Antennas can work with multiple frequency ranges within the antennas intended purpose. Longer antennas are designed to pick up waves that operate at lower frequencies, while shorter antennas are designed to pick up waves that operate at higher frequencies. The length of the antenna determines the size of the electromagnetic waves it can send and/or receive. The length, shape, and separation, of the two conductive elements is vital to how the antenna works. A dipole is made up of two identical conductive elements, like metal wires or rods. The word “di-pole” is made up of the prefix “di-,” from the Greek word meaning “two,” and “pole,” which is quite self-explanatory. The following explanation may get a bit technical, but we’ll try to keep it as simple as possible. Most omnidirectional antennas work in the same way as a dipole, so to understand how they work, we’ll be discussing how a basic dipole works. A common example of a dipole is the rabbit ear television antenna. A basic dipole antenna looks like a T split in half. The most common omni-directional antenna is a dipole. Thus, omni-directional antennas are known to have a “doughnut-shaped” radiation pattern. When gain is applied to an omni antenna, the radiation pattern around the antenna expands outwards (horizontally), allowing the antenna to reach farther at the cost of emitting less radiation at the top and the bottom. What do we mean by horizontal directions?Īntennas have a certain amount of gain associated with them, which we’ll get into later. For Commercial What is an Omni-Directional Antenna?Īn omni-directional antenna is an antenna designed to send and receive equal amounts of signal in all horizontal directions.
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