Antennas. Lecture 9. Introduction. An antenna is an electrical conductor or system of conductors. An antenna is a device whose function is to radiate electromagnetic energy or to intercept electromagnetic radiation Transmission - radiates electromagnetic energy into space
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transmit antennas. The polarization is the direction of the electric filed.
The increased power in one direction is at the expense of other directions. This gain is a power ratio and can be expressed as:
The actual amount of power received by an antenna through free space can be predicted by use of the following equation