Antenna coil
The shape of the inductor is divided into different styles according to different products and occasions, mainly used for transmitting and receiving electromagnetic signals, the inductance value of the low-frequency antenna is relatively small, and the relative application of the product also tends to be conventional. Such as credit card machine, access control system, etc.
Principle of antenna coil:
An antenna hollow inductor is a converter that converts a traveling wave propagating on a transmission line into an electromagnetic wave propagating in an unbounded medium (usually free space), or vice versa. A part of a radio device used to transmit or receive electromagnetic waves. Engineering systems such as radio communication, radio, television, radar, navigation, electronic countermeasures, remote sensing, radio astronomy, etc., which use electromagnetic waves to transmit information, all rely on antennas to work. In addition, in terms of transmitting energy with electromagnetic waves, non-signal energy radiation also requires an antenna. General antennas are reversible, that is, the same antenna can be used as both a transmitting antenna and a receiving antenna. The basic characteristic parameters of the same antenna as transmitting or receiving are the same. This is the reciprocity theorem for antennas.
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