Mitemo yeHF PCB yekugadzira uye yekugadzira

Kusiyana kwese kuripo pakati pemuenzaniso wako wekutevedzera nebhodhi rakagadzirwa kune mhedzisiro yeRF. Pa2 GHz, mhedzisiro yacho inowanzo kuve mukati meruzha. Pa24 GHz, 0.02 mm trace width error inoshandura impedance 2Ω, foil yemhangura yakajairwa inowedzera 0.3 dB/inch yekurasikirwa kweconductor iyo simulation yako isina kufanotaura, uye solder mask inovhara netsaona tambo yekutumira inoisa dielectric loading effect inochinja frequency ye resonant yeantenna yako. Kubudirira kwekugadzira nekugadzira kweHF PCB kunoda kuti mugadziri anzwisise zvinogona uye zvisingagoni kudzora fekitori - uye kuita sarudzo dzekugadzira dzinoenderana nezviri kugadzirwa pane kuzvirwisa. Chinyorwa ichi chinoratidza nzvimbo chaidzo apo sarudzo dzekugadzira dzePCB dzepamusoro-soro dzinosangana nemiganhu yekugadzira, zvichipa gwara rinogona kuitwa kune mainjiniya eRF anoshanda kuti abudirire pakutanga.

1) Nei Kutevedzera uye Kugadzira Zvichisiyana paMabhodhi Epamusoro-soro

1.1 Manyuko Mashanu Ekusawirirana

Yese EM simulator inofungidzira kuti ine geometry yakakwana kunze kwekunge yakagadziridzwa zvakajeka neimwe nzira. Bhodhi chairo rinounza nzira shanu dzekutsauka dzakarongwa:

Manyuko mashanu aya anosanganiswa. Kana zvanyanya kuipa, anogona kushandura impedance ne5–8Ω kubva pane zvaunovavarira kuita simulation — zviri nyore kupfuura ±5% tolerance pamutsetse we50Ω. Mhinduro haisi ye tolerance dzakasimba dzekugadzira (dzinowedzera mutengo uye dzinoderedza goho) asi ma simulation models akagadziriswa zviri nani anosanganisira data chaiyo yekugadzira kubva kumugadziri wako.

1.2 Mhinduro Inoshanda: Shandisa Ruzivo rweMugadziri muSimulation Yako

Kumbira kubva kumugadziri wako usati watanga kuronga:

• Ndakayera Drk kubva muzvigadzirwa zvitsva pane zvawakaita (kwete datasheet yakajairika)
• Chinhu cheEtch chehuremu hwemhangura yako pazvinhu zvako
• Foil yemhangura Rz yerudzi rwefoil yavachashandisa
• Kusvika pakukora kwe dielectric (kwakayerwa, kwete kwemazita) kwepakati pako uye prepreg

Isa mavalues ​​aya mu field solver yako (Polar SI, Ansys HFSS, Simbeor). Kurudziro ye trace width ichauya ichagadzira impedance iri pedyo zvakanyanya ne target pane prototype yekutanga.

2) Kugadzira Mutsetse weTransmission: Kushanda Mukati Memiganhu Yekugadzira

2.1 Saizi Dzezvinhu Zvishoma Nemaitiro

Mazhinji ekugadzira HF PCB anoshandisa etching yakajairwa kana kuti yakapfava. Gadzira upamhi hwetrace yako nemuganhu wakakwana kupfuura muganho wepazasi — 50Ω microstrip pahupamhi hwe0.15 mm pamhangura ye1 oz inogoneka asi inosiya zero process margin. Dhizaini pahupamhi hwe0.20 mm pamhangura ye0.5 oz inopa mukana wakawanda uye kutonga zviri nani kwe etch factor.

2.2 Kufunga Nezvekugadzira Magadzirirwo Emapaya Akasiyana

Mapairi eDifferential anonzwa kaviri kana paine etch variation nekuti zvese trace width uye gap spacing zvinoshanduka panguva imwe chete. Etch undercut inodzikisa trace yega yega uku ichipamhidza gap — zvinova zvinokanganisa differential impedance. Kune 100Ω differential pair:

• Kuchekwa kwechikamu che 0.01 mm padivi rega rega → zvisaririra zvakatetepa ne 0.02 mm, mukaha unowedzera ne 0.02 mm → musiyano weimpedance unowedzera neanenge 3–5Ω
• Nzira yekudzivisa dhizaini: tsanangura mukaha wakamanikana zvishoma pane chinangwa chekufananidzira kuti utsigire kuwedzera kwe etch. Ruzivo rwe etch factor rwemugadziri wako runogonesa kubhadharwa kwakanyatsojeka.

2.3 Kudzivisa Kuchinjana kweGlass Weave Dk (Zvinhu Zvakarukwa Chete)

Pazvinhu zvakarukwa negirazi rekusimbisa (FR4, Megtron 6, mamwe magiredhi eIsola), dhayamita yeDk inosiyana nguva nenguva pakati penzvimbo dzine girazi rakawanda nedzine resin yakawanda. Kana dhayamita yakamanikana ikabatana negirazi rekurukwa, impedance inochinja-chinja zvichienderana nehurefu hwedhayamita. Nzira dzekuderedza:

• Tenderedza bhodhi 5–10° zvichienderana negwara regirazi repaneru (chikumbiro kubva kumugadziri)
• Shandisa spread-glass prepreg (semuenzaniso, Megtron 6 neNE-glass spread treatment) iyo inoita kuti Drk iite homogeneous
• Pazvinhu zvisina kurukwa (PTFE yepurasitiki ine ngura shoma, zvinhu zvakazadzwa neceramic), izvi hazvipo — imwe mukana wekusarudza purasitiki ine ngura shoma pane dzimwe nzira dzemagirazi dzakarukwa.

3) Kuburikidza neDhizaini yeHF Signal Transitions: Stubs, Anti-Pads, uye Ground Fencing

3.1 Zvinodiwa neStub Resonance neBack-Drill

Mugero weburi riri pabhodhi rine zvidimbu zvakawanda unogadzira stub — chikamu chebhareri chisina kushandiswa chiri pasi (kana pamusoro) pechiratidzo chechinangwa. Stub inoshanda semutsetse wekutumira wepfupi unotenderera nefrequency yakatarwa nehurefu hwayo:

• f_resonance ≈ c / (4 × stub_length × √Dk_inoshanda)
• Muenzaniso: 1.2 mm stub mu hydrocarbon-ceramic low-loss laminate (Dk ≈ 3.5) → resonance pa ~33 GHz

Kana frequency yako yekushandisa yasvika pa stub resonance, kurasikirwa kwekudzoka kunoderera zvakanyanya (>10 dB notch). Mutemo wepamusoro: kana kureba kwe stub kuri > λ/10 pafrequency yako yekushandisa, zvinokurudzirwa kuti uise back-drilling.

Zvinorehwa nedhizaini: tsanangura kushivirira kwemugadziri pakuboorera shure (kazhinji ± 0.1 mm) mukuenzanisa kwako. Chidimbu chakasara che 0.1–0.15 mm mushure mekuboorera shure chichiri neRF impact pamusoro pe40 GHz.

3.2 Kusakura kwePad

Mapadhi ekudzivirira (maburi ekubvisa maburi ari muzvikamu zvinotenderera kuburikidza nemapadhi) anokanganisa impedance pakuchinja kwenzira. Mapadhi makuru ekudzivirira anowedzera kudzikiswa kwesimba re discontinuity asi haafanire kukanganisa clearance yekuboorera kubva pa drill kuenda ku copper. Gadzira mapadhi ekudzivirira zvichibva pakutsungirira kwekuboorera kwemugadziri (kazhinji ± 0.05 mm) pamwe nemuganhu we clearance (0.10 mm), kwete kubva pa generic DFM default values.

3.3 Kudzivirira Kushandiswa Kwefenzi Nepasi Kuti Kudzivise Kushandiswa Kwemodhi

Masaini ezviratidzo ari mu stripline kana CPW structures anoda masaini epasi akakomberedza kuti adzivise ma parallel plate modes. Nzvimbo yepamusoro yepasi kuburikidza ne spacing haifanirwe kudarika λ/10 pa frequency yepamusoro yekushanda. Pa 28 GHz muDk = 3.5 material, izvi zvinoreva kuti pasi kuburikidza ne spacing ≤ 0.57 mm. Shanda nemugadziri kuti uone kuti nzvimbo iyi inogoneka zvichienderana nekururama kwavo pakunyoresa drill uye clearance shoma ye via-to-via.

4) Dhizaini yeKutarisira Kupisa Inodziviswa neHF Substrate Properties

4.1 Kufambiswa kweHF Zvinhu Zvinopisa

Zvigadziko zveHF zvine conductivity yakaderera zvakanyanya yekupisa kupfuura simbi kana kunyange zvigadziko zveceramic:

• laminate ine hydrocarbon-ceramic yakaderera-kurasikirwa: 0.62 W/m·K
• laminate ine PTFE yakaderera-kurasikirwa: 0.20 W/m·K
• FR4: 0.30 W/m·K
• Aruminiyamu (yekuenzanisa): 205 W/m·K

Kune maRF amplifiers ane simba guru (GaN PAs, GaAs MMICs), substrate iyi ine dambudziko rekupisa. Thermal via arrays pasi pemudziyo inopa nzira huru yekufambisa nepakati pe substrate kuenda ku internal copper plane kana exposed bottom pad.

4.2 Kudzivirira Kupisa paPTFE

Kugadzirwa kwekupisa kuburikidza nekugadzirwa kwePTFE substrates kwakaoma kupfuura paFR4:

• Muganho wechikamu: PTFE kuburikidza neplating yakavimbika kusvika pachiyero che8:1 (kudzika:dhayamita) neplasma desmear. Bhodhi re1.6 mm rinoda dhayamita inosvika 0.2 mm.
• Kupinda-ku ... Ma "thermal via arrays" anowanzo shandisa "pitch" ye0.6–1.0 mm. Pasi pe "pitch" ye0.5 mm, kukanganisa kwe "drill registration error" kunogona kukanganisa "via-to-via shorting".
• Yakazadzwa kana isina kuzadzwa: Ma-vias akazadzwa nemhangura anopa simba riri nani pakupisa kupfuura ma-vias akaputirwa asi anowedzera mutengo. Simbisa nemugadziri kana ma-vias akazadzwa nemhangura aripo pa-HF substrate yako.

4.3 Kuenzanisa Mhangura Kwekudzora Warpage

Kupararira kwemhangura kusingaenzaniswi kunokonzera kupwanyika kwebhodhi panguva yekutsvedza uye kuyererazve. Mabhodhi eHF anonyanya kupwanyika nekuti laminate yakasarudzika ine kurasikirwa kwakaderera uye FR4 layers dzine CTE dzakasiyana - bhodhi rinoda kukotama zvakasiyana kudivi rega rega. Maitiro ekugadzirisa:

• Gadzirisa nzvimbo yemhangura pamusoro nepazasi mukati me15%
• Wedzera kuba kwemhangura (kuzadza mhangura kwemhando yepamusoro) pamatanda ane nzvimbo shoma yemhangura
• Iva nechokwadi chekuti zvikamu zvemukati zvakavakwa zvakaenzana (chinhu chimwe chete uye huremu hwemhangura pamusoro nepasi pemutsetse wepakati)

Mugadziri anogona kuongorora huwandu hwemhangura yako uye kukurudzira maitiro chaiwo ekuba panguva yekuongorora DFM.

5) Bhodhi, Panelization, uye Singulation: RF Impact yeMagadzirirwo eMichina

5.1 Kubvisa Trace-to-Edge paPTFE

PTFE nemidziyo yakazadzwa neceramic inopfava kupfuura FR4. Munguva yekuumbwa kwebhodhi (routing kana V-scoring), kupwanya kwemucheto kunowedzera kukwira mubhodhi. Kana trace yakakosha ye impedance ichifamba pedyo nemupendero webhodhi, kupwanya kunogona kukuvadza trace kana kushandura muganhu we dielectric, zvichichinja impedance.

Zvinokurudzirwa zvishoma zvekubvisa tsvina kubva paganda kusvika pamucheto:

• FR4: 0.25 mm (yakajairika)
• laminate ine hydrocarbon-ceramic ine low-loss / laminate ine hydrocarbon-ceramic ine low-loss: 0.50 mm
• laminate / PTFE yakachena ine PTFE yakaderera-kurasikirwa: 0.75 mm

5.2 V-Score vs. Tab Routing

Kuisa maV-scoring kunoita kuti pave nemugero uri pamuganhu webhodhi unobvumira kupatsanurwa kwema snap mushure mekuungana. Kuisa maTab routing kunoshandisa nzvimbo dzakarongwa dzine ma breakaway tabs. Kune maHF boards:

• V-score yakakodzera kana mupendero webhodhi usina maRF traces uye substrate isiri PTFE chaiyo (V-scoring paPTFE inogona kukonzera delamination).
• Kuronga maTab Zvinodiwa kana mipendero yebhodhi iine zvinhu zveantenna kana mitsetse yekutumira, kana kana substrate iri yakavakirwa paPTFE. Nzvimbo yetabhu inofanira kudzivirira nzvimbo dzinonzwa RF.

5.3 Kuenzana kwePanelization uye Impedance

Mabhodhi ari pamucheto wepaneru ane mwero we etch wakasiyana zvishoma uye kumanikidzwa kwe lamination pane mabhodhi ari pakati pepaneru. Kune mabhodhi eHF anoshivirira zvakanyanya, mugadziri anofanira kuisa makuponi e impedance panzvimbo dzese dziri kumucheto nepakati kuti aone kuti akafanana papaneru yese. Kugadziriswa kwenzvimbo dzepaneru kunofanirwa kufunga nezvekufanana kwe impedance - kwete kungoverengerwa kwebhodhi papaneru chete.

6) Nzira yeRF-Area Solder Mask: Bare Copper, Selective Mask, kana Full Coverage

6.1 Sarudzo nhatu uye RF dzadzo dzinosiyana

Kune akawanda magadzirirwo eHF anopfuura 6 GHz, chifukidzo chesolder chakasarudzwa ndiyo nzira yakajairika. Tsanangura nzvimbo dzekusabvisa chifukidzo chesolder mumafaira ako eGerber dzinofukidza mitsetse yese yeRF transmission, antenna elements, uye RF pads dzine clearance inosvika 0.1 mm kutenderedza mipendero yetrace.

7) Matsigiro Anoita Highleap Kurongeka Kwekugadzira HF PCB

Highleap Electronics inopa nzira yekubatanidza dhizaini nekugadzira zvinhu yakatsanangurwa muchinyorwa chino:

• Data rekugadzirisa rekushandisa kuenzanisa: Yakayerwa Dr/Df, zvinhu zvinoumba, copper roughness (Rz), uye data rehukobvu hwe dielectric rakapihwa kumapoka ekugadzira kuti vagadzire impedance chaiyo uye loss modeling.
• Kugona kuchera musana: Kushivirira kudzika kwe±0.1 mm, kwakasimbiswa nechikamu chakasiyana pane yega yega nzvimbo yekugadzira
• HF-yakanangana neDFM: Kuburikidza nekuongorora stub, anti-pad optimization, ground via density verification, solder mask exclusion zone review, uye pamusoro pedza kurudziro yekushanda kweRF
• Stackup co-dhizaini: Kugadzira ma "stackup" pamwe chete uchishandisa field solver ine zvinhu zvakagadziriswa kuti zviitwe, zviripo usati watanga kuronga
• Kugadzira mifananidzo yakabatanidzwa: Kukurumidza prototyping ine impedance yakazara uye insertion loss report yekusimbisa simulation-to-fabrication correlation
• Kurongeka kwemusangano: Pa-saiti SMT musangano ne HF-substrate-specific reflow profiles, zvichibvisa kubata kwenzvimbo dzakasiyana dzeRF traces dzakaratidzwa

Tanga Ongororo Yako yeHF Design