Untuk memahami lebih lanjut materi Saluran Transmisi Gelombang Mikro, kerjakan soal berikut ini dengan menuliskan di catatan anda dengan rapi kemudian foto scan pada lembar tersebut yang telah dibubuhi Nama NIM dan Kelas. Simpan foto tersebut dalam format PDF tidak lebih dari 5MB dan submit pada link form di bawah ini. Pastikan nama anda ada dalam form pengisian tersebut, bila tidak silahkan hubungi pak Untung.
Aturan mengerjakan tugas 6 ini dengan menuliskan <nomor> <soal dalam bahasa Indonesia> kemudian <jawaban anda dalam bahasa Indonesia> begitu seterusnya sehingga anda punya catatan untuk belajar.
1. Name four categories of transmission lines.
2. What restricts the use of two-wire line in the microwave region?
3. How do TEM and TE waves differ?
4. How do TE and TM waves differ?
5. Define principal mode of propagation.
6. What is the principal mode of transmission through a two-wire line?
7. Characteristic impedance of a two-wire line depends on what parameters?
8. What is the principal mode of propagation through coaxial line?
9. Under what conditions will higher-order modes occur in coaxial line?
10. Explain how the characteristic impedance of coaxial line is affected by the dielectric material between the conductors.
11. What determines the higher-order TE modes in coaxial line?
12. What determines the higher-order TM modes in coaxial line?
13. What limits the use of coaxial lines?
14. Explain how an electromagnetic wave can travel between two parallel conducting surfaces. Why must the surfaces be conducting surfaces?
15. Explain why both incident and reflected waves are required to propagate an electromagnetic wave through a rectangular waveguide!
16. What happens to an incident wave at the cutoff frequency in a waveguide?
17. Can the phase velocity exceed the speed of light in a waveguide? Explain.
18. Is the group velocity greater or less than the velocity of the incoming wave? Explain.
19. If the frequency of operation of the incident wave to a waveguide is much greater than the cutoff frequency, what value does the group velocity approach?
20. What are the limits of values of the group wavelength within a waveguide?
21. How do the dimensions of a waveguide affect the cutoff frequency?
22. For higher modes of propagation within a waveguide, what relationship with respect to wavelength must the inner dimensions of the waveguide follow?
23. How are higher TE and TM modes designated for waveguides?
24. What do the circular mode subscripts m and n represent?
25. Why are circular rather than rectangular waveguides used for rotary joints?
26. What type of mode should be used with circular waveguide if a rotary joint is involved? Why?
27. With circular waveguides, why is it desirable to excite them with symmetrical modes?
28. What is meant by a ridged waveguide?
29. What are three advantages of a ridged waveguide?
30. Why is the use of ridged waveguide restricted to relatively short lengths of guide?
31. Why are the ridges tapered in ridged waveguide?
32. What occurs in the region of discontinuity of a waveguide?
33. How is stripline fabricated?
34. How is stripline used in microwave applications?
35. What is the principal mode of propagation within stripline?
36. How does stripline differ from microstrip?
37. If a two-wire line has an inductance of 180 nH/m and a capacitance of 80 pF/m, what is its characteristic impedance?
38. What is the characteristic impedance for two-wire line if the diameter of the wires is 0.129 cm and the spacing of the wires is 0.098 cm?
39. Find the spacing between a 75 Ī©, two-wire line if the diameter of each wire is 0.259 cm.
40. If the frequency of operation of a coaxial line is increased by a factor of 10, by what factor is the skin depth decreased?
41. What is the wavelength in centimeters of a TEM wave within an air dielectric coaxial line if the frequency of operation is 13.8 GHz? If the dielectric constant is equal to 2.38?
42. What is the cutoff frequency and wavelength for the principal TE mode of a coaxial line if the diameter of the wire is 0.0813cm, the inner diameter of the outer conductor is 0.295 cm, and the dielectric constant e' = 2.38?
43. If it is desired to make 50 Ī©, rigid, air-filled coaxial line from 1/2-inch diameter copper tubing, what should the diameter of the inner wire be?
44. What ratio of D/d would be required for an air dielectric coaxial line with a characteristic impedance of 75 Ī©? For e' = 2.38?
45. What is the characteristic impedance of an air dielectric coaxial transmission line if the ratio of the inner and outer conductors is 3.5/1?
46. Repeat Prob. 45 for a dielectric constant of e' = 3.5.
47. The attenuation of 62A coaxial line is 18.4 dB/100 ft at a frequency of 3 GHz. Find the loss of power through a line 1 m long with an input power of 4.5 W.
48. Find the cutoff wavelength and frequency for a waveguide with outer dimensions of 2.0 x 1.0 inch and a wall thickness of 0.064 inch.
49. Find the group velocity for the waveguide of Prob. 48 for a frequency of operation of 3.5 GHz.
50. Find the phase velocity for the waveguide of Prob. 49.
51. What is the ratio of the incident wavelength to cutoff wavelength if the group velocity vg = 2.5 x 10l0 cm/s?
52. What is the phase velocity for Prob. 51?
53. Find the group velocity if the cutoff frequency is 23 GHz and the frequency of operation is equal to 34 GHz.
54. Find the cutoff frequency and cutoff wavelength for a waveguide in the TE2,1 mode if the dimensions of the guide are 3.0 by 1.5 cm with a wall thickness of 0.08 cm.
55. Find the characteristic wave impedance for a waveguide operating in the TE2,1 mode for a frequency of 23.7 GHz if the dimensions of the waveguide are 2.54 cm by 1.27 cm.
56. What is the cutoff frequency for a circular waveguide operating in the TE1,1 mode if the radius of the guide is 4.0 cm?
57. What is the cutoff frequency for a circular waveguide operating in the TM0,1 mode if the radius of the guide is 4.0 cm?
58. What is the cutoff frequency for a circular waveguide operating in the TM2,1 mode if the radius of the guide is 4.0 cm?
59. What is the wavelength of a 16-GHz wave within a stripline with a dielectric constant e' = 2.55?
60. Find the cutoff frequency and wavelength of an RG/U waveguide with a TE1,0 wave if the outside dimensions of the guide are 1.78 x 0.993 cm and the wall thickness is 0.102 cm. How would the cutoff frequency differ for a TE2,1 mode?
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