Papers by Keyword: LTCC

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Authors: Bing Yao Liu, Jian Ming Zhou, Ze Quan Guo, Jia Jun Fu
Abstract: This paper demonstrates a new Low Temperature Co-fired Ceramic (LTCC) U-shape resonator. Based on this 3D structure, a Ka-band Substrate Integrated Waveguidebandpass filter isdesigned. Compared with the conventional two dimensional PCB, LTCC technology achieveshigher Qe factor, higher density, smaller size, and lower cost. EM simulator HFSS is employed in determining and optimizingthephysical dimension of the filter.The filter's simulation results showfractional bandwidth (FBW) of3.94% centered at 34.7 GHzwith insertion loss of -1.2 dB and return loss of -20 dB in the passband. The attenuation of -30dB is obtained at 32.8 GHz and 36.8 GHz.
Authors: Li Fa Wang, Rui Xia Yang, Jing Feng Wu, Ying Qian Jia
Abstract: In this paper, a low phase noise hybrid integrated voltage-controlled oscillator (VCO) module with harmonic suppression based on LTCC technology is presented. This is the first report about the hybrid integrated VCO module based on the LTCC substrate in china mainland. The design is simulated and optimized by the ansoft designer and the ansoft HFSS software. To miniaturize the VCO module, two capacitors and an inductor that adjust the oscillation frequency and two capacitors as feedback capacitors are buried in the LTCC substrate. Three resistances for direct current bias are made on the surface of the LTCC substrate. Also the low-pass filter that used for harmonic suppression is embedded in the LTCC substrate. The VCO module achieves an output power of more than 10 dBm in a tuning range between 1000-1200MHz. The measured phase noise is lower than -112.2 dBc/Hz at 10KHz offset between 1000-1200MHz. The overall dimension is as small as 8 mm×7 mm×3.5 mm.
Authors: A. Priya Rathi, A. Vimala Juliet
Abstract: A three-dimensional microfluidic biosensor has been successfully designed using a low temperature co-fired ceramic (LTCC) technology. This microfluidic sensor consists of mixing, focusing and measuring region. The mixing region is a rectangular shaped channel, to enable the complete mixing of sample and buffered saline solution. An electrode pair in the focusing region uses negative dielectrophoretic forces to direct the cells from all directions of the channel towards the center. The measuring region consists of eleven pairs of gold plated electrodes to measure the change in impedance whenever a cell passes through it. The layout of the design is made using AUTOCAD tool and simulated using COMSOL Multiphysics. The results demonstrate the mixing efficiency of two fluids for different velocities.
Authors: Masaru Iwao, Yoshio Umayahara, Kazuyoshi Shindo
Abstract: For high frequency packaging applications, LTCC materials are required to have a low loss tangent to reduce the total microwave loss. For multi-layered ceramic devices with embedded passive components, besides a loss tangent, a small temperature coefficient of resonance frequency (TCF) is an important factor. To meet these demands, we developed a new LTCC material with a smaller TCF, less than +/-3ppm/oC, and a low loss tangent, 0.0012 at 15GHz. We designed the glass composition to precipitate two low-loss crystal phases during firing at 900 oC. One phase has a plus TCF and the other phase has a minus TCF. We also controlled the amount of the two crystal phases, so these crystal phases and the fixed amount of alumina filler make the sum of TCF for the LTCC material close to zero.
Authors: Bao Xing Zhou, Yue Xia Zhang, Ru Niu Fang
Abstract: This paper reports a readout system for a piezoresistive accelerometer which is fabricated by LTCC thick-film process technology. The authors first introduce a LTCC compatible design of this new kind of accelerometer, which is based on piezoresistive phenomenon. As the performance of the accelerometer circuitry is affected by temperature, a readout system is introduced for compensating the temperature drift and the non-linearity of this piezoresistive accelerometer by using the MAX1452 processor. The authors give the principles of the temperature compensation and the executive processes. The readout system also includes a ZigBee wireless transmission system and a real-time curve display window. Some tests on the system are carried out and the results manifest that the readout system designed in this paper is workable.
Authors: Zhi Gang Wang, Hao Ding
Abstract: In this paper, a W-band dual-mode substrate integrated cavity fourth-order band-pass filter is presented, which utilizes LTCC technology. The filter is composed of two dual-mode resonators which are constructed by rows of via arrays in the substrate layer. Two coupling vias near particular diagonal corners are set to perturb the two degenerate modes in each cavity and thus to generate an intra-cavity coupling. The filter exhibits 3dB bandwidth about 2.4GHz, return loss better than 19dB and out of band rejection better than 30dB. The filter occupies the area of 3.752mm4.064mm (including the two feeding lines) in the LTCC substrate.
Authors: Byung Hae Jung, Seong Jin Hwang, Hyung Sun Kim
Abstract: A low-temperature co-fired composition with sintering temperature of <900 °C was developed using rare earth derived borate glass (La2O3-B2O3-TiO2) and a conventional BNT (BaONd2O3-TiO2) ceramic. The sintering behavior, phase evaluation, sintered morphology, and microwave dielectric properties were investigated. It was found that increasing the sintering temperature from 750 to 850°C leads to increases in shrinkage, densities and microwave dielectric properties (≈ 20 for εr and >8000 for Q*f0). However, after 850 °C , the values of these properties decreased. It is suggested therefore that this new composite has good potential as a new candidate for low temperature co-fired ceramic (LTCC) materials.
Authors: Xing Yun Li, Ji Zhou
Abstract: Luminescent low temperature co-fired ceramic (LTCC) was prepared by sintering powders selected from BaO-TiO2-B2O3-SiO2 system with limited amount of additive (Dy3+). It was found that the optimal sintering temperature was 900°C based on the microstructure and the properties of sintering bodies, and then the major phases of the LTCC were Ba2(TiO)Si2O7 and SiO2. The experimental results indicated that the glass-ceramic possesses good yellow emission under 454nm excitation, excellent dielectric properties: εr= 13.09, tanδ<0.001 at 1 MHz. Thus, this material is supposed to be used as the LTCC substrate material for the application in white LED packaging.
Authors: Yan Ming Zhang, Jia Nan Wang, Yu Ting Cai
Abstract: A compact LTCC filter using LC resonators is presented. The resonator is made up of the multilayer capacitors and inductors, which are printed on multilayer ceramic. Four resonators are exploited, which makes the filter have wide passband. By properly controlling the coupling elements of each resonator, two transmission zeros can be located at both sides of the passband for better selectivity. Measured results show a bandwidth of more than 47.2%, where the centre frequency is 1.25GHz. The whole size of the filter is 4.5×3.2×1.7mm3.
Authors: Sung Hyuk Lee, Gary L. Messing, E.R. Twiname, A. Mohanram, Clive A. Randall, D.J. Green
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