Patent ID: 8736501

Claim:
A multi-band antenna comprising: two conductive wirings, which are substantially parallel to each other; and a plurality of unit circuits cascaded along the two conductive wirings, each of the unit circuits including: a communication unit that connects between the two conductive wirings through a first inductor and a second capacitor connected in series with the first inductor; and a first capacitor and a second inductor that are inserted in at least one of the two conductive wirings, the second inductor being connected in parallel with the first capacitor; wherein the first inductor, the first capacitor, the second inductor, the second capacitor, a third inductor disposed in series with at least one of the two conductive wirings, and a third capacitor disposed between the two conductive wirings satisfy a relationship expressed by a following expression 1: 1 L L ⁢ C M ≤ 1 ( L R + L M ) ⁢ C L ≤ 1 L L ⁢ C R ⁢ ( 1 + C R C M ) ≤ 1 L R ⁢ C L Ex . ⁢ 1 in which L L is a value of the first inductor, C L is a value of the first capacitor, L M is a value of the second inductor, C M is a value of the second capacitor, L R is a value of the third inductor, and C R is a value of the third capacitor.