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Vol. 119, 105-116, 2023
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Design of a Novel Miniaturized Wide Stopband Filtering Coupler
Xiaming Mo , Yongkang Yuan , Minquan Li , Pingjuan Zhang , Yajing Yan , Guangxiu Zhao and Ziyun Tu
This paper designs a miniaturized, wide stopband microstrip filtering coupler based on coupled resonators. Firstly, a short-stub loaded uniform-impedance resonator (SSLUIR) is proposed, , and the size of the SSLUIR is reduced by adjusting the impedance ratio of the stubs and bending them. Then, the resonance performance of SSLUIR during electrical and magnetic coupling is studied. By adjusting the electrical length of the short stubs, higher harmonics are suppressed, and the upper stopband is widened. Finally, a 3 dB 180° microstrip filtering coupler is designed based on SSLUIRs. The measurement results show that the center frequency of the filtering coupler is 2.43 GHz, with a relative bandwidth of 6.6%. It can suppress harmonics within the 8.2f0 range by more than 18 dB and has a size of 0.23λg×0.33λg. The correctness of the design method for miniaturized and wide stopband filtering coupler has been verified.
Design of a Novel Miniaturized Wide Stopband Filtering Coupler
Vol. 119, 89-103, 2023
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Millimeter Wave Attenuation in the Coastal Area of the Gulf of Guinea Subject to Heavy Rainfalls
Benjamin Tanga Louk , Raphael Onguene , Serge Raoul Dzonde Naoussi , Sakaros Bogning , Jacques Etame , Modeste Kacou and Patrick Herve Ntanguen
Wireless communication systems have developed significantly over the last few decades. Due to the saturation of lower frequencies of microwave spectrum (3-30 GHz) and the increasing need for high speed, emerging systems for consumer or professional use are progressively shifting to upper microwave and millimeter waves. Our study proposes a methodology for evaluating and classifying losses on a vertically polarized millimeter wave link at 80 GHz. To achieve this, we simulated the link budget of a Nokia 80UBT millimeter wave link operating in its real propagation space (with overground) with Pathloss 5.1 Design tool. Then we built a 3.58 km full-scale link in the Tongo-Bassa watershed of the coastal city of Douala in Cameroon. Analysing data collected over the period from December 06, 2020 to December 16, 2021 under Power BI allowed us to characterize the response of the millimeter signal in free space, during dry and rainy seasons. We then challenge ITU-R P.837-7 and ITU-R.P.838-3 Recommendations on statistical models of rainfall for propagation modeling, especially for millimeter signals propagated in an equatorial climate with heavy rainfalls. The study estimated a rainfall rate for 0.01% of the time at 110.1 mm/h, with a millimeter link cut-off for a rainfall rate greater than 64.8 mm/h, with a specific attenuation due to rain of 6.5 dB/km.
Millimeter Wave Attenuation in the Coastal Area of the Gulf of Guinea Subject to Heavy Rainfalls
Vol. 119, 75-88, 2023
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Global Optimization for Extinction Curve Reconstruction in Inverse Electromagnetic Scattering of Multiparticle Aggregates
Ying Li Thong and Tiem Leong Yoon
Generalized Mie theory provides a theoretical solution to the extinction cross-section curve of an electromagnetic scattering event with a multiparticle aggregate, given the configurational information of the constituent particles. However, deducing the configuration of the aggregate from the extinction cross-section curve is a non-trivial inverse problem that can be cast as a global optimization problem. To address this challenge, we propose a computational scheme that combines global optimization search algorithms with a calculator known as the Generalized Multiparticle Mie-solution The scheme is tested using mock scattering cross-section curves based on randomly generated aggregate configurations. The scheme successfully reproduces the scattering curve by minimizing the discrepancy between the two scattering curves. However, the ground-truth configuration is not reproduced, as initially expected. This is due to the inability of the global optimization algorithm scheme used in the present work to correctly locate the global minimum in the high-dimensional parameter space.Nonetheless, the partial success of the proposed scheme to reconstruct the mock curves provides an instructive experience for future attempts to solve the inverse electromagnetic scattering problem by fine-tuning the present approach.
Global Optimization for Extinction Curve Reconstruction in Inverse Electromagnetic Scattering of Multiparticle Aggregates
Vol. 119, 63-73, 2023
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Wideband Circularly Polarized Planar Antenna for X-Band Applications
May Abd Elazeem Abo-Elhassan , Asmaa Elsayed Farahat and Khalid Fawzy Ahmed Hussein
A wide band circularly polarized planar antenna of high radiation efficiency is proposed in the present work for future generations of wireless communications requiring circular polarization in the X-band of the microwave spectrum. The main radiating part of the antenna is a rectangular turn-shaped strip that is capacitively loaded by two corner-shaped parasitic elements. The antenna is fed through coplanar waveguide (CPW) region whose ground structure is defected by etching two rectangular annular slots. The purposes of both the corner-shaped parasitic elements and the rectangular annular slots of the CPW ground plane are to increase the impedance matching and the 3 dB axial ratio (AR) bandwidth, and to enhance the antenna efficiency. The design is achieved through complete parametric study to find the optimum dimensions of the antenna. A prototype of the proposed antenna is fabricated for experimental assessment of its performance. The results obtained by both simulation and experimental measurements show that the impedance matching bandwidth is about 5.3 GHz (8-13.3 GHz); the 3 dB AR bandwidth is about 3.1 GHz (8-11.1 GHz); the maximum gain ranges from 4.5 to 5.5 dBi; and the radiation efficiency is higher than 98% over the operational frequency band.
Wideband Circularly Polarized Planar Antenna for X-band Applications
Vol. 119, 51-62, 2023
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Investigation on Performance of Four Port MIMO Antenna Using Electromagnetic Band Gap for 5G Communication
Govindarao Tamminaina and Ramesh Manikonda
In order to support 5G communication, this article suggests a small, four-port MIMO antenna with a G slot. This antenna has an electromagnetic band gap (EBG) in the shape of an S that is engraved on the substrate in the space between consecutive pairs of radiating patches. The recommended MIMO antenna is constructed from an FR4 substrate and measures 48x48x1.6 mm3. Between antenna elements 1 and 2, the integrated EBG structure of the MIMO antenna can reduce mutual coupling by 10.5 dB. The suggested four port G slot MIMO antenna with an S-shaped EBG structure displays the performance in terms of ECC less than 0.0002 and diversity gain larger than 9.99 with consistent frequency band extending from 3.3 GHz to 3.7 GHz. The proposed four port MIMO antenna is designed using HFSS software, and its simulation results are measured using anritsu combinational analyzer MS2037C vector network analyzer.
Investigation on Performance of Four Port MIMO Antenna Using Electromagnetic Band Gap for 5G Communication
Vol. 119, 37-50, 2023
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Star Shaped Fractal Conformal MIMO Antenna for WLAN, Vehicular and Satellite Applications
Chiranjeevi Reddy Sereddy and Usha Devi Yalavarthi
A compact and novel star shaped fractal microstrip patch conformal MIMO antenna suitable for WLAN, vehicular communications (5.855-5.925 GHz) and Fixed Satellite Services (FSS) applications is proposed in this paper. Analysis of planar and conformal single element and four element MIMO antennas is presented. Proposed star shaped fractal MIMO antenna is prototyped on Polyamide substrate of geometry 104 x 30 x 0.4 mm3. It achieved an impedance bandwidth (S11 < -10 dB) of 3.7 GHz operating from 4.53-7.86 GHz. Radiation patterns and surface current distribution are investigated at 5.9 GHz and 7.3 GHz center frequencies. A peak gain of 5.42 dB and 4.86 dB are obtained at 5.9 GHz and 7.3 GHz respectively. Radiation efficiency is more than 98% and MIMO performance parameters are also analyzed. Proposed conformal MIMO antenna showsfine diversity performance for WLAN, vehicular and FSS communications.
Star Shaped Fractal Conformal MIMO Antenna for WLAN, Vehicular and Satellite Applications
Vol. 119, 25-35, 2023
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H -Matrix Solver for the Acceleration of Boundary Integral Equation for Photonic Crystal Fiber
Jean-René Poirier , Julien Vincent , Priscillia Daquin , Ronan Perrussel and Han Cheng Seat
A waveguide mode solver based on boundary integral equation (BIE) method and matrix compression is developed in this study. Using an accurate discretization based on a Nystrom method and a kernel-splitting technique, the BIE method gives rise to three different formulations of a nonlinear eigenvalue problem. H-matrices are used in order to accelerate and increase the precision of the subsequent computations. Results from these investigations on a canonical photonic crystal fiber (PCF) chosen as an example demonstrate that the data sparse representation of the BIE discretization reduces the memory storage, as well as the assembly and solution times.
H-matrix Solver for the Acceleration of Boundary Integral Equation for Photonic Crystal Fiber
Vol. 119, 13-24, 2023
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Dual-Band 4-Port Vivaldi MIMO Antenna for 5G mmWave Applications at 28/39 GHz
Golla Ramyasree and Nelaturi Suman
A compact new dual band 4-port Vivaldi MIMO (Multiple-Input-Multiple-Output) antenna is designed for 5G mmWave applications. The proposed MIMO antenna resonates at two frequencies 28 GHz and 39 GHz, and it has dimensions 22x22x0.79 mm3. The Vivaldi structure etched on ground plane acts as a defected ground structure (DGS). The proposed antenna is fabricated on Rogers RT/duroid 5880 material having 0.79 mm thickness and 2.2 dielectric material. For high frequency and broad band applications RT/duroid material is suited to maintain low dielectric loss, and it works in high temperature places also. For the proposed four port Vivaldi MIMO antenna, the isolation between any two antenna elements is obtained below -21.59 dB. The bandwidths achieved for two bands are 4.64 GHz (26.31-30.95 GHz) at 28 GHz resonant frequency and 2.69 GHz (38.35-41.04 GHz) at 39 GHz resonant frequency for 4-port MIMO antenna. The gain achieved at 28 GHz is 5.65 dB and at 39 GHz is 5.53 dB. It is possible to achieve MIMO performance parameters such as ECC < 0.003, DG = 10, CCL < 0.4 (bits/s/Hz), TARC < -10 dB, and MEG ratio is 1.01. Simulated and measured results are compared, and the antenna is designed using ansys HFSS tool.
Dual-band 4-port Vivaldi MIMO Antenna for 5G mmWave Applications at 28/39 GHz
Vol. 119, 1-12, 2023
download: 148
Design of a Metasurface Inspired Circularly Polarized Dual-Band Compact Antenna for Biomedical Applications
Umhara Rasool , Javaid Ahmad Sheikh , Shazia Ashraf and Gh. Jeelani Qureshi
In this communication, a compact metasurface-based circularly polarized antenna with inverted L-shaped slots engraved in the ground is proposed for biomedical applications. The prospective antenna operates in the two frequency bands covering Medical Device Radio Service (Med Radio) and Industrial, Scientific, and Medicine (ISM) bands with center frequencies of 2.45 GHz and 4.1 GHz respectively. On mounting the prototype on the body, the impedance bandwidth of 14.4% and 42.5%, peak gain of 3.04 dB, and AR bandwidth of 0.3 GHz and 1.1 GHz in the two frequency bands (2.31-2.67 GHz and 3.28-5.04 GHz) are obtained respectively. For validating the prospective design, an antenna with the size of 0.264λ0 × 0.264λ0 × 0.014λ0 was fabricated on a Rogers RT/Duroid 6002 substrate and measurements were done in different scenarios. Link budget analysis of the device was also done for ensuring its communication ability.
Design of a Metasurface Inspired Circularly Polarized Dual-band Compact Antenna for Biomedical Applications