Search

Highly ordered mesoporous zeolite thin films (MZTFs) are grown at rigid substrates via molecular interaction from ternary structure-directing agents (SDAs) in a Stober-like condition. The ultrathin films (10–20 nm) were deposited layer-by-layer via self-assembly of β-zeolite seeds and SDAs at 40–50 °C, resulting reticular cellular pores and perpendicular nanochannels with average pore sizes (6.7 ± 1.1 nm). The walls of the nanochannels consist of zeolitic structures in microcrystallines. Compared to cylindrical mesochannels of amorphous silica thin films, the MZTFs with reticular mesochannels demonstrate 5R/6R stretching modes (550–650 cm–1) and significantly enhanced hydrothermal stability. The MZTFs were characterized in top-view and cross-sectional electron microscopies (SEM/HRSEM/HRTEM) as well as X-ray scattering techniques (GIXRD/GISAXS), which confirm a body-centered tetragonal (Im3m) unit cell with unique Moire patterns. Upon calcination, the film thickness is reduced to 10.6 nm with a structure ...

Compact six-channel diplexer (1.575/2.4/5.2 GHz and 1.8/3.5/5.8 GHz) using multipath quarter wavelength stepped impedance resonators (SIRs) is proposed. The sixchannel diplexer includes two pairs of magnetically coupled SIRs by grounded via hole. The resonant frequencies of each channel can be easily determined by changing the impedance ratio (K) and length ratio ( $\alpha $ ) of SIRs. The diplexer provides the advantages of effective design method, low loss, high passband selectivity, compact circuit size, and very useful for applying on the multi-band wireless communication systems.

The compact triple-passband bandpass filter base on uniform impedance ring resonators (UIRRs) is proposed. The filter has advantages of high passband selectivity, having closed adjacent passbands and compact circuit size. The resonators with magnetically coupling by grounding via hole are designed to have tree resonant paths at 1.22 GHz, 1.5 GHz and 1.8 GHz. The resonant frequencies can be easily controlled by tuning L3, L4 and L5 for each resonant paths of the resonator. The triple-passband bandpass filter is showing a simple configuration, an effective design method and a small circuit size. The measured results are in good agreement with the simulation results.

We proposed the new high conductivity material for developing the high transparent dipole antenna. The proposed material is based on the nano-structured thin film and deposited on the glass substrate. Our invented activation process is used to rearrange the direction of nano-structure inside the thin film from disorder to order arrangements. The transmittance of antenna can be achieved to 80%. The overall dimension size of the antenna is 47 × 10 mm2 and achieving the measured bandwidth of 18%. The antenna is showing a simple configuration and an effective design method for applying on transparent electronics fields.

This paper presents a compact dual-band bandpass filter that involves using the quarter wavelength stepped impedance resonators (SIRs) for achieving simultaneously compact circuit size and good dual-band performance. The filter is designed at 2.4 / 3.5 GHz and constructed by two pairs of quarter wavelength SIRs and source-load lines. By properly tuning the impedance ratio, length ratio and radius of via hole of the SIRs, dual-passbands performance can be easily determined. To improve the passband selectivity, the use of source-load lines is to increase coupling energy between the resonators. The filter is showing simple configuration, effective design method and small circuit size. The measured results are in good agreement with the simulation results., {"references":["J. S. Hong and M. J. Lancaster, Microstrip Filters for RF/Microwave Application, 2nd ed. New York: Wiley, 2011.","H. W. Wu, Y. F. Chen and Y. W. Chen, \"Multi-layered dual-band bandpass filter using stub-loaded stepped-impedance and uniform-impedance resonators,\" IEEE Microw. Wireless Compon. Lett., vol. 22, no. 3, pp. 114–116, Mar. 2012.","F. C. Chen and Q. X. Chu, \"Novel multi stub loaded resonator and its application to high-order dual-band filters,\" IEEE Trans. Microw. Theory Tech., vol. 58, no. 6, pp. 1551–1556, Jun. 2010.","C. H. Tseng and H. Y. Shao, \"A new dual-band microstrip bandpass filter using net-type resonators,\" IEEE Microw. Wireless Compon. Lett., vol. 20, no. 4, pp. 196–198, Apr. 2010.","W. S. Chang and C. Y. Chang, \"Analytical design of microstrip short circuit terminated stepped-impedance resonator dual-band filter,\" IEEE Trans. Microw. Theory Tech., vol. 59, no. 7, pp. 1730–1739, Jul. 2011.","X. Y. Zhang, C. H. Chan, Q. Xue and B. J. Hu, \"Dual-Band Bandpass Filter With Controllable Bandwidths Using Two Coupling Paths,\" IEEE Microw. Wireless Compon. Lett, vol. 20, no. 11, pp. 616-618, Nov. 2010.","C. W. Tang and P. H. Wu, \"Design of a Planar Dual-Band Bandpass Filter,\" IEEE Microw. Wireless Compon. Lett, vol. 21, no. 7, pp. 362-364, July. 2011.","P. H. Deng and J. H. Jheng, \"A switched reconfigurable high-isolation dual-band bandpass filter,\" IEEE Microw. Wireless Compon. Lett., vol. 21, no. 2, pp. 71–73, Feb. 2011.","M. Makimoto, and S. Yamashita, \"Bandpass filters using parallel coupled stripline stepped impedance resonators,\" IEEE Trans. Microw. Theory Tech., vol. 28, pp. 1413-1417, Dec. 1980.\n[10]\tH. W. Deng, Y. J. Zhao, Y. Fu, X. J. Zhou, and Y. Y. Liu, \"Compact And High Selectivity Dual-mode Dual-band Microstrip BPF With Qwr And SLR\" Microw And Optical Technology Lett., vol. 000, no. 000, pp. 2702-2705, Dec. 2012.\n[11]\tV. Barbuddhye and A. Kakade, \"Dual-band Bandpass Filter Based On λ/4-Resonators For Wi-Fi Application,\" Microw And Optical Technology Lett., vol. 57, no. 12, pp. 2758-2761, Dec. 2015.\n[12]\tL. Lin, P. P. Xu, J. L. Liu, B. Wu, T. Su and C. C. Liang, \"Dual- Band Bandpass Filters Using a Novel Quad-Mode Stub-Loaded Ring Resonator,\" Progress In Electromagnetics Research, vol.55, pp. 31-38, Aug. 2015.\n[13]\tIE3D Simulator, Zeland Software, Inc. 2002."]}

This paper presents a compact triple-band bandpass filter that involves using the embedded stepped impedance resonators (SIRs) for achieving simultaneously compact circuit size and good triple-band performance. The embedded SIR is designed to have two resonant paths at 1.575 GHz, 3.5 GHz and 5.2 GHz. The resonant frequencies can be easily controlled by tuning impedance ratio (K 1 and K 2 ) and length ratio (α 1 and α 2 ) for each resonant paths in the embedded SIR. This study provides an effective method to easily design the triple-passband filter with compact circuit size, high passband selectivity and low insertion loss.

In this paper, a novel six-channel triplexer based on multipath-embedded stub loaded resonator is proposed. The six-channel triplexer (2.4 / 3.5 GHz, 5.2 / 6.8 and 5.8 / 8 GHz) is composed of three pairs of coupled multipath-embedded stub loaded resonator (SLRs) and the source-load coupling lines. The multipath-embedded SLRs are having two paths to form dual-passband response. The six-channel triplexer is showing a simple configuration, an effective design method, high passband selectivity and good band-to-band isolation. The measured results are in good agreement with the full-wave electromagnetic (EM) simulation results.