Inkinga yokulahlekelwa komugqa we-coaxial

a. Lapho imvamisa yesiginali iphakeme kakhulu, umphumela wayo wesikhumba unamandla, lapho igxila kakhulu ekudluliselweni kwendawo yensimbi, indawo yokudlulisela i-cross-sectional incane, ngakho-ke i-impedance yayo inkulu, ukulahlekelwa kukhulu, ukuze kuncishiswe ukulahlekelwa, Ulayini we-RF usebenzisa izinsimbi eziyigugu (i-conductivity ephezulu, inqubo yokukhiqiza enembile, njll.).

b. Coaxial line ukulahlekelwa kuhlukaniswe ngokulahleka kwe-dielectric kanye nokulahlekelwa kwe-conductor yensimbi, okuwukulahlekelwa kwe-dielectric, ngokuvamile kudinga imvume ephansi ehlobene, i-dielectric loss angle factor incane, ukuze ukuncishiswa kube kuncane . I-medium idinga ukwakheka okungaguquki ukuze kuqinisekiswe i-impedance efanayo, ukuphakama kwemvamisa, kunzima kakhulu ukugcina i-impedance eqhubekayo, ukulahlekelwa kokubonisa kuzoba kukhulu.

1. Ukulahlekelwa kwe-Dielectric: Uma imvamisa iphezulu kakhulu, ngenxa yokuhlakazeka kwe-medium, i-dielectric constant iwumsebenzi wokuvama. Imbangela yezimpande noma izinhlayiya ezikhokhisiwe ezinenkambu kagesi eshintshanayo zinezinguquko ezihlukile. I-Dielectric coefficient enokushintsha kwe-frequency bekufanele ibe nenani eliphakeme kakhulu, kodwa ngenxa yokuthi i-coaxial line insulation iyinto engeyona i-polar, kusukela ku-low frequency ukuya ku-high frequency dielectric coefficient dispersion ibuthaka kakhulu.

2. Ukulahlekelwa kwe-coaxial: Uma sikhuluma ngokuqinile, ukulahlekelwa kwe-conductor empeleni kungahlukaniswa izingxenye ezimbili: ukulahlekelwa ukushisa kanye nokuvuza kuka-electromagnetic ngenxa yokuvikela okungaphelele, izinga elifanayo lokuvikela lamaza ahlukene omphumela wokuvikela amaza kagesi akufani, umphumela wokuvikela wefrikhwensi ephezulu awumuhle njengemvamisa ephansi. (Yebo, lena akuyona ingxenye eyinhloko yokulahlekelwa).

c. ukushona kwesikhumba δ = 1/πfuσ; indawo ephambanayo yamanje edluliswayo s = π[(r+δ)²-r²]; ukumelana nokudlulisela R = 1/σs.

Isiphetho: ----- lapho intambo ishubile, indawo ephambanayo iba nkulu, kwehla ukumelana nokudlulisela.

----- kukhulu ukuguquguquka, ukujula okuncane kwesikhumba, indawo encane ye-cross-sectional, okwandisa ukumelana nokudlulisela; i-conductivity enkulu, inciphisa ukumelana nokudlulisela; kusuka kokubili okucatshangelwayo, lokhu kokugcina kuyabusa, ngakho-ke ukuqhutshwa kukhulu, kuncane ukumelana.

----- ukuphakama kwe-frequency, kuncane ukujula kwesikhumba, kukhulu ukumelana nokudlulisela.

d. Ukuncipha futhi kube yinde i-coaxial cable, ukulahlekelwa kukhulu, futhi ukuphakama kwefrikhwensi yesignali, kwandisa ukulahlekelwa.