Akụkọ

Oge: 2021-09-02

Oge nke ihe ahụ merenụ na ebili mmiri na-egosipụta n'otu ebe ahụ, njupụta voltaji nke oke voltaji amplitude nchikota Vmax, na-akpụ antinodes; ihe merenụ na ebili mmiri na-egosipụta na akụkụ nke ọzọ metụtara njupụta voltaji mpaghara na-ebelata ka opekempe voltaji njupụta Vmin, nguzobe nke ọnụ. Uru njupụta nke isi ihe ọ bụla dị n'etiti antinodes na ọnụ n'etiti. Nke a sịntetik ife a na-akpọ ahịrị guzo. SWR bụ njupụta ebili mmiri na-eguzo n'ụda n'ime afọ Vmax yana ọnụ na nha nke njupụta nke nrụgide ụda Vmin. Na tube ebili mmiri guzoro, VSWR a tụrụ atụ, enwere ike nweta ihe nnabata ụda nwere ike nweta ọnụọgụ ntụgharị na ọnụọgụ absorption.

Na nkwurịta okwu redio, impedance antenna adịghị adaba na onye na-enye nri ma ọ bụ ihe na-ebufe antenna impedance, ike dị elu ga-emepụta echiche agbakọtara, akụkụ dị n'ihu nke nnyonye anya ebili mmiri na-apụta. Iji mara ma tụọ njirimara VSWR nke usoro antenna, ya bụ, antenna nke ikuku na-aga n'ihu na nke na-egosipụta, ọ kwadoro echiche "SWR",

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

Ntụle ntụgharị uche K = (Rr) / (R + r)

(K bụ uru na-adịghị mma na-egosi na akụkụ nke ọzọ)

N'ime ebe R na r bụ ihe nrụpụta mmepụta yana impedance ntinye. Mgbe abụọ ụkpụrụ dị ka impedance, nke ahụ bụ n'ụzọ zuru okè dakọtara , echiche ọnụọgụgụ K bụ hà 0, VSWR bụ 1. Nke a bụ ezigbo ọnọdụ, n'ezie, a na-egosipụta mgbe niile, nke mere na ebili mmiri na-ebili mgbe niile karịa 1.

RF usoro impedance dakọtara. Pụrụ iche anya na voltaji na Bo Bida ụfọdụ chọrọ, n'ihi na mgbe ị na-eji brọdband ugboro nso bụ nnọọ obosara, guzo ife ruru ga-agbanwe ugboro ugboro, kwesịrị ime ka o kwe omume a dịgasị iche iche impedance kenha.

VSWR pụtara: VSWR bụ uru ọnụọgụgụ na-anọchite anya th

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