Antenna for mobile wireless communications and portable-type wireless apparatus using the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsToshimitsu Matsuyoshi, Koichi Ogawa, Hiroshi Iwai
Life of this patent
Estimating the term…
Abstract
An antenna for mobile wireless communications in which two built-in antennas 101, 102 having a bisymmetric shape arranged in an axi-symmetric location of a ground plate 105 and, by feeding both of the antennas by using a balanced-to-unbalanced conversion circuit 106 at the same amplitude and the phase difference of 180 degrees, balanced operations are performed.
Claims32
An antenna for mobile wireless communications, comprising two antennas, each having a substantially (1) rectangular shape, (2) circular shape, or (3) polygonal shape having a single or a plurality of slits, wherein feeding phases for said two antennas are substantially different from each other,
- a ground plate bounded by a first perimeter and each antenna bounded by a second perimeter,
- wherein each antenna is arranged at a location above the ground plate to be substantially axi-symmetric to each other, and
- the second perimeter of each antenna is free-of contact with the first perimeter of the ground plate.
The antenna for wireless communications according to claim wherein slits are disposed with said metal plates at least at one place.
The antenna for mobile wireless communications according to claim wherein said portion is in close vicinity to a side opposite to each of respective sides where said metal plates arranged in said axi-symmetry stand face to face each other and, viewed from said portion, each said antenna is fed from the feeding point in close vicinity to a central portion of said metal plate.
An antenna for mobile wireless communications comprising two antennas, each having a substantially (1) rectangular shape, (2) circular shape, or (3) polygonal shape having a single or a plurality of slits, wherein feeding phases for said two antennas are substantially different from each other;
- wherein
- said two antennas are arranged in close vicinity to a ground plate, are of the same shape, and ambient lengths of the respective two antennas are either the same or different from each other;
- said two antennas are arranged in a location where they become substantially axi-symmetric;
- feeding points are connected to each antenna, and each of said two antennas includes metal plates electrically short-circuited with said ground plate;
- said slits are disposed in said metal plates at least at one place;
- and
- a switching circuit capable of electrically connecting an open end of the slit is connected to said slit.
An antenna for mobile wireless communications comprising:
- a conductive ground plate of a substantially rectangular shape;
- a dielectric substrate arranged on said conductive ground plate in close vicinity to an end portion side of both end portions using a center of the longitudinal conductive ground plate as a reference;
- and
- two antenna elements of a substantially rectangular shape formed on said dielectric substrate;
- wherein each of said two antennas has a feeding point and at least one through-hole and is electrically short-circuited with said conductive ground plate via the through-hole, and
- the difference of feeding phases for said two antenna elements is substantially 180 degrees.
An antenna for mobile wireless communications comprising:
- a conductive ground plate of a substantially rectangular shape;
- a dielectric substrate arranged on said conductive ground plate in close vicinity to an end portion side of both end portions using a center of the longitudinal conductive ground plate as a reference;
- and
- two antenna elements of a substantially rectangular shape formed on said dielectric substrate;
- wherein each of said two antennas has a feeding point and at least one through-hole and is electrically short-circuited with said conductive ground plate via the through-hole, and
- said two antenna elements are substantially of an axi-symmetric structure.
An antenna for mobile wireless communications comprising:
- a conductive ground plate of a substantially rectangular shape;
- dielectric substrate arranged on said conductive ground plate in close vicinity to an end portion side of both end portions using a center of the longitudinal conductive ground plate as a reference;
- and
- two antenna elements of a substantially rectangular shape formed on said dielectric substrate;
- wherein each of said two antennas has a feeding point and at least one through-hole and is electrically short-circuited with said conductive ground plate via The through-hole, and
- each of said feeding point and through-hole are arranged at a location where either of them becomes axi-symmetric.
An antenna for mobile wireless communications comprising two antennas, each having a substantially (1) rectangular shape, (2) circular shape, or (3) polygonal shape having a single on a plurality of slits, wherein feeding phases for said two antennas are substantially different from each other;
- said two antennas are arranged in close vicinity to a ground plate
- feeding points are connected to each antenna, and each of said two antennas includes a metal plate electrically short-circuited with said ground plate;
- said metal plate is of a rectangular shape and each portion of said two metal plates arranged in a substantially axi-symmetric location is electrically short-circuited with said ground plate in close vicinity to an outer peripheral portion of said metal plate;
- and
- said two antennas are arranged by inclining to one of both sides with a central portion of said ground plate as a reference;
- and said portion and feeding point are arranged in close vicinity to said one side.
An antenna for mobile wireless communications comprising two antennas, each having a substantially (1) rectangular shape, (2) circular shape, or (3) polygonal shape having a single or a plurality of slits, wherein feeding phases for said two antennas are substantially different from each other;
- said two antennas are arranged in close vicinity to a ground plate
- feeding points are connected to each antenna, and each of said two antennas includes a metal plate electrically short-circuited with said ground plate;
- said metal plate is of a rectangular shape and each portion of said two metal plates arranged in a substantially axi-symmetric location is electrically short-circuited with said ground plate in close vicinity to an outer peripheral portion of said metal plate;
- and
- said two antennas are formed on a dielectric.
Dependencies are inferred from the claim text.