Iindaba - I-Antenna Basics : IiParameters ze-Antenna ezisisiseko

Izinto ezinobushushu bokwenyani ngaphezu kweqanda ngokupheleleyo ziya kukhupha amandla. Ubungakanani bamandla asasazwayo budla ngokubonakaliswa kubushushu obulinganayo be-TB, obudla ngokubizwa ngokuba liqondo lobushushu obuqaqambileyo, obuchazwa ngolu hlobo:

I-TB bubushushu bokuqaqamba (ubushushu obulinganayo), ε bubushushu, i-Tm lolona qondo lobushushu bemolekyuli, kunye no-Γ ngumlinganiso womphezulu ophumayo onxulumene nokwahlulwahlulwa kwamaza.

Ekubeni i-emissivity ikwisithuba sekhefu [0,1], ixabiso eliphezulu elinokufikelela kubushushu bokukhanya lilingana nobushushu bemolekyuli. Ngokubanzi, ukukhupha ngumsebenzi we-frequency yokusebenza, i-polarization yamandla akhutshiweyo, kunye nesakhiwo seemolekyuli zento. Kwii-microwave frequencies, ii-emitters zendalo zamandla alungileyo zisemhlabeni kunye nobushushu obulinganayo obumalunga ne-300K, okanye isibhakabhaka kwicala le-zenith kunye nobushushu obulinganayo obumalunga ne-5K, okanye isibhakabhaka kwicala elithe tye le-100 ~ 150K.

Ubushushu bokukhanya obukhutshwa yimithombo eyahlukeneyo yokukhanya bubanjwa yi-eriyali kwaye bubonakala kwii-eriyaliukuphela kwimo yobushushu be-eriyali. Ubushushu obuvela kwisiphelo se-eriyali bunikwa ngokusekwe kule fomula ingentla emva kokulinganisa ipateni ye-eriyali. Inokubonakaliswa ngolu hlobo:

TA bubushushu be-eriyali. Ukuba akukho lahleko ingafaniyo kwaye umgca wothumelo phakathi kwe-eriyali kunye nomamkeli akanalahleko, amandla engxolo agqithiselwe kumamkeli ngala:

I-Pr yingxolo ye-eriyali, i-K yi-Boltzmann engaguqukiyo, kwaye △f yi-bandwidth.

umfanekiso 1

Ukuba umgca wothumelo phakathi kwe-eriyali kunye nomamkeli ulahlekile, amandla esandi se-eriyali afunyenwe kule fomula ingentla kufuneka alungiswe. Ukuba iqondo lokushisa langempela lomgca wokuhambisa lifana ne-T0 phezu kobude bonke, kunye ne-coefficient yokunciphisa umgca wokuhambisa odibanisa i-antenna kunye nommkeli u-α rhoqo, njengoko kuboniswe kuMfanekiso 1. Ngeli xesha, ukushisa okusebenzayo kwe-antenna kwisiphelo sommkeli:

Apho:

I-Ta liqondo lobushushu le-eriyali kwindawo yokugqibela yomamkeli, i-TA bubushushu besandi se-eriyali kwisiphelo se-eriyali, i-TAP yiqondo lobushushu le-eriyali ephela kwiqondo lobushushu lomzimba, i-Tp liqondo lobushushu lomzimba we-eriyali, i-eA yi-eriyali esebenza ngokufanelekileyo, kwaye i-T0 bubushushu bomzimba bomgca wothumelo.
Ke ngoko, amandla esandi se-eriyali kufuneka alungiswe ukuze:

Ukuba umamkeli ngokwakhe uneqondo elithile lobushushu bengxolo T, amandla engxolo yenkqubo kwindawo yomamkeli yile:

I-Ps yinkqubo yengxolo yamandla (kwindawo yokugqibela yomamkeli), i-Ta yiqondo lobushushu le-eriyali yengxolo (kwindawo yokugqibela yomamkeli), iTr ngubushushu bengxolo yomamkeli (kwindawo yokugqibela yomamkeli), kunye ne-Ts yinkqubo esebenzayo yobushushu bengxolo (kwindawo yokugqibela yomamkeli).
Umzobo 1 ubonisa ubudlelwane phakathi kwazo zonke iiparamitha. Inkqubo esebenzayo iqondo lobushushu ingxolo Ts ye-eriyali kunye umamkeli inkqubo ngeenkwenkwezi kanomathotholo ukusuka K ezimbalwa ukuya kumawaka aliqela K (ixabiso eqhelekileyo malunga 10K), nto leyo eyahluka ngohlobo lwe-eriyali kunye umamkeli kunye frequency yokusebenza. Utshintsho kwiqondo lobushushu le-eriyali kwindawo yokuphela kwe-eriyali ebangelwa lutshintsho kwimitha ekujoliswe kuyo inokuba ncinane njengesiqingatha seshumi se-K.

Ubushushu be-eriyali kwigalelo le-eriyali kunye nendawo yokuphela kommkeli inokwahluka ngamadigri amaninzi. Ubude obufutshane okanye umgca wothumelo ophantsi welahleko unokunciphisa kakhulu lo mahluko weqondo lokushisa ube mncinci njengeshumi ezimbalwa zedigri.

RF MISOlishishini lobugcisa obuphezulu obukhethekileyo kwi-R&D kunyeimvelisoyee-eriyali kunye nezixhobo zonxibelelwano. Sizibophelele kwi-R&D, ukusungula izinto ezintsha, ukuyila, ukuveliswa kunye nokuthengiswa kwee-eriyali kunye nezixhobo zonxibelelwano. Iqela lethu liqulunqwe ngoogqirha, iinkosi, iinjineli eziphezulu kunye nabasebenzi abaphambili abanezakhono, abanesiseko esiluqilima sobuchwephesha kunye namava atyebileyo asebenzayo. Iimveliso zethu zisetyenziswa ngokubanzi kwintengiso ezahlukeneyo, imifuniselo, iinkqubo zovavanyo kunye nezinye izicelo ezininzi.