I-Microwave PCB Yokuxhumana Kwesathelayithi: Izidingo Zokuklama Nokuthembeka

Isingeniso

I-Microwave PCB yezinhlelo zokuxhumana ngesathelayithi idlala indima ebalulekile ekugcineni ubuqotho besignali nokuthembeka kuyo yonke imvamisa ye-L-, S-, C-, Ku-, kanye ne-Ka-band. Njengoba amasathelayithi esebenza ezindaweni ezishisayo nezinomswakama, izinto ze-PCB nezakhiwo kumele ziqinisekise ukulahleka okuncane, ukusebenza kahle kwe-dielectric okuzinzile, kanye nokuqina kwesikhathi eside. I-spectrum yemvamisa ye-microwave iletha izinselelo ezihlukile lapho ngisho nokwehluka okuncane kwezakhiwo ze-substrate noma ukubekezelelana kokwenziwa kungabangela ukuwohloka okukhulu kwesignali. Kumabhodi e-TMM e-aerospace RF hardware , ukuthengwa kufanele kuchaze ukulandeleka kwe-laminate, ukwamukelwa kobukhulu kanye namarekhodi okuhlola adingekayo ohlelweni oluthile.

Kuzinhlelo zokusebenza zesathelayithi, lawa mabhodi esekethe aphrintiwe kumele amelane nokuhamba ngamabhayisikili okubanda okwedlulele, ukuchayeka emisebeni, kanye nokucindezeleka komshini kuyilapho egcina ukulawulwa okunembile kwe-impedance kanye nokuzinza kwesigaba esikhathini sokusebenza esidlula iminyaka eyishumi nanhlanu.

Amabhendi Emvamisa Ekuxhumaneni Kwesathelayithi

Amasistimu okuxhumana ngesathelayithi asebenzisa amabhendi efrikhwensi ahlukile, ngalinye linikeza izidingo ezithile zomklamo we-microwave PCB. Amabhendi efrikhwensi aphansi ahlanganisa amasistimu okuzulazula asekela i-L-band kanye ne-S-band kanye nezinhlelo zokusebenza ze-telemetry lapho izici zokulahlekelwa okumaphakathi kanye nokungaguquki kwe-dielectric okuzinzile kwanele. Amafrikhwensi e-C-band asebenzela ukuxhumana kwesiteshi saphansi kanye nokudluliswa kwedatha yezinga eliphakathi, edinga ukulawulwa okuqinile nokungaguquguquki kwezinto.

Amasistimu we-Ku-band kanye ne-Ka-band amafrikhwensi aphezulu anika amandla ukuxhumana kwe-broadband enesivinini esikhulu nokusakaza kwevidiyo, okudinga izinto ezilahlekayo eziphansi kakhulu kanye namasu okwenziwa okunembayo ukuze kuncishiswe ukulahleka kokufakwa kanye nokuhlanekezelwa kwesigaba.

Njengoba imvamisa yokusebenza ikhula, imikhawulo yokuklama i-microwave PCB iba nzima kancane kancane. Izinhlelo zokusebenza ze-Ka-band zidinga izinto ze-substrate ezinezici zokusaphazeka ezingaphansi kuka-0.002 kanye nokubekezelelana okuphakathi kuka-±0.05 mm ukuze kugcinwe ikhwalithi yesignali eyamukelekayo.

Ukucatshangelwa Okubalulekile Kwedizayini ye-Microwave PCB kuma-Satellite Systems

Ukuzinza kweDielectric kanye Nokukhethwa Kwempahla

Ukuzinza okungaguquki kwe-dielectric kuzo zonke izimo zokushisa ezidlulele kuchaza isisekelo sokusebenza kwezinhlelo zokusebenza ze-PCB ze-microwave zesathelayithi. Ama-laminate asekelwe ku-PTFE afaka phakathi i-laminate ephansi esuselwa ku-PTFE kanye ne-laminate ye-PTFE ephansi ye-Dk ahlinzeka ngezakhiwo ze-dielectric ezizinzile ezinama-coefficients okushisa angaphansi kwama-50 ppm/°C.

Izinhlanganisela ze-PTFE ezigcwele ubumba zinikeza ukuzinza kwe-dimensional okuthuthukisiwe kanye nokwehliswa kokushisa okuncishisiwe, okubalulekile ekugcineni ukuhambisana kwesigaba ezinhlelweni ze-antenna zohlu olunezigaba. Ukukhetha okubalulekile kokwenziwa kwe-microwave PCB kufanele kuhambisane nokungaguquguquki okungaguquki kwe-dielectric kuwo wonke ama-spectrum, okuqinisekisa ukusebenza kukagesi okubikezelwe kusuka ku-L-band ngokusebenzisa ukusebenza kwe-Ka-band.

Ukulawula Impedance kanye Nobuqotho Besignali

Ukulawulwa kwe-impedance kalayini wokudlulisela kuba bucayi kakhulu njengoba amaza ama-microwave akhula. Kumafrikhwensi e-Ka-band, ukuhluka kwejiyomethri ngisho nama-micrometer angu-10 kungethula amaphutha esigaba esilinganisekayo nokungahambisani kahle kwe-impedance. Imiklamo ye-Microwave PCB idinga ukuthuthukiswa kwezitaki eziningi ezinogqinsi olulawulwa ngokunembile lwe-dielectric kanye nokucaciswa kwesisindo sethusi.

Imingcele yedizayini ebalulekile ihlanganisa:

• Ukubekezelelana okuhlangene okuqinile - Amapheya ahlukile we-impedance agcina ukwenqatshwa kwemodi evamile futhi anciphisa i-crosstalk ngokusebenzisa isikhala sokulandelela esilawulwayo.
• Ukuqhubeka kwendiza ephansi - Izindiza eziyizethenjwa ezingaphazamiseki ziqinisekisa ukuthintana okungaguquki futhi zinciphisa ukuphazamiseka kwe-electromagnetic.
• Isu ngokubeka - Ukuma kwemigodi kuthuthukisa izindlela zokubuya kwesiginali kanye nokusatshalaliswa kwensimu kuzo zonke izakhiwo zezendlalelo eziningi.

I-Loss Tangent kanye Nekhwalithi Yokuseza Konductor

I-tangent yokulahlekelwa kwe-dielectric inquma ngokuqondile ukuncishiswa kwesignali emigqeni yokudlulisela ye-microwave PCB. Izinto ezisetshenziswayo ezinezici zokulahla ezingaphansi kuka-0.001 ziba ezidingekayo ezinhlelweni zesathelayithi ye-Ka-band lapho amabhajethi ezixhumanisi acindezela ukulahlekelwa okwamukelekayo.

I-conductor surface roughness inomthelela omkhulu ekulahlekeni kokufaka kumaza ama-microwave ngomphumela wesikhumba. Ama-foil ethusi ane-Electrodeposited anamaphrofayela angaphezulu ancishisiwe anciphisa ukulahleka kwemvamisa ephezulu uma kuqhathaniswa nethusi eligoqiwe elijwayelekile. Ushintsho olusuka ezindaweni ezimangelengele ukuya endaweni yethusi ebushelelezi lunganciphisa ukulahlekelwa kokufaka ngo-20-30% kumasekhethi e-Ku-band kanye ne-Ka-band.

Ukuphathwa Okushisayo ku-Microwave PCB Yezicelo Zesathelayithi

Vacuum Environment Heat Dissipation

Ama-PCB e-microwave esathelayithi asebenza ezindaweni zokuhlanza lapho kungekho khona ukudluliselwa kokushisa okuhambisanayo, athembele kuphela ekuqhutshweni komoya kanye nemisebe yokulawula ukushisa. Amamojula we-Power amplifier akhiqiza ama-watts angu-50-100 okushisa adinga izindlela zokushisa ezisebenzayo ukuvimbela ukuhamba kwezinga lokushisa kwe-junction okonakalisa ukuthembeka.

Amabhodi esekethe e-Metal-core aphrintiwe ane-aluminium noma ama-substrates ethusi ahlinzeka ngokuqhutshwa kwe-thermal okuthuthukisiwe uma kuqhathaniswa namalayithi ajwayelekile e-PTFE. I-Thermal vias ebekwe kahle ngaphansi kwezingxenye zamandla aphezulu idala izindlela ezisebenzayo ngokusebenzisa izendlalelo ze-dielectric ze-thermal-conductivity, ukuthuthukisa ukusakazeka kokushisa kumasinki okushisa afakwe ku-chassis.

I-Coefficient of Thermal Expansion Matching

I-coefficient yokungezwani kokwanda okushisayo phakathi kwama-microwave PCB substrates, ama-copper conductor, namaphakheji engxenye adala ingcindezi ye-thermomechanical ngesikhathi sokuhamba kwamabhayisikili. Amasistimu wesathelayithi athola ukushintsha kwezinga lokushisa ukusuka ku--55°C ngezikhathi zokusitheka kwelanga ukuya ku-+125°C ngaphansi kokukhanya okuqondile kwelanga.

Izinto ezisekelwe ku-PTFE zibonisa amanani e-CTE angu-50-70 ppm/°C ku-axis ye-Z, ephakeme kakhulu kunekhopha engu-17 ppm/°C namaphakheji e-ceramic ku-6-8 ppm/°C. Lokhu kushayisana kwenza kube nokuqhekeka komgqomo wembobo nokukhathala ngokuhlanganyela phezu kwezinkulungwane zemijikelezo yokushisa. Izinhlanganisela ezigcwele i-Ceramic zinciphisa i-CTE ku-30-40 ppm/°C, okwenza ngcono ukwethembeka kwesikhathi eside.

I-Thermal Interface Optimization

Imihlangano ye-Microwave PCB idinga ukuxhumana okuthuthukisiwe okushisayo phakathi kwama-substrates nezakhiwo ezisakaza ukushisa. Izinto zokusebenzelana ezishisayo kufanele zigcine ukusebenza endaweni engenalutho enezici eziphumayo ezihlangabezana nezidingo ze-ASTM E595.

Izixazululo ezibalulekile zokuphatha i-thermal zihlanganisa:

• Amaphedi ashisayo asuselwa ku-graphite -Izindawo zokuhlangana ezithobelanayo zithatha ukuhluka kokunwebeka okushisayo ngenkathi kugcinwa ukusebenza okungaphezulu kuka-5 W/mK.
• Izinto zokushintsha isigaba - Izinhlanganisela ezicushwe yizinga lokushisa zihambisana nokungahambi kahle kwendawo ukuze kuthuthukiswe ukuthintana okushisayo.
• Ukuhlanganiswa kwe-substrate okuqondile - Izinamatheliso ze-epoxy zakha izindlela ezishisayo ezihlala njalo ezithwala insimbi ngokusebenza okuthuthukisiwe kokudlulisa ukushisa.

Ukuthembeka kanye Nezidingo Zebanga Lendawo

Izinto ze-PCB ze-microwave ezifanelekile endaweni zihlolwa kanzima okuhlanganisa ukujikeleza kwe-vacuum okushisa, ukufaneleka kokudlidliza, kanye nokuhlukaniswa kwegesi. Izinto kumele zibonise ukulahlekelwa okuphelele kwesisindo ngaphansi kuka-1% futhi ziqoqe izinto eziguquguqukayo ezinamathelayo ngaphansi kuka-0.1% ngokwezindinganiso ze-ASTM E595 ukuvimbela ukungcoliswa kwezinhlelo zokukhanya kanye nama-radiator okushisa.

Ukuqedwa kobuso okuhlanganisa i-electroless nickel electroless palladium immersion gold kunikeza ukumelana ne-oxidation nempilo yeshelufu eyandisiwe engaphezu kweminyaka eyishumi. Imvelo yemisebe enokhahlo ku-geostationary and medium Earth orbits idinga izinto ezimelana nomoya-mpilo we-athomu kanye nokuwohloka kwe-ultraviolet. Ukuhlolwa kokufaneleka kwedizayini kuqinisekisa ukusebenza kwe-microwave PCB phakathi nobuncane besikhathi semishini yeminyaka eyi-15 ngamamajini okuphepha afanelekile.

Ukukhiqiza Nokuhlola Ukucatshangelwa kweMicrowave PCB

Izidingo Zokwenziwa Ngokunembayo

Ukwenziwa kwe-PCB ye-microwave kudinga ukubhoboza ngokunemba okunezimo ezingaphakathi kwama-micrometer angu-±25 kanye nokubhoboza okujulile okulawulwayo kwama-vias angaboni ezakhiweni eziningi. Izinqubo zokubopha zidinga ingcindezi eqondile kanye namaphrofayili okushisa ukuze kufezwe ukujiya kwe-dielectric okuqondiwe ngenkathi kunciphisa izikhala kanye nokwehluka kokugeleza kwe-resin.

Izinto ezisetshenziswayo ze-high-frequency substrate ziletha izinselelo eziyingqayizivele zokusebenzisa imishini ngenxa yokuthamba kwazo kanye nokuthambekela ekungeneni kwe-delamination ngesikhathi sokumba. Amathuluzi akhethekile kanye nemingcele yokusika eyenziwe kahle ivimbela ukulimala kwezinto futhi igcina ukunemba kobukhulu.

Ukuhlolwa kukagesi kanye Nokuqinisekisa

Izilinganiso zokuhlaziya inethiwekhi ziqinisekisa amapharamitha e-S okuhlanganisa ukulahlekelwa kokufaka, ukulahlekelwa ukubuyisela, nokulibaziseka kweqembu kuwo wonke amabanga okusebenza. Ukuhlolwa kwe-Flying probe kuqinisekisa ukuqhubeka kwesekethe kuyilapho kugwema ama-resonances abangelwa ukulungiswa abeka engcupheni ukunemba kokulinganisa kumaza ama-microwave.

Izinqubo zokuhlola zihlanganisa:

• Ukulinganisa kwepharamitha ye-S - Ukuhlaziywa kwenethiwekhi yeVector kuqinisekisa ukufaniswa kwe-impedance kanye nekhwalithi yokudlulisela kusuka ku-DC kuya ku-Ka-band.
• Isikhathi-yesizinda reflectometry - Ihlonza ukungaqhubeki kwe-impedance futhi ithole amaphutha okukhiqiza emigqeni yokudlulisela.
• Ukuqinisekiswa kokuhamba ngebhayisikili okushisayo - Iqinisekisa ubuqotho obuhlangene be-solder nokuzinza kwempahla kuwo wonke amazinga okushisa okusebenza.

Izicelo Ezijwayelekile Ezinhlelweni Zesathelayithi

Ubuchwepheshe be-Microwave PCB bunika amandla amasistimu angaphansi abalulekile okuxhumana ngesathelayithi okuhlanganisa amanethiwekhi okuphakelayo kwezinti asabalalisa amasiginali ukuze ahlele izinto ezinobude obulawulwayo kanye nobudlelwano besigaba. Isixhumi esibonakalayo se-Waveguide-to-microstrip transition circuits phakathi kwezingxenye ze-waveguide engunxande nemigqa yokudlulisa epulaniwe kumabhodi esekethe aphrintiwe.

Amamojula we-Power amplifier ahlanganisa ama-transistors anamandla aphezulu namanethiwekhi afana ne-impedance kanye ne-bias control circuitry kuma-substrates athuthukiswe ngokushisa. Amamojula wokudlulisa nokwamukela ahlanganisa ama-amplifier anomsindo ophansi, ama-phase shifters, kanye namanethiwekhi okushintshana kuma-compact assemblies asekela izinhlelo ze-antenna ze-phased array.

Isiphetho

Idizayini ye-PCB ye-microwave ethuthukisiwe isebenza njengesisekelo esibalulekile sezinhlelo zokuxhumana zesathelayithi ezithembekile ezisebenza ukusuka ku-L-band kuya ku-Ka-band frequency range. Ukuthola ukusebenza kahle kudinga ukuhlanganiswa okunebhalansi kwezinto ezilahlekelwa kakhulu, ukuphatha okushisayo okuphumelelayo, nokwakhiwa okunembayo - ukuqinisekisa ukusebenza okungaguquguquki kuyo yonke imihlangano yesikhathi eside.

Kwa-Highleap Electronics, sisebenza ngokukhethekile ku-:

• Izinto ze-dielectric ezilahlekelwa kancane ukuze kube nobuqotho besignali obuzinzile kuwo wonke ama-frequency band.

• I-lamination enezingqimba eziningi enembile kanye nokulawulwa kwe-impedance okuqinile kwezakhiwo ze-RF eziyinkimbinkimbi.

• Ukwethenjelwa kokushisa okuthuthukisiwe ngokushabalalisa ukushisa okuthuthukisiwe kanye namasu okuklama.

• Ukusekelwa okuphelele kobunjiniyela kusukela ekubonisaneni ngokuklama kuya ekuhlolweni kweziqu.

Ngalezi zikhono, sisiza abathuthukisi bezokuxhumana ngesathelayithi ukuthi bafeze izixazululo ze-PCB ezincane nezisebenza njalo ezihlangabezana nezindinganiso zokusebenza ezidingayo kanye nokuthembeka. Xhumana ne-Highleap Electronics namuhla ukuze uxoxe ngephrojekthi yakho elandelayo ye-PCB yesathelayithi noma ye-microwave.