Izici zama-Microwave
Ama-microwave ayingxenye ye-spectrum kagesi esetshenziswa kabanzi empilweni yanamuhla, kusukela ekuxhumaneni okungenantambo kuya kumishini yasekhaya. Nakuba evame ukuhlotshaniswa nama-microwave oven, ama-microwave empeleni anendima ebanzi kakhulu, ikakhulukazi kubuchwepheshe be-radar, amasathelayithi, amanethiwekhi eselula, kanye nezinhlelo zokuzulazula. Ukuze siqonde ukuthi kungani ama-microwave ebaluleke kangaka, sidinga ukuqonda izici zawo eziyinhloko: ububanzi bemvamisa kanye nobude bamaza, izindlela zokusabalalisa, ukusebenzisana nezinto, izakhiwo zokuzindla kanye nokungena, kanye nezici zokuphepha ekusetshenzisweni kwawo.
1. Indawo yama-microwave ku-spectrum ye-electromagnetic
Ama-microwave angamagagasi kagesi, okusho ukuthi angasakazeka ngaphandle kwe-medium (vacuum) futhi aqukethe amasimu kagesi namagnetic ajikelezayo aqonde komunye nomunye. Ngokuvamile, ama-microwave ahluka ngemvamisa kusukela cishe ku-300 MHz kuya ku-300 GHz, kanye nama-wavelength asukela cishe ku-1 meter kuya ku-1 millimeter. Lolu hlu luwabeka phakathi kwamagagasi omsakazo (ama-frequency aphansi) kanye ne-infrared (ama-frequency aphezulu).
Ngenxa yokuthi ubude bawo bamaza bufushane uma kuqhathaniswa namagagasi omsakazo aphansi, ama-microwave angathwala ulwazi oluningi futhi avumele ukusetshenziswa kwama-antenna amancane. Lesi esinye sezizathu esenza ama-microwave abe umgogodla wezinhlelo eziningi zokuxhumana zanamuhla.
2. Isivinini sokusabalala kanye nezakhiwo eziyisisekelo
Njengamanye amagagasi kagesi, ama-microwave ahamba ngesivinini sokukhanya ku-vacuum, esingaba ngu-3 × 10⁸ m/s. Esimweni esifana nomoya, ipulasitiki, noma izicubu eziphilayo, ijubane lihamba kancane kuye ngokuthi i-refractive index yesimo esiphakathi ingakanani.
Ama-microwave nawo anezakhiwo ezijwayelekile zamagagasi, njenge:
– Ukuzindla: kungabonakaliswa yizindawo zensimbi noma izinto ezihambisa umoya.
– Ukwehlukaniswa: indlela yokusabalala iyashintsha lapho ingena endaweni enezakhiwo zikagesi ezahlukene.
– Ukugoba (ukugoba): kungagoba kudlule umphetho wesithiyo, kodwa izinga lokugoba lincane kunezandi zomsakazo ezinobude obude be-wavelength.
– Ukuphazamiseka: ama-microwave amabili angaqinisana noma anciphe kuye ngesigaba.
Lezi zakhiwo zisetshenziswa kabanzi kuma-radar kanye nokuxhumana ngocingo, kodwa futhi zingabangela izinkinga ezifana ne-multipath (ukuzindla okuphindwe kabili) ezinhlelweni ze-Wi-Fi noma ekuxhumaneni kwamaselula.
3. Indlela yokusabalala ivame ukuba “umugqa wokubona”
Esinye isici esibalulekile sama-microwave ukuthambekela kwawo ekusakazekeni emgqeni oqondile (umugqa wokubona), ikakhulukazi kumaza aphezulu. Ngenxa yamaza awo amafushane, ama-microwave awagobeki kalula ngemiphetho yoMhlaba njengamaza omsakazo aphansi. Ngenxa yalokho, ukuxhumana kwama-microwave akude kuvame ukudinga:
– ama-antenna emibhoshongweni ephakeme,
– ophindayo noma odluliselayo,
– noma isathelayithi njengesixhumi.
Yingakho amanethiwekhi e-inter-tower microwave link evame ukusetshenziswa ukuxhuma izindawo ezimbili ezingabonana ngaphandle kokuvinjelwa yizakhiwo noma amagquma.
4. Ukusebenzisana nezinto: ukumuncwa kanye nokushisa kwe-dielectric
Isici esaziwa kakhulu sama-microwave yikhono lawo lokushisa izinto ezithile, ikakhulukazi lezo eziqukethe ama-molecule e-polar njengamanzi. Le nqubo yokushisa yenzeka ngokushisa kwe-dielectric: insimu kagesi ye-microwave ibangela ama-molecule e-polar (isb., i-H₂O) ukuthi ajikeleze futhi anyakaze, ngaleyo ndlela aguqule amandla amagagasi abe amandla okushisa.
Nokho, kubalulekile ukuqonda ukuthi akuzona zonke izinto ezifudumeza ngendlela efanayo. Izici zokushisa zincike ku:
– okuqukethwe kwamanzi,
- okungaguquki kwe-dielectric,
- isici sokulahlekelwa yi-dielectric,
– ukujiya kwezinto kanye nokusatshalaliswa kwensimu.
Insimbi ngokuvamile ivuselela ama-microwave, ngakho ayishisi kalula (ngaphandle kokuthi kudalwa inhlansi yinto ebukhali). Ingilazi kanye nezinye izinto zepulasitiki zivame ukungena kalula kuma-microwave, ngakho-ke izitsha zazo azishisi ngokushesha njengokudla—yize zisakwazi ukufudumala ngokuxhumana nokudla okushisayo.
5. Amakhono okungena alinganiselwe kodwa awusizo
Ama-microwave anekhono lokungena ezintweni ezithile ezingahambisi ugesi, kodwa ukujula kokungena kwawo kunqunyelwe futhi kuncike ekuvameni nasezimfanelweni zezinto. Kuma-oven e-microwave asekhaya, imvamisa evame ukusetshenziswa yi-2,45 GHz. Le mvamisa ikhethwe njengesivumelwano: isebenza kahle ngokwanele ekufudumaleni ukudla futhi inobubanzi bokungena obanele bezingcezu zokudla zansuku zonke.
Kwezinye izinhlelo zokusebenza, ama-microwave asetshenziswa ku:
- i-radar yesimo sezulu ukuthola amaconsi emvula kanye namaphethini esiphepho,
– izithombe ze-microwave zokuhlola izinto,
– ukuxhumana kwesathelayithi okusebenzisa amabhendi athile emvamisa (isib. i-C-band, i-Ku-band, i-Ka-band).
6. Ukuhlukaniswa kwe-polarization kanye nethonya layo ezinhlelweni zokuxhumana
Ama-microwave ane-polarization, okuyi-orientation yensimu kagesi njengoba isakazeka. I-polarization ingaba yi-linear (evundlile/eqondile), eyindilinga, noma eyindilinga. Ekuxhumaneni, ukufanisa i-polarization phakathi kwe-transmitter ne-receiver kubalulekile ngoba ukungafani kunganciphisa amandla esignali atholiwe.
I-Polarization isetshenziswa futhi ku:
- ukunciphisa ukuphazamiseka,
– ukwandisa umthamo wesiteshi (isb. nge-dual-polarization),
– ukuzivumelanisa nezimo ezithile zokusabalala, ikakhulukazi ekuxhumaneni ngesathelayithi.
7. Amathonya omoya: ukumanzisa kanye nemvula
Kuma-microwave, umkhathi ungaba nomthelela omkhulu, ikakhulukazi kumaza aphezulu. Ezinye izinto ezibalulekile yilezi:
– Ukufiphala kwemvula: amaconsi emvula amunca futhi asakaze amagagasi, ikakhulukazi kumaza e-Ku ne-Ka, ngakho ikhwalithi yezimpawu zesathelayithi noma izixhumanisi ze-microwave ingancipha ngesikhathi semvula enkulu.
– Ukumuncwa ngumhwamuko wamanzi nomoya-mpilo: ngezikhathi ezithile kukhona isiqongo sokumuncwa, ngakho-ke kukhona “ifasitela lemvamisa” elilungele kakhulu ukuxhumana okude.
– Ukusabalala: izinhlayiya emkhathini zingabangela ukusabalala okuthinta ukuzinza kwesignali.
Ngakho-ke, abaklami bezinhlelo ze-microwave kumele bacabangele i-power margin, ukukhethwa kwebhendi yemvamisa, kanye namasu okuguqula nokulungisa amaphutha.
8. Ukubonakaliswa okunamandla ngensimbi kanye nomgomo wokusebenza we-radar
Ama-microwave abonakaliswa kakhulu yizinto eziqhuba ugesi njengensimbi. Lesi sici siyisisekelo sobuchwepheshe be-radar (Ukuthola Umsakazo Nokulinganisa). I-Radar ikhipha ama-microwave bese ithola ama-wave aboniswayo ukuze ibale ibanga, isivinini, kanye nesiqondiso sento. Ngenxa yokuthi ama-microwave ane-wavelength emfushane kakhulu, i-radar ingathola imininingwane ecacile kunezinhlelo ezine-wavelength ende.
I-radar isetshenziswa ku:
- ukuhamba ngezindiza kanye nemikhumbi,
– i-radar yezimoto (isb. yokulawula ukuhamba ngesikebhe okuguquguqukayo),
- ukuqapha isimo sezulu,
– ukumepha ubuso bomhlaba (ukuzwa kude).
9. Imikhawulo yokuphepha kanye nokuchayeka
Ama-microwave ayimisebe engakhiqizi i-ionizing, okusho ukuthi amandla awo awanele ukuphula izibopho zamakhemikhali njenge-X-ray. Ingozi eyinhloko yokuchayeka kuma-microwave ihlobene nokushisa kwezicubu ngamandla aphezulu. Ngakho-ke, amazinga okuphepha amisa imikhawulo yokuchayeka emphakathini nakubasebenzi, futhi amadivayisi aklanyelwe ukugcina ukukhishwa komoya ngaphakathi kwemingcele ephephile.
Ezintweni zikagesi ezifana nama-oven e-microwave, izihlangu zensimbi nama-grille emnyango zenzelwe ukugcina ama-microwave ngaphakathi kwegumbi lokushisa. Amadivayisi okuxhumana afana ne-Wi-Fi kanye namafoni akhipha amandla aphansi kakhulu kunama-oven e-microwave, ngakho-ke ukuchayeka ngokuvamile kungaphakathi kwemingcele yomthetho.
10. Isiphetho
Izici ze-microwave zifaka phakathi ububanzi bemvamisa ephezulu enama-wavelength amafushane, ukuthambekela kokusabalala komugqa wokubona, ukubonakaliswa okunamandla yizinsimbi, kanye nokusebenzisana okuphawulekayo nezinto ze-dielectric ezingakhiqiza ukushisa. Ama-microwave nawo athintwa yizimo zomkhathi, ikakhulukazi imvula kanye nokumuncwa kwegesi, futhi afaka umqondo we-polarization, obalulekile ekuxhumaneni. Ukuqonda lezi zici kusenza sibone ukuthi kungani ama-microwave ebaluleke kangaka empilweni yanamuhla: avumela ukuxhumana okusheshayo, izinhlelo ze-radar ezinembile, kanye nobuchwepheshe bokushisa obusebenzayo—inqobo nje uma esetshenziswa ngezindinganiso ezifanele zokuklama nokuphepha.
