摘要:
A portable telephone includes a metal substrate, a shield box, a monopole antenna and a feed unit. The surface of the metal substrate includes a conductive metal layer. The shield box covers a radio transmitter-receiver unit provided on the metal substrate to electromagnetically shield the radio transmitter-receiver unit, and has conductivity. The monopole antenna extends in a predetermined direction, and has an electrical length of (&lgr;/2)×N (N is an integer). The feed unit is provided at the metal substrate so as to be apart from the shield box in the extending direction of the monopole antenna. The feed unit includes a matching circuit.
摘要:
An antenna element includes a plate antenna which is substantially equivalent to a series resonant circuit, and a monopole antenna which is connected to the plate antenna and is substantially equivalent to a parallel resonant circuit.
摘要:
The antenna device includes a linear antenna (2, 11, 15), a fixing member (7), and a power feed member (10, 12, 14). The fixing member (7) is formed from a dielectric, and holds a portion (11) of the antenna. The power feed member (12, 10) contacts the antenna (11, 15). The fixing member (7) holds the antenna (2, 11, 15) in a movable manner.
摘要:
An antenna device (3a) includes a substrate (11) and an antenna (21) provided on the substrate (11) and having an electrical length of (&lgr;/2)×A (A is an integer). The antenna (21) includes a plate antenna (21b) positioned at a portion where an electrical length from an end portion (21d) is approximately &lgr;/4+(&lgr;/2)×B (B is an integer), and a meander line antenna (21a, 21c) connected to the plate antenna (21b).
摘要:
An antenna device includes: a conductive board (3) having one end portion and the other end portion opposite the one end portion; a flat plate antenna(4, 18a, 18b, 19) mounted on the board (3) with a dielectric interposing therebetween wherein when feeding a current thereto to excite, a current also flows in said board (3); a first current direction change means (5a, 6, 6a, 6c, 7, 7a, 7c, 14a, 17a, 17c, 21a, 22a, 22b, 24a) changing a direction of the current flowing in the board (3) to a first direction when exciting the antenna (4, 18a, 18b, 19) and located on said one end portion of the board (3); and a second current direction change means (5b, 6, 6b, 6d, 7, 7b, 7d, 14b, 17b, 17d, 21b, 22c, 22d, 24b) changing a direction of the current flowing in the board (3) to a second direction different from the first direction when exciting said antenna (4, 18a, 18b, 19) and located on the other end portion of the board (3).
摘要:
A portable telephone including a main unit case and an antenna element. The antenna element includes a meander line antenna as the first antenna unit arranged within the main unit case and formed to extend in one direction, and a second antenna unit extending substantially orthogonal to the extending direction of the meander line antenna, and arranged projectable from the main unit case, having an electrical length of approximately (&lgr;/2)×A (A is an integer), and coupled to the meander line antenna.
摘要:
A slide lever (6) is provided to a cabinet (2) of portable radio equipment, and an antenna (3) formed by nickel elastic alloy is held by a holding member (5). A lower portion of the antenna engages with an engaging portion (61) of slide lever (6), and by sliding slide lever (6), the lower portion of antenna (3) is bent at engaging portion (61) such that the entire antenna is inclined in a vertical direction by a desired angle, thereby reducing loss due to nonconformity of polarization with respect to an antenna of a base station.
摘要:
An array antenna includes systematically arranged linear antennas belonging to two or more groups consisting of linear antennas operating at respective frequencies, so that the array antenna can operate at two or more operating frequencies. Each linear antenna that operates at a relatively low frequency includes antenna elements having cranks formed thereon.
摘要:
A two-frequency antenna includes feeders 7a and 7b, inner radiation elements 2a and 2b connected to the feeders, outer radiation elements 3a and 3b, and inductors 4a and 4b that are formed in gaps 6a and 6b between the inner radiation elements and the outer radiation elements to connect the two radiation elements, which are printed on the first surface and on the second surface of the dielectric board 1, respectively.
摘要:
There is provided a small-sized and simplified horizontally polarized antenna apparatus which forms an omnidirectional pattern in the horizontal plane. The radiation field in the horizontal plane becomes continuous and a horizontally polarized omnidirectional radiation pattern can be obtained in the horizontal plane by forming radiation slots at opposing positions on a grounded hollow body and exciting the slots out of phase.