Abstract: In a dual-band antenna, an insulating base is formed on a support board having a ground conductor. A first radiation conductor plate for a low band has first and second divided conductor plates for covering an opening end of the insulating base. A feed conductor plate and a first short-circuiting conductor plate are continuously formed with the first divided conductor plates. A second short-circuiting conductor plate is continuously formed with the second divided conductor plate. A second radiation conductor plate for a high band is connected with the feed conductor plate. The feed conductor plate and the second short-circuiting conductor plate are electromagnetically coupled. The second divided conductor plate has a bending flap, and the bending flap is engaged with the insulating base. The bending flap has a cutout or cutaway portion for finely adjusting the resonant frequency.

Abstract: An antenna device includes a ground conductor plate, and a radiating conductor plate made of a metal plate, which is spaced from the ground conductor plate. The radiating conductor plate is provided with adjusting means for adjusting the electrical length. Thus, the correction of the electrical lengths can be made even if there is a difference between the electrical lengths of the radiating conductor plate caused by assembling errors, etc. In addition, when the antenna device is used in a state in which it is connected to external equipment, the adjusting means allows the adjustment of the electrical lengths of the radiating conductor plate even if the electrical lengths of the radiating conductor plate are subjected to the electrical influence from the electrical equipment and its surrounding environment.

Abstract: First and second radiating conductors are concentrically formed on a top surface of a dielectric substrate, and a grounding conductor is formed on a bottom surface of the dielectric substrate. A feeding pin is connected to a power feeding point of the first radiating conductor. Shorting pins are connected to an inner circumferential portion of the second radiating conductor to be shorted by the grounding conductor. An interval between the radiating conductors allows the first and second radiating conductors to be electromagnetically coupled with each other. When the first radiating conductor is excited at a frequency fH by direct feeding from the feeding pin, the second radiating conductor is fed by the coupling, so that it is excited at a frequency fL lower than the frequency fH.

Abstract: A dual band antenna contains a first radiating conductor plate disposed substantially parallel to a grounding conductor, a power-supplying conductor plate extending downwards from the first radiating conductor plate, a connecting conductor plate for connecting the first radiating conductor plate to the grounding conductor, a second radiating conductor plate provided upright beneath the first radiating conductor plate and having a substantially wedge-shaped, elastically deformable portion, and a synthetic resin adjusting screw threaded to the first radiating conductor plate for depressing the top portion of the second radiating conductor plate downwards. The first and second radiating conductor plates resonate at first and second frequencies respectively (with f2>f1). The gap between the second radiating conductor plate and the first radiating conductor plate can be changed.

Abstract: An antenna device includes a ground conductor plate, and a radiating conductor plate made of a metal plate, which is spaced from the ground conductor plate. The radiating conductor plate is provided with adjusting means for adjusting the electrical length. Thus, the correction of the electrical lengths can be made even if there is a difference between the electrical lengths of the radiating conductor plate caused by assembling errors, etc. In addition, when the antenna device is used in a state in which it is connected to external equipment, the adjusting means allows the adjustment of the electrical lengths of the radiating conductor plate even if the electrical lengths of the radiating conductor plate are subjected to the electrical influence from the electrical equipment and its surrounding environment.

Abstract: At least a part of mount pieces of a shield casing is arranged in locations adjacent to sides of a dielectric board to positionally restrain an antenna element. Even when torque with a feeding pin as an axis of rotation acts on the antenna element, the antenna element does not move in a direction of rotation.

Abstract: A patch antenna includes a dielectric substrate having a through-hole, a patch electrode on the dielectric substrate, and a feed pin inserted in the through-hole. A head of the feed pin is soldered to the patch electrode. The bottom surface of the head of the feed pin has projections for generating a clearance between the bottom surface of the head and the opposing surface of the patch electrode, which is filled with a solder. The solder can function as a cushion that prevents a thermal contraction or a thermal expansion of the head of the feed pin to directly affect the dielectric substrate.

Abstract: In a dual-band antenna, an insulating base is formed on a support board having a ground conductor. A first radiation conductor plate for a low band has first and second divided conductor plates for covering an opening end of the insulating base. A feed conductor plate and a first short-circuiting conductor plate are continuously formed with the first divided conductor plates. A second short-circuiting conductor plate is continuously formed with the second divided conductor plate. A second radiation conductor plate for a high band is connected with the feed conductor plate. The feed conductor plate and the second short-circuiting conductor plate are electromagnetically coupled. The second divided conductor plate has a bending flap, and the bending flap is engaged with the insulating base. The bending flap has a cutout or cutaway portion for finely adjusting the resonant frequency.

Abstract: A dual band antenna is provided which assures enhanced sensitivity in the horizontal direction for two kinds of frequency bands, high frequency band and low frequency band. The dual band antenna 10 comprises a first radiating conductor plate 12 disposed substantially parallel to a grounding conductor 11, a power-supplying conductor plate 13 extending downwards from the first radiating conductor plate 12, a connecting conductor plate 14 for connecting the first radiating conductor plate 12 to the grounding conductor 11, a second radiating conductor plate 15 provided upright beneath the first radiating conductor plate 12 and having a substantially wedge-shaped, elastically deformable portion 15a, and a synthetic resin adjusting screw 16 threaded to the first radiating conductor plate 12 for depressing the top portion of the second radiating conductor plate 15 downwards.

Abstract: A patch antenna includes a dielectric substrate having a through-hole, a patch electrode on the dielectric substrate, and a feed pin inserted in the through-hole. A head of the feed pin is soldered to the patch electrode. The bottom surface of the head of the feed pin has projections for generating a clearance between the bottom surface of the head and the opposing surface of the patch electrode, which is filled with a solder. The solder can function as a cushion that prevents a thermal contraction or a thermal expansion of the head of the feed pin to directly affect the dielectric substrate.

Abstract: At least a part of mount pieces of a shield casing is arranged in locations adjacent to sides of a dielectric board to positionally restrain an antenna element. Therefore, even when torque with a feeding pin as an axis of rotation acts on the antenna element, the antenna element does not fluctuate in a direction of rotation, whereby stability in antenna characteristics is achieved to improve reliability, and stress such as torsion or the like acting on the feeding pin and its soldered portions is greatly decreased to enable achieving lengthening of life.

Abstract: A surface mount circularly polarized wave antenna which includes a substrate made of an insulating material and having a first main face, a second main face, and at least one side face extending between the first main face and second main face; a first ground electrode disposed on the first main face of the substrate; a radiation electrode disposed on the second main face; a feeding electrode having a strip shape and extending from the first main face of the substrate, on the one side face of the substrate, and toward the second main face, one edge of the feeding electrode being positioned near to one side of the radiation electrode; and a second ground electrode disposed on the one side face of the substrate where the feeding electrode is disposed, and electrically conductively isolated from the feeding electrode and electrically conductively connected to the first ground electrode; and a degeneracy separation element provided in relation to the radiation electrode for causing radiation of a circularly polar

Abstract: A surface mount antenna having a substrate made of at least one of a dielectric material and a magnetic material, the substrate having a substantially rectangular prism shape and including a first major surface and a second major surface; a ground electrode disposed on the first major surface of the substrate; a radiation electrode having a strip shape disposed at least on the second major surface of the substrate; a feeding electrode disposed on at least one surface of the substrate; and the radiation electrode including an open end portion and a plurality of grounded end portions, the open end portion being arranged close to the feeding electrode with a gap therebetween on the substrate, and the plurality of the grounded end portions being connected to the ground electrode on different portions of the substrate, respectively. The above described antenna has an enhanced gain without changes in size.

Abstract: The invention provides a low-profile circular-polarization antenna that can be implemented at a reduced mounting cost of components. Two linear-polarization surface-mount antennas are mounted on a mounting substrate such that their planes of polarization are perpendicular to each other in the direction normal to the mounting surface, and an amplification circuit, a shield case for covering the circuit, and a phase circuit for sending signals having the same amplitude and a phase difference of 90 degrees to the two surface-mount antennas are provided on the same mounting surface.