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Electrohydrodynamic lithography of metallic mesh for optically transparent flexible and conformal antennas

Science China(Technological Sciences) 2023年第1期66卷 2-12页

作者： YE Dong XIE Han TIAN Yu WEN JunMin SHI ZeYing AN Kang ZHANG YuPeng HUANG YongAn State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China Flexible Electronics Research Center Huazhong University of Science and TechnologyMichan 430074China Innovation and Research Institute of HIWING Technology Academy Bejjing 100740 China

The optically transparent antenna is becoming a very attractive proposition for various applications, such as wearable devices and vehicle radars. The fabrication of transparent flexible/conformal antennas is a long-lasting interest in academia and ***, the preparation of radio-frequency radiators with excellent conductivity and optical transmittance is still quite challenging. Herein, we introduce a facile approach to directly fabricate optically transparent flexible and conformal coplanar waveguide-fed antennas using programmable electrohydrodynamic lithography. Metallic meshes with transmittance above 90%have been successfully created based on the conformal electrohydrodynamic printing of high-viscosity photoresist masks, and the corresponding sheet resistance can be tuned down to ~2 Ω/□. Then, the geometrical structure of the proposed transparent antenna has been systematically optimized because of the basic radio frequency components, including the radiator, feeder line,ground plane, and size of metallic meshes. Optically transparent flexible and conformal antennas are finally obtained, presenting an optical transmittance of 92% and 55%, respectively. The simulated and measured results demonstrate that the transparent antennas with a good optoelectronic performance indeed exhibit a nice electromagnetic behavior. We believe that this newly developed conformal electrohydrodynamic lithography method can be utilized to fabricate a variety of other transparent electronic devices, such as transparent electromagnetic shielding meshes on aircraft canopies, in the future.

关键词： electrohydrodynamic lithography flexible/conformal metallic mesh transparent antenna ultra-wideband

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Comparative Study of the Performances of Opaque and transparent Patch antennas

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Open Journal of antennas and Propagation 2022年第2期10卷 17-28页

作者： Abdoulaye Sissoko Anne Chousseaud Tchanguiz Razban Marc Brunet Sté phane Ginestar Badié Diourté Institut d’É lectronique et des Technologies du numé Rique Nantes France Université des Sciences des Techniques et des Technologies de Bamako Bamako Mali

The performances of two microstrip patch antennas with low visual impact are presented in this paper and compared to an opaque solution. These consist in a copper film deposited on a Borofloat 33 glass substrate through a thin titanium gripping layer. The mesh is obtained by wet chemical etching. antennas differ by the dimensions in the ground plane mesh pattern. The opaque antenna only consists of a full copper deposit. The transparency work was mainly carried out on the ground plane as it is the largest area available. Specific attention is paid to optical transparency in the visible light spectrum, sheet resistance and electromagnetic performances in the [2.8;3 GHz] bandwidth. They are measured in each case, compared and discussed. Both simulations and measurement results show good performance, especially the antenna with the most transparent ground plane: a high level of optical transparency of almost 73%, coupled with a sheet resistance of less than 0.028 Ohms/sq and a gain of about 3.22 dBi at 2.8 GHz, slightly higher than the gain of the reference opaque antenna of about 2.66 dBi at 2.99 GHz. The opaque reference antenna has a bandwidth of 1.30 GHz while those of the transparent antennas are about 1.60 GHz and 2.10 GHz (S11 antenna solutions in ISM band.

关键词： Conductor Meshed Optical Transparency Radiation Pattern transparent antenna

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Wideband One Way antenna without Grounding

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Journal of Energy and Power Engineering 2018年第5期12卷 244-265页

作者： Michael Bank Telecommunication System Engineering Jerusalem College of Technology Jerusalem 91160 Israel

This article proposes a new type of antenna which allows getting rid of certain limitations of classic monopole antenna. Like a normal monopole, this antenna belongs to a class of radio antenna consisting of a straight rod-shaped conductor. But unlike a classic monopole, this antenna can operate at all frequencies of a very wide range. In addition, it does not require grounding. The article considers the wide possibilities of antenna applications.

关键词： Dipole monopole MB antenna inverter WBMB antenna S11 gain folded dipole magnetic antenna antenna reactive resistance transparent antenna nullifier circular polarization single line.

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