# US 8,542,149 B2 · Antenna and electronic device equipped with same

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- Number: US 8,542,149 B2
- Document ID: US8542149B2
- Status: Granted
- Kind: B2
- Application number: 12/718,025
- Filed: 2010-03-05
- Published: 2011-03-10
- Granted: 2013-09-24
- Earliest claimed: 2009-09-08
- Assignees: Hitachi Cable, Ltd.
- Applicants: Haruyuki Watanabe; Naoki Iso; Morihiko Ikegaya; Tomoyuki Ogawa
- Inventors: Haruyuki Watanabe; Naoki Iso; Morihiko Ikegaya; Tomoyuki Ogawa
- Web page: https://patentgrep.com/patent/US8542149B2

## CPC

- H01Q 21/08: the units being spaced along or adjacent to a rectilinear path {(waveguide fed H01Q21/0037)}
- H01Q 21/20: the units being spaced along or adjacent to a curvilinear path {(slotted waveguide arrays H01Q21/005; circularly or helically slotted waveguides H01Q21/0062)}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

An antenna according to the present invention comprises: a conductor plate with an axisymmetrical shape; a slot formed on the conductor plate; and a feeding point provided on the axisymmetrical axis of the conductor plate, in which the conductor plate is folded along two locations that are parallel to the axisymmetrical axis toward mutually different directions.

## Claims

### Claim 1

An antenna comprising:
a conductor plate with an axisymmetrical shape;
at least one slot formed on the conductor plate; and
a feeding point provided on an axisymmetrical axis of the conductor plate, wherein:
the conductor plate is folded along two locations which are parallel to the axisymmetrical axis toward mutually different directions;
the at least one slot has an axisymmetrical shape and an axisymmetrical axis that matches the axisymmetrical axis of the conductor plate;
the conductor plate has a horizontally rectangular shape oriented in the direction of the axisymmetrical axis;
a composite slot is formed on one part of the axisymmetrical axis of the conductor plate, the composite slot comprising a laterally-facing M-shaped slot and a trapezoid slot with a width gradually becoming larger to an open end and formed in a succession of the laterally-facing M-shaped slot; and
a rectangle slot is formed on the other part of the axisymmetrical axis of the conductor plate, thereby a slot boundary conductor portion being formed in the central portion on the axisymmetrical axis of the conductor plate between the composite slot and the rectangle slot.

### Claim 2 (depends on 1)

The antenna according to claim 1, wherein the rectangle slot comprises an elongated slot having an open end and a square slot formed in a succession of the elongated slot.

### Claim 3 (depends on 2)

The antenna according to claim 2, wherein
when λ1 is a wavelength of a radio wave at first design frequency ν1 with respect to two frequency bands used for the composite slot, 2d is a width of an upper base of the trapezoid slot, f is a length of the M-shaped slot along the direction of the axisymmetrical axis, and h is a length of each of two sides which connect the upper base and a lower base of the trapezoid slot; d, f, and h are to be adjusted so that a relationship of “d+f+h=λ1/3.7” can be established.

### Claim 4 (depends on 3)

The antenna according to claim 3, wherein
when λ2 is a wavelength of a radio wave at second design frequency ν2 with respect to two frequency bands used for the rectangle slot, g is a length of the elongated slot along the direction of the axisymmetrical axis, e is a width of the elongated slot, and b is a width of a side perpendicular to the axisymmetrical axis of the conductor plate; g, e, and b are to be adjusted so that a relationship of “g+(b−e)/2=λ2/3.1” can be established.

### Claim 5 (depends on 1)

The antenna according to claim 1, wherein the feeding point is provided to the rectangle slot.