Patent ID: 8400364

Claim:
A multiband planar antenna comprising: an insulating film; a first antenna section formed on the film; and a second antenna section formed on the film, the second antenna being placed so as to face to the first antenna section across a feeding point, wherein the first antenna section includes: a first antenna element including a side having a length in an extending direction that corresponds to a first resonance frequency, the first antenna element having a band-like shape; a second antenna element placed at a predetermined distance from the first antenna element so as to be in parallel with the first antenna element, the second antenna element being shorter than the first antenna element and having a band-like shape; and a first coupling section to couple the first antenna element with the second antenna element, wherein the first antenna section has a first clearance that is between the first antenna element and the second antenna element and corresponds to a length in the extending direction of the second antenna element except for the first coupling section, wherein the second antenna section includes: a third antenna element including a side having a length in an extending direction that corresponds to the first resonance frequency, the third antenna element having a band-like shape; a fourth antenna element placed at a predetermined distance from the third antenna element so as to be in parallel with the third antenna element, the fourth antenna element being shorter than the third antenna element and having a band-like shape; and a second coupling section to couple the third antenna element with the fourth antenna element, wherein the second antenna section has a second clearance that is between the third antenna element and the fourth antenna element and corresponds to a length in the extending direction of the fourth antenna element except the second coupling section, wherein a length in the extending direction of the first clearance and a length in the extending direction of the second clearance are different from each other, wherein the length in the extending direction of the first clearance is a length which corresponds to a second resonance frequency that is higher than the first resonance frequency, and wherein the length in the extending direction of the second clearance is a length which corresponds to a third resonance frequency that is higher than the first resonance frequency and the second resonance frequency.