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Adv ance d Ma ter ia ls for the De signs of Tomorrow Microwave & RF Materials Guide RF & Microwave Materials Guide Arlon Microwave Materials specializes in products made from fluoropolymers (i.e. PTFE), ceramic filled fluoropolymers, ceramic-filled hydrocarbon thermosets, and other materials that deliver the electrical performance needed in frequency-dependent circuit applications. These products are supplied as copper-clad laminates with bonding plies, or prepregs, for production of multilayer printed circuits. Arlon has over 55 years of experience in microwave materials, today providing products that are used to make combiner boards and feed networks for microwave applications as well as base station antennas and power amplifier boards for the wireless telecommunications infrastructure market. Our facilities in California, Delaware and China employ state-of-the-art production equipment, engineered to provide cost-effective, flexible manufacturing capacity to permit quick response to customer requirements while meeting the most stringent quality and tolerance demands. All of our manufacturing sites are ISO 9001: 2008 registered, and through rigorous quality control practices and commitment to continuous improvement, we are dedicated to meeting and exceeding our customer’s requirements. To better service our global customer base, Arlon created the venture, Arlon Material Technologies Co, Ltd. in Suzhou, Jiangsu Province, China. This venture includes both a Finishing Center and a manufacturing facility. The finishing center is located in Suzhou and has been operational since mid-2004. The Manufacturing Facility opened in October 2006. This facility contains a new, State-of-the-art vacuum press that has capability to laminate both High Temperature PTFE Microwave Laminates, High Performance Polyimide, and Low-loss Thermoset Based Substrates. This facility is equipped with the highest degree of process control in the industry. A lower cost, higher performance, series of products lower loss have been launched in the 2.50 to 3.50 range. The AD “A” Series includes AD255A, AD260A, AD300A and others. These microwave Laminates utilize ceramic technologies to reduce loss and tighten tolerances. They are well suited for Base Station Antennas, Satellite Radio Antennas and Power Amplifiers where low loss is critical. These products are a significant improvement in cost/performance over traditional PTFE/Glass based laminates, As further cost/performance improvement over AD “A” products, AD “C” series are the third generation commercial laminate materials, designed with enhanced mechanical and electrical performance for today’s telecommunication infrastructure. One of our most exciting products is a lower loss version of CLTE, called CLTE-XT. CLTE-XT has the lowest loss, lowest thermal expansion, highest phase stability, and lowest moisture absorption of any product in its class. It is truly “Best-in-Class.” Further innovations in new low loss materials are also targeted in the near future and Arlon remains committed to the development of advanced materials targeted for high performance circuit boards and electronics. Arlon maintains a significant commitment to research & development. Exciting recent products include the Thermally Conductive PTFE-based laminates, TC600 and TC350. These materials provide “Best-in-Class” Thermal Conductivity (W/mk) for applications where temperature extremes are normal and Heat Rejection is a Primary Consideration. These materials lower junction temperatures for Improved Power Amplifier Reliability and pull heat away from critical solder joints that can fatigue through cycling. TC600 and TC350 also offer greater Thermal Phase Stability for applications that are cycled and still need to maintain tight dielectric constant tolerances for phase sensitive circuitry. RF & Microwave Materials Guide This guide covers typical properties for a wide variety of Arlon’s microwave material products, ranging from our high performance PTFE laminates to our cost-optimized PTFE and non-PTFE based RF laminates and composites. Although a comprehensive summary of Arlon’s capabilities and full product-line is not feasible, this guide provides a good overview of the core microwave material products that Arlon produces and covers typical properties as well as the wide variety of standard product options in laminate thicknesses and nominal dielectric constants. To reduce complexity and confusion, the following information represents the standard and common items. Please contact Customer Service if you do not see your desired thickness or dielectric constant or require additional assistance. For more detail on a specific product, please refer to the product specific datasheet available on-line at www.arlon-med.com. Table of Contents Product Overview 3-4 CLTE-XT, CLTE-AT, CLTE 5 TC Series (Thermally Conductive) 6 AD “C” Series (Third generation of AD Series) 6 AD “A” Series (Improvements on AD Series) 7 Higher Dielectric Constant (4.10 to 11) 8 AD Series 9 DiClad 10 CuClad 11 IsoClad 12 AR Series 13 25N/FR Low Loss Thermosets 13 Copper Cladding 14 Arlon Part Numbers 15 Customer Service/Sales Contact Information Back Properties listed in this guide are for reference purposes only and are subject to change without notice; they are not to be used as specification limits. This information creates no expressed or implied warranties. The properties of Arlon laminates may vary depending on the design and application. CLTE-XT CLTE-AT CLTE Glass, PTFE and Micro-Dispersed Ceramic Glass, PTFE and Micro-Dispersed Ceramic Glass, PTFE and Micro-Dispersed Ceramic 2.94* 3.00 2.98* 0.0012 0.0013 0.0023* -9 -10 -9 8 8 10 8 8 12 Dielectric Constant @ 10 GHz Dissipation Factor @ 10 GHz Thermal Coefficient of Er ppm/°C Coefficient of Thermal (ppm/°C) Product Composition AD410 AD430 AD450 AD450A AD600 AD1000 Glass, PTFE and Micro-Dispersed Ceramic Glass, PTFE and Micro-Dispersed Ceramic Glass, PTFE and Micro-Dispersed Ceramic Glass, PTFE & Ceramic, 0.120” Thick Glass, PTFE and Micro-Dispersed Ceramic Glass, PTFE and Micro-Dispersed Ceramic 4.10 4.30 4.50 4.50 6.15* 10.20* 0.0030 0.0030 0.0035 0.0030 0.0030 0.0023 -55 -55 -233 -200 -241 -380 9 9 8 10 11 8 9 9 11 10 10 10 CLTE-XT, CLTE-AT and CLTE High Performance, Excellent Dielectric Constant Control and Phase Stability with Temperature TC350 TC600 Glass, PTFE and Micro-Dispersed Ceramic Glass, PTFE and Micro-Dispersed Ceramic 3.50 6.15 0.0020 0.0020 -9 -75 7 9 7 9 High Thermal Conductivity, Excellent Dielectric Constant Control and Phase Stability with Temperature High Dielectric Constant for Circuit Militarization & Patch Antenna Applications X Y AD255C AD300C Glass, PTFE and Micro-Dispersed Ceramic Glass, PTFE and Micro-Dispersed Ceramic 2.55 2.97 0.0014 0.0020 -75 -25 16 12 16 12 AD250A AD255A AD260A AD300A AD320A AD350A Glass, PTFE and Micro-Dispersed Ceramic Glass, PTFE and Micro-Dispersed Ceramic Glass, PTFE and Micro-Dispersed Ceramic Glass, PTFE and Micro-Dispersed Ceramic Glass, PTFE and Micro-Dispersed Ceramic Glass, PTFE and Micro-Dispersed Ceramic 2.50 2.55 2.60 3.00 3.20 3.50 0.0015 0.0015 0.0017 0.0020 0.0032 0.0030 -140 -138 -80 -110 -125 -55 12 16 16 12 14 5 15 16 16 12 14 9 AD “C” Series - Enhanced next generation of AD “A” Series. Woven Glass, PTFE and Micro-Dispersed Ceramic AD “A” Series - Lower Loss and Improved Performance over Traditional AD Series. Woven Glass, PTFE and Micro-Dispersed Ceramic DiClad 522 DiClad 527 DiClad 870 DiClad 880 CuClad 250GT CuClad 250GX CuClad 233LX CuClad 217LX IsoClad 933 IsoClad 917 Woven Fiberglass reinforced PTFE Woven Fiberglass reinforced PTFE Woven Fiberglass reinforced PTFE Woven Fiberglass reinforced PTFE Cross Plied Woven Fiberglass rinforced PTFE Cross Plied Woven Fiberglass rinforced PTFE Cross Plied Woven Fiberglass rinforced PTFE Cross Plied Woven Fiberglass rinforced PTFE Non-Woven Fiberglass reinforced PTFE Non-Woven Fiberglass reinforced PTFE 2.40 - 2.60* 2.40 - 2.60* 2.33 2.17, 2.20 2.50 2.40 - 2.55* 2.33 2.17, 2.20 2.33 2.17 0.0018 0.0018 0.0013 0.0009 0.0018 0.0018 0.0013 0.0009 0.0016 0.0013 -153 -153 -161 -160 -170 -170 -171 -151 -132 -157 14 14 17 25 18 18 23 29 31 46 21 21 29 34 19 19 24 28 35 47 Traditional - Highest Performance. PTFE Coated Light Woven Glass Styles, Interdispersed PTFE films AD250 AD255 AD270 AD320 Woven Glass and PTFE Woven Glass and PTFE Woven Glass and PTFE Glass, PTFE and Micro-Dispersed Ceramic 2.50 2.55 2.70 3.20 0.0018 0.0018 0.0023 0.0038 -110 -110 -110 -110 12 12 12 12 15 15 15 15 Original AD Series - Woven Glass and PTFE or Woven Glass, PTFE and Micro-Dispersed Ceramic AR1000 Glass, PTFE and Micro-Dispersed Ceramic 10.00* 0.0030 -233 14 16 AR Series - Legacy Product. Reference AD1000 as a Next Generation Product 25N 25FR Ceramin Hydrocarbon Ceramin Hydrocarbon 3.38 3.58 0.0025 0.0035 -87 50 15 16 15 18 Low Loss Thermoset Resin Systems - Multilayer Capable, non-PTFE N E X T G E N E R A T IO N M IC R O W A V E M A T E R IA L S L E G A C Y A N D O R IG IN A L M IC R O W A V E M A T E R IA L S 3 Product Overview * Refer to Tables for Dielectric Constant and Thickness Options. 20 20 34 7.2 6.5 7 0.02 0.03 0.04 2.02 2.06 2.38 0.56 0.64 0.50 0.02 0.02 0.02 0.00 0.00 0.00 UL94-V0 UL94-V0 UL94-V0 Typical Peel Strength (lbs) Water Absorption (%) Specific Gravity Thermal Conductivity (W/mK) Flammability UL Rating NASA OutgassingExpansion 40 40 42 40 45 20 17 17 > 12 12 12 > 12 0.06 0.06 0.07 0.06 0.04 0.03 2.10 2.10 2.45 2.50 2.45 3.2 0.46 0.46 0.38 0.40 0.46 0.81 NT NT 0.01 NT 0.02 0.01 NT NT NT NT 0.01 0.00 UL94-V0 UL94-V0 UL94-V0 UL94-V0 UL94-V0 UL94-V0 23 35 7 8 0.05 0.03 2.30 3.20 1.03 1.1(z), 1.4(x,y) 0.02 0.02 0.01 0.00 UL94-V0 UL94-V0 Total Mass Loss (%) Collected Volatile (%) Z 50 50 12 13 0.04 0.05 2.30 2.10 0.30 0.45 NT NT NT NT UL94-V0 UL94-V0 95 80 80 125 128 35 14 12 17 13 14 17 0.04 0.04 0.04 0.02 0.02 0.1 2.25 2.30 2.30 2.10 2.09 2.10 0.28 0.30 0.32 0.49 0.45 0.45 NT NT NT NT NT 0.02 NT NT NT NT NT 0.02 UL94-V0 UL94-V0 UL94-V0 UL94-V0 UL94-V0 UL94-V0 173 173 217 252 177 177 194 246 203 236 14 14 14 14 14 14 14 14 10 10 0.03 0.03 0.02 0.02 0.03 0.03 0.02 0.02 0.05 0.04 2.31 2.31 2.26 2.23 2.31 2.31 2.26 2.23 2.27 2.23 0.254 0.254 0.257 0.261 0.254 0.254 0.258 0.261 0.263 0.263 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.03 0.02 0.00 0.00 0.00 0.01 0.00 0.00 0.01 0.01 0.00 0.00 UL94-V0 UL94-V0 UL94-V0 UL94-V0 UL94-V0 UL94-V0 UL94-V0 UL94-V0 UL94-V0 UL94-V0 95 95 95 95 14 14 14 17 0.07 0.07 0.07 0.06 2.40 2.40 2.40 2.40 0.235 0.235 0.235 0.235 NT NT NT NT NT NT NT NT UL94-V0 UL94-V0 UL94-V0 UL94-V0 37 5 0.08 2.84 0.645 0.02 0.00 UL94-V0 52 59 5 5 0.09 0.09 1.70 1.80 0.45 0.45 0.17 0.24 0.01 0.00 N/A UL94-V0 4 0.0051 0.0094 0.0145 0.020 0.025 0.030 0.040 0.045 0.048 0.059 0.060 0.070 0.090 0.100 0.120 0.005 0.010 0.015 0.020 0.025 0.030 0.040 0.050 0.060 0.090 0.125 0.003 0.0053 0.010 0.015 0.020 0.024 0.031 0.040 0.047 0.062 0.093 2.79 2.89 2.94 2.92 2.94 2.94 2.94 2.94 2.95 2.95 2.94 2.95 2.98 3.01 3.01 3.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00 3.02 3.02 2.75 2.85 2.94 2.95 2.96 2.97 2.98 2.98 2.98 2.98 2.98 ±0.03 ±0.03 ±0.03 ±0.03 ±0.03 ±0.03 ±0.03 ±0.03 ±0.03 ±0.03 ±0.03 ±0.03 ±0.03 ±0.03 ±0.03 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.08 ±0.06 ±0.06 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 Inches Millimeters Nominal ToleranceTolerance (Inches) Product Standard Thickness Dielectric Constant CLTE-XT Master Sheet Size** 36” x 48” CLTE-AT Master Sheet Size** 36” x 48” CLTE Master Sheet Size** 36” x 48” 0.130 0.239 0.369 0.508 0.635 0.762 1.016 1.143 1.219 1.499 1.524 1.778 2.286 2.540 3.048 0.127 0.254 0.381 0.508 0.635 0.762 1.016 1.270 1.524 2.286 3.175 0.076 0.135 0.254 0.381 0.508 0.610 0.787 1.016 1.194 1.575 2.362 ±0.0005 ±0.0007 ±0.001 ±0.001 ±0.001 ±0.001 ±0.002 ±0.002 ±0.0024 ±0.002 ±0.002 ±0.003 ±0.003 ±0.003 ±0.003 ±0.0005 ±0.0007 ±0.001 ±0.0015 ±0.002 ±0.002 ±0.0025 ±0.0025 ±0.003 ±0.005 ±0.006 ±0.0005 ±0.0005 ±0.001 ±0.0015 ±0.002 ±0.002 ±0.002 ±0.003 ±0.003 ±0.004 ±0.005 **Master Sheet Sizes are not available on all products or thicknesses. Tolerances are subject to change and custom tolerances may be available. Please contact Arlon Customer Service with questions about material availability. 5 CLTE-XT, CLTE-AT and CLTE CLTE-XT is the next generation of CLTE with “Best-In-Class” Loss Tangent and Lowest Insertion loss in its class. Excellent dimensional stability, Phase Stability and CTE performance. CLTE-AT is commercially priced product. It uses common technologies developed for CLTE-XT, and with some changes to make the product more affordable, but with less stringent tolerances. To maintain its lower cost base, CLTE-AT has less options for copper style and panel sizes. CLTE is Glass/PTFE/micro-dispersed ceramic laminates. Offers superior thermomechanical (CTE) stability and Dk over temperature with best-in-class processibility for a PTFE-based laminate. 2.55 2.55 2.97 2.97 ±0.04 ±0.04 ±0.05 ±0.05 Inches Millimeters Nominal ToleranceTolerance (Inches) Product** Standard Thickness Dielectric Constant AD255C AD300C 0.762 1.524 0.762 1.524 ±0.002 ±0.003 ±0.002 ±0.002 0.030 0.060 0.030 0.060 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 6.15 6.15 6.15 6.15 6.15 6.15 6.15 6.15 6.15 6.15 6.15 6.15 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.15 ±0.15 ±0.15 ±0.15 ±0.15 ±0.15 ±0.15 ±0.15 ±0.15 ±0.15 ±0.15 ±0.15 Inches Millimeters Nominal ToleranceTolerance (Inches) Product Standard Thickness Dielectric Constant TC350 Master Sheet Size** 36” x 48” TC600 Master Sheet Size** 36” x 48” 0.127 0.254 0.381 0.508 0.635 0.762 1.016 1.270 1.524 2.286 2.540 3.048 3.175 6.350 0.254 0.381 0.508 0.635 0.162 0.889 1.016 1.270 1.524 2.286 3.175 6.350 ±0.0005 ±0.0007 ±0.001 ±0.0015 ±0.002 ±0.002 ±0.003 ±0.003 ±0.003 ±0.004 ±0.005 ±0.008 ±0.008 ±0.012 ±0.0007 ±0.001 ±0.001 ±0.0015 ±0.002 ±0.002 ±0.002 ±0.002 ±0.003 ±0.004 ±0.004 ±0.008 0.005 0.010 0.015 0.020 0.025 0.030 0.040 0.050 0.060 0.090 0.100 0.120 0.125 0.250 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.050 0.060 0.090 0.125 0.250 TC Series TC350 and TC600 offer “Best-In-Class” Thermal Conductivity and Dielectric Constant Stability with Temperature leading to excellent impedance control and electrical phase stability. Excellent thermomechanical (CTE) stability for highly reliability plated thru holes and component attachment. AD “C” Series Enhanced next generation products of AD “A” Series in terms of cost, mechanical and electrical performances, such as lower loss tangent, lower thermal expansion (CTE) and lower TCEr (for better phase stability), and improved passive intermodulation (PIM) performance. *Master Sheet Sizes are not available on all products or thicknesses. Tolerances are subject to change and custom tolerances may be available.Please contact Arlon Customer Service with questions about material availability. **Master Sheet Size of 48” x 54” , other DK, thickness options available. Tolerances are subject to change and custom tolerances may be available. Please contact Arlon Customer Service with questions about material availability. 6 2.50 2.50 2.50 2.50 2.55 2.55 2.55 2.55 2.55 2.55 2.60 2.60 2.60 2.60 3.00 3.00 3.00 3.00 3.00 3.00 3.00 3.20 3.20 3.20 3.20 3.20 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.04 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 Inches Millimeters Nominal ToleranceTolerance (Inches) Product** Standard Thickness Dielectric Constant AD255A (AD255C provides lower cost and better performance) AD250A AD300A (AD300C provides lower cost and better performance) AD320A AD260A AD350A 0.762 1.524 2.032 6.350 0.762 0.787 1.016 1.524 1.575 2.032 1.016 1.524 2.286 3.175 0.508 0.762 1.016 1.524 2.286 3.048 3.175 0.762 1.016 1.143 1.575 3.175 0.508 0.762 1.016 1.524 2.286 3.048 3.175 5.080 ±0.002 ±0.003 ±0.004 ±0.012 ±0.002 ±0.003 ±0.003 ±0.003 ±0.003 ±0.003 ±0.002 ±0.002 ±0.003 ±0.006 ±0.002 ±0.002 ±0.002 ±0.002 ±0.005 ±0.006 ±0.006 ±0.002 ±0.002 ±0.003 ±0.003 ±0.006 ±0.015 ±0.002 ±0.003 ±0.003 ±0.004 ±0.008 ±0.008 ±0.012 0.030 0.060 0.080 0.250 0.030 0.031 0.040 0.060 0.062 0.080 0.040 0.060 0.090 0.125 0.020 0.030 0.040 0.060 0.090 0.120 0.125 0.030 0.040 0.045 0.062 0.125 0.020 0.030 0.040 0.060 0.090 0.120 0.125 0.200 AD “A” Series Advancements and improvements to the original AD Series, low cost commercial laminates. Lower loss tangent, tighter dielectric and thickness tolerances, and PIM+ design offerings. ** Master Sheet Size of 36” x 48” is standard. Other DK or thickness options available. Tolerances are subject to change and custom tolerances may be available. Please contact Arlon Customer Service with questions about material availability. 7 4.10 4.10 4.10 4.10 4.06 4.10 4.30 4.23 4.50 4.50 4.50 4.50 4.50 4.50 4.50 4.50 4.50 4.50 4.50 4.50 6.15 6.15 6.15 6.15 6.15 6.15 7.80 9.10 9.70 10.0 10.2 10.35 10.6 10.7 10.9 10.2 10.2 10.2 ±0.12 ±0.12 ±0.12 ±0.12 ±0.06 ±0.12 ±0.06 ±0.06 ±0.25 ±0.25 ±0.25 ±0.25 ±0.25 ±0.25 ±0.25 ±0.25 ±0.25 ±0.25 ±0.25 ±0.06 ±0.40 ±0.40 ±0.40, ±0.15 ±0.40 ±0.40 ±0.15 ±0.35 ±0.35, ±0.25 ±0.35, ±0.25 ±0.35, ±0.25 ±0.35, ±0.25 ±0.35 ±0.35, ±0.25 ±0.35 ±0.35 ±0.35 ±0.35 ±0.35 Inches Millimeters Nominal ToleranceTolerance (Inches) Product** Standard Thickness Dielectric Constant AD430 AD410 AD450A AD600 AD600A AD450 AD1000 AD1000X 0.762 1.575 1.905 3.048 3.075 6.350 0.762 3.175 0.254 0.508 0.762 1.016 1.270 1.524 1.778 2.286 4.572 5.080 5.842 3.048 0.254 0.508 0.787 1.575 2.286 6.350 0.152 0.267 0.381 0.508 0.635 0.762 1.270 1.499 3.226 1.270 2.489 3.175 ±0.002 ±0.003 ±0.004 ±0.006 ±0.006 ±0.008 ±0.002 ±0.006 ±0.001 ±0.0015 ±0.002 ±0.003 ±0.003 ±0.003 ±0.004 ±0.005 ±0.009 ±0.010 ±0.010 ±0.006 ±0.001 ±0.0015 ±0.002 ±0.003 ±0.005 ±0.012 ±0.0005 ±0.001 ±0.0015 ±0.002 ±0.002 ±0.002 ±0.002 ±0.003 ±0.006 ±0.002 ±0.005 ±0.006 0.030 0.062 0.075 0.120 0.125 0.250 0.030 0.125 0.010 0.020 0.030 0.040 0.050 0.060 0.070 0.090 0.180 0.200 0.230 0.120 0.010 0.020 0.031 0.062 0.090 0.250 0.006 0.0105 0.015 0.020 0.025 0.030 0.050 0.059 0.127 0.050 0.098 0.125 High Dielectric Constant For Circuit Miniaturization & High Gain Patch Antenna Applications. Excellent for applications requiring low loss, a higher dielectric constant, as well as mechanical robustness capable of handling stress, vibration or drop tests. Much more durable than either Alumina or Ceramic loaded Hydrocarbons. **Master Sheet Size of 36” x 48” is standard. Other thicknesses available. Tolerances are subject to change and custom tolerances may be available. Please contact Arlon Customer Service with questions about material availability. 8 2.50 2.50 2.50 2.50 2.50 2.50 2.50 2.55 2.55 2.55 2.55 2.55 2.55 2.55 2.55 2.55 2.55 2.70 2.70 2.70 2.70 2.70 2.70 3.20 3.20 3.20 3.20 3.20 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.05 ±0.10 ±0.10 ±0.10 ±0.10 ±0.10 Inches Millimeters Nominal ToleranceTolerance (Inches) Product** Standard Thickness Dielectric Constant AD250 AD270 AD255 (check options wi