Transparent Branch-Line Coupler Using Micro-Metal Mesh Conductive Film

Sa’ad, Bashir Muhammad; Rahim, Sharul Kamal Abdul; Peter, Thomas; Rani, Mohd Subri Bin Abdul; Ausordin, Siti Fatimah; Zaidel, D. N. A.; Krishnan, C.N.

doi:10.1109/lmwc.2014.2361655

Cited by 16 publications

(10 citation statements)

References 15 publications

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“…Generally, OEDs structure is based on TCSs, such as FTO (fluorine-doped tin oxide) glass, ITO (indium tin oxide) glass, FTO PEN (polyethylene naphthalate) plastic, ITO PEN, FTO PET (polyethylene terephthalate), ITO PET, and so on [1][2][3][4][5][6][7][8][9]25]. TCS is constructed of substrate and transparent conductive film.…”

Section: Principlementioning

confidence: 99%

“…Transparent conductive substrates (TCSs) are characterized by their high transmission of visible light and simultaneously very high electrical DC (direct current) sheet conductivity [1][2][3][4][5][6]. TCSs can be applied as the transparent electrodes, which are the key component of optoelectronic devices (OEDs) for information (displays) and energy (photovoltaics, window glass and architectural) technologies [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Improving External Quantum Efficiency by Subwavelength Nano Multi-Layered Structures for Optoelectronic Devices

Wang

Zhou

et al. 2020

IEEE Access

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Based on thin film optics (TFO) and finite element method (FEM), we have theoretically investigated improving external quantum efficiency (EQE) by anti-reflection (AR) films constructed from subwavelength nano multi-layers (NML) of low and high index materials, where the low and high index materials are MgF2 and Ta2O5, respectively. This kind of NML dielectric structures have the advantages of low-cost and flexible. Three kinds of substrates have been studied here, which are glass, polyethylene naphthalate (PEN), and polyethylene terephthalate (PET), respectively. TFO theory has been used to obtain the transmittance and reflectance, which agrees well with FEM results. For NML structure, TFO is more efficient than FEM in terms of calculation time and accuracy. The average AR effects (AAREs) are about 3.69%, 3.46% and 3.07% on glass substrate, about 6.15%, 5.56% and 5.02% on PEN substrate, and about 5.06%, 4.62% and 4.17% on PET substrate, for AR bands (ARBs) 350~800 nm, 350~1100 nm and 350~1500 nm, respectively. The results also reflect that wider AR bandwidth needs more NML layers. In practice, this kind of AR films can be widely applicable to enhance the EQE of the optoelectronic devices (OEDs). INDEX TERMS Anti-reflection, nano multi-layers, thin film optics, finite element method.

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Section: Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving External Quantum Efficiency by Subwavelength Nano Multi-Layered Structures for Optoelectronic Devices

Wang

Zhou

et al. 2020

IEEE Access

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“…Moreover, it offers high efficiencies of 43% and 46% and peak gains of 0.74 and 2.30 dBi at 2.44 and 5.5 GHz, which are much higher than those of other materials such as TCOs. In [31], a transparent 3 dB Branch-Line Coupler based on a micro metal mesh conductive film is investigated, operating at 2.45 GHz. This antenna pattern is printed on a stacked substrate which has PET/glass/PET layers.…”

Section: Copper Nanowiresmentioning

confidence: 99%

“…The fabricated antenna shows good dual band performance such that the return loss value has a reasonable value (less than −10 dB) at the frequency of interest, as illustrated in Figure 9b. In [31], a transparent 3 dB Branch-Line Coupler based on a micro metal mesh conductive film is investigated, operating at 2.45 GHz. This antenna pattern is printed on a stacked substrate which has PET/glass/PET layers.…”

Section: Ultra-thin Metal Filmsmentioning

confidence: 99%

Optically Transparent Nano-Patterned Antennas: A Review and Future Directions

et al. 2018

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Transparent antennas have been continuously developed for integration with solar cells, vehicular communications, and ultra-high-speed communications such as 5G in recent years. A transparent antenna takes advantage of spatial extensibility more so than all other antennas in terms of wide range of usable area. In addition, the production price of transparent antennas is steadily decreasing due to the development of nano-process technology. This paper reviews published studies of transparent antennas classified by various materials in terms of optical transmittance and electrical, sheet resistance. The transparent electrodes for the transparent antenna are logically classified and the transparent antennas are described according to the characteristics of each electrode. Finally, the contributions transparent antennas can make toward next-generation 5G high-speed communication are discussed.

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“…Recently, some microwave components, such as antennas and couplers, have been designed using transparent conductive film (TCF) for the purpose of aesthetics [9,10,11,12,13]. There are a lot of kinds of optically transparent and electrically TCFs manufactured by Cima Nano Tech company using self-assembling nanoparticle technology [9,10,11]. The sheet resistance of micro metal mesh conductive (MMMC) film is much lower than other TCFs such as indium tin oxide (ITO) [12], AgHT-8 and AgHT-4 [13].…”

Section: Introductionmentioning

confidence: 99%

An Optically Transparent Metasurface-Based Resonant Cavity Fed by Patch Antenna for Improved Gain

Chen

2019

Materials

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An optically transparent metasurface (MS) is proposed to design a resonant cavity fed by a patch antenna operating at 5.6 GHz. In the proposed MS, a transparent micro metal mesh conductive (MMMC) film is used as the transparent conducting film (TCF), and it has a high optical transmittance of more than 75% and a low sheet resistance of 0.7 Ω/sq. The MS is composed of a layer of glass substrate and a layer of MMMC film. The unit cell of MS consists of a square patch using MMMC film patterned on a square glass substrate. The transparent MS, patch antenna, ground plane, and air-filled half-wavelength cavity form a resonant cavity antenna, to achieve an improved gain. The MS is designed, optimized and analyzed using the EM simulation software CST. Results show that the MS can improve the simulated boresight gain from 4.7 to 13.2 dBi by 8.5 dB, without affecting the impedance bandwidth (IMBW) much. The losses of MS with different values of sheet resistance are also studied, showing the MS using MMMC with sheet resistance of 0.7 Ω/sq has very small losses.

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Transparent Branch-Line Coupler Using Micro-Metal Mesh Conductive Film

Cited by 16 publications

References 15 publications

Improving External Quantum Efficiency by Subwavelength Nano Multi-Layered Structures for Optoelectronic Devices

Improving External Quantum Efficiency by Subwavelength Nano Multi-Layered Structures for Optoelectronic Devices

Optically Transparent Nano-Patterned Antennas: A Review and Future Directions

An Optically Transparent Metasurface-Based Resonant Cavity Fed by Patch Antenna for Improved Gain

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