上海祥樹(shù) VEMIE2-W21R 80
上海祥樹(shù) VEMIE2-W21R 80
個(gè)相距d=(2n+1)λg0/4 的小孔實(shí)現(xiàn)耦合其中,λg0是中心頻率所對(duì)應(yīng)的波導(dǎo)波長(zhǎng),n為正整數(shù),一般取n=0。耦合孔一般是圓形,也可以是其它形狀。當(dāng)工作在中心頻率時(shí),βd=π/2,此時(shí)D→∞; 當(dāng)偏離中心頻率時(shí),secβd具有一定的數(shù)值,此時(shí)D不再為無(wú)窮大。實(shí)際上雙孔耦合器即使在中心頻率上,其定向性也不是無(wú)窮大,而只能在30dB左右。
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