Patent ID: 7876171

Claim:
A balance-unbalance conversion element including: a dielectric substrate; an electrode pattern on a surface of the dielectric substrate, the electrode pattern including: a first ¼-wavelength resonance line coupled to a first balance terminal, the first ¼-wavelength resonance line forming a first ¼-wavelength resonator; a second ¼-wavelength resonance line coupled to a second balance terminal, the second ¼-wavelength resonance line forming a second ¼-wavelength resonator; and a ½-wavelength resonance line having a first open end coupled to an unbalance terminal and the first ¼-wavelength resonator and a second open end coupled to the second ¼-wavelength resonator; and a balance characteristic adjustment electrode having a tip end opposed to a side of the ½-wavelength resonance line and a base end electrically coupled to a ground electrode, wherein a center line of the electrode pattern on the surface of the dielectric substrate and the center of the tip end of the balance characteristic adjustment electrode are separated from each other.