Introduction
The antenna coil is a coil used as an antenna in magnetic field communication (low-frequency RFID), and low-frequency RFID uses electromagnetic induction to penetrate the receiving antenna and generate an induced voltage that enables the transmission of signals.
When the coil antenna of RFID enters the alternating magnetic field generated by the reader, the interaction between the antenna of the electronic tag and the antenna of the reader is similar to a transformer, and the coils of the two are equivalent to the primary coil and secondary coil of the transformer.
Some applications require a small profile and a certain working distance, such as electronic tags for animal identification. If the general coil has a small shape area, the mutual inductance of the antenna coil between the electronic tag and the reader is difficult to meet the actual use. Ferrite materials with high permeability are usually inserted inside the antenna coil of the electronic tag to increase the mutual inductance, thereby compensating for the reduction of the cross-sectional area of the coil.
Scope of Application
1. Wireless communication: coil antennas are widely used in wireless communication systems such as mobile phones, wireless LANs, and Bluetooth devices to realize signal transmission and reception.
2. Radio: Coil antennas are an important part of radio reception and transmission for applications such as listening to radio, communications, and radar
3. TV and satellite communication: Coil antenna is used to receive and transmit TV signals and satellite signals, realize the broadcast of TV programs and the transmission of satellite communications
4. Navigation and positioning: Coil antennas are used in global positioning systems (GPS) and navigation systems to receive and transmit navigation signals to achieve location positioning and navigation functions
5. Scientific research: Coil antennas are widely used in scientific research fields, such as astronomy, physics, etc., to receive and study electromagnetic waves and signals in the universe.
Product features
1. High efficiency: the coil antenna can convert electromagnetic waves into current, or convert current into electromagnetic waves, with high-efficiency energy conversion characteristics
2. Directionality: The coil antenna can control the directionality of radiation and received signals by changing the structure of the coil and the arrangement of wires, and improve the transmission distance and reception sensitivity of the signal
3. Multi-function: Coil antennas can be designed and manufactured according to different application needs, suitable for transmission and reception in different frequency ranges and signal types.
4. Small size: The coil structure of the coil antenna can be designed to be very compact, suitable for embedding and integration in electronic equipment, reducing the volume and weight of the device
5. Low cost: The manufacturing cost of coil antennas is relatively low, suitable for large-scale production and application
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