Rogers Sheet With PTFE, RO3000 Series
Polytetrafluoroethylene (PTFE) is one of the basic components of many high frequency PCBs. It is a thermoplastic fluoropolymer formed from carbon and fluorine that has a high molecular weight and low coefficient of friction. Polytetrafluoroethylene (PTFE) has electrical properties superior to many materials, with high dielectric strength and low dielectric constant (Dk). Solid polytetrafluoroethylene (PTFE) has a Dk of about 2.0 and a very low loss tangent or loss factor (Df) of about 0.0003.
By combining polytetrafluoroethylene (PTFE) with different material additives, Rogers offers outstanding performance and reliability for every composite combination. Whether combining polytetrafluoroethylene (PTFE) with glass materials, ceramics, or other fillers, the circuit materials offer a wide selection of electrical and mechanical properties to meet the ever-evolving needs of electronics across the entire frequency spectrum, even in the millimeter-wave frequency range well beyond 110 GHz.
In the Rogers RO3000 Series family of materials, the initial low Dk of polytetrafluoroethylene (PTFE) is enhanced by the addition of ceramic materials, sometimes using braided glass reinforcements.While the additives produce a range of circuit materials with a wide selection of Dk values (from as low as 3 to just above 10), these values are tightly controlled through each circuit panel. With these additives, the benefits of polytetrafluoroethylene (PTFE) are enhanced in terms of electrical consistency and mechanical strength, and the tight tolerances on Dk values are quite impressive.
For example, the lowest Dk value belongs to Rogers RO3003, with a process Dk value of 3.00 through the Z-axis of the material measured at 10 GHz. the Dk tolerance across the entire material is very significant, with a minimum of ±0.04, demonstrating impressive control in the fabrication of this material with polytetrafluoroethylene (PTFE) and the other material components.
In the case of RO3003, the primary material added was ceramic, which would result in a Dk slightly higher than the nominal Dk of polytetrafluoroethylene (PTFE.) To achieve higher mechanical strength, not only ceramic but also glass cloth reinforcement was added to the Rogers RO3203 laminate, and the process Dk at 10 GHz increased only slightly by 3.02, while maintaining the same tight Dk tolerance of ± 0.04.
The higher the Dk value, the more miniaturized the circuit characteristics are for a given signal frequency, and the building blocks of the RO3000 laminate line provide Dk values as high as 10 by supporting the polytetrafluoroethylene (PTFE) with varying mixtures of ceramic and woven glass reinforcements.For example, the RO3035 laminates increase the Dk to 3.50 by adding ceramic materials to the polytetrafluoroethylene (PTFE), while maintaining a Dk tolerance of ±0.05. By adding more ceramics or different types of ceramics to polytetrafluoroethylene (PTFE), RO3006 laminates increase the process Dk value to 6.15 while maintaining a Dk tolerance of ±0.15.
The laminates are also available with woven glass reinforcement for mechanical strength and the same Dk values and Dk tolerances as RO3206 laminates.RO3010 laminates can be added with a ceramic portion of a polytetrafluoroethylene (PTFE) composite to achieve a process Dk of 10.20 and a Dk tolerance of ±0.30. It can also be reinforced with woven glass and provide the same process Dk of 10.20 with a slightly worse Dk tolerance of ±0.50 as RO3210 laminates.RO3206 laminates are also available with a woven glass reinforcement and provide the same process Dk of 10.20, with a slightly worse Dk tolerance of ±0.50. Dk tolerance is slightly worse at ±0.50, the same as RO3210 laminates.
By tightly controlling the amount of material in each composite, the Dk tolerance will always remain tight, even as the Dk value increases. In each case, the quality of the individual materials, including the base polytetrafluoroethylene (PTFE) material, is critical to achieving composite Dk values within such a tight window.
For users who prefer a Dk value as close as possible to the base polytetrafluoroethylene (PTFE) value of approximately 2, Rogers RT5000 RF circuit materials include RT5870 laminates with a process Dk value of 2.33, and RT5880 laminates with a process Dk of 2.20; the Dk values of both materials are maintained throughout the material with an amazingly tight tolerance of ±0.02. These base polytetrafluoroethylene (PTFE) circuit laminates use composites with different random glass fiber contents to achieve different Dk values.
As these circuit material examples show, the composition of the laminate contributes significantly to its performance, but also affects how the circuit material is processed when the PCB is manufactured. While the RT5870 and RT5880 laminates provide Dk values close to those of polytetrafluoroethylene (PTFE) and are capable of delivering excellent performance at the highest frequencies, they are not very friendly to the circuit fabrication process, especially when using the processing of low-cost FR-4 circuit materials as a reference. On the other hand, polytetrafluoroethylene (PTFE)-based RO3000 circuit materials are more compatible with larger volume circuit manufacturing processes due to the use of composite materials.
Shenzhen Xinchenger Electronics Co., Ltd. is a professional 2-36 layer high frequency PCB circuit board manufacturers, can be expedited production of high frequency PCB boards, mixed pressure high frequency boards, special circuit boards, microwave RF boards, microwave antenna boards and other products, the company is always on hand: Rogers, Taconic, F4B, TP-2, FR-4, and other high-frequency boards, expedited sampling 24 hours.
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