Nūhou

Manawa: 2021-09-02

ʻO ka pae o ka hanana a me nā nalu i ʻike ʻia ma kahi hoʻokahi, ka amplitude voltage o ka nui o ka volta amplitude sum Vmax, e hana ana i nā antinodes; ʻO ka hanana a me nā nalu i ʻike ʻia ma kahi ʻē aʻe e pili ana i ka amplitude voltage kūloko i hoʻemi ʻia i ka amplitude voltage haʻahaʻa Vmin, ka hoʻokumu ʻana o ka node. Aia kekahi waiwai amplitude o kēlā me kēia kiko ma waena o nā antinodes a me ka node ma waena. Kapa ʻia kēia nalu synthetic he lālani kū. ʻO SWR ka amplitude hawewe kū o ke kaomi kani ma ka ʻōpū Vmax a me ka node ma ka ratio o ka amplitude o ke kaomi kani Vmin. I loko o ka paipu nalu kū, ka VSWR i ana, hiki ke loaʻa ka mea hoʻoheheʻe kani i ka coefficient noʻonoʻo a me ka coefficient absorption.

Ma ka lekiō, ka antenna impedance mismatch me ka mea hānai a i ʻole ka transmitter antenna impedance mismatch, ʻo ka ikehu kiʻekiʻe e hana i nā noʻonoʻo i hoʻopili ʻia, a ʻo ka ʻaoʻao o mua o ka hawewe kū kū i ka hui. I mea e ʻike ai a ana i nā hiʻohiʻona VSWR o ka ʻōnaehana antenna, ʻo ia hoʻi, ʻo ka antenna o ka nalu i mua a me ka nalu i hōʻike ʻia, ua hoʻokumu ʻo ia i ka manaʻo "SWR",

SWR = R / r = (1 + K) / (1-K)

Koefisien noʻonoʻo K = (Rr) / (R + r)

(K he waiwai maikaʻi ʻole e hōʻike ana i ka pae ʻē aʻe )

Ma kahi o R a me r ka impedance pukana a me ka impedance komo. Ke hoʻohālikelike ʻia nā koina ʻelua e like me ka impedance, ʻo ka coefficient noʻonoʻo K ua like me 0, VSWR ʻo 1. He kūlana kūpono kēia, ʻoiaʻiʻo, ʻike mau ʻia, no laila ʻoi aku ka nui o ka hawewe kū ma mua o 1.

RF ʻōnaehana impedance pili. Manaʻo kūikawā i ka volta ma Bo Bida i kekahi mau koi, no ka mea, ke hoʻohana ʻoe i ka laulā ākea ākea ākea, e loli ka lākiō hawewe kū me ka alapine, pono e hiki ke hoʻohālikelike i ka impedance ākea.

VSWR manaʻo: ʻO VSWR kahi waiwai helu e hōʻike ana i ka th

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