Abstract: A slot antenna includes: power-supply points; and a slot, wherein in the slot antenna, the power-supply points are arranged while interposing the slot therebetween in a shorter direction of the slot, the slot being an opening that is provided in a metal sheet constituting an outer panel of a vehicle, and a width along the shorter direction of the slot is larger in each of both end parts of the slot than in an intermediate part of the slot in a longitudinal direction of the slot.

Abstract: A reception device according to an embodiment includes a main terminal, a sub-terminal, a demultiplexer, and a noise reducing unit. To the main terminal, a main signal is input. The main signal includes a broadcast wave. To the sub-terminal, a multiple signal is input. The multiple signal is obtained by multiplex a noise signal and a sub-signal including the broadcast wave. The demultiplexer demultiplexes the noise signal and the sub-signal from the multiple signal input from the sub-terminal. The noise reducing unit reduces a noise component included in the main signal by using the noise signal demultiplexed by the demultiplexer.

Abstract: A reception device according to an embodiment includes a main terminal, a sub-terminal, a demultiplexer, and a noise reducing unit. To the main terminal, a main signal is input. The main signal includes a broadcast wave. To the sub-terminal, a multiple signal is input. The multiple signal is obtained by multiplex a noise signal and a sub-signal including the broadcast wave. The demultiplexer demultiplexes the noise signal and the sub-signal from the multiple signal input from the sub-terminal. The noise reducing unit reduces a noise component included in the main signal by using the noise signal demultiplexed by the demultiplexer.

Abstract: A GPS loop antenna attached to the front windshield of a vehicle to receive a circularly polarized wave which is improved in reception performance, that is, a loop antenna comprised of a loop-shaped antenna conductor receiving a circularly polarized wave, feed terminals connected to the two ends of the antenna conductor, and a parasitic element positioned near the antenna conductor and made of a conductor independent of the antenna conductor, all arranged on a sheet-like transparent film, wherein a looping line conductor is arranged around the loop antenna on the film. It is sufficient if the total length of the line conductor is about three times the antenna conductor.

Abstract: A system improving reception performance of a terrestrial digital broadcast loop antenna attached to the front windshield of a vehicle, provided with at least one loop antenna with directivity in a direction parallel to the vehicle length direction and at least two loop antennas with directivity in a direction away from a direction parallel to the vehicle length direction, wherein these loop antennas are all set near conductors that make up the vehicle. The loop antenna with directivity in a direction parallel to the length direction of the vehicle is, viewed from a vehicle interior, set near the top left-right vicinity of the front window, while the two loop antennas with directivity in a direction away from the direction parallel to the vehicle length direction are positioned adjacent to this loop antenna.

Abstract: A GPS loop antenna attached to the front windshield of a vehicle to receive a circularly polarized wave which is improved in reception performance, that is, a loop antenna comprised of a loop-shaped antenna conductor receiving a circularly polarized wave, feed terminals connected to the two ends of the antenna conductor, and a parasitic element positioned near the antenna conductor and made of a conductor independent of the antenna conductor, all arranged on a sheet-like transparent film, wherein a looping line conductor is arranged around the loop antenna on the film. It is sufficient if the total length of the line conductor is about three times the antenna conductor.

Abstract: A loop antenna able to be mounted on the rear window of a vehicle provided with a defogger, that is, a loop antenna to be mounted on a rear window provided with a defogger having electrodes arranged in the vertical direction at the two ends and a plurality of electrical heating wires bridging the electrodes in the horizontal direction, wherein an antenna element forming a loop is made polygonal in shape, two power feed terminals of the loop antenna are provided at positions a predetermined distance away from the midpoint of the bottom of the antenna element, constituted by one side, in the vertical direction, a distance between the power feed terminals and bottom is formed smaller than the distance between adjoining electrical heating wires of the defogger, and the loop antenna is mounted on the rear window between the adjoining electrical heating wires. The polygonal shape may be a triangular shape.

Abstract: A loop antenna providing a reception performance equivalent to a patch antenna receiving a circularly polarized wave, simple in configuration, and kept low in cost, which forms a loop element and a parasitic element provided independently of this loop element on the same dielectric board to form an antenna element and sends or receives a circularly polarized wave by this antenna element, provides a metal plate parallel with or having a slight inclination with respect to the dielectric board, and sets this metal plate separated from the dielectric board by exactly a predetermined distance.

Abstract: When configuring a film antenna for receiving a circular polarized wave, at least one loop antenna is formed on a transparent plastic film and, at the same time, a non-powered element constituted by a wire-shaped conductor independent from the antenna conductor configuring the loop is arranged near this loop antenna. The non-powered element arranged on the side of the loop antenna is configured by a first part and a second part. The first part is made close to the loop antenna in a substantially parallel state. When a monopole antenna is used in place of the loop antenna, by combining this with a wire-shaped conductor orthogonal to this, it becomes possible to receive a circular polarized wave by a configuration providing a power transfer part between the two. It is also possible to configure a composite antenna by mounting another antenna on the transparent plastic film. This antenna can be used as an antenna of a navigation system.

Abstract: An object of the invention is to receive a weak signal with high sensitivity and reduce distortion and signal suppression when a strong interference signal exists. When a high-frequency signal received by an antenna is to be amplified by an antenna amplifier and when an interference wave of high field strength exists, a switch circuit is switched by an output switchover circuit from the output of an amplifier to a through-circuit. The through-circuit guides the high-frequency signal, directly to the output side without passing through the amplifier. When the switching operation of the switch circuit is performed based on low-frequency components which are highly correlated with distortion components due to intermodulation, the switching operation can be performed more adequately. Noises can be reduced by performing a smoothing process on the switching operation, and the use of an inverting amplifier can prevent occurrence of oscillation.

Abstract: A rod antenna with a good reception sensitivity using a conductive body of a vehicle or a heater element of a defogger as a reflector, that is, a rod antenna to be mounted at a conductive outside surface of a vehicle or at an outside surface of a rear window of a vehicle where heater elements of a defogger are arranged in parallel, provided with a rod-shaped antenna element provided with a predetermined length and a holding member comprised of a base member for holding the antenna element and an antenna support member, the holding member holding the antenna element so that it is separated a predetermined distance from the outside surface so that the outside surface becomes a reflector for the antenna element.

Abstract: A loop antenna able to be mounted on the rear window of a vehicle provided with a defogger, that is, a loop antenna to be mounted on a rear window provided with a defogger having electrodes arranged in the vertical direction at the two ends and a plurality of electrical heating wires bridging the electrodes in the horizontal direction, wherein an antenna element forming a loop is made polygonal in shape, two power feed terminals of the loop antenna are provided at positions a predetermined distance away from the midpoint of the bottom of the antenna element, constituted by one side, in the vertical direction, a distance between the power feed terminals and bottom is formed smaller than the distance between adjoining electrical heating wires of the defogger, and the loop antenna is mounted on the rear window between the adjoining electrical heating wires. The polygonal shape may be a triangular shape.

Abstract: A loop antenna providing a reception performance equivalent to a patch antenna receiving a circularly polarized wave, simple in configuration, and kept low in cost, which forms a loop element and a parasitic element provided independently of this loop element on the same dielectric board to form an antenna element and sends or receives a circularly polarized wave by this antenna element, provides a metal plate parallel with or having a slight inclination with respect to the dielectric board, and sets this metal plate separated from the dielectric board by exactly a predetermined distance.

Abstract: Film antennas which are stuck to a front glass of a vehicle is of such a structure that a plurality of antenna elements are formed on a film substrates. Amplifiers are disposed at pillar parts, and in the vicinity of power supply points to the antenna elements grounding to a high-frequency component by high-frequency grounding members are carried out. The high-frequency grounding members can be fixed simply by sticking them on a coating film etc. for covering an exterior part of a vehicle body, and a work of peeling the coating film becomes unnecessary, and therefore, it is possible to easily carry out a work which comes up with antenna installation to a vehicle. Grounding to a direct current component is carried out, away from the power supply points through DC earth in the vicinity of a selector and a receiver.

Abstract: When configuring a film antenna for receiving a circular polarized wave, at least one loop antenna is formed on a transparent plastic film and, at the same time, a non-powered element constituted by a wire-shaped conductor independent from the antenna conductor configuring the loop is arranged near this loop antenna. The non-powered element arranged on the side of the loop antenna is configured by a first part and a second part. The first part is made close to the loop antenna in a substantially parallel state. When a monopole antenna is used in place of the loop antenna, by combining this with a wire-shaped conductor orthogonal to this, it becomes possible to receive a circular polarized wave by a configuration providing a power transfer part between the two. It is also possible to configure a composite antenna by mounting another antenna on the transparent plastic film. This antenna can be used as an antenna of a navigation system.

Abstract: An object of the invention is to receive a weak signal with high sensitivity and reduce distortion and signal suppression when a strong interference signal exists. When a high-frequency signal received by an antenna is to be amplified by an antenna amplifier and when an interference wave of high field strength exists, a switch circuit is switched by an output switchover circuit from the output of an amplifier to a through-circuit. The through-circuit guides the high-frequency signal, directly to the output side without passing through the amplifier. When the switching operation of the switch circuit is performed based on low-frequency components which are highly correlated with distortion components due to intermodulation, the switching operation can be performed more adequately. Noises can be reduced by performing a smoothing process on the switching operation, and the use of an inverting amplifier can prevent occurrence of oscillation.

Abstract: Film antennas which are stuck to a front glass of a vehicle is of such a structure that a plurality of antenna elements are formed on a film substrates. Amplifiers are disposed at pillar parts, and in the vicinity of power supply points to the antenna elements grounding to a high-frequency component by high-frequency grounding members are carried out. The high-frequency grounding members can be fixed simply by sticking them on a coating film etc. for covering an exterior part of a vehicle body, and a work of peeling the coating film becomes unnecessary, and therefore, it is possible to easily carry out a work which comes up with antenna installation to a vehicle. Grounding to a direct current component is carried out, away from the power supply points through DC earth in the vicinity of a selector and a receiver.