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17 Figure 5. The vertical dipole and itselectromagnetic equivalent, the verticalmonopole5. antenna TYPESA ntennas can be classified in several way is the frequency band of include physical structure andelectrical/electromagnetic design. Theantennas commonly used for LMR both atbase stations and mobile units representonly a very small portion of all the simple, nondirectional antennas arebasic dipoles or monopoles. More complex,directional antennas consist of arrays ofelements, such as dipoles, or use one activeand several passive elements, as in the antenna technologies are beingdeveloped that allow an antenna to rapidlychange its pattern in response to changes indirection of arrival of the received antennas and the supportingtechnology are called adaptive or smart antennas and may be used for the higher-frequency LMR bands in the and MonopolesThe vertical dipole or its electromagneticequivalent, the monopole could beconsidered one of the best antennas for LMRapplications.

This antenna has moderately high gain, but its most important pattern feature is that the forward (main beam) gain is much higher than the gain in the opposite direction. This is called the front-to-back ratio and is evident in the pattern shown in figure 14. 5.4 Yagi Another antenna design that uses passive elements is the Yagi antenna. This ...

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