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designed for a particular frequency for example, HF, UHF, or microwave No antenna tuning is required during installation of the antenna The bandwidth of an antenna is the range of frequencies over which the antenna is effective The bandwidth is typically centered on the resonant frequency of the antenna The UHF RFID systems work at 902 to 928 MHz in the United States The central frequency of this range is 915 MHz All the antennas for this system are designed for 915 MHz resonant frequency and they must work well over a band of 13 MHz from 915 MHz Typically, usable bandwidth is between the frequencies at which the voltage standing wave ratio (VSWR), a term to be defined in the next section, is less than 20 This is shown in Figure 2-12



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Figure 212 Cell on wheels (COW)





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self-sufficient and capable of operating in the field for extended periods of time, and one person can usually set one up in less than an hour Natural and man-made disasters can be catastrophic to communications networks Microwave systems are often used to restore communications when other transmission equipment has been damaged by earthquakes, floods, hurricanes, or other natural disasters; conflicts such as terrorist attack and wars; and other wireless network problems COW is usually connected via a leased T1/E1 backhaul circuit with the switch or via microwave link to the nearest working cell site In case of microwave connection, licensed or license-exempt microwave radios can be used, but the preference would be to use a license-exempt spread-spectrum microwave link The military uses what it calls a tactical transportable antenna system (TTAS) for applications in which rapid deployment is a critical concern The system consists of a 3-m-diameter reflector mounted on a modified military trailer The system provides ground-level elevation and azimuth controls and is supplied with guy wires, ground anchors, and waveguide termination behind the reflector A trained team of two people can erect the antenna in less than 20 minutes The system is usually used for line-of-sight or over-the-horizon microwave communications in the 5 GHz band 25 Other Microwave Systems

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Know that an antenna transmits a radio signal most efficiently when the antenna resonant frequency matches the signal carrier frequency

So far, we have talked about point-to-point microwave systems (often simply called microwave systems) that provide wideband communications over the line-of-sight paths Microwave technology is becoming increasingly useful for accessing individual users and narrow- and medium-bandwidth groups of users, thereby replacing wireline or fitting into the bandwidth gap between wireline and fiber Expectations are to see more microwave applications for WLL, WLANs, Bluetooth, and other new short-range access technologies Many of these are nontraditional microwave applications, however, and they are not as easily recognized as the traditional microwave fixed services of the past The new applications will tend to move the microwave industry closer to the individual user and closer to the mass market These short-range access markets will be particularly suitable for higher microwave frequency bands where the smaller antenna size, greater frequency reuse, and wider available bandwidths provide major advantages It is important to note that 3G and 4G technologies (WCDMA, CDMA2000, WiMAX) and WLAN, as well as Bluetooth, are all technologies operating in the 2-GHz microwave band

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In addition to terrestrial systems operating within the radio horizon (LOS), there is a different type of point-to-point microwave system These are called over-the-horizon (OH) systems (see Figure 213) and are described in ITU-R P617 For OH (also called transhorizon) paths, the propagation of the signal over the horizon is possible because of diffraction of the wave over the horizon, scattering of the signal from the troposphere, or both Diffraction is achieved over Earth s curvature and over terrain features such as hills Tropospheric scatter, although very weak, can be the strongest mode of operation at very long distances For links within the radio horizon, the antennas should be placed to provide direct line-of-sight transmission Practically, this means that the equipment should be installed on towers or buildings of a certain height that fulfill the line-of-sight requirement and minimize the probability of the fading due to multipath propagation On the other hand, for over-the-horizon links, a virtual tower height is defined either by the propagation mechanism itself (scattering capability of the troposphere, reflection capability of the meteorite tail) or by the physical placement of the equipment (stratosphere platform, satellite platform) The troposphere is the lowest 10-km part of the atmosphere, and the inhomogenities within the common beam volume of the transmit and receive antennas act as sources that scatter the electromagnetic waves into all directions of space Thus, components will be generated establishing coupling between transmitter and receiver The first troposcatter link was put into operation in 1953, and the link allows distances of up to 400 to 500 km to be spanned

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