Communications Systems Chapter 9 Test.doc ~1.

Communications Systems Chapter 9 Test.doc ~1. -...

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Communications Systems Chapter 9 Test 1. Describe the difference between the antenna near field and far field: Near field --energy is carried back and forth from the antenna to the reactive Far field—transfers the info a distance from the source 2. Describe the relationship of the intensity of the antenna magnetic and electric fields: Intensity increases the charge acceleration and charge movement “I wasn’t really sure exactly what this question is asking” 3. The direction of the __ electric __ field determines the polarization of the antenna. 4. What is the wavelength in feet of an antenna transmitting at 156 MHz? 6.3049 ft 5. What is the 1/4 wavelength of an antenna transmitting at 100 KHz? 2460 feet 6. A doubling of power results in a _ 6 _ dB antenna gain. 7. A common directional TV antenna is known as a __ yagi-uda __, named after its inventor. 8. The extra elements for the antenna in question 7 are known as _ parasitic _ elements because they are not directly connected to the feed line. 9.
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Communications Systems Chapter 9 Test.doc ~1. -...

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