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The dispersive fade margin (DFM), a value expressed in decibels, is the measure of a receiver s ability to resist dispersive fading Digital microwave radio manufacturers measure and provide the dispersive fade margin from the typical (measured) fading signatures for their digital radio receivers To measure the DFM of a digital radio receiver, manufacturers simulate multipath fading conditions either in the field or at the factory W D Rummler of Bell Laboratories has developed a simplified threepath model of multipath propagation and has shown that 63 ns is approximately the delay time measured on real microwave links in the US The dispersive fading lab simulation will work at either the carrier (RF) frequency or the intermediate frequency (IF) Most manufacturers of multipath simulation systems incorporate IF in their designs because of relative ease of design and better accuracy at lower frequencies



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The dispersive fade margin is defined as the average depth of multipath fade that causes an outage, independent of thermal and interference fade margins, and can be approximated using the following formula: 2( f ) e B / 38 DFM 176 10 log 1584 where f = signature width of the equipment B = notch depth of the equipment It is important to remember the following facts about selective fading:





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1 In a UHF RFID system, interrogators and tags are using 900 MHz frequency What is the approximate wavelength of the radio waves emitted by the interrogator antenna A B C D A B C D 33 feet 33 meters 33 centimeters 65 inches The distance between two consecutive positive peaks on the wave The distance traveled by the wave during 1 microsecond The distance traveled by the wave during 1 millisecond The distance between the positive peak and the negative peak

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If f and B are not available, the user can de ne DFM explicitly as well In Europe, signature width is usually given for the microwave radio; in North America, it is commonly provided in the form of dispersive fade margin (the usual values are 45 65 dB) Increasing the output power so as to reduce the outage time for selective fading does not give any improvement It only increases the at fading or reduces the thermal noise power received without having any in uence on the effects (amplitude and group delay distortions across the channel) of selective fading

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3 What is the relationship between the power density (PD) of an electromagnetic wave and the distance (d) from the source of the radiated wave A Path density (PD) is proportional to square of distance (d ) PD d2 B Path density (PD) is proportional to distance (d) PD d C Path density (PD) is inversely proportional to (d) PD 1/d 2 2 D Path density (PD) is inversely proportional to (d ) PD 1/d 4 Radio waves are highly reflected from what A B C D Dielectric material Conductive material All material Water

In addition, it is very important to notice that modern digital microwave radios are very robust and practically immune to dispersive (spectrum-distorting) fade activity Only a major error in path engineering (wrong antenna size or misalignment) over the high-clearance path can cause dispersive fading problems

The principal gaseous absorption is by oxygen and water vapor Oxygen loss is negligible for frequencies up to about 50 GHz The first and best known effect of rain is that it attenuates the signal The attenuation is caused by the scattering and absorption of electromagnetic waves by drops of liquid water The scattering diffuses the signal, while absorption involves the resonance of the waves with individual molecules of water Water vapor absorption is highly dependent on the frequency as well as the density of the water vapor (absolute humidity, gm/m3) Water vapor absorption can be significant for long paths (>10 km) Loss has a local maximum at 23 GHz and a local minimum at about 31 GHz Absorption increases the molecular energy, corresponding to a slight increase in temperature, and this results in an equivalent loss of signal energy

5 If a cable has 13 dB loss, what percentage of the original signal power will be received at the other end of the cable A B C D A B C D 10 5 15 85 Inductive coupling operates in near-field and uses a magnetic field Inductive coupling operates in far-field and uses a magnetic field Inductive coupling operates in near-field and uses radio waves Inductive coupling operates in far-field and uses radio waves

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