphiIf, and an isolation in the reverse direction determined from the equation Ir=Ir.ejphiIr, wherein at least one condition is met from among the group consisting of: (1) the absolute value of Deltaphi=phiCr+phiCf-(phiIr+phiIf) being less than or equal to 20°, K = C f C r * I r I f ( 2 ) is less than or equal to 1.6, and (3) Cf=Cr and If=Ir.
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