课程名称︰天线 课程性质︰选修 课程教师︰许博文 开课学院：电资学院 开课系所︰电信所 考试日期（年月日）︰2006/11/16 考试时限（分钟）：3 hrs 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 1. Verify Eq.(1.61) in Chapter 1 of Elliott's book.(10%) 2. Prove that a RHCP(right-hand circularly-polarized) wave normally incident on a plane perfect conductor changes to LHCP upon reflection.(15%) 3. Most fender-mount car antennas are 31 inches long. We assume that the fender images the monopole antenna, forming a dipole 62 inches long (L =1.575m). For an operating frequency of 1 MHz ,find the radiation resistance of the antenna.(15%) 4. A citizen's band radio at 27 MHz uses a half-wavelength long dipole. Find its peak directivity assuming that the current is triangular [I = Io(1-|ξ|/ι),where 2ι is the total length].(15%) 5. A plane wave is normally incident on a slit in an infinite perfectly conducting plane . If the slit is infinite in the x-direction and is L i ^ -jβz wide in the y-direction and assume that the incident field E = yEo*e associated with the plane wave propagating in the z-direction renders the field over the physical aperture ,so ^ Ea = yEo,for|y|≦L/2 at z=0; and 0 elsewhere. find the radiation pattern of this slit.(15%) 6. Prove that why ▽。E=0? in Eq.(3.61) in Chater 3 of Elliott's book.(10%) 7. Solve prob. 3.7 in Chapter 3 of Elliott's book.(10%) --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 61.217.214.106