- #1
shankar
- 17
- 1
what makes antenna to radiate,the basic principle...
Changing electric fields create magnetic fields. Changing magnetic fields create electric fields. You cannot jostle an electron around without producing SOME radiation.
To elaborate , electrons jostle against ions which are held in a fixed position in the crystal lattice of the conductor , causing the ions to vibrate and produce electric fields.
What?
Antennas work by converting electrical energy into electromagnetic waves, which can then be transmitted through the air or space. This conversion is made possible by the use of conductive materials, such as metal, that can create an oscillating electromagnetic field when an alternating electrical current is applied.
The radiating efficiency of an antenna can be affected by several factors, including the length and shape of the antenna, the frequency of the signal being transmitted, the material used to construct the antenna, and the presence of any nearby objects that may interfere with the radiation pattern.
The size of an antenna is directly related to its ability to radiate. Generally, the larger the antenna, the more efficient it is at radiating electromagnetic waves. This is because larger antennas have a longer physical length, allowing them to resonate at lower frequencies and radiate more energy.
Yes, antennas can be used for both transmitting and receiving signals. In fact, many antennas are designed to be bi-directional, meaning they can both transmit and receive electromagnetic waves. This is commonly seen in devices such as radios, TVs, and cell phones.
The design of an antenna plays a crucial role in its performance. Factors such as the shape, length, and material of the antenna can all affect its ability to radiate efficiently. Additionally, the design of the antenna can also determine its directional properties, which can impact the direction and range of the signals it transmits and receives.