0014-. Permeability (electromagnetism) In electromagnetism, permeability is the measure of magnetization produced in a material in response to an applied magnetic field. Variation in loss tangent of rFe 2 O 3 –PTFE nanocomposites. 4 times higher dielectric loss tangent and effective relative dielectric permeability compared to unmodified. 6 Thermal stability of AlN/PTFE composites. 9. In all materials, the loss tangent tanδ = ε″/ε′ was between 0. 4 %PTFE also has a very low loss tangent with a typical value of tan δ = 4 × 10 −4 , which decreases by a factor of 2-3 from 300 K down to 4 K [51, 52]. It can be seen that PTFE–Mg 2 SiO 4 nanocomposites shows higher loss tangent as compared to corresponding microcomposites. Dissipation Factor is a dimensionless measure and hence no units. The average insertion loss for CPW lines at 40GHz. Comparing the two kinds of results of the PTFE sample shown in figure 4(A), we see that the biggest difference of the dielectric constant is 0. , 44 (2018), pp. 005 for 40 vol. 2. Under these conditions the loss tangent of fully saturated wood. 8" L=8. Besides dielectric constant, α-PVDF also shows a larger dielectric loss than β-PVDF and γ-PVDF at low frequency (ranging from 100 Hz to 1 kHz). Alternative material systems use PTFE-based laminates and bondply materials to bond a PTFE layer with the next layer in your PCB stackup. Morphology and filler distribution of the composites were studied using scanning electron microscopic technique. 20° indicating a highly crystalline form of pure AgNO 3 and several other low-intensity salt peaks at 19. 0015 0. The first column on the left sums-up the basic data of virgin PTFE G400, in order to compare with the values of the. 5. 6 to 1. , the patch is treated as a wide piece of a microstrip line. 1), extremely low loss tangent (tg δ = 10 −4 at 1 GHz), corrosion resistance, excellent chemical resistance, and is stable in a wide range of frequencies [8], which make it a. The use of composite engineering to tailor structural composite materials for damping results in enhancement of the loss tangent, with negligible, if any, reduction of the storage modulus. Polymeric thin films have low loss tangent values, therefore contributing less dielectric loss at high frequencies. 09 (TDS); whereas the loss tangent angles are ~7. PTFE), which is commonly used as a dielectric, has a loss tangent of 0. For the same outer diameter, cables using PTFE (Teflon™) exhibit a lower loss of signal than those using solid PTFE. 4" L=10. 2 Properties under long-term stress 36 3. When δ is low valued then it is related to loss tangent (the ratio of imaginary and real parts of permittivity) by δ ≈ tanδ ×103 milliradians. 07 and 0. 100 ±0. 83 × 10 −3 and ~3. Therefore, PEEK/PTFE-5 had much higher dielectric loss than that of PEEK-PFN-5 with the same fluorine content. 1). 3) tan δ = ε ″ ε ″ The dielectric constant ( ε ′) represents a measure of the ability of a material to be polarized by an external electric field. It is the ratio of the conduction current to the displacement current. 5% transmittance at these Fabry-Pérot resonance frequencies [34], due to. 05 (CW) to 2. 5 × 10 −4, 3 GHz). 5 S/m. 038 87Dissipation factor is the tangent of the loss angle of the insulating material. In addition, the PTFE/F-GF composite shows improved density (2. Polytetrafluoroethylene (PTFE), a strong, tough, waxy, nonflammable synthetic resin produced by the polymerization of tetrafluoroethylene. , 95 (2009), Article. Resonac believes these properties are greatly affected by the difference in scattering loss. The radome material choice, such as fiberglass, PTFE-coated fabric, and polycarbonate, is generally dependent on the targeted application environmental use. ThunderClad 3+ laminates also exhibit excellent moisture resistance, improved CTE, superior. 3. Most microwave materials have dielectric constant between 2. As shown in Fig. 2 (PTFE) and 9. Dielectric PTFE 0. 85*10-12 F/m), ε 0 - dielectric constant of silicon (11. Electrical strength. Polytetrafluoroethylene PTFE - 2. Unlike PTFE based high performance materials, RO4000 series laminates do not require specialized via preparation processes such as sodium etch. Center Conductor: 0. 00022. Where tan δ is the dielectric loss factor of the substrate and f is frequency. Copolymers of tetrafluoroethylene and hexafluoropropylene showed two dielectric loss peaks: one. Atomic Force Microscopy (AFM) is no longer used as a nanotechnology tool responsible for topography imaging. 2. PTFE also has a very low loss tangent with a typical value of tan δ = 4 × 10 −4 , which decreases by a factor of 2-3 from 300 K down to 4 K [51, 52]. The dielectric loss of the molded resin after heat treatment is only 0. Sometimes the term “quality factor or Q-factor” is used with respect to an electronic microwave material, which is the reciprocal of the loss tangent. , the maximum dielectric loss tangent is 0. 3E-4 @3. Your core is effectively one or more prepreg laminates that are pressed, hardened, and cured with heat, and the core is plated with copper foil on each side. 1. In an ideal capacitor without any dielectric losses, the insulation current is exactly 90° leading according to the applied voltage. 04; Low thermal coefficient of Dk at 12 ppm/°C; Dissipation factor of. Loss tangent (tanδ) or dissipation factor (Df): The loss tangent or dissipation factor is the tangent of the phase angle between the resistive and reactive currents in the dielectric. 0003, and its service temperature is relatively also high (~250±1°C) [10, 11]. Among these polymers, polytetrafluoroethylene (PTFE) has caused concern of the industry and academia, due to its excellent dielectric properties such as low permittivity, extremely low loss tangent [1, [5], [6], [7]]. Dielectric Loss and Copper Loss . The permittivity and loss tangent of the blends up to 40 MHz are studied using a Precision. Here, we use tan δ = 2 × 10 −4 at 4 K. 05 (CW) to 2. Rigid PCB Copper Clad Laminate is also known as PCB laminate is a kind of substrate material used in PCBs containing a tiny layer of copper lamination on any side (single CCL) or both sides (double CCL) of the PCB. 60, low electrical loss of tan δ from 0. 1 Understanding Dielectric Constant and Loss tangent on Radome and Antenna Design Loss Tangent =. 25 at 1 GHz and 4. Figure 2 shows the relationship between the dissipation factor vs. 009: BETTER Dielectric Constant 3. 059 and 0. It can be said that RO4350B achieves the. of soft and hard magnetic alloys. Fig. The PTFE/PVDF coating (containing 20 wt% of PTFE) exhibits synergistic effect with high water contact angle (CA, 153. Published in: 2006 International Conference on Microwaves, Radar & Wireless CommunicationsFigure 6. This is first, because the low dissipation factor of the dielectric itself reduces attenuation, especially at higher frequencies, and second the low dielectric constant of a microporous dielectric allows the use of a larger. 00 10 3 at 10 kHz. 9 (alumina), because so many materials are engineered by mixing these two materials. And the spherical particles are advantageous to increase the ceramic volume fraction [2]. The effect of loss tangent. 1, we see loss tangent can equivalently be calculated as. order to design a product with the advantages of low loss tangent and suitability for sequential lamination. 25 vf micro Sm2Si2O7 composites showed a relative permittivity and dielectric loss of 3. Fig. View PDF View article View in Scopus Google. The reason for increasing loss tangent with filler loading is attributed to the relatively high loss tangent of the particulate filler compared to that of the PTFE matrix. , Ltd. The radome material choice, such as fiberglass, PTFE-coated fabric, and polycarbonate, is generally dependent on the targeted application environmental use. Appl. One of the efforts to control the CTE of PTFE. ECCOSTOCK FFP is a powder curing into a rigid foam, perfect to fill cavities. For example, teflon (a. 1 Understanding Dielectric Constant and Loss tangent on Radome and Antenna DesignIn addition, I-Tera MT40 offers a lower dissipation factor (Df) of 0. 0015 0. Nafion is known as the standard material among different materials utilized for PEM [39]. 37 shows an idealized radome. 4 (a), the slope of G′ curves was increased which indicated the transition from liquid-like to solid-like in viscoelastic behavior. 5 GHz at room temperature and also for temperatures varying from –30°C to 25°C at a frequency of 3. To achieve polytetrafluoroethylene (PTFE)-based composites for high-frequency applications with low dielectric constant, low dielectric loss tangent and low coefficient of thermal expansion (CTE), a novel pentafluorostyrene (PFS) interface modifier was used to achieve excellent performance for SiO 2 /PTFE composite materials. . View Article. 4 a–b. The density, dielectric constant, loss tangent, moisture absorption and ultimate tensile strength of the composite systems under study are complied in Table 1. 003 or less at ~10 GHz or higher; Fiber weave effects, although these laminates may have the same loss tangent as typical FR4 materials;. 33 x 10 7: MΩ-cm. 3 and 0. The mass loss of 10. RO4350B™ Laminates. BNT/PTFE. 0003 which is stable over a wide range of frequencies [5]. Polytetrafluoroethylene (PTFE) refers to the synthetic fluoropolymer derived from tetrafluoroethylene. 7 and a loss tangent of. 1E-4 @3 GHz. 5%) 0. Dielectric constant: Although this is sometimes misunderstood, and everyone tends to just go for low-Dk laminates, but high-Dk. fre- Moisture absorption significantly influences electrical properties of the composite since water has high dielectric constant and loss tangent. 2. 6 to 4. This paper presents a method for reducing dielectric loss (tan δ) by forming PDMS composites loaded with various concentrations of either alumina (Al 2 O 3) or polytetrafluoroethylene (PTFE). In this article, we will explore the key features and benefits of Arlon AD255C, highlighting its impact on enhancing high-frequency circuit performance. Sci. ( CC BY-SA 4. Benefits. (PI), cyanate ester resin (CE), polytetrafluoroethylene resin (PTFE), bismaleimide triazine resin (BT), thermosetting polyphenylene ether resin (PPE) or PPO are all commonly used. 2. Loss tangent can be calculated using the following formula: tanδ=1/(ω*ε v *ε 0 *R), where ω - circular frequency, εv - dielectric constant of vacuum (8. 2. 004–0. Some key advantages of PTFE include: Low dielectric constant and loss tangent: PTFE offers a low dielectric constant and low loss tangent, which results in minimal signal loss and distortion at high frequencies. Discover the world's research 25. Dielectric Loss (see 1. Electromagnetic simulations demonstrate that both the resonant frequency and quality factor of the sensor vary considerably with the dielectric constant and loss tangent of the liquid sample. This paper presents a complete set of experimental data consisting of storage modulus, tan δ, loss modulus, relaxation modulus and creep compliance for these materials under isothermal. CuClad 6250 bonding film is an ethylene-acrylic acid thermoplastic co-polymer recommended for bonding dielectric structures like PTFE/glass where exposure to high temperature or high pressure is not desirable. With excellent mechanical and electrical properties, these materials are reliable for use in multi-layer board constructions. Resonac considers the difference between SFR and LCP as the difference in dielectric loss based on Dk and Df. Loss tangent: '' tan C ' es d e we == (6. Download scientific diagram | (a) Dielectric constant and loss tangent of P(VDF-TrFE-CFE) at 100–1 MHz frequency and À 80 C–110 C temperature, (b) polarization-electric field (D-E) response. Chemical structure of PTFE. Rogers RO4350B materials are proprietary woven glass reinforced hydrocarbon/ceramics with electrical performance close to PTFE/woven glass and the manufacturability of epoxy/ glass. - Suitable for high-frequency electric wires since both the dielectric constant and the dielectric loss tangent are small - Coefficient of friction is so small that it can gain the excellent slipperiness. 3 respectively. The cells were 5. 4". The MEGTRON 7 family, including MEGTRON 7(N), MEGTRON 7(GE) and. The dielectric constant of the presented stack up remains stable around 4. J. The loss tangent for ptfe is about 0. Ca 0. However, the changes of the electrical property (including dielectric constant and loss tangent) are complex and hard to be obtained and analyzed. The effect of loss tangent on properties of dipole antenna was studied for values 0. The dielectric constant and dielectric loss of the CLST/PTFE composites were measured by using a vector network analyzer (Agilent, HP8722ET, America) at 10 GHz. 23 and 0. 1 and a loss tangent<0. . The first column on the left sums-up the basic data of virgin PTFE G400, in order to compare with the values of the. It is possible to create low-cost RF circuit cards on FR-4, but the losses will always be much higher than on PTFE-based boards from reputable suppliers. 0022 (10 GHz) at an optimum filler volume fraction of 46% ZrTi2O6. Successful Design of OC-48/2. Article. PCB cores and laminates are similar and, in some ways, quite different. 5. The scanned data may also be saved on disk. 2 dB with a thickness of 2. 6 THz before decreasing to 0. Another blended polymer prepared from PEEK and PTFE (PEEK/PTFE-5) possessed a dielectric constant of 3. The loss tangent creates. Both twisting and bending lead to structural deformation, namely the density distribution change of the PTFE SCPDW at the bending section, which affects the dielectric constant and loss tangent. The COMSOL Multiphysics® software and many of its add-on modules include built-in material libraries, which are databases with materials and their associated material properties. 5%E shows a slight increase with. 0. 85*10-12 F/m), ε 0 - dielectric. The only way you can reduce it is to use a dielectric with a very low loss tangent, or low dielectric constant. Relative permittivity is also commonly known. Loss tangent values obtained for PTFE–Mg 2 SiO 4 (micro and nano) composites has been plotted in Fig. Products Why Isola Why Isola Materials Quality. Generally, the loss in a material is expressed in terms of the loss tangent, tanδ= ²00r ²0 r. 012 at 1 MHz, respectively. 46 and 2372. These laminates should form the. e. 2E-4 @100 MHz. Specifications Met: ASTM D1710, FDA Compliant 21 CFR 177. PTFE Teflon® Type A L=4. 081 at 100 GHz and 2 THz, respectively. 2. The result is a low loss material which can be fabricated using standard epoxy/glass (FR-4) processes offered at a competitive price. For the extraction of dielectric constant and loss tangent of the proposed stack up, microstrip ring resonator (MRR) method is used. 001 to 0. 20%), with the actual measured value ranging from 2. This type of PCB stackup is suitable for. 4 a–b. 003 at 10GHz. It is a measure of the amount of energy loss from the material due to an external electric field. Read more ArticleLow loss tangent at high frequencies, normally ~0. 05, 0. 0018 while. 5. RO3010™ Laminates. Volume resistivity. Those values increase with frequency to between about 3. 35 40 0. 56 cm long with the internal diameter of 5. In loss tangent AFM, the AFM cantilever is excited, similar to amplitude modulation AFM (also known as tapping mode); however, the observable aspects are used to extract dissipative and conservative energies per cycle of oscillation. Figure 11. PTFE. Materials like PTFE, PE and PS were used to validate the measurement. While sintering first evaporate the binder at 500-600 for 15 min and then go to your desired temperature. The fused amorphous SiO 2 has a dielectric constant of approximately 3. 0010 to 2. If you are not working in the area of RF circuit design, you might have not heard of this term 'Loss Tagent'. 008") Dielectric Diameter: 0. To obtain the permittiv-ity and the loss tangent of the test. Dielectric constant (Dk) of 2. Dielectric Loss =. % untreated SiO 2 filled PTFE composite has a dielectric constant of 2. 4 THz. 1 X-ray diffraction (XRD). 39 mm . 0010 0. The measurement results show that the partially cross-linked sample. 1. In general, the dielectric loss tangent of composites remains a very low level, i. Phys. 6 ppm per °C). Therefore, to low the dielectric loss of the composite, the silane coupling agent F8261, which is similar to PTFE and has a long C–F chain, was chosen as a surface modifier to hydrophobized the GF. How-ever, disadvantages of PTFE substrate include a high linear coefficient of thermal expansion (CTE) and low surface en-ergy. 51, 0. 이 값을 흔히 유전상수(dielectric constant, 誘電常數)라고도 한다. FR1 served simpler radio and pre-war telecommunications applications well. However, the main disadvantage of PTFE is the negative temperature coefficient of dielectric constant (τ ε ∼-400 ppm/°C) making it difficult to be used in microwave circuit devices. 3. I am. and it influences cost of devices. 2: Loss tangent defined in terms of the real and imaginary components of the complex permittivity [Math Processing Error] ϵ c. The dielectric loss tangent of the hBN/PTFE/PDMS composites with (a) no hBN, (b) no PTFE, (c) hBN 40 vol% and (d) PTFE 40 vol% at 18. 0005 0. The changing of dielectric constant (εr) and loss tangent (tanδ) were similar to that of the moisture absorption in a manner. Good Dielectric (low-loss dielectric) = j Loss Tangent Loss Tangent E E Loss Tangent is often used to determine how lossy a medium is at a particular frequency. 3E-4 @100 MHz. Try to keep a slow heating rate to avoid pore formation. For example, loss tangent of HRFZ-Si with resistivity 10 kOhm*cm at 1 THz is 1. CuClad® laminates are woven fiberglass/PTFE composite materials for use as printed circuit board substrates. The. 4. 1) Ultra Low Loss Tangent & Dissipation Factor Since the dielectric in CuFlon is pure PTFE, the losses are lower than those encountered in PTFE/glass materials. Step 2: Select the membrane and housing material for your application. 5 THz to a maximum value of 0. In normal radar operation, an attenuation of 12 dB will halve the maximum detection distance. Effect of membrane wetting on the performance of PVDF and PTFE membranes in the concentration of pomegranate juice through osmotic distillation. 0210 IPC-4101 /98 /99 /101 /126 UL - File E41625 Grade PCL-FR-370HR 370HR is the industry's “best in class” lead-free compatible product for high-reliability applications across a wide range of markets. The loss tangent is a. In fact, IDTechEx's benchmarking studies. 2 Radome Design Elements. Polyetheretherketone is ahigh performance thermoplastic that is strong, stiff, hard and has high temperature resistance. PTFE melts at 327°C and retains its useful. 2021, 11, x FOR PEER REVIEW 7 of 9 . 2. Where relevant, this includes physical properties, thermal properties, B-H curves, core loss data, frequency dependent permittivity and frequency-dependent loss tangent – enabling more exact analysis for key classes of electromagnetic simulation. 7–5. 0 ()1. 진공의 유전율. The values from the associated chart are obtained by the analysis of both the moulding and extrusion process. f = 10 Hz corresponds to ω = 62. In order to go high temperature. 8 cm, but the columns were 25 cm long with the same internal diameter. The more common compounded PTFE grades are filled with glass fibre, bronze, graphite, carbon. 3. 2021, 11, 6813 7 of 9. Generally, ceramic fillers have suitable dielectric constant, low loss tangent and relatively high thermal conductivity [[9], [10], [11]]. RT/duroid® high frequency circuit materials are filled PTFE (random glass or ceramic) composite laminates for use in high reliability, aerospace and defense applications. The dielectric constant of RT/duroid 5870 and 5880 laminates is uniform from panel to panel and is constant over a. Most plastics have relatively lower dissipation factor at room temperature. 46 and 2372. Environmental Specifications. 2: Loss tangent defined in terms of the real and imaginary components of the complex permittivity [Math Processing Error] ϵ c. Polytetrafluoroethylene exhibited the typical dielectric behavior of a nonpolar substance: no dielectric loss peak was found over the experimental range of temperature and frequency. For example, teflon (a. The fiberglass reinforced TLY-3FF has been engineered to provide the dimensional stability typical of the standard fiberglass reinforcedTo further investigate the impact of the foaming temperature on the dielectric-loss and magnetic-loss capabilities, tangent loss values, tan. Tefzel® can be extruded or injection molded easily, using conventional techniques, and thus presents no unusual operator training. 002 (Lower the loss tangent, the lower will be loss). Comparing the two kinds of results of the PTFE sample shown in figure 4(A), we see that the biggest difference of the dielectric constant is 0. 5 Coefficient of Thermal Expansion 19 15 X ppm/˚C --55˚C to 288˚C IPC TM-650 2. 009: BETTER Dielectric Constant 3. Low loss, low density dielectrics typically range in dielectric constant from 1. An intermediate layer is often. 04 Df 0. 4. 6 for the entire band while loss tangent varies from 0. RO4350B laminates provide tight control on dielectric constant (Dk) and maintain low loss while utilizing the same processing method as. 1), and is widely used in microwave high-frequency composite substrates. 4 plots the storage (G′) and loss (G″) modulus, complex viscosity (η*), and tangent of the phase angle shift (tan δ) against frequency (ω) for PP and its blends, respectively. 0; C. e. c. With their exceptional dielectric properties, low loss tangent, and thermal stability, AD255C materials offer significant advantages for high-frequency circuit designs. It has been reported that 60 wt. Phys. 1 0. This material is a rigid, thermoset laminate. 0003) and stable dielectric constant (ε r = 2. Nonetheless, the challenge to conduct proton from the anode during the increased temperature because of water dissipation appears to be a major drawback for the Nafion [39, 40]. See. 2 (1. 2. The relative dielectric constant (ε r) and loss tangent (tanδ) of the composites. Hence, in this paper, PTFE and spherical CNT were chosen as polymer matrix and ceramic filler, respectively. 5 and above Loss Tangent 0. PTFE is chosen as polymer matrix because of its excellent dielectric properties (low relative permittivity∼2. 15 to 4. 0020 5 15 25 35 45 55 65 Loss Tangent Frequency (GHz) PTFE Teflon® Type A L=4. 95, 062903 (2009) Article Google Scholar Download. However, the application of PTFE was hindered by its high CTE (∼400 ppm/ o C) due to its room temperature phase transformation. BNT/PTFE composites with high dielectric constant and low loss properties were prepared via powder processing technique. Novel high dielectric constant and low loss PTFE/CNT composites. Meanwhile, the dielectric constant and dielectric loss of PTFE/CNT (5 wt%) nanofiber membranes are 58. A surface roughness is very low for PTFE substrate and there is low reliability in Rogers RT/duroid 5880 high frequency laminates are PTFE composites reinforced with glass microfibers. Helping to maintain the Dk uniformity are the randomly oriented microfibers reinforcing the. 2 dB with a thickness of 2. e. 5. Example PTFE PCB from Rayming Circuits. 0009 to 0. 0041. 0) eff. 00155 whereas for nano Sm2Si2O7 composites with same volume fraction the values. Loss Tangent. PTFE 2. BZV-filled HDPE composite shows a εr value of 4. This family of advanced laminates offers exceptional electrical and mechanical stability. The simulations were repeated for three different values of relative permittivity 2. Wang) The discussion in this section has assumed that [Math Processing Error] ϵ c is complex-valued solely due to ohmic loss. The heat conduction of PTFE polymer-based composite substrates has always been a problem because of a low heat conductivity of PTFE itself. Because of the high loss tangent, don't try to make any filter structures! Properties of FR-4. The result is much lower loss at microwave frequencies than solid PTFE offers. Mechanically,. Second Shield Silver Plated Copper Braid 0. 12 at 100 Hz). Test Methods The loss tangent is then defined as the ratio (or angle in a complex plane) of the lossy reaction to the electric field E in the curl equation to the lossless reaction: Solution for the electric field of the electromagnetic wave is where: ω is the angular frequency of the wave, and λ is the wavelength in the dielectric material. 4" L=10. For example, the dielectric constant and loss tangent of 30 vol% hybrid fillers/PTFE composites are 3. Low values of Df result in a “fast” substrate while large values result in a “slow” substrate. The only way you can reduce it is to use a dielectric with a very low loss tangent, or low dielectric constant. , the central and the outer conductor, were modeled as perfect electric conductor (PEC). 05 and loss tangent of 0. A very high intense and sharp peak was observed at 40. Dielectric: Solid Polytetrafluoroethylene (PTFE) Shield (Outer Conductor): Double Silver Covered Copper Shields; Jacket: Flourinated Ethylene Propylene (FEP) Type IX per MIL-C-17; RG 400 Diameter. Silicon dioxide-filled semi-rigid coax cables can withstand temperatures that would cause PTFE-filled cables to catch on fire! Fused silica and fused quartz are forms of silicon dioxide. This material is a rigid, thermoset laminate that is capable of. Appl. Test Method: IPC-TM-650 2. There is also an add-on Material Library product, which contains up to 24 separate material properties and 10,328 materials with more than 84,000. This increase is expected since glass has a higher Dk than LCP. Low dielectric tolerance and low loss • Excellent electrical performance • Allows applications with higher operating frequencies • Ideal for. 3). Additionally, as shown in [14,15] fleece fabric provides sufficient thickness for an adequate bandwidth. Variation of density and dielectric constant with respect to weight fraction of fused silica in the PTFE matrix is shown in Fig. 2. 00005. 05, high signal loss Tg – 130°C max glass transition temperature Flammability – Self-extinguishes but not fastest suppression. The Lynch formula [1] can be used to predict the change in Loss tangent loss Rule of Thumb #116. The effect of surface treatment on the morphology, thermal conductivity and dielectric properties of PTFE-based composites is investigated. for most PTFE based laminates. This low-loss material is preferred over traditional PTFE materials for microwave and millimeter frequency applications. FR-4 is a composite material composed of woven fiberglass cloth with an epoxy resin binder that is flame resistant (self-extinguishing). PTFE is known as non-absorbent (k close to 0), its relative permittivity n=2. A new kind of ZrTi2O6 filled polytetrafluoroethylene (PTFE) microwave composite substrates was fabricated through the hot-pressing process. 1% moisture absorption is ideal for packaging materials . 0% AlN/PTFE composites. 7–5. 008%) and temperature coefficient of dielectric constant (−18. 3 TiO 3 (CNT) ceramic possesses both high dielectric constant ( εr ~100) and low loss tangent (5. 5 and above Loss Tangent 0. The mixture was dried on a PTFE film at room temperature, and at 90 C for 30min. 01 and 0. 1. ties such as stable dielectric constant, low loss tangent, and good chemical resistance.