JPH02141102A - Antenna for automobile - Google Patents

Abstract

PURPOSE:To eliminate the need for any telescopic operation of an antenna in the case of car washing or putting its automobile into a garage and to reduce the cost of antenna manufacture by using an electric conductor installed to the lower part than the location of an under-body of the automobile as an antenna that catches a radio wave propagated through a path on ground (or ground path). CONSTITUTION:An antenna wire 3 of an antenna 1' of this invention is to be approached to ground 2 to the utmost to catch a radio wave propagated through the ground 2. The antenna is used through protection while being enclosed by a sheet 4 made of rubber or plastic. Moreover, the antenna 1' and the lead wire 2' are to be parted as much as possible from the car body and the length of the lead wire with respect to the car body is made as short as possible in order to prevent leakage of a radio wave to the car body (body: metallic body).

Description

[Detailed description of the invention] The present invention relates to an improvement of anti-1 for automobiles.

Conventionally, most common automobile antennas include those in which an extendable metal rod is protruded vertically or diagonally upward from the top of each part of the body, or in which the antenna is protruded upward along a front pillar. It can be stored inside the body either manually or electrically.

In recent years, antennas with electrical conductor wires glued or baked onto the rear window have also been layered.

The disadvantage of conventional antennas is that in the case of a telescopic rod-shaped antenna, the antenna must protrude above the top of the body when receiving data, and must be shortened and stored when parking or washing the car, which is cumbersome.

Additionally, rear window antennas are expensive and have very low sensitivity depending on the direction in which the radio waves arrive.

The present invention is designed to solve these drawbacks by using radio waves radiated from the antennas of broadcasting stations.

The conventional anti-no is a method that attempts to capture radio waves in the air.

Therefore, the idea was that the antenna should be extended above the roof of the polar capodei, but the antenna of the present invention is a complete reversal of the idea and is installed below the body, so that the radio waves transmitted through the ground (earth) can be The purpose is to capture.

Since the antenna of the present invention receives radio waves directly from the ground (a good conductor of electricity), it can receive signals well as long as there are no large buildings or the like in the direction from which the radio waves are coming.

The present invention will be explained with reference to the drawings. Figure 1 shows the antenna installed on a car. 1 in the figure. is the antenna 2 of the present invention; is the lead wire from the antenna to the radio; 3.
indicates a radio. FIG. 2 is a detailed explanatory diagram of the antenna portion.

1 in the figure. represents the bottom plate (underbody) of a car.

2. is the earth (ground); 3. is the antenna wire, 4. is a protective sheet for the antenna wire, 5. is a mounting tool, 6. is the lead wire to the radio. Since the antenna of the present invention captures radio waves traveling through the ground, it is best to place the antenna wire as close to the ground as possible (wrap the antenna in a rubber or plastic sheet to protect it before use).

Furthermore, in order to prevent radio waves from leaking into the car body (body: metal body), it is better to keep the antenna and lead wire as far away from the car body as possible, and to shorten the length of the lead wire in contact with the car body.

A feature of the antenna of the present invention is that there is no need to take the antenna in and out when washing the car or putting it in the garage, and it can remain fixed.

The production cost is also low, and the reception performance is almost comparable to that of a rod-shaped antenna.

Some embodiments of the antenna of the present invention are shown in FIG.

Figure 3 (1) shows an antenna with several shells arranged in parallel and connected at one end. (2) is an antenna in which several L-shaped conductors are arranged in parallel and connected at one end. (3) is an antenna with a number of conductors arranged radially from one point.

1 in the figure. is the antenna wire, 2. is a protective sheet, 3. Acupuncture
It is a line.

In experiments, antenna (3) had the best reception results.

4,

[Brief explanation of the drawing]

FIG. 1 shows the location of the vehicle and antenna installation. Figure 2 shows the details of the antenna mounting number on the car. FIG. 3 shows examples of various antennas. ``F''L

Claims (1)

[Claims] An automobile antenna characterized by using an electric conductor installed below the bottom plate (underbody) of the automobile as an antenna.