上海祥樹 VEMIE2-W21R 80

上海祥樹 VEMIE2-W21R 80
個(gè)相距d=(2n+1)λg0/4 的小孔實(shí)現(xiàn)耦合其中，λg0是中心頻率所對應(yīng)的波導(dǎo)波長，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，其定向性也不是無窮大，而只能在30dB左右。

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