H.=0 (710a) h=0 (710b) knsine j 1 (7.10c) 4Ikr (kr 场点P的电场强度为 r-sin e rsin e V×H Joo H e rsin oh 将式(7.10)代入上式,得场点P的电场强度为 2 0 sin sin 1 sin r r r r r = J r H rH r H               =    a a a E H 将式（7.10）代入上式，得 0 (7.10a) (7.10b) H r H = =  2 j 2 sin 1 (7.10c) 4 ( ) k Il j kr H e kr kr    −   = +    