mid2-XXX

mid2-XXX - Midterm Exam 2 of EE161 Spring, 2006 Name: _...

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Midterm Exam 2 of EE161 Spring, 2006 Name: _________________ Score : _______________ Problem #1. (25 pts) In a coaxial transmission line (TEM mode only), the inner and outer conductors are with radius 0.5mm and 2 mm. The operating frequency is 3 GHz. (1) Find the characteristic impedance Z 0, when the coax is filled with air . (2)) Find the wave number k and the guiding wavelength g λ . (3) Redo (1) and (2) for the case when the coax is filled with Teflon ( ε r =2.55). (4) If a 3cm long section in this coax is filled with Teflon, what is the reflection coefficient when observed on the first air/dielectric surface, considering an infinite long section on the other end? 3cm Infinity Reflection Coef.
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Problem #2. (25 pts) A rectangular waveguide has a length a = 5cm and width b = 2cm. (1) Find the cutoff frequencies for the lowest four modes including both TM and TE modes and sort them in order (2) What is the phase constant β , guiding wavelength g λ , the phase velocity p v and group velocity
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mid2-XXX - Midterm Exam 2 of EE161 Spring, 2006 Name: _...

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