Harada Kogyo Kabushiki Kaisha

Harada Industry Co., Ltd.

Takuji Harada

Takashi Kido

Moriyoshi Kawasaki

Shigeru Egashira

Eiji Tezuka

Mitsuo Harada

A broad band mobile telephone antenna comprises a first conductive circular plate and a second conductive circular plate. The first plate is located above and in parallel with the second plate. The diameter of the second plate is equal to or larger than that of the first plate. The second plate is used as a ground plate, is attached on a body of an automobile. A short-circuit rod, for matching an impedance between the first plate used as an antenna and a coaxial feeder cable for the antenna, is connected between the first and second plates. An upper end of a core rod is connected to the first plate at the substantial center thereof. A lower end of the core rod is extended toward an opening formed in the substantial center of the second plate. The opening is connected to a connector which is placed inside the automobile through an opening formed in the body. The connector connects the core rod and the coaxial cable which is connected to a transmitter/receiver of a mobile telephone system. The inner conductive wire of the coaxial cable is connected to the core rod and the outer conductive sheath is connected to the ground potential.

Broad band mobile telephone antenna

An automobile loop antenna including a conductive loop and a coaxial cable. One end of the loop is connected to a core conductor of the coaxial cable, and the other end of the loop is connected to an outer conductor of the coaxial cable with a low-capacitance capacitor in between. A part of the outer conductor of the coaxial cable is connected to a metal part of an automobile so that the end of the coaxial cable is spaced 5 to 50 cm from the metal part.

Automobile loop antenna

In a micro-strip antenna comprising a radiating conductor and a grounding conductor which are installed on either side of a dielectric, a plate-form conductor is attached to the radiating conductor at a position which is roughly at point where an extension line extended from a line, that connects the center of gravity of the radiating conductor and a feeding point, intersects an edge of the radiating conductor. The plate-form conductor is attached also at a position which is rotated 90 degrees about the center of gravity from the above-described position. In addition, a portion of the plate-form conductor is set to project from the edge of the radiating conductor. In this way, the center frequency of the micro-strip antenna can easily be corrected during the manufacturing process of the micro-strip antenna.

Micro-strip antenna

A capacitive antenna coupling circuit including a counter electrode which is connected to one end of at least one meandering conductor and a peripheral conductor connected to the other end of the meandering conductor which forms a capacitor between itself and the counter electrode.

Antenna coupling circuit using capacitive coupling

A flat-plate patch antenna including a ground plate, a radiating element provided on the ground plate with a feeder cable connected thereto, and a wave guide element provided to face the radiating element with a space in between, the wave guide element being movable parallel to the ground plate.

Flat-plate patch antenna

A plane antenna for automobiles including a peripheral conducting surface, a first inner conducting surface provided in the peripheral conducting surface with a space in between, a second inner conducting surface provided in the first inner conducting surface with a space in between. A core conductor of a first coaxial line is connected to the first inner conducting surface and an outer skin of the first coaxial line is connected to the peripheral conducting surface, and a core conductor of a second coaxial line is connected to the second inner conducting surface and an outer skin of the second coaxial line is connected to the first inner conducting surface. The second coaxial line can be divided into two sections so that these sections are inductively connected to each other by coils.

Dual slot planar mobile antenna fed with coaxial cables

An FM wave antenna including a coaxial cable, a parallel conductor which are provided parallel to a metal conductor such as a vehicle body and an amplifier provided between the coaxial cable and the parallel conductor. The coaxial cable is made up of a central core and inductive outer sheath and one end of the inductive outer sheath is connected to the metal conductor, and one end of the parallel conductor is also connected to the metal conductor. The amplifier amplifies signals from the parallel conductor and inductive outer sheath of the coaxial cable and outputs amplified signals to the central core of the coaxial cable.

Amplified FM antenna with parallel radiator and ground plane

A rod antenna control system for automobiles wherein electric current is supplied continuously to a motor which pushes up an antenna motor when a current below a predetermined value is flowing to the motor, and the current is supplied intermittently to the motor when a current above a predetermined value flows to the motor, and whether or not the electric current is over or below the predetermined value is determined by integrating the motor current for certain period of time and comparing such integrated value to the predetermined value.

Rod antenna control system for automobiles

An automobile antenna control device generating a reset pulse which starts the operation of a microcomputer. The pulse is generated when an automobile radio power source is switched from 'off' to 'on,' or when the power source is switched from 'on' to 'off,' so that a so-called runaway of the microcomputer can be prevented. The power source is connected to an input port of the microcomputer; the antenna is extended when the power source is 'on,' and is retracted when the power source is 'off.' The extending or retracting action of the antenna is stopped when the starter power source of the master key switch of the automobile is 'on.'

Reset circuit for an automobile antenna control device

Inductance coupling type transmission channel couplers mounted on either side of an insulator such as window glass of a vehicle including a pair of resonator, each including a cylindrical outer conductor and a helical conductor coaxially provided in the outer conductor with one end connected thereto. The resonant frequency of the tuning inductance circuit thus constructed is set at 1/3 of an objective frequency, and the ratio between the inner diameter and the outer diameter of the helical conductor is set at 1.1-2.0.

Transmission channel coupler for antenna

A CATV system for a guest facility such as a hotel including a monitor installed in each room of the facility, an activator for activating the monitor with a signal sent from the front office of the facility, a sensor for detecting a guest who has entered the room and comes close to the monitor, and a display controller for displaying guest information such as a hotel guide on the monitor when the sensor detects the presence of the guest proximity of the monitor.

Cable TV system for guest facilities

A cooking appliance having a weight measuring device for measuring the weight of a container and the contents thereof, a storing device for memorizing the weight of the container and the content data, a weight variation detector for detecting the weight lost from the container and contents thereof at a specified ratio or by a specified weight from the weight of the container and contents thereof at the start of cooking, and a heating operation stopping device for stopping the heating of the container and contents thereof when the weight thereof is reduced to a specified ratio or by a specified weight from the weight of container and contents thereof at the start of cooking.

Cooking appliance

A transmission channel coupler for an antenna including two resonators, each resonator being formed with a helical conductor and an outer conductor which is disposed outside of the helical conductor by sharing the same axis with the helical conductor. One end of the helical conductor is electrically connected to the inner wall of the outer conductor, and the other end of the helical conductor is connected to a printed circuit board mounted at the end of the outer conductor so that the helical conductor is positioned inside the outer conductor. The resonators are coaxially mounted on the either side of a glass such as the rear window of a car, window of a building, etc. By means of the structure above, high frequency signals are transmitted through an insulating material, that is, the glass, without damaging it. Also, the coupler can be manufactured small in size and provides excellent frequency characteristics with less transmission loss.

A transmission channel coupler for an antenna including a first resonator and a second resonator. Each resonator has a helical conductor and an outer conductor which is disposed outside of the helical conductor by sharing the same axis with the helical conductor. One end of the helical conductor is electrically connected to the inner wall of the outer conductor, and the other end of the helical conductor is positioned within the area defined by an end face of the outer conductor. The first and second resonators are coaxially mounted on the either side of a glass such as rear window of a car, window of a building, etc. By means of the structure above, high frequency signals are transmitted through an insulating material, that is, the glass, without damaging it. Also, the coupler can be manufactured small in size and provides excellent frequency characteristics with less transmission loss.

Growing community of inventors

Kanagawa, Japan

Takuji Harada