Mitsumi Electric Company Ltd.

Isao Fukae

Junichi Noro

Akira Miyoshi

Masaaki Miyata

Toshihiko Inaba

Kazunari Saito

Tomohiro Shinkawa

Akira Yoneya

Kenichi Taguchi

Satoshi Kohno

Takashi Horikawa

Wataru Sakaguchi

An antenna apparatus includes: a circuit board that has a main surface and a rear surface opposite to each other; an antenna element that is formed of a metal plate and is arranged at a predetermined distance from the main surface of the circuit board; a plurality of legs that extend from the antenna element toward the circuit board; a ground conductor that is formed on the main surface or the rear surface of the circuit board; a feeding pin that supplies power from the circuit board to the antenna element; and a plurality of comb-shaped capacitor patterns that are formed on one of or both the main surface and the rear surface of the circuit board and are electrically connected between the plurality of legs and the ground conductor.

Antenna apparatus

In a loop antenna including a circuit board, a cylindrical body standing on a surface of the circuit board, and a loop antenna element formed on the cylindrical body along the peripheral surface, a tubular insulator member is placed with some space around the cylindrical body. A conductor ring is formed on the tubular insulator member along the peripheral surface, and is placed on an intermediate position between the surface of the circuit board and the plane formed by the loop antenna element. A conductor wall is placed with some space around the cylindrical body on an intermediate distance between the surface of the circuit board and the plane formed by the loop antenna element into height.

Loop antenna having better directivity in low range of angle of elevation

In an electromagnetic coupling type four-point feeding loop antenna ( ) comprising a tubular body ( ), a loop portion ( ) having a loop width (W ), four feeders ( ) each having a feeder width (W ), and four electromagnetic coupling wires ( ) each having a coupling wire width (W ), the loop width, the feeder width, and the coupling wire width are substantially equal to one another. A gap (&dgr;) between the feeder and the electromagnetic coupling wire is laid in a range between 0.2 mm and 0.8 mm, both inclusive, when the electromagnetic coupling type four-point feeding loop antenna has a feeding impedance of a range between 25 &OHgr; and 100 &OHgr;, both inclusive.

Four-point feeding loop antenna capable of easily obtaining an impedance match

A composite antenna apparatus includes a cylindrical member formed by a flexible insulating film rolled into a cylindrical shape, a plurality of antenna patterns formed in a helix pattern on a peripheral surface of the cylindrical member a circuit board fixed to one axial end of the cylindrical member and having a circuit pattern connected to the antenna patterns by soldering, and a monopole antenna disposed inside the cylindrical member and standing up on one surface of the circuit board The circuit board is provided with a first metallic pattern having a predetermined area and formed on the one surface of the circuit board at a position inside the cylindrical member

Composite antenna apparatus

Growing community of inventors

Tokyo, Japan

Isao Fukae