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In the radiation pattern, the power ratio of the mainlobe’s front and back is called Front to Back Ratio (F/B Ratio). The higher the F/B Ratio value, the more energy is not wasted in the unwanted direction. Read More
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In the radiation pattern, in most cases there are more than one lobes, which is called the mainlobe with the highest radiated energy and the rest is called sidelobes. Beamwidth means degree of the gain decrease by 3dB from the maximum gain, or, when the power intensity decreases to its half. Read More
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Under the same input power, gain is the ratio between the highest antenna's radiated power intensity and the standard unit antenna. Antenna gain represents the convergence of the radiation energy at the pointing direction. If Gain G=13dB=20 , to radiate 100W with the antenna, it only needs 100W / 20 ... Read More
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Antenna Radiation Direction--Antenna Radiation Enhancement Several symmetrical dipole antennas can form an antenna array to control the radiation direction. The "flat donut" radiation pattern suggests the energy is further converged on the horizontal direction. A reflection panel also works for ... Read More
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Antenna Radiation Direction--Antenna Direction Antenna has two basic functions: 1. radiates the energy into space from the transmission line. 2.radiates most of the energy to the desired direction. A vertical placed half-wave dipole antenna has a "donut" shape 3-D radiation pattern (Figure 3.1a). ... Read More
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Dipole antenna is one of the most fundamental antenna that still be widely used today. A single half-wave dipole can work independently, or work as a parabolic antenna's feeder. Several half-wave dipoles can combine to become antenna array. A dipole antenna with two arms of same length is named ... Read More
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Unless you hire someone to do the installation job for you, you will find that mounting a digital antenna is actually fairly easy. All antennas, assuming you purchased them brand new and from a reputable source, should come with a set of instructions and hopefully a diagram that you can refer to for ... Read More
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An antenna is a device that acts as a transformer to provide a good match between the feeding line as a local source of power and free space. If the antenna is not matched to free space, power will be reflected back toward the transmitter, resulting in a loss in radiated power. The antenna is one of ... Read More
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Like people and gourds, antennas come in all shapes and sizes. But unlike people, not all antennas are created equal. (The jury is still out on gourds.) The major cellular providers in the U.S. may use two separate frequency ranges for PCS data service--the 800 MHz band and the 1900 MHz band. Some ... Read More
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Before purchasing that new antenna, there are some factors, both major and minor, that you need to consider. Whether you are purchasing a new antenna to replace your current one or you will be purchasing an antenna for the first time, the most important factor to consider in your purchase is the ... Read More
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