Patent ID: 8933853
Filing Date: 2015-01-13
Classification: H01Q

Abstract:
1. An antenna apparatus comprising at least one radiator, wherein each of the at least one radiator comprises: a looped radiation conductor forming a first loop, and having a feed point, a first position, a second position, and a third position, which are arranged in this order along the first loop; a first inductor inserted at the first position of the radiation conductor; a first capacitor inserted at the third position of the radiation conductor; and a second inductor and a second capacitor inserted parallel to each other at the second position of the radiation conductor, wherein a second loop is formed by the second position of the radiation conductor, portions of the radiation conductor close to the second position, the second inductor, and the second capacitor, wherein each of the at least one radiator is excited through the feed point at at least two of a first frequency, a second frequency higher than the first frequency, and a third frequency higher than the second frequency, wherein each of the at least one radiator includes: (A) a first portion of the radiator along the first loop, the first portion including the first inductor, the first capacitor, and one of the second inductor and the second capacitor; (B) a second portion of the radiator including a section along the first loop, the section extending from the feed point to the second position through one of the first inductor and the first capacitor, and the second portion including the second loop; and (C) a third portion of the radiator including a section along the first loop, the section extending from the feed point to the second position through the first capacitor, or the section extending from the feed point to the first position through the first capacitor and one of the second inductor and the second capacitor, and wherein each of the at least one radiator is configured such that at least two of the first, second, and third portions resonate, and the radiator resonates at the first frequency when the first portion resonates, the radiator resonates at the second frequency when the second portion resonates, and the radiator resonates at the third frequency when the third portion resonates.