Ku'ina Koho o ka nui alaka'i nalu

3. Attenuation o ka nalu
Ma hope o ka hele ʻana o ka microwave i ke alakaʻi nalu, ua manaʻo ʻia ʻaʻole e nalowale ka mana. ʻO ka hoʻonui ʻana i ka b hiki ke liʻiliʻi i ka attenuation, no laila ʻoi aku ka nui o ka b e like me ka hiki.
Ke noʻonoʻo nei i nā mea hoihoi, koho ʻia ka nui o ke alakaʻi nalu rectangular e like me:

a=0.7λ, λ ka lōʻihi hawewe ʻoki ʻia o TE10
b=(0.4-0.5)a

Hoʻolālā ʻia ka hapa nui o nā alakaʻi nalu rectangular me kahi lākiō hiʻohiʻona o a:b=2:1, i ʻike ʻia ʻo nā alakaʻi nalu maʻamau, i hiki ke hoʻokō i ka ratio bandwidth kiʻekiʻe o 2:1, ʻo ia hoʻi, ka ratio o ke alapine kiʻekiʻe i ka ʻoki haʻahaʻa. ʻO ka pinepine he 2:1. I mea e hoʻomaikaʻi ai i ka mana mana, ua kapa ʻia ke alakaʻi nalu me ka b>a/2 he alakaʻi nalu kiʻekiʻe; i mea e hoemi ai i ka leo a me ke kaumaha, ke alakai nalu me ka b

ʻO ka lākiō bandwidth kiʻekiʻe loa e hiki ai i ke alakaʻi nalu pōʻai ke hoʻolaha ʻo 1.3601:1, ʻo ia hoʻi, ʻo ka ratio o ka alapine kiʻekiʻe loa i ka alapine ʻoki haʻahaʻa he 1.3601:1. ʻO ka alapine hana i manaʻo ʻia no kahi alakaʻi hawewe rectangular he alapine 30% ma luna o ke alapine cutoff a me 5% ma lalo o ka lua o ke alapine cutoff mode kiʻekiʻe. ʻO kēia mau kumu waiwai i ʻōlelo ʻia e pale i ka hoʻopuehu pinepine ʻana i nā alapine haʻahaʻa a me ka hana multimode ma nā alapine kiʻekiʻe.