Design and Experimental Validation of Miniaturized Self-Triplexing Antenna Employing HMSIW

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ayman A. Althuwayb
Keyword(s):  
Experimental Verification ◽  
Experimental Validation ◽  
Substrate Integrated Waveguide ◽  
Cross Polarization ◽  
Frequency Bands ◽  
High Isolation ◽  
Operating Band

Abstract The design and experimental verification of miniaturized cavity-backed self-triplexing antenna (STA) with high-isolation employing half-mode substrate integrated waveguide (HMSIW) are presented in this work. The proposed STA is constructed by using HMSIW, an Y-shaped slot and three 50Ω feed lines. Three unequal radiating patches are generated by engraving an Y-shaped slot on the top surface of the HMSIW cavity to operate at 3.7/5.0/5.8 GHz for WiMAX/WLAN applications. The proposed STA allows to realize one of the operating band independently by keeping other operating band unaltered and vice-versa. The circuit area of STA is highly miniaturized due to the use of HMSIW cavity and loading of Y-shaped slot. The isolations between three ports are greater than 31 dB. The fabricated STA provides 5.5, 5.92 and 5.93 dBi peak gains at 3.7, 5.0 and 5.8 GHz, respectively. The efficiency of the STA is greater than 92% at all the frequency bands. The constructed STA has a front-to-back ratio of more than 23 dB and a separation of more than 21 dB between co-to-cross polarization levels. Fabrication and measurement are used to validate the intended STA.

Ultra-compact self-diplexing antenna based on quarter-mode substrate integrated waveguide with high isolation

2021 ◽  
pp. 1-6
Author(s):  
Ayman A. Althuwayb
Keyword(s):  
Frequency Band ◽  
Long Term Evolution ◽  
Substrate Integrated Waveguide ◽  
Cross Polarization ◽  
Cavity Resonators ◽  
Frequency Bands ◽  
High Isolation ◽  
Term Evolution ◽  
Better Than

Abstract This article presents the design of an ultra-compact cavity-backed self-diplexing antenna with high isolation employing quarter-mode substrate integrated waveguide (QMSIW). The proposed antenna is constructed by using QMSIW, slot, and two 50Ω feed lines. Two eighth-mode cavity resonators are designed by inserting a slot on the top side of the rectangular substrate integrated waveguide to operate at 2.6 and 4.9 GHz for long-term evolution and public safety band applications, respectively. The proposed design allows to tune any frequency band independently by keeping other bands unaltered. The size of antenna is ultra-compact, due to the use of QMSIW cavity. The isolation between two ports is >35 dB. The antenna achieves 5.34 and 5.68 dBi peak gains at 2.6 and 4.9 GHz, respectively. The efficiency of the antenna is >85% at both frequency bands. The antenna provides more than 20.9 dB front-to-back-ratio and better than 21 dB separation between co-to-cross polarization levels. The designed antenna is validated through fabrication and measurement.

scholarly journals Simple design of efficient broadband multifunctional polarization converter for X-band applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Thi Kim Thu Nguyen ◽  
Thi Minh Nguyen ◽  
Hong Quang Nguyen ◽  
Thanh Nghia Cao ◽  
Dac Tuyen Le ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Incident Angle ◽  
Polarization Conversion ◽  
Simple Design ◽  
Cross Polarization ◽  
Polarization Converter ◽  
Frequency Bands ◽  
X Band ◽  
Cost Efficient ◽  
Patch Resonators

AbstractA simple design of a broadband multifunctional polarization converter using an anisotropic metasurface for X-band application is proposed. The proposed polarization converter consists of a periodic array of the two-corner-cut square patch resonators based on the FR-4 substrate that achieves both cross-polarization and linear-to-circular polarization conversions. The simulated results show that the polarization converter displays the linear cross-polarization conversion in the frequency range from 8 to 12 GHz with the polarization conversion efficiency above 90%. The efficiency is kept higher than 80% with wide incident angle up to 45°. Moreover, the proposed design achieves the linear-to-circular polarization conversion at two frequency bands of 7.42–7.6 GHz and 13–13.56 GHz. A prototype of the proposed polarization converter is fabricated and measured, showing a good agreement between the measured and simulated results. The proposed polarization converter exhibits excellent performances such as simple structure, multifunctional property, and large cost-efficient bandwidth and wide incident angle insensitivity in the linear cross polarization conversion, which can be useful for X-band applications. Furthermore, this structure can be extended to design broadband polarization converters in other frequency bands.

Experimental Verification of Distortion Analysis of Welded Stiffeners

2002 ◽  
Vol 18 (04) ◽  
pp. 216-225
Author(s):  
M. V. Deo ◽  
P. Michaleris
Keyword(s):  
Experimental Verification ◽  
Experimental Validation ◽  
Welding Process ◽  
Computational Results ◽  
Buckling Mode ◽  
Fea Model ◽  
Buckling Stress ◽  
Distortion Analysis ◽  
Process Simulations ◽  
Buckling Distortion

This paper presents an experimental verification for the predictive distortion analysis approach proposed in Michaleris & DeBicarri (1996,1997) and Vanli & Michaleris (2001) for welded T-type stiffeners. The predictive technique employing the decoupled 2-D and 3-D approach is used for the prediction of buckling distortion and the magnitude of bowing distortion. Two-dimensional thermo-mechanical welding process simulations are performed to determine the residual stress. The critical buckling stress along with the buckling mode are computed in 3-D eigenvalue analyses. Large deformation analyses are carried out to predict the magnitude of bowing distortion. Experimental validation of the prediction is carried out in the lab. Welding experiments are carried out using welding conditions identical to those used in the FEA model. The computational results are then verified with experimental observations

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