Fin antenna device of automobile radio

Abstract

The invention relates to a manch type antenna device of a car radio which is used to receive at least one wireless electric band signal before it is connected with a wireless electric receiving circuit. It comprises a manch type external cover, an AM antenna, a signal amplifying circuit plate, a FM vibrator antenna circuit positioned on the signal amplifying circuit plate and a mental base, wherein the AM antenna and the FM vibrator antenna circuit are designed separately; the FM vibrator antenna circuit uses a plurality of inducers to form the vibrator circuit and can connect the mental base to reinforce the signal receiving ability of the FM vibrator antenna circuit.

Description

technical field [0001] The invention relates to a fin antenna device for a car radio, in particular to a fin antenna device used on a car AM / FM radio, which can be installed on the roof of the car and has a receiving antenna for enhancing the radio frequency signal of the radio device. Background technique [0002] By the way, due to the advancement of radio technology, many products are gradually becoming wireless. The most troublesome thing in radio technology is the design of the antenna. The antenna is related to the frequency, direction and intensity of the radio wave. Generally, the design of the antenna is based on the radio wave. To calculate 1 / 4λ, a long metal rod shape with a certain length is designed, which takes up a lot of space. Therefore, the AM and FM antennas on the car are designed to be long rod-shaped telescopic, and AM and FM share one antenna. It stretches out when it is closed, and retracts when it is closed. However, after a long time of use, it wil...

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Problems solved by technology

[0002] By the way, due to the advancement of radio technology, many products are gradually becoming wireless. The most troublesome thing in radio technology is the design of the antenna. The antenna is related to the frequency, direction and intensity of the radio wave. Generally, the design of the antenna is based on the radio wave. To calculate 1 / 4λ, a long metal rod shape with a certain length is designed, which takes up a lot of space. Therefore, the AM and FM antennas on the car are designed to be long rod-shaped telescopic, and AM and FM share one antenna. It is stretched out when it is closed and retracted when it is closed. However, after a long time of use, it will fail and cannot be retracted, which is quite inconvenient.

[0003] Therefore, some companies have developed a helical antenna, which bends a long metal rod into a helical shape, but the radio reception of the helical antenna is not ideal, so there is a so-called glass antenna design, which is attached to the car glass with a soft conductive material This kind of glass antenna is also an antenna design shared by AM and FM, but the material is quite expensive

There are also many planar antennas that use a special curvature on the printed circuit board. This kind of planar antenna has a big disadvantage that it cannot be close to substances with metal surfaces, because metal will absorb radio waves, and the car shell is metal. so that the planar antenna cannot receive the signal

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