Liyini ithusi?
Okubizwa ngokuthi ukuthululela kwethusi ukusebenzisa indawo engasetshenziswanga ebhodini lesifunda njengendawo yokubhekisela bese uyigcwalisa ngethusi eliqinile. Lezi zindawo zethusi zibizwa nangokuthi ukugcwaliswa kwethusi.
Ukubaluleka kwe-copper coating ukunciphisa i-impedance yocingo oluphansi nokuthuthukisa ikhono lokulwa nokuphazamiseka; ukunciphisa ukwehla kwamandla kagesi futhi kuthuthukise ukusebenza kahle kokunikezwa kwamandla; ukuxhuma ngocingo lwaphansi nakho kunganciphisa indawo eyiluphu.
Futhi ngenjongo yokwenza i-PCB ingahlanekezelwe ngangokunokwenzeka ngesikhathi sokudayiswa, abakhiqizi abaningi be-PCB bazophinde badinge abaklami be-PCB ukuthi bagcwalise izindawo ezivulekile ze-PCB ngezintambo zomhlabathi zethusi noma ezinjengegridi. Uma ithusi lisingathwa ngendlela efanele, liyoba Uma inzuzo ingakufanelekeli ukulahlekelwa, ingabe ukumbozwa kwethusi “kunezinzuzo eziningi kunezimo ezimbi” noma “okubi kunezinzuzo”?
Wonke umuntu uyazi ukuthi ngaphansi kwezimo zemvamisa ephezulu, i-capacitance esabalalisiwe ye-wiring ebhodini lesifunda ephrintiwe izosebenza. Uma ubude bukhulu kuno-1/20 we-wavelength ehambisanayo yefrikhwensi yomsindo, umphumela we-antenna uzokwenzeka, futhi umsindo uzokhishwa ngezintambo. Uma kukhona ukuthululelwa kwethusi eliphansi kahle ku-PCB, ukuthululela kwethusi kuba yithuluzi lokusabalalisa umsindo.
Ngakho-ke, kumjikelezo we-high-frequency, ungacabangi ukuthi ucingo oluphansi luxhunywe phansi. Lona "intambo ephansi". Kuyadingeka ukubhoboza izimbobo ku-wiring ngesikhala esingaphansi kuka-λ/20. Indiza ephansi ye-laminate "umhlabathi omuhle". Uma ukugqoka kwethusi kusingathwa kahle, ukugqoka kwethusi akugcini nje ukwandisa okwamanje, kodwa futhi kudlala indima emibili yokuphazanyiswa kokuvikela.
Izinhlobo ezimbili ze-copper coating
Ngokuvamile kunezindlela ezimbili eziyisisekelo zokumboza ithusi, okuyi-copper yendawo enkulu kanye ne-grid yethusi. Kuvame ukubuzwa ukuthi ukugqoka kwethusi kwendawo enkulu kungcono kunegridi yethusi. Akulungile ukuhlanganisa yonke into.
ngani? I-copper yendawo enkulu inemisebenzi emibili yokwandisa amandla amanje nokuvikela, kodwa uma i-copper yendawo enkulu isetshenziselwa ukuhlanganisa amagagasi, ibhodi lingase liphakamise ngisho namabhamuza. Ngakho-ke, ukuze kuhlanganiswe indawo yethusi enkulu, ama-grooves amaningana avame ukuvulwa ukuze akhulule ama-blistering of the foil yethusi. Njengoba kuboniswe ngezansi:
Igridi ye-copper-clad ehlanzekile isetshenziselwa ikakhulukazi ukuvikela, futhi umphumela wokwandisa okwamanje uyancipha. Ngokombono wokukhipha ukushisa, igridi inhle (inciphisa indawo yokushisa yethusi) futhi idlala indima ethile ekuvikeleni i-electromagnetic. Ikakhulukazi kumasekhethi afana nokuthinta, njengoba kukhonjisiwe ngezansi:
Kufanele kuphawulwe ukuthi igridi yenziwe ngokulandela umkhondo ezindaweni ezimile. Siyazi ukuthi kumjikelezo, ububanzi bomkhondo bunobude obuhambisanayo "kagesi" wemvamisa yokusebenza yebhodi lesifunda (usayizi wangempela uhlukaniswe Imvamisa yedijithali ehambisana nemvamisa yokusebenza iyatholakala, bheka izincwadi ezihlobene ukuze uthole imininingwane. ).
Uma imvamisa yokusebenza ingephezulu kakhulu, mhlawumbe umphumela wemigqa yegridi awubonakali kakhulu. Uma ubude bukagesi bufana nemvamisa yokusebenza, kuzoba kubi kakhulu. Uzothola ukuthi isekethe ayisebenzi kahle nhlobo, futhi uhlelo lukhipha ukuphazamiseka yonke indawo. isignali ye.
Isiphakamiso ukukhetha ngokuvumelana nezimo zokusebenza zebhodi lesifunda eliklanyelwe, ungabambeli entweni. Ngakho-ke, izifunda ze-high-frequency zinezidingo eziphakeme zamagridi ezinhloso eziningi zokulwa nokuphazamiseka, futhi ama-circuits aphansi-frequency aneziyingi ezinemisinga emikhulu, njengethusi eliphelele elivame ukusetshenziswa.