| 摘要 |
A loop antenna is constructed by bending a linear conductor so that it forms concavo-convex portions within an antenna plane. As an example, the shape of the loop antenna comprises a long straight line portion (LP) which elongates substantially straight in the direction of the arrow X, a angle (B1) with respect to the long straight line portion (LP) and shorter than the long straight line portion (LP), and a short straight line portion (TP2) which is at a predetermined angle (B3) with respect to the short straight line portion (TP1) and at a predetermined angle (B2) with respect to the long straight line portion (LP) and has approximately same length as the short straight line portion (TP1) , wherein an acute angle portion (TG1) which is formed by the short straight line portions (TP1) and (TP2), and acute angle portions (TG2 ,TG3 and TG4) each having approximately same shape as the acute angle portion (TG1) are succeeding in the opposite direction of the arrow X to the vicinity of a feeding point (P2).
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