What does the inside of a rubber antenna look like?

Reveal the internal structure of the rubber sleeve antenna！

What is the most common antenna in life? That is the rubber antenna. It is said that this type of antenna is also recognized as the most convenient antenna and the most useless antenna in the world. But to be honest, all antennas have to make compromises in some aspects. After all, antennas need to play different roles in different environments and situations, and there will definitely be advantages and disadvantages... The rubber antenna at least shortens the physical size of the antenna and facilitates portable use.

The definition of this antenna in the encyclopedia is as follows: This is a shortened monopole antenna that uses a spirally wound coil for inductance and is wrapped with a layer of rubber or plastic.

Let's talk about the internal structure of this rubber antenna: the metal wire is bent into a spiral shape at a certain interval, and the coil is supported along the axial direction of the spiral with an insulating material support rod. One end of the spiral is connected to the output end of the transmitter, and the other end is open, which constitutes a spiral antenna. The product is made of 1.2mm diameter carbon steel wire, which is wound on a common lathe into several turns of spiral with an average diameter of 1cm, and supported by a thermoformed polypropylene core rod with a plum blossom-shaped cross section. The outside of the spiral is sealed with a rubber tube to prevent rain erosion.