eccosorb?mf lossy, magnetically loaded, machinable stock americas: +1.866.928.8181 europe: +49.(0)8031.2460.0 asia: +86.755.2714.1166 www.lairdtech.com lossy, magnetically loaded, machinable stock eccosorb mf is a series of rigid magnetically loade d epoxy stock, which can be machined for use as absorbers, attenuators and terminations in w aveguides, coaxial or stripline applications. with products such as these, it is ne cessary to be conversant with the dielectric and magnetic properties of the materials, which are listed in this technical bulletin, the values given are normalized with respect to free sp ace, see typical electrical properties table. features and benefits ? rigid ? machinable markets ? commercial telecom ? security and defense specifications typical properties eccosorb mf frequency range >1 ghz service temperature c (f) <180 (<356) density g/cc 1.6 C 4.9 hardness, shore d 85 tensile strength (mpa) 55 thermal expansion per c ~30 x 10 - 6 water absorption, % 24 hours <0.3 thermal conductivity w/mk 1.44 data for design engineer guidance only. observe d performance varies in application. engineers are reminded to test the material in application. applications ? eccosorb mf is widely used as absorbers, attenuator s, and terminations in waveguides and coaxial lines. ? it has also been successfully used as a high-q indu ctor-core material in such devices as slug tuners. it is also useful in many other magnet ic components. ? simple rf filters can be formed by passing filament leads through small blocks of eccosorb mf, or by casting appropriate sections of the mater ial around such leads by using one of the electrically equivalent castable absorbers. ? there are also applications in antenna elements and in certain free-space absorbers. for assistance in termination design, see terminati on design considerations.
eccosorb?mf 2 rfp-ds-mf 092115 a ny information furnished by laird technologies, inc . and its agents is believed to be accurate and rel iable. all specifications are subject to change wit hout notice. responsibility for the use and applica tion of laird technologies materials rests with the end user. laird technologies makes no warranties as to the fitness, merchantability, suitability or no n- infringement of any laird technologies materials or products for any specific or general uses. lair d technologies shall not be liable for incidental o r consequential damages of any kind. all laird techno logies products are sold pursuant to the laird tech nologies terms and conditions of sale in effect fr om time to time, a copy of which will be furnished upon request. ? copyright 2015 laird technologies, inc. all rights reserved. laird, lair d technologies, the laird technologies logo, and ot her marks are trademarks or registered trademarks o f laird technologies, inc. or an affiliate company thereof. other product or service names may be the property of third parties. nothing herein provi des a license under any laird technologies or any t hird party intellectual property rights. availability ? eccosorb mf is available in the following standard stock sizes : ? sheets 30.5 cm x 30.5 cm (12 x 12) in thicknesse s of 0.32, 0.64, 0.95, 1.27, 1.59, 1.91, 2.54, 3.81, 5.08, 6.35, 7.62 cm (1/8, 1/4, 3/8, 1/2 , 5/8, 3/4, 1.0, 1.5, 2.0, 2.5 & 3.0). ? rods 30.5 cm long (12) in diameters of 0.32, 0.64 , 0.95, 1.27, 1.59, 1.91, 2.54, 3.81, 5.08, 6.35, 7.62 cm. (1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 1.0, 1.5, 2.0, 2.5 & 3.0 ) ? bars 30.5 cm long (12) in squares of 0.64, 0.95, 1 .27, 1.59, 1.91, 2.54, 3.81, 5.08 cm (1/4, 3/8, 1/2, 5/8, 3/4, 1.0, 1.5 & 2.0). ? other sizes, shapes, thicknesses, and configuration s are available on special order. ? in some cases, depending on which eccosorb mf serie s is being used, casting of certain configurations can be done during manufacturing as shown below. instructions for use termination design considerations : ? the most widely used member of the eccosorb mf seri es is mf-117. it is an excellent material to start experimentation. most designs of terminating and attenuating elements depend heavily upon cut-and-try procedures. a prel iminary design is established by experience or rough estimates of probably satisfact ory dimensions, a piece of eccosorb mf is machined and tested for vswr and/or attenuati on and the design is then modified as required. ? in coaxial, waveguide and strip-line terminations, either step-tapered or uniformly tapered configurations can be used. ? step-tapered terminations are narrow-banded and hig hly critical dimensionally. they are recommended only where essentially single frequency operation is anticipated. increasing the number of steps beyond two can increase the usa ble band-width and such designs are helpful when limited length is available in the dir ection of propagation. reproducibility of the performance of step-tapered terminations may be difficult because of their sensitivity to small changes in magnetic and dielectric propert ies. ? uniformly tapered terminations are generally prefer red because of the low vswr which is possible to achieve over a wide frequency range. d imensions are reasonably non-critical and performance is reasonably insensitive to magnet ic and dielectric properties. in general, the more gradual the taper, the lower the vswr. a length-to-base-width ratio of 10:1 is highly desirable for vswr as low as 1.01 ov er a full waveguide frequency band, particularly with materials having the higher value s of m' and k'. a sufficiently long taper must be used so that very little energy reaches the base mounting plate where it can be reflected back into the line. the one-way attenuat ion should be at least 25 db for vswr as low as 1.01. ? wall-type uniform tapers offer maximum heat-transfe r efficiency and are recommended for high-power applications. related products ? for higher temperature applications up to 260 c, r efer to the electrical equivalent eccosorb? mf500f.
eccosorb?mf 3 rfp-ds-mf 092115 a ny information furnished by laird technologies, inc . and its agents is believed to be accurate and rel iable. all specifications are subject to change wit hout notice. responsibility for the use and applica tion of laird technologies materials rests with the end user. laird technologies makes no warranties as to the fitness, merchantability, suitability or no n- infringement of any laird technologies materials or products for any specific or general uses. lair d technologies shall not be liable for incidental o r consequential damages of any kind. all laird techno logies products are sold pursuant to the laird tech nologies terms and conditions of sale in effect fr om time to time, a copy of which will be furnished upon request. ? copyright 2015 laird technologies, inc. all rights reserved. laird, lair d technologies, the laird technologies logo, and ot her marks are trademarks or registered trademarks o f laird technologies, inc. or an affiliate company thereof. other product or service names may be the property of third parties. nothing herein provi des a license under any laird technologies or any t hird party intellectual property rights. typical electrical properties e-m properties of eccosorb mf frequency hz frequency ghz 102 10 3 10 4 10 5 10 6 10 7 10 8 1.0 3.0 8.6 10.0 18.0 MF-110 k tan d k m tan m m db/cm |z|/z 0 18 0.01 0.18 1.2 0 0 0 0.26 16 0.01 0.16 1.2 0 0 0 0.27 15 0.02 0.30 1.2 0 0 0 0.28 13 0.02 0.26 1.2 0 0 0 0.30 11 0.03 0.33 1.2 0 0 0 0.33 9.0 0.03 0.27 1.2 0 0 0 0.37 7.0 0.04 0.28 1.1 0 0 0.01 0.40 5.0 0.04 0.20 1.1 0 0 0.09 0.47 3.2 0.05 0.16 1.1 0 0 0.26 0.59 3.0 0.05 0.15 1.0 0.10 0.10 2.0 0.59 2.9 0.04 0.12 1.0 0.10 0.10 2.2 0.59 2.8 0.04 0.11 1.0 0.20 0.20 6.6 0.60 mf-112 k tan d k m tan m m db/cm |z|/z 0 20 0.02 0.40 2.0 0 0 0 0.32 18 0.02 0.36 1.9 0 0 0 0.32 16 0.03 0.48 1.8 0 0 0 0.34 14 0.03 0.42 1.7 0 0 0 0.35 12 0.03 0.36 1.6 0 0 0 0.37 10 0.04 0.40 1.5 0 0 0 0.39 8 0.04 0.32 1.5 0.01 0.02 0.02 0.43 6 0.04 0.24 1.4 0.02 0.03 0.16 0.48 5.2 0.05 0.26 1.4 0.03 0.04 0.59 0.52 5.0 0.05 0.25 1.1 0.22 0.24 4.9 0.47 4.8 0.04 0.19 1.1 0.23 0.25 5.6 0.48 4.6 0.03 0.14 1.0 0.26 0.26 10.1 0.47 mf-114 k tan d k m tan m m db/cm |z|/z 0 22 0.04 0.88 2.8 0 0 0 0.36 21 0.04 0.84 2.8 0 0 0 0.37 19 0.04 0.76 2.7 0 0 0 0.38 18 0.05 0.72 2.6 0 0 0 0.38 16 0.05 0.80 2.5 0 0 0 0.40 14 0.05 0.70 2.4 0 0 0 0.41 12 0.05 0.60 2.3 0.04 0.09 0.04 0.44 11 0.05 0.55 2.1 0.08 0.17 0.57 0.57 9.9 0.06 0.59 1.9 0.13 0.25 2.2 0.44 9.8 0.06 0.59 1.3 0.33 0.43 10.8 0.37 9.7 0.05 0.49 1.1 0.40 0.44 13.2 0.35 9.6 0.05 0.48 1.0 0.45 0.45 24.9 0.34 mf-116 k tan d k m tan m m db/cm |z|/z 0 40 0.06 2.4 4.6 0 0 0 0.34 35 0.06 2.1 4.5 0 0 0 0.36 30 0.07 2.1 4.4 0 0 0 0.38 26 0.07 1.8 4.4 0 0 0 0.41 23 0.08 1.8 4.3 0 0 0 0.43 20 0.09 1.8 4.2 0 0 0 0.46 18 0.08 1.4 4.0 0.04 0.16 0.09 0.47 17 0.07 1.2 3.0 0.13 0.39 1.3 0.42 16.5 0.06 0.99 2.8 0.21 0.59 5.0 0.42 16.2 0.07 1.1 1.6 0.47 0.75 21 0.33 16.0 0.06 0.96 1.5 0.68 1.02 32 0.33 15.8 0.05 0.79 1.4 0.73 1.02 57 0.33 mf-117 k tan d k m tan m m db/cm |z|/z 0 195 0.18 35 5.0 0 0 0 0.16 158 0.21 33 5.0 0 0 0 0.18 120 0.23 28 5.0 0 0 0 0.20 85 0.24 20 5.0 0 0 0 0.24 62 0.22 14 5.0 0 0 0 0.28 48 0.18 8.6 5.0 0 0 0.03 0.32 38 0.12 4.6 4.8 0.1 0.48 0.27 0.36 28 0.09 2.5 4.1 0.20 0.82 2.8 0.39 22.9 0.06 1.4 3.4 0.39 1.33 11.0 0.40 21.4 0.02 0.42 1.2 1.36 1.63 46 0.30 21 0.02 0.42 1.1 1.5 1.7 56 0.31 20.6 0.02 0.41 1.0 2.00 2.00 119 0.33 mf-124 k tan d k m tan m m db/cm |z|/z 0 260 0.40 104 7.0 0 0 0 0.16 205 0.39 80 6.9 0 0 0 0.18 145 0.36 52 6.8 0 0 0 0.21 95 0.31 29 6.7 0 0 0 0.26 70 0.26 18 6.6 0 0 0 0.30 52 0.20 10 6.3 0 0 0.03 0.34 40 0.14 5.6 6.0 0.2 1.2 0.48 0.39 32 0.08 2.6 5.0 0.45 2.3 6.5 0.42 25.8 0.07 1.8 3.8 0.69 2.62 20 0.42 23.8 0.05 1.19 2.50 1.10 2.75 63 0.39 23.6 0.03 0.71 1.5 1.4 2.1 67 0.33 23.0 0.04 0.92 1.0 2.5 2.5 149 0.34 mf-175 k tan d k m tan m m db/cm |z|/z 0 320 0.50 160 8.0 0 0 0 0.15 250 0.49 123 7.9 0 0 0 0.17 170 0.46 78 7.8 0 0 0 0.20 105 0.41 43 7.7 0 0 0 0.26 78 0.36 28 7.6 0 0 0.01 0.30 56 0.26 15 7.3 0 0 0.05 0.36 42 0.16 6.7 7.0 0.4 2.8 0.87 0.42 36 0.06 2.2 6.0 0.6 3.6 8.6 0.44 27.0 0.05 1.35 4.4 0.8 3.52 24 0.46 25.0 0.03 0.75 1.80 1.40 2.5 65 0.35 24.0 0.02 0.48 1.3 1.6 2.1 69 0.32 24.0 0.02 0.48 1.1 3.0 3.3 177 0.38 mf-190 k tan d k m tan m m db/cm |z|/z 0 380 0.60 228 9.0 0 0 0 0.14 295 0.59 174 8.9 0 0 0 0.16 195 0.56 109 8.8 0 0 0 0.20 115 0.51 59 8.7 0 0 0 0.26 86 0.46 40 8.6 0 0 0.01 0.30 60 0.32 19 8.3 0 0 0.06 0.36 44 0.18 7.9 8.0 0.6 4.0 1.3 0.46 40 0.07 2.8 7.0 0.8 5.6 12.6 0.47 28.0 0.04 1.12 4.5 0.9 4.05 27 0.47 26.0 0.04 1.04 2.0 1.40 2.8 70 0.36 25.0 0.02 0.50 1.5 1.6 2.4 75 0.34 25.0 0.02 0.50 1.1 4.0 4.4 217 0.43
eccosorb?mf 4 rfp-ds-mf 092115 a ny information furnished by laird technologies, inc . and its agents is believed to be accurate and rel iable. all specifications are subject to change wit hout notice. responsibility for the use and applica tion of laird technologies materials rests with the end user. laird technologies makes no warranties as to the fitness, merchantability, suitability or no n- infringement of any laird technologies materials or products for any specific or general uses. lair d technologies shall not be liable for incidental o r consequential damages of any kind. all laird techno logies products are sold pursuant to the laird tech nologies terms and conditions of sale in effect fr om time to time, a copy of which will be furnished upon request. ? copyright 2015 laird technologies, inc. all rights reserved. laird, lair d technologies, the laird technologies logo, and ot her marks are trademarks or registered trademarks o f laird technologies, inc. or an affiliate company thereof. other product or service names may be the property of third parties. nothing herein provi des a license under any laird technologies or any t hird party intellectual property rights. legend k' real part of the permittivity (dielectric constant) tan d dielectric loss tangent k imaginary part of the permittivity (loss) m' real part of the magnetic permeability tan m magnetic loss tangent m imaginary part of the magnetic permeability (loss) db/cm attenuation per unit distance db/in attenuation per unit distance lzl/z 0 normalized impedance magnitude ratio most of the definitions and equations are included in the laird publication : energy propagation in dielectric and magnetic materials . a copy of this publication can be requested. in this technical bulletin, ' is used for the real part of the magnetic permeability and for the m agnetic loss factor. beyond the definitions in the publication above, the clarification of the ter ms db/cm (attenuation) and |z|/zo (relative impedan ce) are offered. these characteristics are not in themselves directl y applicable to the calculation of transmission and reflection coefficients as they are defined on point 3 & 4 of energy propagation in dielectric and magnetic material. for these calculations, th e complex dielectric constant (k'-jk' tan d ) and complex magnetic permeability (m'-jm' tan m ) are used as listed in the table. the definition of db/unit length is included in the reference, both in mathematical form and in words. the value is useful in comparing one material against another to determine which offers the most loss independent of interface reflection c oefficients. similarly, |z|/zo, the normalized impedance magnitude ratio, can be used a s a qualitative measure of the impedance match betw een free space and the material. an impedance ratio that is closest to 1 is the most de sirable because at that ratio, the impedance match between the material and free space is perfect. the significant features of the property tables are : 1. in every case, k' decreases with increasing freq uency. 2 almost without exception, the dielectric loss tan gent and dielectric loss factor decrease with incre asing frequency, the exception occurs at the low end of the frequency band, and can be ignored i n most applications. 3.the magnetic loading increases from a minimum in MF-110 to a maximum in mf-190. there is a correspon ding increase in k', k, ', tan m and . 4.the 0 values in the table indicate that the numbe r is less than 0.01. 5.the values given in the table are nominal values and should not be used by customers in the writing of procurement specifications. if specifications are needed, the customer should c onsult with the laird sales department. the use of dielectric/magnetic properties for quali ty control, i.e., incoming or outgoing inspection, is not recommended, because the measurement of these properties is very time consum ing and complicated. it is recommended to monitor the density.
eccosorb?mf 5 rfp-ds-mf 092115 a ny information furnished by laird technologies, inc . and its agents is believed to be accurate and rel iable. all specifications are subject to change wit hout notice. responsibility for the use and applica tion of laird technologies materials rests with the end user. laird technologies makes no warranties as to the fitness, merchantability, suitability or no n- infringement of any laird technologies materials or products for any specific or general uses. lair d technologies shall not be liable for incidental o r consequential damages of any kind. all laird techno logies products are sold pursuant to the laird tech nologies terms and conditions of sale in effect fr om time to time, a copy of which will be furnished upon request. ? copyright 2015 laird technologies, inc. all rights reserved. laird, lair d technologies, the laird technologies logo, and ot her marks are trademarks or registered trademarks o f laird technologies, inc. or an affiliate company thereof. other product or service names may be the property of third parties. nothing herein provi des a license under any laird technologies or any t hird party intellectual property rights. machining recommendations most of the discussion below applies not only to th e basic eccosorb mf series of materials, but also t o several high temperatures, castable and molding-powder equivalents. eccosorb mf can be form ed readily to close tolerances with standard metal- working machine tools, i.e.: lathes, milling machines, drills, saws, grinders, generally using conventional techniques but observing the pr ecautions and limitations described below. tooling : ? for turning, milling, drilling and tapping, carbid e tools should be used, for example type 883, a gen eral purpose carbide that works well under most conditions. use solid carbide taps for long life. standard size tap drills should be satisfactory. ? external threads are formed best, not with conventi onal thread-cutting dies but by lathe turning or gr inding, with light feeds and shallow cuts. ? sawing can be done with best finish and tolerance u sing circular saws, 20.3 to 25.4 cm diameter, with grinding coolant and high rpm. thin carborandum wheels, 0,079 cm thick or carbide saws may be used where requirements are less string ent. best results are attained by moving the saw and keeping work station ary, with saw rotating so it tends to climb into th e work. ? surface finishing of flat sheets, etc. is best per formed with a blanchard grinder. eccosorb mf is he ld readily with magnetic chucks. sheet size is limited by the size of the machine. coolants : ? use of a coolant liquid is recommended, especially for all close tolerance operations. commercial grin ding fluid is preferred, or water- soluble oil, with rust-resisting properties to prot ect the machines. spark producing operations in par ticular must not be run dry, since smoldering fires might result. ? where coolant run-off is collected for recirculatio n, a two-cavity recovery system should be used to m inimize pick-up of grinding dust, sawdust or chips by the coolant pump. where a re-c irculating system is not available, best results wi ll be obtained with air-powered spray or mist equipment. use of tapped metal inserts should be considered wh ere electrical performance will not be degraded. i nserts may be cast in place, or bonded with castable material of suitable composition. suggested speeds and feed rates the following speeds and feed rates are suggested t o be modified as necessary to suit job conditions: operation speed feed sawing, turning 21.3 - 27.4 m/min (70-90 ft/min) 0.13 - 0.20 mm .005-.008 in/revolution external threading 21.3 - 27.4 m/min 70-90 ft/minute 0.038 mm/pass .001 in/pass tapping 450 rpm tapping head milling 21.3 - 27.4 m/min. 70-90 ft/min 0.038 - 0.076 mm/tooth .0015-.003 in/tooth
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