Fujitsu Corporation

Mitsuharu Hoshino

Manabu Kai

Takashi Yamagajo

Yohei Koga

Tabito Tonooka

Masatomo Mori

Minoru Sakurai

An antenna device includes: a ground plane having an edge; a matching circuit; and a T-shaped antenna element including a first element and a second element extending from a feed point to a first and second end parts. The first element has a resonance frequency that is higher than a first frequency. The second element has a resonance frequency between a second frequency and a third frequency. A first value obtained by dividing a length from a corresponding point to a first bend part by the first wavelength is less than or equal to a second value obtained by dividing a length from the corresponding point to a second bend part by the second wavelength. An imaginary component of an impedance of the matching circuit takes a positive value at the first frequency and the second frequency and takes a negative value at the third frequency.

Antenna device

An antenna apparatus includes a ground plane having an edge; a monopole type first antenna element having a first feed point and configured to communicate at a first frequency; and a monopole type second antenna element having a second feed point and configured to communicate at a second frequency, the second antenna element extending from the second feed point in a direction away from the edge. An end portion of the first antenna element is arranged closer to the ground plane than an end portion of the second antenna element is. A length of an interval between the first feed point and the second feed point is in a range of from 0.25-fold to 0.7-fold of an electrical length of a first wavelength at the first frequency. A length of the second antenna element is a length in a range of from 0.15-fold to 0.55-fold of the electrical length.

Antenna apparatus and electronic device

Growing community of inventors

Kawasaki, Japan

Mitsuharu Hoshino