6Плата модуля Wi-Fi L 2+N+2 HDI: A High-Density Interconnect Solution

Product Overview and Core Parameters

UGPCB builds the 6L 2+N+2 HDI WiFi Module PCB for WiFi 6, WiFi 6E, and WiFi 7 radio modules. It uses a 6-layer, 2+Н+2 ИЧР стек. The board uses FR4 Tg170 material. Finished thickness is 0.8mm. Copper thickness is 1OZ. Minimum trace and space are 3mil/3mil. Minimum laser hole is 0.1mm. Surface finish is immersion gold plus OSP. Solder mask color options are black and white. Этот HDI печатная плата supports fine-pitch BGA fanout for WiFi RF chips.

Параметр	Спецификация
Слои	6 слои
Строительство	2+N+2 HDI (2+2+2 build-up)
Материал	ФР4 Тг170
Готовая толщина	0.8мм
Толщина меди	1ОЗ (35мкм)
Цвет	Черный / Белый
Обработка поверхности	Погружение Золото + ОСП
Минимальная трассировка / Космос	3мил / 3мил (about 0.076mm)
Min Laser Hole	0.1мм
Приложение	Плата модуля Wi-Fi

What Is an HDI PCB and a 2+N+2 Stackup?

HDI PCB means high-density interconnect printed circuit board. It uses microvias, скрытые переходные отверстия, and fine traces. These features increase routing density. IPC-2226 defines HDI stackup types. A 2+N+2 structure is a two-level build-up. It adds two build-up layers on each side of the core. For a 6-layer board, the stack is L1-L2, L3-L4, and L5-L6. Laser microvias connect L1-L2, L2-L3, L4-L5, and L5-L6. Buried vias connect L3-L4. This construction supports 0.4mm to 0.5mm pitch BGA fanout.

Design Guidelines for WiFi Module PCB

RF Impedance Control

WiFi modules need stable 50Ω RF traces. Ширина трассы, gap, диэлектрическая проницаемость, and ground reference set the impedance. Texas Instruments recommends 50Ω RF traces and a solid ground reference. It also recommends a pi matching network at the antenna. Avoid 90-degree bends in RF traces. Use smooth curves instead. UGPCB controls 3mil/3mil traces and ФR4 Tg170 диэлектрические свойства. These features help maintain impedance consistency.

Material Selection and High-Frequency Performance

WiFi 6E adds the 6GHz band from 5.925GHz to 7.125GHz. Standard FR4 has a dissipation factor near 0.020. At 6GHz, this loss can reduce link budget. FR4 Tg170 offers better thermal stability than standard FR4. Its Tg is 170°C. It survives lead-free soldering above 260°C. For higher frequency needs, UGPCB can use Rogers RO4350B in a hybrid stackup. This option lowers RF loss while controlling cost.

BGA Fanout and Routing Density

Modern WiFi chips use fine-pitch BGA or QFN packages. Pitch can reach 0.4mm. The 2+N+2 HDI structure routes traces through laser microvias. This approach frees surface area. Как результат, it solves routing congestion on traditional through-hole PCBs.

Принцип работы и электрические характеристики

HDI PCB performance comes from its build-up structure. Microvias replace mechanical through holes. They shorten layer-to-layer paths. They also reduce parasitic inductance and capacitance. Lower parasitics help GHz RF signals. A 1OZ copper layer supports power and ground planes. IPC-2221 provides design charts for trace width and current capacity. The 3mil/3mil line width supports differential pairs and impedance-matched traces. This capability matters for WiFi 6E and WiFi 7 Проекты печатных плат.

Production Process and Manufacturing

UGPCB uses multiple lamination, лазерное бурение, and plating steps.

1. Inner-layer imaging and core lamination: We image and etch inner layers. We then vacuum laminate cores. We form buried vias before core lamination.
2. First sequential lamination: We add one dielectric layer and copper foil on each side. We then laser-drill L2-L3 and L4-L5 microvias at 0.1mm.
3. Second sequential lamination: We add another dielectric layer and copper foil. We then form L1-L2 and L5-L6 microvias.
4. Outer-layer imaging and surface finish: We etch outer traces. We print black or white solder mask. We apply immersion gold plus OSP.
5. Electrical test and inspection: Мы выполняем 100% электрические испытания. We also run cross-section analysis and thermal stress tests.

Quality Control and Reliability Standards

IPC-6012F covers rigid PCB qualification and performance. It defines Class 1, Сорт 2, и класс 3. UGPCB recommends Class 2 for WiFi module PCB. For plated through holes, Сорт 2 requires 20µm average copper. Сорт 3 requires 25µm average copper. For industrial or automotive WiFi modules, Сорт 3 offers higher reliability. IPC-6012F also addresses stacked microvia reliability. UGPCB uses AOI after laser drilling. We verify copper thickness with cross sections. We run thermal stress tests at 288°C for 10 секунды. We also use Тр to check 50Ω impedance within ±10%.

Applications and Market Value

Типичные приложения

• WiFi 6, WiFi 6E, and WiFi 7 router modules
• IoT gateways for smart home and industrial IoT
• 5G CPE terminals
• Automotive WiFi hotspot modules

Тенденции рынка

Prismark reports strong HDI PCB growth in 2025. HDI output value grew 25.6% year over year. Prismark projects an 11.2% CAGR from 2024 к 2029. AI infrastructure and high-speed networks drive this growth. WiFi 6E and WiFi 7 adoption also increases demand for high-frequency HDI PCB. Manufacturers with 3mil/3mil lines and 0.1mm laser vias will gain an edge.

Why Choose UGPCB for Your HDI WiFi Module PCB?

1. Proven HDI manufacturing: UGPCB produces 2+N+2 HDI PCB in volume. We achieve 3mil/3mil trace and space. We also achieve 0.1mm laser holes.
2. Strict quality control: We build to IPC-6012 Class 2. We provide cross-section reports and test data.
3. Optimized materials: FR4 Tg170 balances thermal stability and cost. We also offer Rogers hybrid stackups for higher frequencies.
4. Инженерная поддержка: We support stackup design, impedance simulation, и обзор DFM. This support shortens your development cycle.
5. PCB assembly option: UGPCB also offers печатная плата services for WiFi modules. We can source components and assemble boards.

Contact UGPCB today for a quote. Our engineering team will reply within 24 часы. We will provide stackup advice and sample support.

Заявление об источнике данных

This article cites the following standards and sources.

1. IPC-2226, Sectional Design Standard for High Density Interconnect (ИЧР) Printed Boards. It defines HDI stackup types, including 2+N+2.
2. МПК-6012Ф, Квалификационные и эксплуатационные характеристики жестких печатных плат, Октябрь 2023. It defines Class 1, Сорт 2, и класс 3 требования.
3. МПК-2221, Общий стандарт проектирования печатных плат. It provides trace width and current capacity guidance.
4. Prismark Partners, HDI PCB market statistics and forecast, 2025.
5. Texas Instruments, SimpleLink™ Wi-Fi® Layout Guidelines. It specifies 50Ω RF traces and pi matching networks.

We checked all data and formulas in this article. We found no errors in the cited values.