Precision High-Frequency PCB Manufacturing & Assembly Service

We strategically place low Df laminates on critical layers and combine them with

economical high-Tg cores, drastically lowering the BOM cost for your low-to-mid volume run.

High-Frequency & High-Speed PCB

Consult our Application Engineers (AEs) today to design an optimized stack-up that balances Dk stability and budget for your 5G small cell prototype.

What is a High-frequency (HF) PCB?

High frequency PCB optimized for RF, microwave and mmWave circuits where low loss and stable impedance are critical.

Qualification Materials & Compliance Overview
The Advantage of High-frequency Printed Circuit Board

Qualification Materials & Compliance Overview

Acceptance Standards

Qualified to IPC-6012 / IPC-6018 (where applicable) with RF-specific tests for impedance and loss.

High Frequency PCB Material Standards

PTFE, hydrocarbon-ceramic or other low-Dk / low-Df laminates, sometimes in hybrid stacks with FR-4; material grades traceable.

Structure

Controlled-impedance stack-up with RF layers, carefully designed reference planes and via structures to minimise discontinuities.

Compliance

Supports RoHS / REACH, UL where required, and telecom/industrial standards for temperature, humidity and reliability.

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The Advantage of High-frequency Printed Circuit Board

Stable RF behaviour when low-loss materials and lamination are correctly handled.

01 controlled Dk/Df over temperature avoids long-term drift.
02 careful drilling and bonding prevent cracks in hybrid RF stacks；
03 supports consistent RF performance over product lifetime.

Premium material and process, justified when RF performance drives product value.

01 PTFE / low-loss laminates are significantly more expensive than FR-4;
02 tight impedance and thickness control add manufacturing cost.
03 typically used only where link budget, range or RF margin cannot be met on standard materials.

Optimized for RF, microwave and mmWave signal integrity.

01 low insertion loss improves efficiency of RF chains;
02 precise impedance and phase control support filters, LNAs, PAs and antennas;
03 irectly contributes to better link budget, range and sensitivity.

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Quick-turn High-Frequency PCBs for

Sub-6 GHz and mm Wave applications

High-Frequency PCB fabrication demands extreme precision.

We utilize LDI for fine-line definition and Plasma Desmear for clean via barrels. Critical steps include specialized RF Material Cutting to manage Dk stability, finalized by rigorous TDR Testing to verify impedance control and signal integrity.

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01High-Frequency PCB Material Properties Reference
02High-Frequency PCB (RF / Microwave / mmWave) Layer/Complexity Mapping

Category	Parameter	Dissipation Factor (Df @10 GHz)	Frequency Range	Tg (°C)	TCDk (ppm/°C)	Thermal Conductivity (W/m·K)	Standard Thickness (mm)	Typical Applications
RF / Microwave	General low-loss laminates	0.0037	Up to ~10 GHz (RF / Microwave)	>280	~50	0.62	0.10–3.20	5G antennas, RF front-end modules, radar
RF Circuits	Low-loss RF circuits	0.0027	1–8 GHz RF circuits	>280	~40	0.71	0.10–2.00	IoT wireless modules, WLAN, L-band microwave
mmWave	Ultra-low loss for 77 GHz class	0.0013	Up to 77 GHz (mmWave)	>280	~13	0.5	0.13–2.00	Automotive 77 GHz radar, 5G mmWave phased arrays
High-Dk	Microwave miniaturization	0.0027	High-Dk microwave miniaturization	>280	Typical	Varies	Varies	Compact microwave antennas & filters
RF / Microwave	Wideband RF materials	0.0022	1–30 GHz RF / Microwave	>280	~23	0.64	0.25–2.00	High-Dk couplers, resonators, amplifiers
High-Reliability	High-reliability RF laminates	0.0037	Up to ~10 GHz (High-reliability)	>280	~50	0.69	0.10–3.20	Aerospace & high-reliability RF modules
PTFE-based	Cost-effective broadband RF	0.0018–0.0030	1–40 GHz RF & microwave	~280 (PTFE-based)	~50	0.25	0.13–3.20	Cost-effective RF boards, antennas, broadband circuits
mmWave	Very low loss for 110 GHz class	0.0009	Up to 110 GHz (mmWave)	>280	<50	~0.20	0.127–3.175	mmWave radar, satellite communication, broadband RF
High-Dk	High-Dk microwave circuits	0.0027	Up to ~40 GHz	>280	~50	~0.24	Varies	High-Dk microwave circuits
Ultra-compact RF	Filters & resonators	0.0023	1–40 GHz	>280	~50	~0.24	Varies	Ultra-compact RF filters & resonators
Thermal Optimized	High-power RF / microwave	Low (thermal optimized)	High-power RF / microwave	>280	—	Enhanced thermal conductivity	Varies	RF power amplifiers, phased-array transmit modules
Thermal Substrates	High-frequency + high power	0.0003–0.0005	High-frequency + high power	—	Very stable	20–30	0.25–2.0	High-power microwave modules, LED thermal substrates
High-Heat Load	High-frequency + high heat load	~0.0003	High-frequency + high heat load	—	Very stable	150–200	0.25–2.0	Radar TR modules, satellite payloads, mmWave PA

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Category	Parameter	STANDARD (Sub-6G / ISM / WiFi / Entry RF)	ADVANCED (Microwave 6–18 GHz / Mid-band 5G)	MICRO (mmWave 18–40+ GHz / Radar / Antenna Array)	Classification Logic	Typical Use Case
RF Band	Target Frequency Band	<6 GHz (Sub-6G, ISM, WiFi 2.4/5G)	6–18 GHz (C/X/Ku, Mid-band 5G, Microwave Links)	18–40+ GHz (Ka, mmWave, Radar, Phased Array)	RF Band / Application	Quick band-based selection for engineers & buyers
System Use	Application Scenario	Wireless modules, routers, small cells, high-speed mixed-signal	5G AAU, microwave front-end, radar front-end	mmWave radar, Ka-band terminals, precision phased arrays	Band / System Use	Sales & procurement tier by end-application
Stack-up	Layer Count	2–6 layers, simple mixed-signal	4–10 layers, high-speed + RF hybrid	8–16+ layers, complex RF + digital + power isolation	Stack-up Complexity	Engineer stack-up & cost assessment
Stack-up / Layout	Typical RF Structure	Single/dual microstrip + simple planes	Multi-plane w/ Microstrip + Stripline mix	Multi-plane w/ multi-stripline + shielding layers	Stack-up / Layout	RF designer’s stack-up planning
Material Options	Base Material	High-Tg FR-4 / Low-loss FR-4 / Mixed laminate	Rogers 4000 / Isola I-Tera / Panasonic Megtron (hybrid stack-ups)	PTFE / LCP / Advanced RF materials (Rogers 3000/6000 series)	Material / Process	RF material selection for SI & loss
Material	Typical Dk (10 GHz)	~3.5–4.2	~3.0–3.7	~2.2–3.0	Material / Process	Impedance & phase design
Material	Df @ 10 GHz	~0.008–0.015	~0.003–0.008	≤0.003	Material / Process	HF/microwave loss budgeting
Material	Copper Type	Standard ED (standard roughness)	Low-roughness ED / Half-gloss copper	Ultra-low-roughness ED / RA / VLP copper	Material / Process	Control insertion loss & reflection
Surface Finish	—	HASL / OSP / ENIG	ENIG / ENEPIG	ENIG / ENEPIG / Selective soft-gold for RF ports	Material / Process	RF connectors / SMA pad reliability
Impedance Control	Impedance Tolerance	±10%	±7–10%	±5% or tighter	Functional / SI	RF-SI design requirements
Insertion Loss	Insertion Loss Target (relative)	Baseline IL control	Optimized IL for 6–18 GHz	Ultra-low IL for mmWave / long RF chains	Functional / SI	Link budget / range / sensitivity
Electrical Testing	Test Method	Flying probe + partial TDR	TDR + S-parameter checks on critical links	Full S-parameter validation (VNA) + 100% key-link sampling	Functional / Quality	Buyer verification of electrical reliability
Via Structure	Via Structure	Through-hole dominant, limited backdrill	Through-hole + blind/buried vias; routine backdrill for key SerDes	TH + blind/buried + Via-in-Pad; system-level backdrill	Layer / Structure	Minimize via stubs & improve return loss
Process	Via-in-Pad	Optional in BGA areas	Recommended for dense BGA & high-speed links	Mandatory for mmWave ICs, RF BGAs, front-end chips	Process / Layout	Packaging & placement capability indicator
SI Optimization	Backdrilling Usage	Limited high-speed interfaces	Routine on differential SerDes links	Extensive multi-stage backdrilling	Functional / SI	Improve eye diagram & reduce stub resonance
Routing	Min. Trace / Space	0.10 mm (4 mil)	0.075 mm (3 mil)	0.05 mm (2 mil) or below	Material / Process	High-density RF routing
Stack-up	Board Thickness	0.6–1.6 mm	0.6–2.0 mm	0.8–2.4 mm (multi-plane / shielding capable)	Stack-up	Impedance, connector fit, mechanics
Dielectric Control	Dielectric Thickness Control	Standard FR-4 tolerance	Optimized dielectric thickness (impedance-oriented)	Precision dielectric thickness (phase / delay critical)	Material / Process	Phase match & differential delay
Reliability	Operating Temperature	0–85 °C	–20 to 105 °C	–40 to 125 °C or above	Functional / Reliability	Telecom / automotive / industrial
Reliability Standard	Reliability Class	IPC-6012 Class 2	IPC-6012 Class 2/3	IPC-6012 Class 3 / telecom & automotive grade	Functional / Quality	Buyer/engineer quality alignment
Tier	Service Tier	High-Frequency PCB STANDARD	High-Frequency PCB ADVANCED	High-Frequency PCB MICRO/mmWave	Tier / Capability	Procurement tier by project value
Schedule	Standard Lead Time	7–10 days	10–15 days	8–18+ days (freq/material dependent)	Schedule	RF prototype / pilot planning
RF Layout	RF Structure Optimization	Basic RF widths/spacings + simple impedance ctrl	Added reference grounds, impedance via arrays, simple coupling structures	Full RF layout rules: via fences, moat grounds, phase matching	Functional / SI	RF layout & SI co-design
EMC / Isolation	Shielding & Isolation	Copper pour + simple ground split	Local shielding areas + stitched grounds	Multi-zone shielding + metal-can interface provisions	Functional / EMC/EMI	Reduce crosstalk, improve RF/EMC

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FAQs

What questions matter most in high-frequency and high-speed PCB design?

From controlled impedance stackup, low-loss laminate selection, and DDR/PCIe routing rules to mass-production tolerances, testing methods, and storage conditions, these FAQs help engineers optimize cost, lead time, and signal integrity with factory-level guidance.

For deeper technical discussions, feel free to reach out to KnownPCB.

Precision High-Frequency PCB Manufacturing & Assembly Service

What is a High-frequency (HF) PCB?