{"id":2348,"date":"2026-10-13T11:00:00","date_gmt":"2026-10-13T03:00:00","guid":{"rendered":"https:\/\/www.jingpengpcb.com\/?p=2348"},"modified":"2026-10-08T20:14:34","modified_gmt":"2026-10-08T12:14:34","slug":"hf-pcb-material-and-process","status":"publish","type":"post","link":"https:\/\/www.jingpengpcb.com\/en\/blog\/hf-pcb-material-and-process\/","title":{"rendered":"How to Choose High-Frequency PCB Materials? Key Considerations for Processing PTFE and Ceramic-Filled Materials"},"content":{"rendered":"<style>\n.jp-tw{overflow-x:auto;margin:26px 0;-webkit-overflow-scrolling:touch;}\n.jp-tw table{border-collapse:collapse;width:100%;min-width:560px;font-size:15px;line-height:1.65;background:#fff;}\n.jp-tw th,.jp-tw td{border:1px solid #dde3ea;padding:11px 14px;text-align:left;vertical-align:top;}\n.jp-tw thead th{background:#eef2f7;color:#1b2733;font-weight:700;white-space:nowrap;border-bottom:2px solid #c9d3de;}\n.jp-tw tbody tr:nth-child(even){background:#fafbfc;}\n.jp-tw tbody tr:hover{background:#f1f5fa;}\n.jp-tw tbody td:first-child{font-weight:600;color:#1b2733;}\n@media(max-width:767px){.jp-tw table{font-size:14px;min-width:520px;}.jp-tw th,.jp-tw td{padding:9px 11px;}}\n<\/style>\n<p>With the rapid advancement of technology, applications in the microwave and millimeter-wave fields are constantly increasing, and the frequency requirements for electronic devices are gradually rising. At the forefront of this electronic field lies a key component: high-frequency PCBs, which support high-frequency and microwave circuits. This article will explore PCBs<a href=\"\/en\/high-frequency-pcb\/\">High-Frequency Circuit Boards<\/a>Its definition, applications, classifications, and related processes\u2014take a peek into the mysteries of microwaves in the world of electronics.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"500\" class=\"alignnone size-large wp-image-4942\" src=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/07\/High-Frequency-PCBs.jpg\" alt=\"High-Frequency Circuit Boards\" srcset=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/07\/High-Frequency-PCBs.jpg 1000w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/07\/High-Frequency-PCBs-300x150.jpg 300w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/07\/High-Frequency-PCBs-768x384.jpg 768w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/07\/High-Frequency-PCBs-400x200.jpg 400w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<h2>1. Definition of High-Frequency PCBs<\/h2>\n<p>High-frequency PCBs refer to specialized printed circuit boards used in high-frequency (frequencies greater than 300 MHz or wavelengths less than 1 meter) and microwave (frequencies greater than 3 GHz or wavelengths less than 0.1 meter) applications. They are manufactured using either certain processes from standard rigid PCB fabrication methods or specialized treatment methods on microwave-grade substrates. Generally speaking, high-frequency PCBs are defined as those operating at frequencies of 1 GHz or higher.<\/p>\n<p>With the rapid advancement of science and technology, an increasing number of devices operate in the microwave frequency band (above 1 GHz) and even the millimeter-wave range (above 30 GHz). This means that the operating frequencies of these devices are constantly rising, placing higher demands on the substrate materials and performance of printed circuit boards. High-frequency laminates must possess excellent electrical properties, outstanding chemical stability, and extremely low signal loss at high frequencies. Therefore, high-frequency laminates are becoming increasingly important.<\/p>\n<h2>2. Five Key Parameters of High-Frequency Sheets<\/h2>\n<p>Choosing a high-frequency board essentially comes down to selecting five parameters. These five parameters directly determine whether a signal can reach the other end:<\/p>\n<div class=\"jp-tw\">\n<table>\n<thead>\n<tr>\n<th>Parameters<\/th>\n<th>Symbol<\/th>\n<th>Physical Meaning<\/th>\n<th>Typical Range<\/th>\n<th>Impact<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Dielectric constant<\/td>\n<td>Dk \/ \u03b5r<\/td>\n<td>Multiplier for the speed of signal propagation in a medium<\/td>\n<td>2.2\u201310.2<\/td>\n<td>Determines line width and impedance; the more stable the Dk, the better.<\/td>\n<\/tr>\n<tr>\n<td>Tangent of the loss angle<\/td>\n<td>Df \/ tan\u03b4<\/td>\n<td>The rate at which a medium converts electrical energy into heat<\/td>\n<td>0.0009\u20130.020<\/td>\n<td>Insertion loss is the primary criterion for high-frequency component selection.<\/td>\n<\/tr>\n<tr>\n<td>Temperature Coefficient of the Dielectric Constant<\/td>\n<td>TCDk<\/td>\n<td>Dk Temperature Drift (ppm\/\u00b0C)<\/td>\n<td>\u2212200 to +200<\/td>\n<td>Factors Affecting Temperature Stability in Outdoor and In-Vehicle Environments<\/td>\n<\/tr>\n<tr>\n<td>Water Absorption Rate<\/td>\n<td>\u2014<\/td>\n<td>Weight Gain Ratio After 24-Hour Soaking<\/td>\n<td>0.02%\u20130.30%<\/td>\n<td>Water absorption increases both Dk and Df simultaneously.<\/td>\n<\/tr>\n<tr>\n<td>Copper Foil Roughness<\/td>\n<td>Rz<\/td>\n<td>Microscopic Irregularities on the Copper Surface<\/td>\n<td>0.3\u20135 \u03bcm<\/td>\n<td>Under the skin effect, surface roughness directly increases conductor losses.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>An often-overlooked conclusion:<strong>At frequencies above 10 GHz, conductor loss (determined by the roughness of the copper foil) often exceeds dielectric loss.<\/strong>. Many engineers focus solely on selecting boards based on their Df value, but end up using boards with extremely low Df values without reducing power loss\u2014because the bottleneck is the copper foil. High-frequency boards must be used in conjunction with<strong>Low-Profile Copper Foil (VLP\/RTF\/HVLP)<\/strong>, When Rz is reduced from 5 \u03bcm to 1 \u03bcm, the insertion loss at 10 GHz improves by 15\u2013251 TP3T.<\/p>\n<h2>3. Application Areas of High-Frequency PCBs<\/h2>\n<p>High-frequency PCBs play a critical role in many fields; some of their primary applications include:<\/p>\n<ul>\n<li>Mobile communication products: such as 5G devices and satellite communication systems.<\/li>\n<li>Power amplifiers, low-noise amplifiers, etc.: Used for signal amplification and processing.<\/li>\n<li>Passive components: such as power dividers, couplers, duplexers, filters, etc.<\/li>\n<li>Automotive Collision Avoidance Systems: These are implemented in high-frequency radar systems found in modern automobiles.<\/li>\n<li>Satellite systems: Used for data transmission and communications.<\/li>\n<li>The Shift Toward Higher Frequencies in Electronic Devices: Electronic devices are trending toward higher frequencies, which is a future development trend.<\/li>\n<\/ul>\n<p>These applications can be further categorized by frequency band, and the panel designs vary significantly across different frequency bands:<\/p>\n<ul>\n<li><strong>1\u20136 GHz<\/strong>(Sub-6G base stations, Wi-Fi 6E, and radar systems operating at frequencies other than 77 GHz for automotive applications): High-Tg FR-4 is still marginally usable, but the industry has largely shifted to ceramic-filled thermosetting materials.<\/li>\n<li><strong>6\u201330 GHz<\/strong>(5G millimeter-wave front-end, satellite communications, point-to-point microwave): PTFE or a low-loss ceramic filling system must be used, with a Df requirement of \u22640.004.<\/li>\n<li><strong>30 GHz and above<\/strong>(77\/79 GHz automotive radar, E-band backhaul): These applications are extremely sensitive to Dk tolerance and copper foil roughness; materials with the best Dk stability, such as the RO3000 series, are commonly used.<\/li>\n<\/ul>\n<h2>4. Classification of High-Frequency PCBs<\/h2>\n<p>High-frequency PCBs can be divided into two main categories based on the materials used:<\/p>\n<h3>4.1 Thermosetting Materials Filled with Ceramic Powders<\/h3>\n<ul>\n<li><strong>Manufacturer<\/strong>: Rogers' 4350B\/4003C, Arlon's 25N\/25FR, Taconic's TLG series, etc.<\/li>\n<li><strong>Processing Methods<\/strong>: Similar to standard FR4 circuit boards, but the material is more brittle, so care must be taken to prevent board breakage and to avoid reducing the service life during drilling and routing.<\/li>\n<\/ul>\n<h3>4.2 PTFE (Polytetrafluoroethylene) Material<\/h3>\n<ul>\n<li><strong>Manufacturer<\/strong>: Rogers' RO3000 Series, RT Series, and TMM Series; Arlon's AD\/AR Series, IsoClad Series, and CuClad Series; Taconic's RF Series, TLX Series, and TLY Series; and Taixing Microwave's F4B, F4BM, F4BK, TP-2, etc.<\/li>\n<li><strong>Processing Methods<\/strong>: This includes multiple steps such as material cutting, drilling, hole finishing, copper plating, board electroplating, dry film, inspection, pattern electroplating, etching, etch inspection, solder mask application, character marking, tin spraying, forming, testing, final inspection, packaging, and shipping.<\/li>\n<\/ul>\n<h2>5. Comparison of Parameters for Major Grades<\/h2>\n<p>If you arrange the common grades by Dk and Df, it becomes very clear which one to choose:<\/p>\n<div class=\"jp-tw\">\n<table>\n<thead>\n<tr>\n<th>Grade<\/th>\n<th>System<\/th>\n<th>Dk @ 10 GHz<\/th>\n<th>Df @ 10 GHz<\/th>\n<th>Machinability<\/th>\n<th>Relative Cost<\/th>\n<th>Typical Scenarios<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>High Tg FR-4<\/td>\n<td>Epoxy-Reinforced Glass Fiber<\/td>\n<td>4.2\u20134.6<\/td>\n<td>0.015\u20130.020<\/td>\n<td>Excellent<\/td>\n<td>1\u00d7<\/td>\n<td>Digital Circuits, Low-Frequency Analog<\/td>\n<\/tr>\n<tr>\n<td>Rogers RO4350B<\/td>\n<td>Ceramic-Filled Thermoset<\/td>\n<td>3.48<\/td>\n<td>0.0037<\/td>\n<td>Similar to FR-4<\/td>\n<td>6\u20138\u00d7<\/td>\n<td>Base Station Power Amplifiers, Vehicle-Mounted Radar<\/td>\n<\/tr>\n<tr>\n<td>Rogers RO4003C<\/td>\n<td>Ceramic-Filled Thermoset<\/td>\n<td>3.38<\/td>\n<td>0.0027<\/td>\n<td>Similar to FR-4<\/td>\n<td>6\u20138\u00d7<\/td>\n<td>Antenna Feed Network<\/td>\n<\/tr>\n<tr>\n<td>Taconic TLG \/ RF Series<\/td>\n<td>Ceramic Filler \/ PTFE<\/td>\n<td>2.5\u201310.2<\/td>\n<td>0.0015\u20130.0035<\/td>\n<td>Intermediate<\/td>\n<td>7\u201312\u00d7<\/td>\n<td>Filters, Couplers<\/td>\n<\/tr>\n<tr>\n<td>Rogers RO3003<\/td>\n<td>PTFE + Ceramic<\/td>\n<td>3.00<\/td>\n<td>0.0010<\/td>\n<td>Requires treatment with sodium naphthalene<\/td>\n<td>12\u201318\u00d7<\/td>\n<td>77 GHz Radar, Millimeter-Wave<\/td>\n<\/tr>\n<tr>\n<td>Rogers RT5880<\/td>\n<td>Pure PTFE<\/td>\n<td>2.20<\/td>\n<td>0.0009<\/td>\n<td>Most Difficult<\/td>\n<td>15\u201320\u00d7<\/td>\n<td>Satellite, Ultra-Low Loss Requirements<\/td>\n<\/tr>\n<tr>\n<td>Taixing Microwave F4B<\/td>\n<td>PTFE (Domestically Produced)<\/td>\n<td>2.2\u20133.5<\/td>\n<td>0.0010\u20130.0020<\/td>\n<td>Requires treatment with sodium naphthalene<\/td>\n<td>5\u20138\u00d7<\/td>\n<td>Cost-sensitive microwave components<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Domestically produced PTFE systems (F4B \/ F4BM \/ F4BK \/ TP-2) have shown significant improvement in Dk consistency in recent years. Priced at about half that of imported equivalents, they are suitable for cost-sensitive projects where the operating frequency does not exceed 20 GHz. However, in terms of Dk batch tolerance and TCDk, they still lag behind the RO3000 series; for millimeter-wave bands, it is recommended to continue using imported materials. For detailed selection guidance on the Rogers 4000 series, please refer to<a href=\"\/en\/blog\/rogers-4000\/\">Rogers 4000 Series Laminates<\/a>\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"360\" height=\"120\" class=\"alignnone size-large wp-image-9684\" src=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2024\/11\/rogers.jpg\" alt=\"\u7f57\u6770\u65af\u9ad8\u9891\u677f\u6750\" srcset=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2024\/11\/rogers.jpg 360w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2024\/11\/rogers-300x100.jpg 300w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/p>\n<h2>6. Differences in the Processing of Ceramic-Filled Materials and PTFE<\/h2>\n<p>The processing challenges for these two types of materials occur in completely different production steps:<\/p>\n<div class=\"jp-tw\">\n<table>\n<thead>\n<tr>\n<th>Process Steps<\/th>\n<th>Ceramic-Filled Thermosets<\/th>\n<th>PTFE System<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Cutting\/Drilling<\/td>\n<td>The material is brittle and prone to chipping, resulting in a 30\u201350% reduction in drill bit life. %<\/td>\n<td>The material is soft, so drilling tends to cause burrs and resin stringing.<\/td>\n<\/tr>\n<tr>\n<td>Hole Metallization<\/td>\n<td>Just remove the resin residue as usual.<\/td>\n<td><strong>Sodium naphthalene treatment or plasma activation is required.<\/strong>, otherwise the copper won't adhere to the hole walls<\/td>\n<\/tr>\n<tr>\n<td>Laminating<\/td>\n<td>Similar to FR-4, with good mixed-pressing compatibility<\/td>\n<td>Requires special adhesive patches; significant variations in the temperature profile<\/td>\n<\/tr>\n<tr>\n<td>Etching<\/td>\n<td>Close to normal<\/td>\n<td>Side erosion must be controlled; PTFE is a soft material that is prone to deformation.<\/td>\n<\/tr>\n<tr>\n<td>Solder Mask<\/td>\n<td>Adhesion is acceptable; surface preparation is required.<\/td>\n<td>Poor adhesion; requires special pretreatment or a different solder mask ink<\/td>\n<\/tr>\n<tr>\n<td>Forming<\/td>\n<td>The gouging tool wears out quickly<\/td>\n<td>Burrs are likely to form; the feed rate must be controlled.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Hybrid laminate structures (a high-frequency layer laminated together with an FR-4 layer) are a common method for reducing costs, but special attention must be paid to<strong>The coefficients of thermal expansion (CTE) of different materials must match the pressing temperature window.<\/strong>Otherwise, delamination or warping may occur. The mixed-press solution should undergo thermal stress testing (288 \u00b0C tin reflow) during the prototyping phase to verify its performance.<\/p>\n<h2>7. Challenges in the Process Flow<\/h2>\n<p>There are several technical challenges involved in manufacturing high-frequency PCBs, including:<\/p>\n<ol>\n<li>Electrolytic copper plating: Copper does not adhere easily to the inner walls of the holes.<\/li>\n<li>Control of photolithography, etching, line width variations, and pinholes.<\/li>\n<li>Green Ink Process: Pay attention to the adhesion of the green ink and prevent bubbling.<\/li>\n<li>Scratches on the board surface and other defects must be strictly controlled at each stage of the process.<\/li>\n<\/ol>\n<p>In the manufacturing process of high-frequency PCBs, expert craftsmanship and strict quality control are essential to ensuring the performance and reliability of the final product.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"500\" class=\"alignnone size-large wp-image-10315\" src=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2025\/04\/telecom_microwave-links.jpg\" alt=\"\u5fae\u6ce2\u4e2d\u7ee7\u5668PCB\" srcset=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2025\/04\/telecom_microwave-links.jpg 1000w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2025\/04\/telecom_microwave-links-300x150.jpg 300w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2025\/04\/telecom_microwave-links-768x384.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<h2>8. How to Overcome Each of the Four Challenges<\/h2>\n<h3>8.1 Electroless Copper Plating: Three Approaches to PTFE Hole Wall Activation<\/h3>\n<p>PTFE has an extremely low surface energy (approximately 18 mN\/m), and conventional chemical copper plating cannot be deposited on its surface. Industrially, there are three activation methods:<\/p>\n<ul>\n<li><strong>Sodium Naphthalene Etching<\/strong>: The most classic and effective method involves using a sodium-naphthalene complex to etch the PTFE surface, forming a carbonized layer. The drawbacks are that the treatment solution is flammable, requiring strict safety management, and that the cost of treating waste liquid is high.<\/li>\n<li><strong>Plasma Treatment (Plasma)<\/strong>: The surface is bombarded with plasma to alter its surface energy and microstructure. This method is environmentally friendly and highly controllable, but it does not provide as uniform a treatment for deep holes in thick plates as sodium naphthalene.<\/li>\n<li><strong>Specialized Chemical Activation Solution<\/strong>: An alternative that has emerged in recent years, offering a level of safety and uniformity that falls between the two; long-term reliability data should be confirmed with the chemical supplier.<\/li>\n<\/ul>\n<p>The criteria are very clear:<strong>After thermal stress testing (288 \u00b0C, 10 s, 3 cycles), the copper in the holes must not crack, and the copper thickness on the hole walls of the cross-section must be \u226520 \u03bcm.<\/strong>. If this is not achieved, it means the activation is incomplete.<\/p>\n<h3>8.2 Circuit Breaks and Sand Holes<\/h3>\n<p>High-frequency PCBs have much stricter requirements for line width accuracy than standard PCBs\u2014a 0.03 mm notch in a 0.15 mm microstrip line can cause impedance jumps and localized reflections. Key control points:<\/p>\n<ul>\n<li>Adopt<strong>Thin copper foil<\/strong>(12\u201318 \u03bcm) to reduce the effects of side erosion.<\/li>\n<li>Exposure Use<strong>LDI (Laser Direct Imaging)<\/strong>, to avoid film registration errors.<\/li>\n<li>Use after etching <strong>AOI 100% Inspection<\/strong>, with the detection threshold set to half that of a standard board.<\/li>\n<li>Line width compensation must be performed in accordance with<strong>Measured Etch Factor<\/strong>When performing a reverse calculation, you cannot apply the empirical values for FR-4.<\/li>\n<\/ul>\n<h3>8.3 Solder Mask Adhesion and Blistering<\/h3>\n<p>The inert nature of the PTFE surface results in poor adhesion of solder mask ink, which is prone to bubbling after reflow. The solution is<strong>Specialized pretreatment (plasma or chemical roughening) + compatible solder mask ink + segmented curing<\/strong>. Another point that is often overlooked:<strong>Solder mask can alter the effective Dk of a microstrip line<\/strong>. In the millimeter-wave band, changes in Dk caused by the solder mask can result in a center frequency shift of several GHz; therefore, high-frequency routing areas typically require<strong>Solder Mask Openings (Changed from \u201cSolder Mask Defined\u201d to \u201cNon-Solder Mask Defined\u201d)<\/strong>, or factor the impact of solder mask into the simulation during the design phase.<\/p>\n<h3>8.4 Scratches on the Panel Surface<\/h3>\n<p>PTFE is a soft material, and scratches are easily caused during handling and transfer between processes; the burrs on the copper foil at the scratched areas act as radiation sources at high frequencies. Control measures include: using [measures] between processes.<strong>Separator Sheets and Specialized Trays<\/strong>, Do not stack; operators must wear gloves; and use a vacuum pen when transferring boards.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" class=\"alignnone size-large wp-image-9562\" src=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2024\/11\/high-frequency-pcb.webp\" alt=\"High-Frequency Printed Circuit Boards\" srcset=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2024\/11\/high-frequency-pcb.webp 1024w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2024\/11\/high-frequency-pcb-300x225.webp 300w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2024\/11\/high-frequency-pcb-768x576.webp 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<h2>9. Six Things That Must Be Clearly Defined During the Design Phase<\/h2>\n<p>When placing an order for high-frequency PCBs, these six items must be specified in the drawings or process specifications; otherwise, the PCB manufacturer will have to rely on experience, and the results will inevitably deviate from expectations:<\/p>\n<ol>\n<li><strong>Sheet Grade and Thickness Tolerances for Media<\/strong>: Do not simply write \u201dRogers 4350B\u201d; clearly specify the thickness (e.g., 0.254 mm) and the acceptable tolerance (\u00b110% or tighter).<\/li>\n<li><strong>Types of Copper Foil<\/strong>: Low-profile copper foil (VLP or RTF) is explicitly required; standard electrolytic copper suffers from significantly increased loss at high frequencies.<\/li>\n<li><strong>Impedance Control Requirements<\/strong>: Target values, tolerances (typically \u00b17% or \u00b15%), and the positions of the impedance test strips.<\/li>\n<li><strong>Copper Thickness and Surface Treatment<\/strong>: For high-frequency trace areas, prioritize silver plating or ENIG; tin plating should be avoided because its uneven surface can affect millimeter-wave performance.<\/li>\n<li><strong>Solder Mask Window Requirements<\/strong>: Clarify whether high-frequency traces are allowed to cross over the solder mask.<\/li>\n<li><strong>Acceptance Criteria<\/strong>: Are cross-section analysis, thermal stress analysis, impedance reports, and insertion loss testing required?<\/li>\n<\/ol>\n<p>Key considerations regarding cabling are equally important, especially<strong>Avoid routing across partitions, keep reference planes intact, and use gradually varying trace widths rather than right-angle turns.<\/strong>. For details, please refer to<a href=\"\/en\/blog\/12-high-frequency-pcb-design-tips\/\">12 Key Tips for High-Frequency PCB Design and Routing<\/a>\u4e0e<a href=\"\/en\/blog\/pcb-high-frequency-circuit-board-wiring-precautions\/\">Considerations for High-Frequency PCB Routing<\/a>. For an analysis of the characteristics of RF circuits, see<a href=\"\/en\/blog\/four-characteristics-of-pcb-rf-circuit\/\">Four Key Characteristics of PCB RF Circuits<\/a>\u3002<\/p>\n<h2>10. Cost Structure and Product Selection Decisions<\/h2>\n<p>Materials account for as much as 50\u201370% of the total cost of high-frequency circuit boards, far exceeding the 30\u201340% for standard circuit boards. Three practical approaches to cost reduction:<\/p>\n<ul>\n<li><strong>Local Mixed Pressure<\/strong>: Use high-frequency materials only on the layers carrying high-frequency signals, and FR-4 on the remaining layers; this can reduce material costs by 40\u201360%. The trade-off is increased manufacturing complexity.<\/li>\n<li><strong>Downshifting and Gear Selection<\/strong>: First, calculate the actual Df required based on the link budget; don\u2019t assume that \u201dthe more expensive, the better.\u201d For many applications below 6 GHz, the RO4350B is more than sufficient.<\/li>\n<li><strong>Domestic Substitution<\/strong>: For applications below 20 GHz that require stable batch production and do not have strict Dk tolerance requirements, domestically produced PTFE systems can cut material costs in half.<\/li>\n<\/ul>\n<p>On the other hand,<strong>There are three situations in which you shouldn\u2019t skimp on materials<\/strong>: Millimeter-wave (30 GHz and above), base station equipment requiring long-term temperature stability in outdoor environments, and aerospace and medical applications where the cost of a single failure is extremely high.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"455\" height=\"256\" class=\"alignnone size-large wp-image-6454\" src=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/what-is-a-high-frequency-high-speed-pcb-board.jpg\" alt=\"High-Frequency, High-Speed PCBs\" srcset=\"https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/what-is-a-high-frequency-high-speed-pcb-board.jpg 455w, https:\/\/www.jingpengpcb.com\/wp-content\/uploads\/2023\/08\/what-is-a-high-frequency-high-speed-pcb-board-300x169.jpg 300w\" sizes=\"auto, (max-width: 455px) 100vw, 455px\" \/><\/p>\n<h2>11. Conclusion<\/h2>\n<p>High-frequency PCBs play a crucial role in the electronics industry. They support advancements in modern communications, radar, satellite technology, and other fields, enabling us to better explore and understand the electronic world in the microwave and millimeter-wave bands.<\/p>\n<p>Understanding the definition, applications, classifications, and manufacturing processes of high-frequency PCBs is crucial for electronic engineers and designers. Only by gaining a thorough understanding of these key concepts can they better address evolving technical demands and drive innovation in the electronics field.<\/p>\n<p>There are also specific considerations for storing high-frequency circuit boards: PTFE and ceramic fillers can experience performance drift after absorbing moisture, so they should be used as soon as possible after opening the package, and temperature and humidity must be controlled during storage. For specific requirements, please refer to<a href=\"\/en\/blog\/storage-requirements-and-shelf-life-of-high-frequency-pcb\/\">Storage Requirements and Shelf Life of High-Frequency PCBs<\/a>. For an analysis of the advantages and disadvantages of this alternative approach using ceramic substrates, see<a href=\"\/en\/blog\/advantages-and-disadvantages-of-ceramic-pcb-board\/\">Advantages and Disadvantages of Ceramic PCBs<\/a>\u3002<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<h3>1. What is a high-frequency PCB?<\/h3>\n<p>High-frequency PCBs are specialized circuit boards used in high-frequency and microwave applications, typically operating at frequencies of 1 GHz or higher.<\/p>\n<h3>2. What are the main application areas for high-frequency PCBs?<\/h3>\n<p>High-frequency PCBs are primarily used in mobile communication products, power amplifiers, passive components, automotive collision avoidance systems, satellite systems, and other fields.<\/p>\n<h3>3. What are the challenges involved in the manufacturing process of high-frequency PCBs?<\/h3>\n<p>\u9ad8\u9891PCB\u677f\u5236\u9020\u7684\u96be\u70b9\u5305\u62ec\u6c89\u94dc\u3001\u56fe\u8f6c\u3001\u8680\u523b\u3001\u7ebf\u5bbd\u7684\u7ebf\u8def\u7f3a\u53e3\u3001\u7eff\u6cb9\u5de5\u5e8f\u7684\u63a7\u5236\u4ee5\u53ca\u5404\u5de5\u5e8f\u7684\u8d28\u91cf\u63a7\u5236\u7b49\u3002<\/p>\n<h3>4. \u4e3a\u4ec0\u4e48\u9ad8\u9891PCB\u677f\u5728\u7535\u5b50\u9886\u57df\u4e2d\u5982\u6b64\u91cd\u8981\uff1f<\/h3>\n<p>\u9ad8\u9891PCB\u677f\u4e3a\u7535\u5b50\u8bbe\u5907\u63d0\u4f9b\u4e86\u5173\u952e\u7684\u652f\u6301\uff0c\u7279\u522b\u662f\u5728\u9ad8\u9891\u548c\u5fae\u6ce2\u9886\u57df\u3002\u5b83\u4eec\u7684\u6027\u80fd\u548c\u8d28\u91cf\u76f4\u63a5\u5f71\u54cd\u7740\u8bbe\u5907\u7684\u6027\u80fd\u548c\u53ef\u9760\u6027\u3002<\/p>\n<h3>5. \u5982\u4f55\u9009\u62e9\u9002\u5408\u7684\u9ad8\u9891PCB\u677f\u6750\u6599\uff1f<\/h3>\n<p>\u9009\u62e9\u9002\u5408\u7684\u9ad8\u9891PCB\u677f\u6750\u6599\u9700\u8981\u8003\u8651\u7535\u6027\u80fd\u3001\u5316\u5b66\u7a33\u5b9a\u6027\u4ee5\u53ca\u4fe1\u53f7\u635f\u5931\u7b49\u56e0\u7d20\uff0c\u6839\u636e\u5177\u4f53\u5e94\u7528\u9700\u6c42\u8fdb\u884c\u9009\u62e9\u3002<\/p>\n<h3>6. Dk \u548c Df \u54ea\u4e2a\u66f4\u91cd\u8981\uff1f<\/h3>\n<p>\u770b\u9891\u7387\u300210 GHz \u4ee5\u4e0b Df\uff08\u635f\u8017\uff09\u901a\u5e38\u4e3b\u5bfc\u63d2\u5165\u635f\u8017\uff0c\u4f18\u5148\u770b Df\uff1b10 GHz \u4ee5\u4e0a\u5bfc\u4f53\u635f\u8017\uff08\u7531\u94dc\u7b94\u7c97\u7cd9\u5ea6\u51b3\u5b9a\uff09\u4f1a\u8d85\u8fc7\u4ecb\u8d28\u635f\u8017\uff0c\u6b64\u65f6\u4f4e\u8f6e\u5ed3\u94dc\u7b94\u7684\u91cd\u8981\u6027\u4e0d\u4e9a\u4e8e Df\u3002\u53e6\u5916 Dk \u7684\u7a33\u5b9a\u6027\uff08TCDk \u4e0e\u6279\u6b21\u516c\u5dee\uff09\u5728\u6beb\u7c73\u6ce2\u9891\u6bb5\u5f80\u5f80\u6bd4 Dk \u7edd\u5bf9\u503c\u66f4\u5173\u952e\u3002<\/p>\n<h3>7. \u9676\u74f7\u586b\u5145\u6750\u6599\u548c PTFE \u600e\u4e48\u9009\uff1f<\/h3>\n<p>\u9676\u74f7\u586b\u5145\u70ed\u56fa\u6027\u6750\u6599\uff08\u5982 RO4350B\uff09\u52a0\u5de5\u6027\u63a5\u8fd1 FR-4\uff0c\u53ef\u7528\u5e38\u89c4\u6c89\u94dc\u5de5\u827a\uff0c\u6210\u672c\u76f8\u5bf9\u4f4e\uff0c\u9002\u5408 20 GHz \u4ee5\u4e0b\u7684\u5927\u591a\u6570\u573a\u666f\u3002PTFE \u4f53\u7cfb Df \u66f4\u4f4e\uff08\u53ef\u5230 0.0009\uff09\uff0c\u4f46\u5b54\u91d1\u5c5e\u5316\u5fc5\u987b\u505a\u94a0\u8418\u5904\u7406\u6216\u7b49\u79bb\u5b50\u6d3b\u5316\uff0c\u5de5\u827a\u96be\u5ea6\u4e0e\u6210\u672c\u90fd\u66f4\u9ad8\uff0c\u53ea\u5728\u6beb\u7c73\u6ce2\u4e0e\u6781\u4f4e\u635f\u8017\u573a\u666f\u624d\u5fc5\u8981\u3002<\/p>\n<h3>8. \u4e3a\u4ec0\u4e48\u9ad8\u9891\u677f\u5e38\u7528\u6df7\u538b\u7ed3\u6784\uff1f<\/h3>\n<p>\u4e3a\u4e86\u964d\u672c\u3002\u53ea\u5728\u9ad8\u9891\u4fe1\u53f7\u6240\u5728\u5c42\u4f7f\u7528\u9ad8\u9891\u6750\u6599\uff0c\u5176\u4f59\u5c42\u7528 FR-4\uff0c\u6750\u6599\u6210\u672c\u53ef\u964d 40\u201360%\u3002\u4ee3\u4ef7\u662f\u4e24\u79cd\u6750\u6599\u7684 CTE \u4e0e\u538b\u5408\u6e29\u5ea6\u7a97\u53e3\u5fc5\u987b\u5339\u914d\uff0c\u5426\u5219\u4f1a\u5206\u5c42\u6216\u7fd8\u66f2\uff0c\u56e0\u6b64\u6df7\u538b\u65b9\u6848\u6253\u6837\u9636\u6bb5\u5fc5\u987b\u505a 288 \u2103 \u70ed\u5e94\u529b\u6d4b\u8bd5\u9a8c\u8bc1\u3002<\/p>\n<h3>9. \u963b\u710a\u5bf9\u9ad8\u9891\u4fe1\u53f7\u6709\u5f71\u54cd\u5417\uff1f<\/h3>\n<p>\u6709\uff0c\u800c\u4e14\u6beb\u7c73\u6ce2\u9891\u6bb5\u5f71\u54cd\u663e\u8457\u3002\u963b\u710a\u5c42\u7684 Dk\uff08\u7ea6 3.3\u20134.0\uff09\u4e0e\u57fa\u6750\u4e0d\u540c\uff0c\u8986\u76d6\u5728\u5fae\u5e26\u7ebf\u4e0a\u4f1a\u6539\u53d8\u6709\u6548 Dk\uff0c\u53ef\u80fd\u9020\u6210\u51e0\u4e2a GHz \u7684\u4e2d\u5fc3\u9891\u7387\u504f\u79fb\u3002\u5e38\u89c1\u5904\u7406\u662f\u9ad8\u9891\u8d70\u7ebf\u533a\u505a\u963b\u710a\u5f00\u7a97\uff0c\u6216\u5728\u4eff\u771f\u9636\u6bb5\u628a\u963b\u710a\u5c42\u8ba1\u5165\u6a21\u578b\u3002<\/p>\n<h3>10. \u9ad8\u9891\u677f\u6253\u6837\u8981\u5411\u677f\u5382\u4ea4\u4ee3\u54ea\u4e9b\u4fe1\u606f\uff1f<\/h3>\n<p>\u516d\u9879\uff1a\u677f\u6750\u724c\u53f7\u4e0e\u4ecb\u8d28\u539a\u5ea6\u516c\u5dee\u3001\u94dc\u7b94\u7c7b\u578b\uff08\u662f\u5426\u4f4e\u8f6e\u5ed3\uff09\u3001\u963b\u6297\u63a7\u5236\u76ee\u6807\u4e0e\u516c\u5dee\u3001\u94dc\u539a\u4e0e\u8868\u9762\u5904\u7406\u3001\u963b\u710a\u5f00\u7a97\u8981\u6c42\u3001\u9a8c\u6536\u6807\u51c6\uff08\u5207\u7247\/\u70ed\u5e94\u529b\/\u963b\u6297\u62a5\u544a\/\u63d2\u635f\u6d4b\u8bd5\uff09\u3002\u7f3a\u4efb\u4f55\u4e00\u9879\uff0c\u677f\u5382\u53ea\u80fd\u6309\u7ecf\u9a8c\u505a\uff0c\u5b9e\u6d4b\u7ed3\u679c\u5927\u6982\u7387\u504f\u79bb\u8bbe\u8ba1\u3002<\/p>\n<p><strong>Related Recommendations<\/strong>\uff1a<a href=\"\/en\/blog\/tips-for-purchasing-smt-machines\/\">How to Choose the Right SMT Placement Machine<\/a> \u00b7 <a href=\"\/en\/blog\/which-pcb-board-factory-has-good-quality\/\">Which PCB manufacturer offers the best quality?<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>\u968f\u7740\u79d1\u6280\u7684\u8fc5\u731b\u53d1\u5c55\uff0c\u5fae\u6ce2\u548c\u6beb\u7c73\u6ce2\u9886\u57df\u7684\u5e94\u7528\u4e0d\u65ad\u589e\u591a\uff0c\u7535\u5b50\u8bbe\u5907\u7684\u9891\u7387\u9700\u6c42\u4e5f\u9010\u6e10\u6500\u5347\u3002\u5728\u8fd9\u4e2a\u7535\u5b50\u9886\u57df\u7684\u524d\u6cbf\uff0c\u6709\u4e00\u4e2a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4942,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"slim_seo":{"title":"How to Choose High-Frequency PCB Materials? Key Considerations for Processing PTFE and Ceramic-Filled Materials","description":"How to Select Materials and Process High-Frequency Boards? This article explains the definition and classification of high-frequency boards, the characteristics of ceramic-filled thermosetting materials and PTFE, as well as the technical challenges involved. It also highlights common misconceptions to help you avoid easily overlooked details."},"_slim_seo_primary_term_category":0,"_slim_seo_primary_term_post_tag":0,"footnotes":""},"categories":[407,26],"tags":[],"class_list":["post-2348","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pcb-materials","category-blog"],"_links":{"self":[{"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/posts\/2348","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/comments?post=2348"}],"version-history":[{"count":5,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/posts\/2348\/revisions"}],"predecessor-version":[{"id":19879,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/posts\/2348\/revisions\/19879"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/media\/4942"}],"wp:attachment":[{"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/media?parent=2348"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/categories?post=2348"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jingpengpcb.com\/en\/wp-json\/wp\/v2\/tags?post=2348"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}