- #1
The loop is closed in the AC (RF) case as well, when you consider the parasitic capacitance between the two poles of a dipole.Bobbywhy said:[DC] requires a closed loop for current to flow. [AC], at radio frequencies (R.F.) driving an antenna, for example, does not. That R.F. current "goes back and forth" or "up and down" inside the antenna, depending on the orientation of the antenna.
dexterdev said:Hi pf,
I thought that current will flow in closed loops only , but the figure attached shows working of antenna with current in open circuit, but how?
-Devanand T
Sections two and three in Antennas for Non-Specialists should shed some light on your question. Check it out!dexterdev said:Any references, books , links etc...please
Current flows through a circuit when there is a complete path for the electrons to move along. When a circuit is closed, it means that there are no gaps or breaks in the path for the electrons to travel through. This allows for a continuous flow of current.
Yes, current can flow in the case of antennas without a closed circuit. Antennas use electromagnetic waves to transmit and receive signals, which do not require a complete circuit. The electromagnetic waves create alternating electric and magnetic fields, which can induce a current in the antenna without the need for a closed circuit.
In other electronic devices, a closed circuit is necessary for the flow of current because the electrons need a continuous path to follow in order to power the device. Antennas, on the other hand, do not require a continuous flow of current to function. Instead, they use the electromagnetic waves to transmit and receive information.
The absence of a closed circuit does not impact the function of an antenna. In fact, antennas rely on the ability to transmit and receive electromagnetic waves without the need for a closed circuit. The absence of a closed circuit actually allows for more flexibility in the design and function of antennas.
No, there are no risks or dangers associated with current flowing without a closed circuit in antennas. The electromagnetic waves used by antennas are not harmful to humans and do not pose any safety risks. In fact, antennas are a crucial component in many communication systems and are designed to function safely without the need for a closed circuit.