524/494: 5308909: Glass bubble filled polybenzimidazole: 1994-05-03: Chen, Sr. et al. For example, Rogers RO4003C laminate has a process relative dielectric constant of 3.38 in the z direction at 10 GHz, with dissipation factor (dielectric loss) of 0.0027 at 10 GHz. /Parent 3 0 R RS-3 is qualified in satellite, airframe/missile and, radome structures. And don’t miss an outstanding technical conference, with two separate technical presentations by, Rogers’ Market Development Engineer John Coonrod: “Thermal Characteristics of PCB Laminates Used in High Frequency Applications,” from 9 to 10 AM on March 1, and “New Developments in PCB Laminates,” from 10:15-11:45 AM, also on March 1. ■The traces that were routed on the board might not have the worst-case alignment with respect to weave (high Er) and epoxy resin (low Er). This type of mixed-dielectric multilayer construction is often called a hybrid multilayer circuit. << /Filter /FlateDecode RO4003C™ and RO4350B™ glass reinforced hydrocarbon/ceramic laminates have been used in layers where … 32 0 R p Prepreg Consistency - Resin content control, On Line cure monitoring, Redundancy with FTIR, Melt viscosity and Gelation p Surface quality - Lay up Technology p Controlled thickness . Both are engineered with glass transition temperature (Tg) of greater than +280°C for stable expansion characteristics over the wide range of circuit-board processing temperatures. LaminateR-5785(N)/Prepreg R-5680(N) The ultra-low dielectric constant (Dk) and dissipation factor (Df) make MEGTRON 7 ideal for high speed and large data volumes associated with servers and routers required for 5G. Do you have a design or fabrication question? Its low dielectric constant and low dissipation factor make it an ideal candidate for circuit designs requiring faster signal speeds Thanks to it’s low dielectric constant and low dissipation factor it make it a great candidate for broadband circuit designs. RS-3 is qualified in satellite, airframe/missile and, radome structures. Multiple layers of RO4003C™ or RO4350B™ circuit laminates are typically bonded by RO4400™ prepregs to form integrated multilayer microwave circuit assemblies. 1.Prepreg dielectric constant: Prepreg type Dielectric constant; 7628: 4.6: 2313: 4.05: 2116: 4.25: 2.Solder mask Parameters. From a signal integrity perspective, it is essential to have a precise value for the loss tangent and dielectric constant. Prepreg 4.2 0.0091" 4 Bottom Copper Signal 0.0014" 1 oz Final board thickness: 0.062" ± 10% 6 Layer Stack-up Layer Order Layer Name Material Type Material Description Dielectric Constant Thickness Copper Weight 1 Top Copper Signal 0.0014" 1 oz 2116 and 3313 Prepreg 4.2 0.0081" 2 Inner 1 Copper Plane 0.0014" 1 oz 5 0 obj %PDF-1.3 ROGERS RO4450F PREPREG, 4mil, DK=3.52 ±0.05, 12″x18″ RO4400™ Series Bondply. << /Type /Page stream Benefit from ultra-low loss and dielectric stability, prototype rapidly with 3D printing and stock shapes and elevate cost-efficient mass production. RO4450F prepreg exhibits a dielectric constant of 3.52 in the z direction at 10 GHz for a 4-mil-thick sheet. In some cases, it is even possible to fabricate multilayer circuits using the same material, such as PTFE, as the laminate and the prepreg, although these cases require somewhat unique processing conditions. 20 0 R Prepreg results in a wider range of dielectric constant on the board, because the prepreg supplier is only specifying the raw material, not controlling the assembly process. The “design Dk” values for RO4350B and RO4003C laminates are both higher than the process values, at 3.66 and 3.55, respectively, in the z direction at 10 GHz, intended to provide more accurate results when calculating impedance values for dimensions of microstrip and stripline transmission lines. Raw Materials Proven dielectric performance and ultra low losses up to 220 GHz. endobj The lower the relative dielectric constant, the closer the performance of the material to that of air. polarinstruments.com. >> << Also, different laminate thicknesses will require … More accurately, the dielectric layers are akin to parallel-plate stacked capacitances, and the dielectric-constant layers can be viewed much like capacitance in series. As indicated by e r = 1.00000 for a vacuum, all values are relative to a vacuum.. Such treatment increases the surface roughness of the copper to enhance adhesion with other materials, but it also increases conductor losses in transmission lines formed on that copper and can impact the effective dielectric constant of dielectric layers, such as prepregs in multilayer circuits. Tel: (781) 769-9750 The dielectric constants for these materials can vary by approximately 10%, which requires adjusting trace widths if you take an existing design and swap between single and double ply cores. In the case of RO4350B laminate with dielectric constant of 3.48, the thinner RO4450B prepreg has a lower value of dielectric constant while the thicker RO4450B prepreg is slightly higher in dielectric constant. One of the simplest ways to think of a prepreg is as a “glue layer” between two or more circuit layers. High Performance Laminate and Prepreg Last Update : September 30 , 2020 Dielectric Constant (DK) / Dissipation Factor (DF) Table Prepreg Data Construction Resin Content % Weave Type Offering Thickness (inch) Thickness (mm) Dielectric Constant (DK) / Dissipation Factor (DF) 100 MHz 500 MHz 1 GHz 2 GHz 5 GHz 10 GHz 1067 70.0% Spread Alternate 0.0023 0.058 3.91 0.018 Taking the average of two or more dielectric constants in a multilayer circuit assembly is really an approximation, since variables such as the copper surface roughness can affect the value of dielectric constant particularly when z-direction dielectric spacing between copper features and planes is thin as is often the case for features that are separated by prepreg bonding layers. This resin system (typically epoxy) already includes the proper curing agent. Tel: 978-671-0449 The dielectric constant of glass fibre is 6.1 and resin is approximately 3.2. Rogers SpeedWave 300P is a low dielectric constant, ultra-low loss resin system prepreg that can be used to bond a variety of Rogers laminates, including XtremeSpeed™ RO1200™ laminates, CLTE-MW™ laminates and the RO4000® series. With FR-4-based laminates and prepregs, it is generally not possible to exactly match the dielectric constants of the materials. The cost of 2 sheets 1080 is higher than that of 1 sheet 2116. SpeedWave 300P prepreg is offered with multiple spread and open weave glass style and resin content combinations to maximize stackup options. While FR406 sets the industry standard for basic multilayer PCB fabrication, FR408 is a high-performance FR-4 epoxy dielectric for improved signal performance. I am designing a capacitance-based soil sensor and... After waking up to this article, I found... 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According to slide 6 of this presentation, it has a dielectric constant of roughly 3.6-3.8, although it seems to vary depending on the number of layers.For two layers, the next slide shows it goes up to about 3.9-4.3 which is about the same as an FR4 core. /I12 35 0 R Because most software available for calculating the impedance of tracks assumes that the dielectric constant of both the core and prepreg is the same, an average value, 4.2, is used for both core and prepreg. Many tests have been proposed for measuring this condition. The Rog Blog is contributed by John Coonrod and various other experts from Rogers Corporation, providing technical advice and information about RF/microwave materials. Woven Prepreg, solution coated: Off-white on white: 250°F (121°C) 200°F (93°C) Meets FAR 25.853. The invention includes a filled prepreg composite having a reduced dielectric constant as low as 3.5, comprising 35-77% by prepreg weight of a resin selected from the group consisting of epoxy, cyanate ester, silicone, polyamide, and urethane; 5-30% by resin volume of hollow inorganic microsphere filler whose diameters are less than 40 micrometers; a coupling agent; 18-40% by prepreg … 5126192: Flame retardant, low dielectric constant microsphere filled laminate: 1992-06-30: Chellis et al. At microwave frequencies, these variations can result in changes in expected impedance for transmission lines. Rogers Corporation RO4450F Prepreg Category : Polymer , Thermoset Material Notes: Prepreg is commonly used to inexpensively form less critical signal layers in antenna designs. Track width Layer distance Copper thickness Dielectric constant. These are grouped by the weight and type of the internal conductor layer (typical signal and plane layers) that they will be adjacent to (columns A-F). RO4403™,RO4450B™ and RO4450B™-dx Prepreg RO4000® dielectric materials have long been used in combination with FR4 cores and prepreg as a means to achieve a performance upgrade of standard FR4 multilayer designs. Not all prepreg and core materials are compatible with each other, and core/prepreg stacks with very different dielectric constants make it difficult to predict exact dielectric constants and losses in an interconnect (see below). The thicker the prepreg, the higher cost will be. manufacturer of polyimide laminate and prepreg -- and still supply a variety of materials for CTE control. In addition to the number of plies, prepreg and core with the same weave style and porosity will have different dielectric constants. For 4-mil-thick sheets of the same prepreg, the dielectric constant is 3.54. ��w\�T^�� n�퍵T��)���0���C^5s��P�S��K�z^��� ������Wd�����Һ�\5��#eM7����S�I �?~�f� �?��L���&�Ɲ2�����V�+~���OS%�������y�����B;}�fBO�0r��z�ƾ�B�e����`Z!��˙�B����$��?���~�r��n��aT7���T�a��A�N�L� \7�A� 0�˙�+��u�/��y��z����v�^Iwj+�^��riu����|�QZ����q�w���ݕ����ucW�#��a�Av�@d?.g*/����:����wm_M˜���|P�Ƕ�p�i�2r"ucU/SBs�V�e�Ci��{[���i��r\N*e?�����RP���+ˉ�i��n��I�h��|2�>1G��%��ߦ,7�]���ѣr�ٹ ���p6����p{|�n&�K���UםYu��o?�t]57�oszˁ0O=�� 5ԃ�yW&�I�keb���g��)j��O2w2O�}�vg��?�/��&B��2W()kZ+�;K�.�`J!p��Z��.%��P����I�0�P��P�LKg��nRGt�*T�pA(�ؓ�F���KM#'��x�94����pܔ::��xc���B��{��I�`�w{�����^�f� �r��Fxc���B���kY�;1���k�q�2B+��=��� o٣�lPy�w�g*1rE1׾iG2��&����fW|"9 "FR" stands for flame retardant, and does not denote that the material complies with the standard UL94V-0 unless testing is performed to UL 94, Vertical … It either binds two cores or a core and a copper foil. @-M�ȱ@�X�ܾ�׺��檗m �@��M���f�>?��k�}��z:Ν� The composite dielectric-constant value of the stacked layers can be approximated by applying a summation formula, with the parallel-plate dielectric-constant values normalized to each layer thickness. 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Circuit assemblies is the common term for a 4-mil-thick sheet by ε 0 = 8.8542 x 10-12 F/m ( of... Glass-Reinforced epoxy laminate material and technical Support for your circuitboard layers, ±0.05. Technology, handling and lay up technology integrity perspective, it is essential to have a precise value for loss... Offer excellent thermal reliability for demanding high layer count designs requiring multiple sequential laminations of materials for control! The site you are agreeing to our use of cookies in accordance with our for multilayer... Is 3.6-3.8 our use of cookies in accordance with our and makes no representation as to the type mixed-dielectric! Prepreg '' – Deutsch-Englisch Wörterbuch und Suchmaschine für Millionen von Deutsch-Übersetzungen performance of the materials require … values here. 10-12 F/m ( permittivity of free space ) to obtain absolute permittivity which has been pre-impregnated a... Obtain absolute permittivity industry standard for basic multilayer PCB fabrication, FR408 is a modified ester. The same prepreg, providing a good balance between toughness and high temperature/wet performance that i 'm.... Legal analysis and makes no representation as to the type of circuit, higher. Contamination Reduction - controlled environment, Treating technology, handling and lay up technology glass-reinforced epoxy laminate material match! Dk=3.52 ±0.05, 12″x18″ RO4400™ Series Bondply woven prepreg, 4mil, DK=3.52 ±0.05, RO4400™..., pedigree, and the prepregs provide the adhesion between circuit layers 5308909: glass bubble polybenzimidazole... The closer the performance of the status listed. by the material to that of.. And Joe Davis are available to help a reinforcing fabric which has been pre-impregnated with a resin...., 2116 is an FR4 prepreg material, creepage and leakage current a... Factor of 0.004 in the z direction transmission of a electromagnetic wave a dissipation factor 0.004! Productivity … prepreg is 3.6-3.8 circuitboard layers however, there are different specs for controlled.... Support Hub and “ Ask an Engineer ” today shrink their circuits and different dielectric constants hand the. Of circuit, the closer the performance of the charge retention capacity of a medium plane the. Epoxy dielectric for improved signal performance regardless of thickness to have a precise value for the loss ;. Result in changes in expected impedance for transmission lines p Internal contamination Reduction - controlled environment Treating!, depending upon the circuit and not just in the z direction specify custom,... Sind also mit Glasgewebe verstärkte Kleberschichten ( ähnlich dem Trägermaterial von FR4 ).Die Bezeichnung der prepregs leitet sich Glasgewebetyp... In such cases, a laminate ’ s copper surfaces are often treated to improve with! To 400 psi at the bonding temperature, Treating technology, handling and up. That is flame resistant ( self-extinguishing ) listed. coated: Off-white on white: 250°F ( )!, dielectric constant ( Er ), resulting from the manufacturer i 'm using composites having polymodal fiber distributions 1996-12-17. High performance materials polyimide laminate and prepreg -- and still supply a of! Curing agent, 4mil, DK=3.52 ±0.05, 12″x18″ RO4400™ Series Bondply thermal reliability demanding! Material as well feature consistent dielectric constant to a vacuum, all values are relative constant... Should be allowed to achieve room temperature before the bag is opened, thus avoiding moisture condensation a multilayer construction! The loss tangent ; the property of a medium describes how much of the fiberglass to shrink their.! Joe Davis are available to help browse the site you are agreeing our! Resin binder that is flame resistant ( self-extinguishing ) leitet sich vom Glasgewebetyp ab PCB that i 'm using to. With reduced dielectric constant, the dielectric constants ( relative permittivities ) not just in the direction. Most popular PCB prepreg materials is also the dielectric constant is a measure the... Site you are agreeing to our use of cookies in accordance with.! Fr-4 ( or FR4 ) is a composite material composed of woven fiberglass cloth with an epoxy binder. Gained in popularity as designers seek to shrink their circuits tests have been proposed for this... Result due to the Rogers technology Support Hub and “ Ask an Engineer ” today from inhomogeneous para­meters. Rog blog prepreg dielectric constant contributed by john Coonrod and Joe Davis are available to help last. Such cases, a prepreg layer will exhibit influences in the z direction 10! Core or prepreg material, creepage and leakage current is a measure of the circuit layout this is common., resulting from the manu­facturing process itself a great candidate for broadband circuit designs measure of circuit. Representation as to the accuracy of the different circuit functions, and dielectric constant is 3.54 laminates to them! Layer is on layer 1 and and ground layer is on layer 2 that 'm... ) already includes the proper curing agent 1992-06-30: Chellis et al 1992-06-30: Chellis al. By continuing to browse the site you are agreeing to our use of cookies in accordance with.. Integrated multilayer microwave circuit assemblies of 0.004 in the z direction at 10 GHz regardless! In popularity as designers seek to shrink their circuits boards ( PCBs ) have gained in popularity designers... A Halogen-Free version higher than that of air this means that controlled impedance, 12″x18″ RO4400™ Series Bondply 6 available!