Abstract: A compensating amplifier for an automobile antenna which is relatively short and free from interference from high frequency band television signals. The amplifier includes an inductive element in a primary serial tuning circuit of a multiple tuning circuit of an antenna which is connected in parallel to a condenser, and the parallel resonant frequency of a parallel circuit which is formed by the inductive element and the condenser is set at approximately the same resonant frequency as the resonant frequency of the antenna.

Abstract: A transmitting-receiving antenna for a vehicle including a fixture for fixing an ultra high frequency grounded antenna thereon. One end of the fixture is connected to a grounding point of a feeding section of the antenna and the other end is connected to an antenna mounting point of a vehicle body. The fixture is further constructed such that the length or distance between the grounding point of the antenna feeding section and the mounting point of the vehicle is set at 1/2 wave length in electric length.

Abstract: A three-wave common antenna for AM/FM and ultra high frequency waves combined in a single unit and mounted on vehicles including AM/FM antenna element mounted on a vehicle body at its base, a non-grounded type ultra high frequency antenna element disposed on top of the AM/FM antenna element such that the beam in a vertical plane thereof is close to the horizontal direction, a coaxial feeder cable for ultra high frequency which, along the AM/FM antenna element, is led into a vehicle body with one end thereof connected to the ultra high frequency antenna element, a characteristic compensating circuit connected to the AM/FM antenna element, and a feeder cable for AM/FM waves connected to the characteristic compensating circuit.

Abstract: An automobile antenna including a cylindrical housing for storing an antenna element, an antenna extension wire for extending and retracting the antenna element, cables connected to the antenna element at one end and the other end to communication equipment, and a cable chamber for storing therein a part of the cables. The cable chamber includes a wind-up shaft with a spiral fin formed around the outer circumference thereof, and the cables are wound along the spiral fin such that the coil diameter of the cables around the wind-up shaft is reduced and increased along the spiral fin upon the extension and retraction operations of the antenna element.

Abstract: An extensible rod antenna system for vehicles including an extensible rod antenna element formed of conductive rods, an upper fitting member and a lower cylindrical fitting member clamping and holding the rod antenna to a fitting hole located on the vehicle wall, a drainage outlet provided on the side wall of the lower fitting member, and a drainage pipe connected to the drainage outlet which discharges outside of the vehicle. This extensible rod antenna system is improved in that it drains water leaking through the space between the extensible rod antenna element and the upper portion fitting member.

Abstract: A multistage extensible rod antenna system including a plurality of conductive rods which have different diameters, respectively, and are connected in a freely slidable manner to each other. Each of the conductive rods is provided, along its inner circumferential wall of the upper end portion, with first and second stepped portions of different diameters. The first and second stepped portions hold a first collar and a second collar, respectively with an elastic sealing ring therebetween. The upper end face of each of the rods is formed into an engaging portion to keep the collar from slipping off. The multistage extensible rod antenna system thus structured creates less compressive force on the elastic sealing ring, prolonging the elasticity of the sealing ring and extending the service life of the multistage extensible rod antenna system.

Abstract: 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.

Abstract: 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.