Below are the answers key for Frenzel Self-test in Chapter 10: Microwave Techniques from the book COMMUNICATIONS ELECTRONICS by Louis E. Frenzel. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.
1. 1
2. bandwidth or spectrum
3. more difficult to analyze; different measurement techniques; resistors, capacitors, and inductors act
like LCR circuits; conventional semiconductors do not work owing to internal capacitances and long
transit time; special, expensive vacuum tubes are used for power amplification; line-of-sight
transmission differences; excessive signal reflection and absorption
4. telephone, radar
5. television signal relay, space communications, radio telescopes, microwave heating
6. Federal Communications Commission
7. improved receiver selectivity, SSB, multiplexing, reduced FM deviation
8. internal capacitance, long transit time
9. LCR
10. 36, 3.6
11. true
12. attenuation
13. 6
14. waveguide
15. microstrip, stripline
16. probe, loop
17. high-pass
18. 4.921
19. (a) true, (b) false
20. H, E
21.TEO,1
22. transverse magnetic
23. cavity resonator
24. parallel resonant
25. tuned circuits, filters
26. resonant frequency
27. high capacitance, high inductance, long transit time
28. P-type silicon, tungsten whisker
29. Schottky barrier, or hot carrier
30. mixer
31. varactor
32. varactor, snap-off or step-recovery diode
33. Gunn
34. IMPATT, TRAPATT, tunnel
35. negative resistance
36. reverse
37. forward
38. true
39. false
40. amplifier
41. cavity resonators
42. velocity
43. buncher, catcher
44. reflex
45. Gunn diodes, TWTs
46. permanent magnet
47. radar, microwave ovens
48. amplifier
49. helix
50. bandwidth
51. horn
52. increase, decrease
53. 11.8
54. 10, 60
55. 37.5, 13.3
56. wide
57. parabola
58. focal point
59. horn
60. 55.39, 0.242
61. increase, decrease
62. Cassegrain
63. simplicity, low cost
64. 12, 20
65. 12, 45
66. circularly
67. right-hand circular polarization
68. bicone
69. true
70. false
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