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An Introduction to Ferrite Rod Antenna

Ferrite rod antenna is a small magnetic loop antenna used in AM broadcast transistor radios for medium & long waveband reception and RFID applications. It is designed with a rod or bar made of ferrites and includes a coil wound around the ferrite rod with the help of a variable tuning capacitor in the radio circuitry.<br><br>https://www.cosmoferrites.com/news-events/an-introduction-to-ferrite-rod-antenna

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An Introduction to Ferrite Rod Antenna

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  1. Overview Ferrite rod antennas are tiny magnetic loop antennas that are utilised in AM broadcast transistor radios for medium and long waveband reception as well as RFID applications. It is constructed using a ferrites rod or bar and contains a coil coiled around the ferrite rod using a variable tuning capacitor in the radio electronics.

  2. How does Ferrite Rod Antenna work? Its performance and frequency responsiveness are limited due to losses in the ferrite core. As a result, the antenna functions at frequencies ranging from 2 to 3 MHz. A ferrite rod antenna is mostly used to receive lower frequency transmissions ranging from 50hz to 50khz. It functions as transmitting antennas for applications that require minimal power and efficiency. If the power levels are high, the ferrite rod may experience heat dissipation problems. The tiny size and convenience, on the other hand, contribute to its advantages and raise its demand for RFID applications.

  3. Design The antenna may also be constructed using other parameter combinations. As a result, a shorter and broader coil with more turns can provide the same output voltage as a longer and thinner coil with fewer turns and greater magnetic permeability. Because each arrangement will employ various materials, the price may vary. The major goal is to deliver a target output voltage and power while keeping restrictions like physical size and Q factor in mind. This might assist you in determining the optimum configuration that has the lowest cost and meets all design limitations.

  4. Ferrite Rod Antenna Parameters The two most significant characteristics of a ferrite rod antenna are the tuned circuit's 'Q' and the radiation resistance. These characteristics govern where the antennas can be used as well as the design of the circuits that utilise them.

  5. Importance of The ‘Q’ Parameter The 'Q' or Quality parameter of the circuit design in which the ferrite rod antenna coil is positioned is a significant issue. To perform efficiently, the circuit must have a high Q at the frequencies where the antenna would operate. If the frequency is a few hundred kHz, a medium permeability material will be put in the ferrite rod antenna to assist maintain a Q value of 1000 or so. At this point, the antenna must be tuned to function at a higher frequency. Because the magnetic circuit is open, the Q value of the ferrite core in the rod will likewise be bigger than the material value. This number is proportional to the maximum operational distance.

  6. How is it useful for Radiation Resistance? If the antenna is not ferrite, it has a small loop that is less than a wavelength in length and has a low radiation resistance. As a result, the losses caused by wire resistance would be exceedingly large. To address this, a ferrite core is put in the coil to boost the radiation resistance of the ferrite rod antenna. This lowers the radiation resistance and reduces resistive losses caused by the wire.

  7. Continue… While the ferrite rod is helpful for increasing radiation resistance in antennas, it introduces additional losses. The energy necessary to alter the magnetic alignment in the granular structure of the ferrite core is absorbed by the ferrite. If the frequency is increased, the number of changes increases, and hence the losses increase. As a result, ferrite rod antennas are only employed at low frequencies and not at higher frequencies.

  8. Conclusion In terms of efficiency, frequency, and tuning, a ferrite rod antenna is a solid choice. Their popularity and demand as RF antennas for portable radios is increasing worldwide. Alisha Coils & Transformers designs Ferrite Rod Antennas using quality and new technology to give our customers with customised solutions. Our strength is in-house ferrite core manufacturing, which allows us to assure product quality and timely delivery.

  9. Thank You If you need more assistance, you can feel free to connect with our experts who will take you through our wide range of ferrite products available for several applications. Contact us to learn more. sales@cosmoferrites.com www.cosmoferrites.com +91-11 4939 8800

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