Inkcazo ye high-frequency ibhodi PCB

Ibhodi yokuhamba rhoqo ibhekisa kwibhodi yesekethe ye-electromagnetic frequency frequency board, esetyenziswa kumaza aphezulu (amakhulu kune-300 MHZ frequency okanye wavelength ingaphantsi kwe-1 mitha) kunye ne-microwave (enkulu kune-3 GHZ frequency okanye wavelength ingaphantsi kwe-0.1 yeemitha) kwicandelo I-PCB, ikwisithuba se-microwave esambethe ubhedu isebenzisa indlela eqhelekileyo yokuvelisa ibhodi yesekethe yenxalenye yenkqubo okanye ukusetyenziswa kweendlela ezizodwa zokulungisa kunye nokuveliswa kweebhodi zesekethe. Ngokubanzi, iibhodi ezihamba rhoqo zinokuchazwa njengeebhodi zesekethe ezinamaza angaphezu kwe-1GHz.

Ngophuhliso olukhawulezayo lwenzululwazi kunye netekhnoloji, uyilo lwezixhobo ngakumbi nangakumbi kukwibhendi ye-microwave (> 1GHZ) kunye nakwintsimi ye-millimeter wave (30GHZ) ngaphezulu kwesicelo, oko kukwathetha ukuba ubude buphezulu kwaye buphezulu, i-substrate zeemfuno zebhodi yesekethe zikwindawo ephezulu kwaye ephezulu. Umzekelo, izinto ze-substrate kufuneka zibeneempawu zombane ezigqwesileyo, uzinzo lweekhemikhali olulungileyo, kunye nokunyuka kwesantya samandla ombane kwiimfuno zelahleko ze-substrate zincinci kakhulu, ke ukubaluleka kwepleyiti yokuhamba rhoqo kuphakanyisiwe.

Ucalulo PCB ipleyiti eliphezulu

1, ekupheleni kwezinto ze-ceramic ezizalisiweyo ze-thermosetting

Indlela yokucwangcisa:

Kwaye epoxy nentlaka / iglasi ngelaphu ephothiweyo (FR4) inkqubo processing efanayo, kodwa ipleyiti brittle ngakumbi, kulula ukuba aphule, ukubhola kunye gong ipleyiti drill umlomo ngemilomo nobomi gong imela kuyehla nge-20%.

2. Izinto ze-PTFE (polytetrafluoroethylene)

Indlela yokucwangcisa:

1. Ukuvulwa kwezinto: Ifilimu ekhuselayo kufuneka igcinwe ukuthintela ukukrwela kunye nokungena ngaphakathi

2. Uqheliso:

2.1 Sebenzisa i-drill entsha (standard 130), iqhekeza elinye elibekiweyo lelona lifanelekileyo, uxinzelelo lweenyawo zenyawo yi-40psi

2.2 Iphepha leAluminiyam njengeplate yokugubungela, emva koko sebenzisa i-1mm eshinyeneyo yeplate ye-amine, qinisa ipleyiti ye-PTFE

2.3 Vuthulula uthuli emngxunyeni ngompu womoya emva kokugrumba

2.4 Ngowona mgangatho uzinzileyo wokugrumba, iiparameter zokomba (ngokusisiseko, umngxunya umncinci, isantya sokugrumba esikhawulezayo, umthwalo omncinci weChip, umncinci ukubuya)

3. Ukulungiswa komngxunya

Unyango lwePlasma okanye unyango lwe-sodium-naphthalene luncedo ekusebenziseni i-pores

4. I-PTH isinki yobhedu

4.1 Emva kokurhawuzelelwa okuncinci (inqanaba lokutsalwa okuncinci lilawulwa zii-intshi ezingama-20), ipleyiti ityiswa kwisilinda esusa isilinda kwi-PTH

4.2 Ukuba kukho imfuneko, hamba uye kwi-PTH yesibini, ukusuka kuqikelelo nje? Isilinda yaqala ukungena kwipleyiti

5. Ukudibanisa ukuxhathisa

5.1 Pre-unyango: sebenzisa ipleyiti ukuhlamba acid endaweni ipleyiti lokusila ngoomatshini

5.2 Emva konyango lwangaphambili, bhaka ipleyiti (90 ℃, 30min), brasha ioyile eluhlaza kunye nonyango

5.3 Iipleyiti ezintathu zokubhaka: enye yi-80 ℃, 100 ℃ kunye ne-150 ℃ ye-30min inye (ukuba i-oyile ifunyenwe kumphezulu womhlaba, inokuphinda isetyenzwe: hlamba ioyile eluhlaza kwaye uyivuselele kwakhona)

6. Ibhodi yegong

Beka iphepha elimhlophe kumphezulu webhodi ye-PTFE, kwaye ulibambe ngeplate yesiseko se-fr-4 okanye ipleyiti yesiseko se-phenolic enobunzima be-1.0mm kunye nokususwa kobhedu: Njengoko kubonisiwe kumzobo:

Zithini iibhodi ezihamba rhoqo zePCB? I-PCB yokuhlelwa kwepleyiti ephezulu

Ukuhamba rhoqo kunye nezinto ezinesantya esiphezulu sephepha

Xa ukhetha i-substrate ye-PCB yeesekethe ezihamba rhoqo, kufuneka kuthathelwe ingqalelo ekhethekileyo kwiimpawu zokwahluka kwezinto ze-DK kumaxesha ahlukeneyo. Kwiimfuno zokuhanjiswa kwesantya esiphezulu okanye ulawulo lwe-impedance, uphawu lwe-DF kunye nokusebenza kwayo phantsi kweemeko zokuhamba rhoqo, ubushushu kunye nokufuma ziphandwa ikakhulu.

Ngaphantsi kwemeko yokwahluka rhoqo, i-DK kunye ne-DF yamaxabiso ezixhobo ze-substrate ngokubanzi zitshintsha kakhulu. Ngokukodwa kuluhlu lwamaxesha ukusuka kwi-L MHz ukuya kwi-L GHz, amaxabiso abo e-DK kunye ne-DF atshintsha ngokucacileyo. Umzekelo, GENERAL epoxy-glass fiber substrate material (general FR-4) ine-DK value of 4.7 at lMHz and DK value of 4.19 at lGHz. Ngaphezulu kwe-lGHz, ixabiso layo le-DK litshintsha kancinci. Umzekelo, phantsi kwe-l0GHz, ixabiso le-DK le-FR-4 ngu-4.15. Kwizinto ze-substrate ezinesantya esiphezulu kunye neempawu zokuhamba rhoqo, ixabiso le-DK litshintsha kancinane. Ukusuka kwi-lMHz ukuya kwi-lGHz, ixabiso le-DK ubukhulu becala lihlala kuluhlu lwe-0.02. Ixabiso le-DK lithanda ukwehla kancinci kumaqondo ahlukeneyo ukusuka ezantsi ukuya phezulu.

Izinto ezilahlekileyo ze-dielectric factor (DF) yezixhobo ze-substrate ngokubanzi zinkulu kunezo ze-DK ngenxa yefuthe lokwahluka kwamaza (ngakumbi kuluhlu oluphezulu lokuhamba). Ke ngoko, xa sivavanya ezona mpawu ziphakamileyo zezixhobo ze-substrate, kuya kufuneka sigxile kutshintsho lwexabiso le-DF. Izinto ze-substrate ezinesantya esiphezulu kunye neempawu zokuhamba rhoqo zicacile ukuba zahlukile kwizinto ze-substrate ngokubanzi ngokweempawu zokwahluka kumaza aphezulu. Inye kukuba kutshintsho lwamaxesha, ixabiso lalo (DF) litshintsha kakhulu. Enye into iyafana nezinto ezikwisakhelo ngokubanzi kuluhlu lokwahluka, kodwa ixabiso lalo (DF) lisezantsi.

Ungayikhetha njani ipleyiti yesantya esiphezulu

Ukukhethwa kwebhodi ye-PCB kufuneka kuhlangane neemfuno zoyilo, ukuveliswa kobunzima kunye neendleko zebhalansi phakathi. Ngamafutshane, iimfuno zoyilo zinamacandelo amabini: ukuthembeka kombane kunye nolwakhiwo. Oku kuhlala kubalulekile xa kuyilwa iibhodi zePBB ezihamba ngesantya esiphezulu (amaza amakhulu kune-GHz). Umzekelo, izinto ze-fr-4 ezisetyenziswa ngokuxhaphakileyo namhlanje zisenokungasebenzi ngenxa ye-Df yayo enkulu (i-Dielectricloss) kwii-frequency ezininzi ze-GHz.

Zithini iibhodi ezihamba rhoqo zePCB? I-PCB yokuhlelwa kwepleyiti ephezulu

Umzekelo, i-10Gb / S yesantya esiphakamileyo somqondiso yitshati yesikwere, enokuthi ithathelwe ingqalelo njenge-superposition yeempawu zesinusoidal zamaza ahlukeneyo. Ke ngoko, i-10Gb / S iqulethe imiqondiso eyahlukeneyo yamatyeli: I-5Ghz uphawu olusisiseko, i-3 order 15GHz, 5 order 25GHz, 7 order 35GHz signal, njl. Ukunyaniseka kwesiginali yedijithali kunye nokunyuka kwamanqwanqwa aphezulu nasezantsi kuyafana nelahleko esezantsi kunye nokusasazeka kokugqwetha okuphantsi kwe-rf microwave (inqanaba eliphezulu le-harmonic yesiginali yedijithali ifikelela kwibhanti ye-microwave). Ke ngoko, kwiinkalo ezininzi, ukhetho lwezinto ze-PCB zesekethe ezihamba ngesantya esiphezulu ziyafana neemfuno zesekethe ze-microwave zeRF.

Zithini iibhodi ezihamba rhoqo zePCB? I-PCB yokuhlelwa kwepleyiti ephezulu

Kwimisebenzi yobunjineli ebonakalayo, ukhetho lweepleyiti ezihamba rhoqo lubonakala lulula, kodwa zininzi izinto ekufuneka ziqwalaselwe. Ngokwaziswa kweli phepha, NJENGENJineli yoyilo lwe-PCB okanye inkokeli yeprojekthi ekhawulezayo, ndinokuqonda okuthile kweempawu kunye nokukhethwa kwamacwecwe. Qonda iipropathi zombane, iipropathi ezishushu, ukuthembeka, njl. Kwaye ukusebenzisa ubungqongqo be-stacking, uyile isiqwenga sokuthembeka okuphezulu, iimveliso ezilungileyo zokwenza izinto, izinto ezahlukeneyo zokujonga ezona zilungileyo.

Oku kulandelayo kuyakwazisa ezona zinto ziphambili ekufuneka ziqwalaselwe ekukhetheni ipleyiti efanelekileyo:

1, ukuvelisa:

Njengokusebenza ngokucinezela okuninzi, ukusebenza kweqondo lobushushu, i-CAF / ukumelana nobushushu kunye nokuqina komatshini (i-viscosity) (ukuthembeka okuhle), ukulinganiswa komlilo;

2, kunye nokusebenza kwemveliso ehambelana (umbane, ukuzinza kokusebenza, njl.):

Ukulahleka okuphantsi, iiparitha ezizinzileyo zeDkt / Df, ukusasazeka okuphantsi, utshintsho oluncinci lomlingani kunye nokuhamba rhoqo kunye nokusingqongileyo, unyamezelo oluncinci lobunzima bezinto kunye nomxholo werabha (ulawulo lwe-impedance elungileyo), ukuba ucingo lude, jonga uburhabaxa obuphantsi befoyile yobhedu. Ukongeza, ukulinganisa kuyafuneka kwinqanaba lokuqala loyilo lwesantya esiphezulu, kwaye iziphumo zokulinganisa yimigangatho yesalathiso kuyilo. “Itekhnoloji yeXingsen-Agilent (isantya esiphezulu / isantya seRADIO) ilabhoratri edibeneyo” isombulule ingxaki yokusebenza kweziphumo zokulinganisa ezingahambelaniyo kunye novavanyo, kwaye yenza inani elikhulu lokulinganisa kunye novavanyo lokwenyani lokungqinisisa okuvaliweyo, ngendlela eyodwa yokufezekisa ukungqinelana Ukulinganisa kunye nomlinganiso.

Zithini iibhodi ezihamba rhoqo zePCB? I-PCB yokuhlelwa kwepleyiti ephezulu

3. Ukufumaneka kwezinto ngexesha elifanelekileyo:

Uninzi lomjikelo wokuthengwa kwepleyiti ephezulu kakhulu lide kakhulu, kwaneenyanga ezi-2-3; Ukongeza kwipleyiti yamaxesha aphezulu aqhelekileyo i-RO4350 ine-inventri, uninzi lweepleyiti ezihamba rhoqo kufuneka zibonelelwe ngabathengi. Ke ngoko, ipleyiti yamaza aphakamileyo kunye nabavelisi kufuneka banxibelelane kwangoko kwangoko, ngokukhawuleza;

4. Iindleko:

Kuxhomekeke kubuntununtunu bexabiso lemveliso, nokuba yimveliso yabathengi, okanye unxibelelwano ngocingo, ezonyango, ezamashishini, ezomkhosi;

5. Ukusebenza kwemithetho nemimiselo, njl.

Ukuhambelana nemigaqo yokusingqongileyo yamazwe ahlukeneyo kunye nokuhlangabezana neemfuno zeRoHS kunye ne-halogen-free.

Phakathi kwezi zinto zingentla, isantya esisebenza ngesantya esiphezulu kwisekethe yedijithali yeyona nto iphambili ekufuneka uyiqwalasele kukhetho lwePCB. Ukuphakama kwesantya sesekethe, kuncinci ixabiso elikhethiweyo le-PCBDf. Ipleyiti yesekethe enolahleko ophakathi kunye nophantsi iya kulungela isekethe ye-10Gb / S yedijithali; Ipleyiti enelahleko esezantsi ilungele i-25Gb / s yesekethe yedijithali; Iiphaneli ezineelahleko eziphantsi kakhulu ziya kuhlala ngokukhawuleza, isantya esiphezulu kwiisekethi zedijithali kumaxabiso e-50Gb / s okanye ngaphezulu.

Ukusuka kwimathiriyeli Df:

Df phakathi kwe-0.01 ~ 0.005 ibhodi yesekethe efanelekileyo kumda ophezulu we-10Gb / S wesekethe yedijithali;

Df phakathi kwe-0.005 ~ 0.003 ibhodi yesekethe efanelekileyo kumda ophezulu we-25Gb / S wesekethe yedijithali;

Iibhodi zesekethe ezine-Df ezingekho ngaphezulu kwe-0.0015 zilungele i-50Gb / S okanye isantya esiphezulu seesekethe zedijithali.

Iipleyiti ezinesantya esiphezulu ezisetyenziswayo zezi:

1), Rogers: RO4003, RO3003, RO4350, RO5880, njl

2), iTaiyao TUC: Tuc862, 872SLK, 883, 933, njl

3), iPanasonic: Megtron4, Megtron6, njl

4), Isola: FR408HR, IS620, IS680, njl

5) Nelco: N4000-13, N4000-13EPSI, njl

6), Dongguan Shengyi, Taizhou Wangling, Taixing Microwave, njl