N'ihu ihe ngosi oru ngo nke imewe RF, otu n'ime okwu ndị a na-ahụkarị bụ "dB". Maka onye injinia RF, dB na-amakarị aha ya mgbe ụfọdụ. dB bụ nkeji logarithmic nke na-enye ụzọ dabara adaba iji gosipụta oke, dịka oke n'etiti mgbama ntinye na mgbama mmepụta.
Ebe dB bụ oke, ọ bụ ngalaba ikwu, ọ bụghị nke zuru oke. A na-atụle voltaji nke mgbaàmà ahụ kpamkpam, n'ihi na anyị na-ekwu mgbe niile nwere ike ịdị iche, ya bụ, ọdịiche nwere ike dị n'etiti isi ihe abụọ; Ọtụtụ mgbe, anyị na-ezo aka na ikike nke ọnụ ọnụ n'akụkụ ọnụ ala 0 V. A na-atụlekwa ihe mgbaàmà dị ugbu a nke ọma, ebe ọ bụ na unit (ampere) na-agụnye ụgwọ a kapịrị ọnụ maka otu oge. N'ụzọ dị iche, dB bụ otu nke gụnyere logarithm nke oke n'etiti ọnụọgụ abụọ. Dịka ọmụmaatụ, uru amplifier: Ọ bụrụ na ike nke mgbama ntinye bụ 1 W na ike nke mgbama mmepụta bụ 5 W, nha bụ 5, nke na-atụgharị na dB bụ 6.9897dB.
Ya mere, amplifier na-enye uru ike nke 7dB, ya bụ, oke dị n'etiti ike mgbama mmepụta na ike ntinye aka nwere ike ịkọwa dị ka 7dB.
Gịnị kpatara eji dB?
Ọ ga-ekwe omume ịmepụta na ịnwale usoro RF na-ejighị dB, mana n'eziokwu, dB dị ebe niile. Otu uru bụ na ọnụ ọgụgụ dB na-enye anyị ohere igosipụta oke oke na-ejighi ọnụ ọgụgụ buru ibu: 1,000,000 nwere uru ike nke naanị 60dB. Na mgbakwunye, ngụkọta uru ma ọ bụ mfu nke yinye mgbaama dị na ngalaba dB ma dị mfe ịgbakọ n'ihi na a na-agbakwunye nọmba dB n'otu n'otu (ma ọ bụrụ na anyị na-eji oke nkịtị, achọrọ ịba ụba).
Uru ọzọ bụ ihe anyị maara site na ahụmahụ nke nzacha. Sistemụ RF na-agbagharị gburugburu ugboro yana ụzọ dị iche iche esi ewepụta, chịkwaa ma ọ bụ metuta frequency site na ihe mejupụtara ya na sekit sekit parasitic. Ọnụ ọgụgụ dB dabara adaba n'ọnọdụ dị otú ahụ n'ihi na atụmatụ nzaghachi ugboro ugboro na-enwe nghọta ma na-ahụ anya mgbe axis ugboro na-eji ọnụọgụ logarithmic na amplitude axis na-eji nha dB.
Ya mere, na usoro nke ịmepụta nzacha, ọ dị mkpa ka ị kpachapụ anya.
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Oge nzipu: Mar-04-2022
