封闭空间中的电磁波.DOC

第四讲 在封闭空间中电磁波 ——金属（理想导体）谐振腔 S11回波损耗，即有多少能量被反射回源端（Port1），这个值越小越好，一般S11 0.1，即－20dB；也就是有多少能量被传输到目的端（Port2）了，这个值越大越好，理想值是1 Boundary Conditions at the interface between ideal conductor, silver coatings （media 1）and dielectric media（media 2）, air in the cavity. Conclusions: 证明：两平行无穷大理想导体平板之间可以传播一种偏振的横电磁模（TEM Mode） √ TEM Wave 1: Ez = 0, Ex = 0, Ey ≠ 0; Hz = 0, Hx ≠ 0, Hy = 0 × TEM Wave 2: Ez = 0, Ex ≠ 0, Ey = 0; Hz = 0 Rectangular Metallic Cavity Resonators （矩形金属谐振腔） 。 现在要求解： The resonant frequency The resonant frequency is the same for TM or TE modes (Cavity TM Mode to z, Cavity TE Mode to z), except that the lowest-order TM is TM110 and the lowest-order in TE is TE101. The field maps of the dominate mode and a few low-order modes in the cavity 9