scholarly journals A Wideband Termination Based on Laser-Scribed Lossy Microstrip Line Structures

2021 ◽  
Vol 11 (15) ◽  
pp. 6960
Author(s):  
Ruo-Zhou Li ◽  
Zheyuan Wu ◽  
Junhui Ji ◽  
Xiaoxing Yin ◽  
Jing Yan ◽  
...  
Keyword(s):  
Sheet Resistance ◽  
Microstrip Line ◽  
Low Cost ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Strip Conductor ◽  
Resistive Film ◽  
Attenuation Level ◽  
Conductor Loss ◽  
Better Than

Laser-direct writing has become an alternative method to fabricate microwave devices. We present a laser-scribed wideband open-end termination that relies on conductor loss of the microstrip line structure to obtain effective absorption. The proposed design consists of a resistive film overlapped on a strip conductor, providing an enlarged sheet-resistance range (20 Ω/□ ~ 1.2 kΩ/□) of the resistive film to reduce the fabrication difficulties. The resistive film is in tapered shape to enable small gradual changes in impedance, yielding minimized reflections (|S11|). The prototype is demonstrated utilizing the laser-direct writing technique, with a measured |S11| over −15 dB from 6 GHz to at least 30 GHz. The termination can also be used for attenuation over a −10 dB attenuation level (>8.5 GHz) with a low reflection level better than −15 dB (>2.0 GHz). This study can be employed for the applications where cheap wideband planar terminations are needed and promote fast, flexible, and low-cost prototyping or modification of the existing microwave circuits.

A low cost and quasi-commercial polymer film chip for high-throughput inertial cell isolation

RSC Advances ◽  
2016 ◽  
Vol 6 (12) ◽  
pp. 9734-9742 ◽  
Author(s):  
Xinjie Zhang ◽  
Di Huang ◽  
Wenlai Tang ◽  
Di Jiang ◽  
Ke Chen ◽  
...  
Keyword(s):  
Polymer Film ◽  
High Throughput ◽  
Low Cost ◽  
Cell Isolation ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Roll To Roll

We propose a novel scheme for fast fabrication (<20 minutes) of ultra-low-cost (∼1.5 cents) polymer film chips using laser direct writing and roll-to-roll lamination.

scholarly journals 26 GHz phase shifters for multi-beam nolen matrix towards fifth generation (5G) technology

2019 ◽  
Vol 8 (3) ◽  
pp. 1028-1035
Author(s):  
Norhudah Seman ◽  
Nazleen Syahira Mohd Suhaimi ◽  
Tien Han Chua
Keyword(s):  
Dielectric Constant ◽  
Microstrip Line ◽  
Return Loss ◽  
Phase Shifter ◽  
Low Cost ◽  
Phase Shifters ◽  
Substrate Thickness ◽  
Fifth Generation ◽  
Compact Size ◽  
Better Than

This paper presents the designs of phase shifters for multi-beam Nolen matrix towards the fifth generation (5G) technology at 26 GHz. The low-cost, lightweight and compact size 0° and 45° loaded stubs and chamfered 90°, 135° and 180° Schiffman phase shifters are proposed at 26 GHz. An edge at a corner of the 50 Ω microstrip line Schiffman phase shifter is chamfered to reduce the excess capacitance and unwanted reflection. However, the Schiffman phase shifter topology is not relevant to be applied for the phase shifter less than 45° as it needs very small arc bending at 26 GHz. The stubs are loaded to the phase shifter in order to obtain electrical lengths, which are less than 45°. The proposed phase shifters provide return loss better than 10 dB, insertion loss of -0.97 dB and phase difference imbalance of ± 4.04° between 25.75GHz and 26.25 GHz. The Rogers RT/duroid 5880 substrate with dielectric constant of 2.2 and substrate thickness of 0.254 mm is implemented in the designs.

scholarly journals Fabrication and performance of an ultrafine silver grid film applied to flexible touch sensor

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Genchu Tang ◽  
Bin Tang
Keyword(s):  
Sheet Resistance ◽  
Optical Transmittance ◽  
Direct Writing ◽  
Imprint Lithography ◽  
Laser Direct Writing ◽  
Transparent Conductive Electrode ◽  
Touch Sensor ◽  
And Performance ◽  
Ag Paste ◽  
Nano Imprint

AbstractThe fabrication and performance of an ultrafine silver (Ag) grid film applied to flexible touch sensor as the transparent conductive electrode is reported. The ultrafine Ag grid film was fabricated based on the laser direct writing, electroforming, nano-imprint lithography. In the manufacturing process, firstly, the Nickel (Ni) mold used as the master mold was obtained by laser direct writing and electroforming technologies. Secondly, the micro-grooves were transferred from the Ni mold onto the surface of UV glue coated on the polyethylene terephthalate film through nano-imprinting technology. Lastly, the ultrafine Ag grid was generated through nano-imprint lithography with Ag paste filled into the micro-grooves on the UV glue. The result indicated that the ultrafine Ag grid film with size (L) 640 mm × (W) 520 mm had a uniform line width of 1.01 μm and showed excellent optoelectronic and mechanical properties, such as optical transmittance 90.00%, Haze 1.49%, sheet resistance 5.4 Ω/□, the variation ratio of the sheet resistance within 3% after 8000 bending cycles, and the almost negligible morphology change after the adhesion cross-cut test. Furthermore, the functional test was performed on a flexible touch sensor applying the ultrafine Ag grid film.

Laser Power Characterization Method for Fabrication of Centrosymmetric CR-DOEs Mask

2008 ◽  
Vol 53-54 ◽  
pp. 337-342
Author(s):  
Duo Shu Wang ◽  
Chong Tai Luo ◽  
Tao Chen ◽  
Yu Qing Xiong ◽  
Hong Kai Liu ◽  
...  
Keyword(s):  
Laser Power ◽  
Low Cost ◽  
Chromatic Aberration ◽  
Diffractive Optical Elements ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Optical Elements ◽  
Short Period ◽  
Diffractive Efficiency ◽  
Mask Fabrication

With high diffractive efficiency, Continuous Relief Diffractive Optical Elements (CR-DOE) can be used to eliminate chromatic aberration, partial aberration and simplify optical system. The technology for CR-DOE with Laser Direct Writing method has advantages of simple process, short period and low cost. The paper studied on the characterization method of laser power for the technology. The principle of mask fabrication of CR-DOE by Laser Direct Writing is described in the paper. The relations between microstructure depth and laser power, exposing position radius and laser power were studied. The results showed that microstructure depth changes in direct ratio to laser power and laser power should change in direct to exposing position radius while several same depth microstructures were fabricated at different radius. At the end, the paper gave the charactering method and also fabricated the mask of a kind of centrosymmetric continuous relief diffractive focus lens with the method.

Low cost fabrication of SiO2 optical waveguides by laser direct writing on Ti-doped Sol–Gel films

2011 ◽  
Vol 49 (3) ◽  
pp. 351-355 ◽  
Author(s):  
Aikui Li ◽  
Zemin Wang ◽  
Jiajun Liu ◽  
Xiaoyan Zeng
Keyword(s):  
Optical Waveguides ◽  
Low Cost ◽  
Sol Gel ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Sol Gel Films

Kajian Model Fisik Pengaruh Freeboard dan Susunan Buis Beton Sebagai Pemecah Gelombang Tenggelam Ambang Rendah (Pegar) Dalam Mereduksi Gelombang

2017 ◽  
Vol 1 (2) ◽  
pp. 34
Author(s):  
Zulkarnain Zulkarnain ◽  
Nadjadji Anwar
Keyword(s):  
Low Cost ◽  
Relative Depth ◽  
Submerged Breakwater ◽  
Wave Flume ◽  
Concrete Cylinder ◽  
Engineering Department ◽  
Sea Area ◽  
The Waves ◽  
Transmission Test ◽  
Better Than

The Research Center and Development of Water (Puslitbang) is currently developing the Submerged Breakwater in shallow sea area (PEGAR). The author is interested to examine the material that easily obtained in the field of RCP concrete cylinder. The observation is how it to be ability in function as submerged breakwater an go green and low cost. The physical model of wave transmission test is how the response to the structure in ability to damping of wave as the breakwater function. In this research breakwater used is submerged breakwater type by using concrete cylinder (buis beton). The purpose from this research is to know how the response of breakwater structure to the waves through it, with some variation of the structure by creating a structure with three variations of the arrangement and freeboard that is the relative depth with the crest width is constant. The wave generated test in this study is using regular waves in wave flume at FTSP Civil Engineering Department of Institute Technology Ten November. From the analysis of the effect of the installation of submerged breakwater by using concrete cylinder to the wave damping value, it can be concluded that the factors that are very influential is the freeboard and the composition of concrete cylinder. Scenario A (rigid vertical massive) is capable of producing the smallest value of kt is 0.33. As for scenario B (rigid horyzontal massive) with a damping value of 0.5, while the scenario C (rigid permeable) is only able to produce kt value of 0.71. Scenario A is better than scenario B and C Because the position of arrangement of A is very good used to damp wave in small or big freeboard conditions.

A Novel Wideband transition from Substrate Integrated Waveguide to Rectangular Waveguide

2020 ◽  
Vol 10 ◽  
Author(s):  
Keyur Mahant ◽  
Hiren Mewada ◽  
Amit Patel ◽  
Alpesh Vala ◽  
Jitendra Chaudhari
Keyword(s):  
Rectangular Waveguide ◽  
Printed Circuit Board ◽  
Low Cost ◽  
Single Layer ◽  
Circuit Board ◽  
Substrate Integrated Waveguide ◽  
Ka Band ◽  
Better Than ◽  
Millimeter Wave Circuits ◽  
Wideband Transition

Aim: In this article, wideband substrate integrated waveguide (SIW) and rectangular waveguide (RWG) transition operating in Ka-band is proposed Objective: In this article, wideband substrate integrated waveguide (SIW) and rectangular waveguide (RWG) transition operating in Ka-band is proposed. Method: Coupling patch etched on the SIW cavity to couple the electromagnetic energy from SIW to RWG. Moreover, metasurface is introduced into the radiating patch to enhance bandwidth. To verify the functionality of the proposed structure back to back transition is designed and fabricated on a single layer substrate using standard printed circuit board (PCB) fabrication technology. Results: Measured results matches with the simulation results, measured insertion loss is less than 1.2 dB and return loss is better than 3 dB for the frequency range of 28.8 to 36.3 GHz. By fabricating transition with 35 SRRs bandwidth of the proposed transition can be improved. Conclusion: The proposed transition has advantages like compact in size, easy to fabricate, low cost and wide bandwidth. Proposed structure is a good candidate for millimeter wave circuits and systems.

Wavelength tunable fiber Bragg gratings fabricated by stress annealing assisted femtosecond laser direct writing

2021 ◽  
Vol 61 ◽  
pp. 102427
Author(s):  
Xiaoyan Sun ◽  
Zikun Chang ◽  
Li Zeng ◽  
Xinran Dong ◽  
Youwang Hu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Wavelength Tunable
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