Ukukhetha imathiriyeli efanelekileyo RF PCB kubalulekile. Ichaphazela indlela isekethe esebenza ngayo, njengokugcina imiqondiso ecacileyo kunye nokulawula ubushushu. I-dielectric constant constant (Dk) phantsi kwe-4 inceda ukuphepha ukulibaziseka. I-factor dissipation factor (Df) engaphantsi kwe-0.005 inciphisa ukulahleka komqondiso. Thermal conductivity phezu 0.5 W/mK inceda ukususa ubushushu, ukumisa RF PCBs ukusuka overheating. Ezi mpawu, kunye nezinto ezomeleleyo, zenza ukuba iziphaluka zisebenze bhetele. Kukwangundoqo ukulinganisa iindleko kunye nomgangatho. Umzekelo, i-FR-4 inexabiso eliphantsi kodwa ayisebenzi kakuhle njengezixhobo eziphezulu.
IItrakthi ezibalulekileyo
Khetha izinto ezine-dielectric constant (Dk) phantsi kwe-4. Oku kunceda iimpawu zihambe ngokukhawuleza kwaye zinciphise ukulibaziseka.
Sebenzisa izixhobo ezine-dissipation factor (Df) ngaphantsi kwe-0.005. Oku kwehlisa ilahleko yamandla kwaye igcine iimpawu zomelele.
Khangela i-thermal conductivity ngaphezu kwe-0.5 W / mK. Oku kunceda ukuphatha ubushushu kwaye kunqande iisekethe ekutshiseni kakhulu.
Khetha izinto ezomeleleyo nezizinzileyo. Oku kubenza bathembeke phantsi koxinzelelo kunye neemeko ezinzima.
Thelekisa iindleko kunye nokusebenza kwezinto ezifana ne-FR-4, Rogers, PTFE, kunye nePolyimide. Zazi iingenelo neengozi zabo ukuze wenze isigqibo ngobulumko.
Imiba yokuSebenza ePhambili kwi-RF PCB Materials
I-Dielectric Constant (Dk) kunye nendima yayo kwiMfezeko yoMqondiso
The Idielectric constant (Dk) ichaphazela indlela imiqondiso ehamba ngayo kwiisekethe. Ibonisa ukuba angakanani amandla ombane anokuthi ukubamba. I-D esezantsi inceda imiqondiso ukuhamba ngokukhawuleza, okubalulekileyo kusetyenziso lwe-frequency ephezulu. Umzekelo, imathiriyeli efana ne-PTFE inexabiso eliphantsi lika Dk. Oku kuvumela imiqondiso ukuba ihambe ngokukhawuleza, ukunciphisa ukulibaziseka kunye nokunyusa ukusebenza.
Ubusazi? I-Dk ephantsi iphinda inqumle i-crosstalk phakathi kwemigca yomqondiso. I-Crosstalk yenzeka kancinane ngenxa yokuba i-mutual capacitance incinci xa ithelekiswa nokuzimela. Oku kuphucula umgangatho womqondiso.
Izinto ezino Dk ngezantsi kwe-4 zihlala zikhethelwa ii-RF PCBs. Bathoba ilahleko yomqondiso kwaye bagcina iimpawu zicacile, nto leyo ebalulekileyo kwiinkqubo ezingenazingcingo. UDkt ophantsi unceda kwakhona ukugcina i-impedance eqhubekayo, iqinisekisa ukuhamba kakuhle kwesignali.
Izibonelelo zeMathiriyeli kaDkt:
Iimpawu zihamba ngokukhawuleza.
Ukuphazamiseka kwesigaba esincinci.
Ungqinelwano olungcono lwe-impedance.
I-Loss Tangent (Df) kunye neMpembelelo yayo kwiLahleko yoMqondiso
The ilahleko tangent (Df) ibonisa ukuba angakanani amandla ajika abe bubushushu ngexesha lentshukumo yomqondiso. I-Df esezantsi ithetha ukuba amandla amancinci achithwayo, ukugcina iimpawu zomelele. Umzekelo, imathiriyeli ye-FR4 inamaxabiso e-Df phakathi kwe-0.01 kunye ne-0.02 kwiifrikhwensi ze-RF. Oku kuthetha ukuba balahlekelwa amandla amancinci kwaye basebenze ngcono.
Metric | inkcazelo |
|---|---|
Ilahleko yeTangenti | Izinto zeDf eziphantsi zigcina iimpawu zomelele ngokunciphisa ukulahleka kwamandla. |
Umqondiso weMfezeko | I-High Df ibangela ukulahleka kwamandla amaninzi, izibonakaliso ezibuthathaka. |
Ubude boMda woThutho | Imida ephezulu yeDf ukuba ingakanani na iintambo zothumelo ezinokuba kwiPCBs. |
Izixhobo ezine-Df phakathi kwe-0.0022 kunye ne-0.0095 zezona zilungele ii-RF PCBs. Bagcina imiqondiso yomelele kumgama omde kwaye bachithe amandla amancinci. Amaxabiso aphezulu eDf, nangona kunjalo, buthathaka imiqondiso kunye nokusebenza okuphantsi kwePCB kwiisekethe ezikhawulezayo.
IiPropati zeThermal kunye nokuThuthwa koBushushu
Iisekethe ezikhawulezayo zenza ubushushu obuninzi, ngoko ke ukulawula ubushushu kubalulekile. Izinto eziphathekayo ezine-thermal conductivity ngaphezu kwe-0.5 W / mK zisusa ukushisa kakuhle. Oku kuyeka ukutshisa kakhulu kwaye kugcina isiphaluka sisebenza ngokuthembekileyo.
Ngokomzekelo, ngexesha lokusebenza ngokukhawuleza, umnwe wesango le-FET unokufikelela kwi-92.6 ° C kunye ne-2.9 W yokulahlekelwa kwamandla. Ngaphandle kokususwa kakuhle kobushushu, oku kunokwaphula isixhobo. Iinjineli zisebenzisa izixhobo ezishushu kunye nokulinganisa kweRF ukujongana nezi ngxaki zobushushu.
Icebiso: Khetha imathiriyeli eneempawu ezintle zobushushu ukwenza iRF PCB yakho ihlale ixesha elide kwaye isebenze ngcono.
Ukususwa kakuhle kobushushu kwenza iiPCBs zihlale ixesha elide kwaye zigcine zisebenza kakuhle naphantsi kweemeko ezikhawulezayo.
Ukuzinza koomatshini kunye nokuqina kwizicelo ezikhawulezayo
Ukuzinza koomatshini ngundoqo ukuze ii-PCB zeRF zisebenze kakuhle. Izinto ezinamandla zifunekayo ukujongana noxinzelelo ngaphandle kokuphula isiphaluka. Izinto ezifana nokungcangcazela, ukothuka, kunye nokutshintsha kobushushu kunokonakalisa iiPCBs ekuhambeni kwexesha.
Iinjineli zivavanya ukuqina zisebenzisa uvavanyo lokungcangcazela. Kolu vavanyo, iPCB ibekwe phezu kwetafile eshukumayo kumacala ahlukeneyo. Oku kulinganisa iimeko zobomi bokwenyani, njengamaqhuma ngexesha lothutho. Ibonisa iindawo ezibuthathaka kuyilo okanye izinto eziphathekayo. Umzekelo, amalungu e-solder anokuqhekeka, okanye iindawo zinokukhululeka ukuba iPCB ayikwazi ukumelana nokungcangcazela.
Uvavanyo lomothuko lujonga ukuba ii-PCBs zijongana njani neempembelelo zequbuliso. I-PCB ibethelwa ngamandla anamandla avela kwii-engile ezahlukeneyo. Oku kulinganisa amathontsi okanye ukubetha okungenzeka kusetyenziso. Ukuba imathiriyeli okanye uyilo aluphumeleli, iPCB ayinakuhlala ixesha elide.
Iimathiriyeli nazo zifuna ukuphatha utshintsho lobushushu. Xa kushushu okanye kubanda, izinto eziphathekayo ziyanda kwaye ziyancipha. Izinto ezibuthathaka zinokuqhekeka okanye ziqhekeke ngokuhamba kwexesha. Oku kungonakalisa ukusebenza kwesekethe kwaye kuyenze ingaphumeleli ngokukhawuleza.
Ukuchola izixhobo ezomeleleyo kunceda iiRF PCBs ukuba ziphile kolu xinzelelo. I-Polyimide lukhetho olulungileyo kuba luyamelana nokunxiba kunye nokusingatha iimeko ezinzima. Isebenza kakuhle kwiindawo ezinokungcangcazela, ukothuka, okanye ukuguquka kobushushu.
Icebiso: Jonga amandla ezinto zakho zePCB ngexesha loyilo. Oku kuthintela iingxaki kamva kwaye igcina PCB yakho ethembekileyo.
Izinto eziqhelekileyo zeRF PCB kunye neempawu zazo
I-FR-4
I-FR-4 yinto eqhelekileyo kwiibhodi zeesekethe. Yenziwe ngeglasi kunye ne-epoxy, inikezela ngeendleko ezilungileyo kunye nokusebenza kakuhle. IiPCB ezininzi ezisisiseko zisebenzisa iFR-4 kuba iyafikeleleka kwaye isebenza ngokwaneleyo. Kodwa inemida kwi-high-frequency RF circuits.
The Idielectric constant (Dk) ye-FR-4 iphakathi kwe-4.2 kunye ne-4.8. Oku kuphezulu kunokulunga kwiisekethe zeRF. I- Dk ephezulu icothisa imiqondiso kwaye ibangele ukugqwesa okungakumbi. Yalo ilahleko tangent (Df) nayo iphezulu, ukusuka ku-0.01 ukuya ku-0.02. Oku kuchitha amandla kwaye buthathaka imiqondiso kwizandi eziphakamileyo.
I-FR-4 ayinkulu ekuphatheni ubushushu. I-conductivity yayo ye-thermal iphantsi, ngoko inzima ukupholisa. Oku kunokubangela ukufudumala kwiisekethe ezikhawulezayo. Nditsho nale miba, iFR-4 isathandwa kwiiprojekthi ezingabizi kakhulu apho ukusebenza kwe-frequency ephezulu kungafunekiyo.
Phawula: Sebenzisa i-FR-4 kwiisekethe ze-low-frequency okanye xa ukonga imali kubaluleke kakhulu.
Rogers Materials
Izinto zeRogers zenzelwe i-high-frequency kunye nokusetyenziswa kweRF. Basebenza ngcono kune-FR-4 ekusebenzeni kombane. Ezi zixhobo ziphantsi kwaye zizinzile Idielectric constant (Dk), ukusuka kwi-2.2 ukuya kwi-3.0. Oku kunceda imiqondiso ukuba ihambe ngokukhawuleza ngokugqwetheka okuncinci.
Rogers izinto nazo ziphantsi kakhulu ilahleko tangent (Df), rhoqo ngaphantsi kwe-0.004. Oku kugcina ilahleko yamandla isezantsi kwaye nemiqondiso yomelele, nakumaza aphezulu. Bakwaphatha kakuhle ukushisa, ukuphucula ukuthembeka kwesekethe.
Uphononongo lubonise izixhobo zikaRogers zingcono kwimisebenzi ye-frequency ephezulu kune-FR-4. Ngokomzekelo, kwi-antenna ye-5G, i-Rogers RO4350B inqumle i-crosstalk nge-90%. Oku kuphuculwe kakhulu umgangatho wophawu.
Icebiso: Khetha izixhobo zeRogers ze-5G, iisathelayithi, okanye iinkqubo ze-radar apho umgangatho wesignali ungundoqo.
Izinto eziSekwe kwi-PTFE
Izinto ezisekelwe kwi-PTFE, njengeTeflon, zilungile kwiiRF PCBs. Zineempawu ezibalaseleyo zombane zokusetyenziswa kwesantya esiphezulu kunye nesantya esiphezulu. Yabo Idielectric constant (Dk) iphakathi kwe-2.1 kunye ne-2.5. Oku kuvumela iimpawu ezikhawulezayo kunye nokulibaziseka okumbalwa.
Izinto ze-PTFE zinexabiso eliphantsi kakhulu ilahleko tangent (Df), ukusuka kwi-0.001 ukuya kwi-0.002. Oku kuthetha ukulahleka komqondiso okuncinci kunye nokusetyenziswa okungcono kwamandla kumgama omde. Bakwanciphisa ukugqwetheka komqondiso, okubalulekileyo kwi-RF amplifiers kunye nezihluzi.
Iimathiriyeli ze-PTFE ziqinile kwaye ziphatha iimeko ezigqithisileyo kakuhle. Zithembekile kwizicelo ezinzima. Nangona kunjalo, ziyabiza kwaye kunzima ukusebenza nazo kuba zithambile kwaye zibhetyebhetye.
Okuzuzwayo okuPhambili kweZixhobo eziSekwe kwi-PTFE:
Dk esezantsi kwiimpawu ezikhawulezayo.
I-Df ephantsi yokulahlekelwa kwamandla amancinci.
Yomelele kwiindawo ezirhabaxa.
Ubusazi? Izinto ze-PTFE zihlala zisetyenziswa kwi-aerospace kunye nokukhusela kuba ziqhuba kakuhle.
Izinto zePolyimide
Izixhobo zePolyimide lukhetho olukhulu lweesekethe ezikhawulezayo. Bomelele, babubamba kakuhle ubushushu, kwaye basebenza kwiindawo ezinzima. Ezi zixhobo zisetyenziswa kwiinqwelomoya, ezimotweni, nakwii-telecoms apho amandla abaluleke kakhulu.
I-plus enkulu yeepolyimides kukumelana nobushushu. Basebenza kumaqondo obushushu ukusuka -200°C ukuya ngaphezulu kwama-300°C. Bahlala bomelele nangona utshintsho olukhawulezayo lobushushu okanye ukubonakaliswa kobushushu ixesha elide. Ngokungafaniyo nezinye izinto, iipolyimides azandi kakhulu ngobushushu. Oku kugcina iinxalenye zilungelelanisiwe kwaye kumisa iingxaki zomqondiso.
Iipolyimides nazo zinzima kakhulu. Aziqhekeki, azigobi, okanye azixobuki phantsi koxinzelelo. Oku kubenza bagqibelele kwiindawo ezinokungcangcazela okanye ukubetha ngequbuliso. Ngokomzekelo, kwiimoto, ii-PCB ze-polyimide zibamba ukushukuma kweenjini kunye neempembelelo ngaphandle kokuphuka.
Ukusetyenziswa kombane, iipolyimides zizinzile Idielectric constant (Dk) kwaye iphantsi ilahleko tangent (Df). Oku kuthetha ukuba iimpawu zihlala zicacile kwaye zomelele, nakwizantya eziphezulu. Lukhetho oluphezulu lweesekethe zeRF apho umgangatho wophawu ungundoqo.
Uvavanyo lubonisa iipolyimides zihlala ixesha elide phantsi koxinzelelo lombane. Nantsi indlela asebenza ngayo:
IVV (V) | Ixesha lokungaphumeleli (imizuzwana) | MTTF (ngo-1 ppm) | MTTF (ngo-1000 ppm) |
|---|---|---|---|
1 | > 1E7 | > Iminyaka emi-24 | > Iminyaka emi-30 |
2 | < 1E7 | < 24 iminyaka | < 30 iminyaka |
3 | < 1E7 | < 24 iminyaka | < 30 iminyaka |
Le theyibhile ibonisa ukuba iipolyimides zihlala zithembekile iminyaka emininzi, nangona amandla ombane aphezulu. Ngaphezulu kweminyaka engama-24 yexesha eliqhelekileyo lokungaphumeleli (MTTF), bahlangabezana neemfuno ezinzima zokuthembeka kwiisekethe ezikhawulezayo.
Iipolyimides zibiza ngaphezu kwezinto ezifana ne-FR-4. Inkqubo yabo yokwenza inzima, yongeza ixabiso. Kodwa amandla abo, ukumelana nobushushu, kunye nokusebenza kubenza baxabiseke. Ukuba ufuna iiPCBs ezomeleleyo nezithembekileyo, iipolyimides lukhetho oluhle.
Icebiso: Khetha imathiriyeli yepolyimide yeePCB kwindawo ezishushu, ezishukumayo, okanye ezinesantya esiphezulu. Zihlala ixesha elide kwaye zigcina iisekethe zisebenza kakuhle.
Uthelekiso oluneenkcukacha lwe-RF PCB Materials
IiPros and Cons of FR-4
I-FR-4 yinto eyaziwayo kwiibhodi zeesekethe. Ixabiso eliphantsi kwaye isebenza kakuhle kusetyenziso olusisiseko. Kodwa ineengxaki kwiisekethe eziphezulu ze-frequency.
umba | eziluncedo | Imida |
|---|---|---|
ixabiso | Ixabiso eliphantsi | N / A |
Iimpahla zoMatshini | Amandla amahle | N / A |
Ukufakwa kombane | Ukugquma okufanelekileyo | Ubuthathaka phantsi kwamandla aphezulu, amandla ombane, okanye ubushushu |
I-dielectric Constant | N / A | Ukungalingani kwedielectric rhoqo kubangela imiba yokuthintela (ukuya kuthi ga kwi-10%) |
Ukuphulukana noMqondiso | N / A | Ukulahleka komqondiso ophezulu (i-Df ye-0.020 vs. 0.004 kwizinto ezingcono) |
I-FR-4 ilungile kwiisekethe eziphantsi-frequency kunye neeprojekthi ezilula. Ixabiso layo eliphantsi lenza kube lukhetho oluhle lokonga imali. Kodwa i-dielectric ephezulu rhoqo kunye nelahleko ye-tangent ibangela ukulahleka komqondiso ngakumbi. Oku kuyenza ingabi luncedo kakhulu kwiisekethe ezikhawulezayo okanye ezikwi-frequency ephezulu.
Icebiso: Khetha i-FR-4 yeebhodi ezitshiphu, kodwa hayi kuyilo lweRF olunesantya esiphezulu.
IiPros and Cons of Rogers Materials
Izinto zeRogers zenziwa kwiisekethe eziphezulu ze-frequency. Zineempawu ezingcono zombane kune-FR-4. Oku kubenza bakhulu kuyilo oluphambili.
eziluncedo | neengozi |
|---|---|
Ilahleko yombane ephantsi kakhulu | Iyakwazi ukufunxa ukufuma |
Kulula ukusika kunye nokumila | Iindleko ngaphezu kwezinye izinto |
Uchasa iikhemikhali ezisetyenziswa ekwenzeni i-PCB | Iqinile kancinci kunezinye izinto |
Isebenza kakuhle kwiimeko ezimanzi | N / A |
Izinto ezithenjwayo nezithembekileyo | N / A |
Iimpawu zombane ezihambelanayo | N / A |
Izinto zeRogers zifanelekile kwizinto ezifana ne-eriyali ye-5G kunye neenkqubo ze-microwave. I-dielectric ephantsi rhoqo kunye ne-tangent yokulahlekelwa igcina iimpawu zomelele kwaye zicacile. Kodwa zibiza kakhulu kwaye ziyakwazi ukufunxa amanzi, nto leyo enokubangela iingxaki.
Ubusazi? Izinto zeRogers zisetyenziswa kwiiprojekthi zomkhosi kunye nendawo yokuthembeka kwazo.
IiPros and Cons of PTFE-based Materials
Izinto ezisekelwe kwi-PTFE, njengeTeflon, zigqwesile kwiisekethe ezikhawulezayo neziphakamileyo. Banobuchule obumangalisayo bombane kunye nobushushu bokuphatha.
eziluncedo:
I-dielectric ephantsi kakhulu (2.1-2.5) kwiimpawu ezikhawulezayo.
Ilahleko ephantsi kakhulu ye-tangent (0.001-0.002), igcina iimpawu zomelele.
Iphatha ubushushu kunye neemeko ezinzima kakuhle kakhulu.
neengozi:
Iindleko ngaphezu kwezinye izinto.
Kunzima ukusebenza nayo kuba ithambile kwaye ibhetyebhetye.
Izinto ze-PTFE zisetyenziswa kwi-aerospace kunye nokukhusela kuba zibamba imisebenzi enzima. Bagcina imiqondiso ecacileyo nakwiimeko ezinzima. Kodwa ixabiso labo eliphezulu kunye nokuveliswa okukhohlisayo kubenza bangabi yinto eqhelekileyo kwiiprojekthi ezincinci.
Icebiso: Sebenzisa izixhobo ze-PTFE kwiisekethe ezifuna ukusebenza okuphezulu kwaye zikwazi ukusingatha iimeko ezinzima.
IiPros and Cons of Polyimide Materials
Izinto zePolyimide zinzima kwaye zisebenza kakuhle kwiisekethe ezikhawulezayo. Baneempawu ezintle kodwa kunye nezinye izinto ezisezantsi.
eziluncedo
Bamba amaqondo obushushu aphezulu kakhulu naphantsi, ukusuka ku -200°C ukuya ngaphezulu kwe 300°C.
Yomelele kwaye musa ukuqhekeka, ukugoba, okanye ukuxobula phantsi koxinzelelo.
Phakathi Idielectric constant (Dk) (2.8–4.1) igcina imiqondiso ingagungqi.
low i-disipation factor (Df) (0.003-0.01) kunciphisa ukulahleka kwamandla.
Yixhathise ukungcangcazela kunye nokothuka, nto leyo eyenza ukuba zibe zilungele iimeko ezirhabaxa.
neengozi
Ixabiso elingaphezulu kunezixhobo ezishibhile njengeFR-4.
Kunzima ukwenza, okuthatha ixesha elininzi kunye nemali.
Ukusebenza kombane kulungile kodwa akulunganga njengoko Rogers or PTFE.
Izinto zePolyimide zomelele kwaye zibamba ubushushu kakuhle. Basenokungabi ngabagqwesileyo ngandlela zonke, kodwa basebenza kakhulu kwimisebenzi enzima.
Phawula: Sebenzisa izixhobo ze-polyimide xa uyilo lwakho lufuna amandla kunye nokumelana nobushushu.
Usetyenziso Olugqwesileyo Kwisixhobo ngasinye
Khetha imathiriyeli efanelekileyo ngokusekelwe kwimfuno yeprojekthi yakho. Nasi isikhokelo esikhawulezayo:
I-FR-4: Ilungile kwiisekethe ezilula kunye nokonga imali. Isebenza kakuhle kwii-elektroniki ezisisiseko.
Rogers Materials: Eyona ilungileyo kusetyenziso lwe-frequency ephezulu njenge-5G, iradar, kunye nesathelayithi. Bagcina imiqondiso icacile kwaye yomelele.
Izinto eziSekwe kwi-PTFE: Inkulu kwi-aerospace kunye nokukhusela. Baphatha ubushushu kunye neemeko ezinzima ngelixa begcina iimpawu zigqibelele.
Izinto zePolyimide: Ilungele iimoto, iinqwelomoya, kunye neefektri. Baxhathisa ukungcangcazela, iimpembelelo, kunye notshintsho olukhulu lobushushu.
Metric | Ithetha ukuthini |
|---|---|
I-Dielectric Constant (Dk) | Inceda imiqondiso ukuba ihambe ngokukhawuleza kwaye ihlale icacile kwiisekethe. |
Umba wokuLahla (Df) | Ibonisa ukuba angakanani amandla alahlekileyo, achaphazela amandla omqondiso. |
Ukuqhuba Ukushisa | Ilinganisa indlela ubushushu obususwe ngayo, ukuyeka ukutshisa. |
I-Coefficient of Thermal Expansion (CTE) | Ibonisa ukuba ingakanani into ekhula ngayo okanye iyancipha ngokutshisa, echaphazela ukuthembeka. |
Ubushushu beGass Transition (Tg) | Ixela xa imathiriyeli isiba thambileyo, nto leyo ichaphazela ukuqina. |
Cinga ngezi zinto xa ukhetha umbandela. Ukuzithelekisa kuya kukunceda ufumane owona mxube weendleko, ukusebenza, kunye nokuthembeka.
Icebiso: Kwiisekethe ezikhawulezayo, khetha izixhobo ezine Dk kunye ne-Df ephantsi ukugcina imiqondiso yomelele.
Itheyibhile yesiShwankathelo seRF PCB Material Properties
Iimpawu eziphambili xa kuthelekiswa (umzekelo, Dk, Df, Ukuphatha ubushushu, iindleko)
Xa ukhetha izixhobo zeebhodi zeesekethe zeRF, ezinye iimpawu zibaluleke kakhulu. Ezi mpawu zichaphazela indlela imiqondiso ehamba ngayo, indlela ubushushu obulawulwa ngayo, kunye nendlela isekethe esebenza ngayo. Apha ngezantsi yitheyibhile ebonisa iimpawu eziphambili kwaye kutheni zibalulekile:
uphawu | Yintoni Eyenzayo | Unit |
|---|---|---|
I-Dielectric Constant (Dk) | Ilawula isantya somqondiso kwaye igcina i-impedance ingatshintshi. | Akukho yunithi |
I-Dielectric Loss Tangent (Df) | Ibonisa ukulahleka kwamandla; amanani asezantsi athetha iimpawu ezinamandla. | Akukho yunithi |
I-Thermal Conductivity (k) | Ilinganisa indlela izinto ezibususa ngayo ubushushu. | UW / m * K |
Ukwandiswa kweThermal (CTE) | Ixela ukuba ingakanani imathiriyeli ekhula okanye incipha ngenxa yotshintsho lobushushu. | ppm/°C |
Ubushushu beGass Transition (Tg) | Ibonisa xa into ithambile, echaphazela amandla ayo. | ° C |
Izinto eziphathekayo ezine-Dk kunye ne-Df eziphantsi zingcono kwiisekethe ezikhawulezayo. Bagcina imiqondiso ecacileyo kwaye banciphise ukulahleka kwamandla. I-conductivity ephezulu ye-thermal inceda ukususa ukushisa, ukumisa isiphaluka ekugqithiseni. Iimpawu ezifana ne-Tg kunye ne-CTE ziqinisekisa ukuba ibhodi ihlala yomelele phantsi koxinzelelo lobushushu.
Icebiso: Khetha izinto ezine-Df kunye ne-Df ephantsi kwiimpawu ezicacileyo kunye nokusebenza okungcono.
Isikhokelo esiKhawulezayo sokukhetha iMathiriyeli
Izinto ezifanelekileyo kwiibhodi zeRF zixhomekeke kwinto efunwa yiprojekthi yakho. Sebenzisa le theyibhile ukutshatisa iimpawu zemathiriyeli kuyilo lwakho:
uphawu | Kutheni le nto ibalulekile kwiiBhodi zeRF |
|---|---|
I-dielectric Constant | Inceda imiqondiso ukuba ihambe ngokukhawuleza kwaye igcine i-impedance izinzileyo. |
Ilahleko yeTangenti | Ukunciphisa ukulahleka kwamandla, ukugcina iimpawu zomelele kwaye zicacile. |
Range Ubuninzi | Utshatisa imathiriyeli kumaza okusebenza esekethe. |
Ukuphathwa kwamandla | Uqinisekisa ukuba izinto eziphathekayo zinokuphatha amanqanaba aphezulu ombane. |
CTI okanye PLC ixabiso | Ukuphucula ukuxhathisa umonakalo wombane. |
Iinqobo ze-TG kunye ne-CTE | Yongeza ukumelana nobushushu kwaye igcina ibhodi izinzile. |
Iipropati zoCando | Igcina umbandela womelele phantsi koxinzelelo. |
Ubunzima bezinto eziphathekayo | Ichaphazela indlela ibhodi eyenziwe ngayo kunye nendlela esebenza ngayo. |
Kwiiprojekthi ezingabizi kakhulu, iFR-4 lukhetho oluhle kodwa alusebenzi kakuhle kumaza aphezulu. Izinto zeRogers zinkulu kwiimpawu ezicacileyo kwi-5G kunye neenkqubo ze-radar. Izinto ezisekelwe kwi-PTFE zigqibelele kwi-aerospace kuba ziqinile kwaye zilahlekelwa ngumqondiso omncinci. Iimathiriyeli zePolyimide zomelele kwaye zibamba ubushushu, zizenza zilungele iimoto kunye neefektri.
Phawula: Khetha imathiriyeli ngokusekelwe kwiimpawu ozifuna kakhulu kuyilo lwakho. Oku kuqinisekisa ukuba isiphaluka sakho sisebenza kakuhle kwaye sihlala ixesha elide.
Ukukhetha imathiriyeli efanelekileyo yeRF PCB yakho kubaluleke kakhulu. Izixhobo ezahlukeneyo zineenzuzo kunye neengxaki zazo. Kufuneka utshatise imathiriyeli neemfuno zeprojekthi yakho. Umzekelo:
Iimathiriyeli zeRogers zilungile kwiisekethe eziphezulu ze-frequency. Zine-dielectric constants ephantsi kunye ne-tangents yelahleko kodwa zibiza ngaphezulu.
I-Teflon igcina imiqondiso ecacileyo kumaza e-GHz. Nangona kunjalo, ixabiso kwaye kunzima ukusebenza nalo.
I-FR4 inexabiso eliphantsi kwaye ilungile kwiisekethe ezisezantsi. Kodwa ayisebenzi kakuhle kuyilo lweRF oluphambili.
Xa ukhetha imathiriyeli, cinga ngezinto eziphambili ezifana neepropathi ze-dielectric, ukulahleka komqondiso, kunye noluhlu lwamaza. Le theyibhile ingezantsi icacisa ezi meko:
Umba ongundoqo | Ithetha ukuthini |
|---|---|
Iipropati zeDielectric | Ukuchaphazela indlela imiqondiso ecacileyo kunye nendlela ezihamba ngayo ngokukhawuleza. |
Ukuphulukana noMqondiso | Iimpembelelo zokusebenza kunye nokunciphisa i-bandwidth ekhoyo. |
Range Ubuninzi | Ibonisa ukuba izinto eziphambili ziyafuneka kwi-GHz-level circuits. |
Ubunzima bezinto eziphathekayo | Itshintsha indlela iPCB esebenza ngayo kwiisekethe ezikhawulezayo. |
Izinto ozikhethayo zichaphazela umgangatho wophawu, ulawulo lobushushu, kunye nexabiso. Kwiisekethe ezikhawulezayo kunye ne-high-frequency, sebenzisa izixhobo ezine-dielectric constants eziphantsi kunye nee-tangents zokulahlekelwa. Oku kunceda ukugcina imiqondiso yomelele kwaye icacile. Ngokulinganisa iindleko, ukusebenza, kunye neemfuno zeprojekthi yakho, unokuqinisekisa ukuba iRF PCB yakho isebenza kakuhle.
FAQ
Yintoni eyona nto ibalulekileyo xa ukhetha izinto zeRF PCB?
The Idielectric constant (Dk) ibaluleke kakhulu. Ilawula indlela iisignali ezikhawuleza ngayo nezicacileyo ezihamba ngayo. Izinto eziphathekayo ezino Dk eziphantsi zenza izibonakaliso zibe ngcono kwaye zinciphise ukulibaziseka. Kwiisekethe ezikhawulezayo, khetha imathiriyeli ngoDkt phantsi kwe-4.
Icebiso: Soloko ujonga uDkt ukuhambelana neemfuno zesekethe yakho.
Ngaba i-FR-4 ingasebenza kwiisekethe eziphezulu ze-frequency?
I-FR-4 ayilunganga kwiisekethe ze-frequency ephezulu. UDkt wakhe ophezulu kunye ilahleko tangent (Df) kubangela iingxaki zomqondiso kunye nenkcitho yamandla. Sebenzisa i-FR-4 kwiiprojekthi eziphantsi-frequency okanye ngexabiso eliphantsi.
Phawula: Kwiisekethe zeGHz, khetha Rogers or Izinto ezisekelwe kwi-PTFE endaweni yoko.
Ubushushu buchaphazela njani ukusebenza kweRF PCB?
I-Thermal conductivity ibonisa indlela izinto ezisusa ngayo ubushushu. I-conductivity ephezulu ye-thermal iyayeka ukushisa kwaye igcina iisekethe zisebenza. Izixhobo ezingaphezulu kwe-0.5 W/mK zingcono kwiisekethe ezikhawulezayo.
Ubusazi? Ulawulo olubi lobushushu lungonakalisa ii-PCB kwaye lunciphise ubomi bazo.
Kutheni izixhobo ze-PTFE zixabisa kangaka?
Izinto ze-PTFE zinezakhono ezimangalisayo zombane kunye nobushushu bokuphatha. Ukuzenza kunzima, kwaye zifuna ukhathalelo olukhethekileyo kuba zithambile. Oku kubenza babize ngaphezulu.
Icebiso: Sebenzisa i-PTFE kwimisebenzi ebalulekileyo efana ne-aerospace apho ukusebenza kubaluleke kakhulu.
Yintoni eyona nto ingcono kwiimeko ezinzima?
Izinto zePolyimide zilungile kwiindawo ezinqabileyo. Bajongana nobushushu obugqithisileyo, ukungcangcazela, kunye neempembelelo. Oku kubenza balungele iimoto, iinqwelomoya, kunye neefektri.
Phawula: Iipolyimides zibiza ngaphezulu kodwa zihlala ixesha elide kwiindawo ezinzima.
