ACES Publication Search
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| Title: | ACES Journal August 2022 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1968 KB |
| Title: | ACES Journal August 2022 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 338 KB |
| Title: | ACES Journal August 2022 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 18906 KB |
| Title: | On Controlling the Passband and Stopband of UWB Band-Pass Filter |
| Abstract: | In this article, the passband, and stopband of quarter wavelength stubs-based Band Pass Filter (BPF) are controlled by a straightforward and new method. This method depends on inserting an attenuation pole and tuning the passband by a Circular Slot Ring Resonator (CSRR) and rectangular slot beneath the BPF’s stubs. Hence, controlling the passband width without any further area usage is achieved. The stop-band rejection level and bandwidth are controlled by inserting Band Stop Filter (BSF) after the BPF such that the used rectangular slots beneath the stubs control the stop-band bandwidth. For verification, third-order Chebyshev BPF and Butterworth BSF filters are used. The proposed filter passband is chosen to cover the sub-6 GHz different 5G bands. The proposed BPF has an ultra-wide 3 dB passband of 2.97 GHz (2.35 GHz - 5.32 GHz) and a 20 dB stopband of 4.59 GHz (6.18-10.77 GHz). The proposed BPF filter is fabricated, measured, and the results are in good agreement with their simulated counterparts. |
| Author(s): | T. G. Abouelnaga, E. A. Abdallah |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 4081 KB |
| Title: | Analytical Approximations for the Maximum-to-mean Ratio of the E-field in a Reverberation Chamber: A Review |
| Abstract: | The expected value of the maximum value of the rectangular E-field is important in radiated susceptibility testing in a reverberation chamber. In this paper, different forms of equations for the maximum-to-mean ratio of the rectangular E-field are reviewed. Important derivations are summarized and detailed. It is interesting to note that some series which could be difficult to deal with from mathematics could be solved efficiently from physical point of view. The relationship between the independent sample number N and the parameters in generalized extreme value distribution is also given. |
| Author(s): | Q. Xu, R. Jia, L. Geng, H. Guo, Y. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1349 KB |
| Title: | Tri-polarization Reconfigurable Fabry-Perot Resonator Antenna in Ku-band |
| Abstract: | In this paper, a broadband tri-polarization reconfigurable antenna applied to polarization diversity is proposed. A partially reflective surface (PRS) is designed to form an air-filled resonator cavity. The reflection phase of the PRS has a positive phase gradient in order to achieve the characteristics of the proposed antenna gain enhancement in the wideband. A metal patch of a four-arm meander structure is used as the radiation structure and the feeding is realized through a four-channel rotating feeding network with equal amplitude and 90◦ phase difference. The feeding network is connected to the radiation structure through four metallized vias. In order to realize the polarization reconfigurability, the PIN diodes and the corresponding DC bias circuit are integrated in the rotating feeding network. The characteristics of horizontal polarization (HP), vertical polarization (VP) and right-hand circular polarization (RHCP) are realized by changing the ON/OFF states of PIN diodes integrated in the feeding network. In order to verify the performance of the proposed antenna, fabrication and testing were carried out. The measurement results show that the −10 dB impedance bandwidths of HP, VP, RHCP are 11% (12.5-14 GHz), 6.4% (13.7- 14.6 GHz) and 20% (12.2-14.9 GHz), and the peak realized gains are 9.1, 9.2 and 11.5 dBi, respectively. For RHCP mode, the 3-dB axial ratio bandwidth reaches about 17% (12.35-13.4 GHz and 13.6-14.9 GHz). |
| Author(s): | S. Zhu, J. He, J. Yu, Y. Feng, S. Pan, G. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 3046 KB |
| Title: | Bayesian Optimization Based on Student’s T Process for Microstrip Antenna Design |
| Abstract: | Bayesian Optimization (BO) is an efficient global optimization algorithm, which is widely used in the field of engineering design. The probabilistic surrogate model and acquisition function are the two keys to the algorithm. Building an efficient probabilistic surrogate model and designing a collection function with excellent exploring capabilities can improve the performance of BO algorithm, allowing it to find the optimal value of the objective function with fewer iterations. Due to the characteristics of small samples and non-parametric derivation of the Gaussian Process (GP), traditional BO algorithms usually use the GP as a surrogate model. Compared with the GP, the Student’s T Process (STP) retains the excellent properties of GP, and has more flexible posterior variance and stronger robustness. In this paper, STP is used as the surrogate model in BO algorithm, the hyperparameters of the model are optimized by STP, and the estimation strategy function (EST) is improved based on the posterior output of the optimized STP, thus realizing the improved BO algorithm based on the STP. To verify the performance of the proposed algorithm, numerical experiments are designed to compare the performances of the traditional BO algorithm, which includes the lower confidence bound function (LCB) and EST as acquisition function respectively and GP as the surrogate model, and the proposed BO algorithm with STP as the surrogate model and LCB, expected improvement function (EI), expected regret minimization function (ERM) as acquisition function respectively. The results show that the proposed algorithm in this paper performs well when finding the global minimum of multimodal functions. Based on the developed algorithm in this paper, the resonant frequency of printed dipole antenna and E-shaped antenna is modeled and optimized, which further confirms the good design ability and design accuracy of the BO algorithm proposed in this paper. |
| Author(s): | Q. Li, F. Meng, Y. Tian, X. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1262 KB |
| Title: | Eight-port Diagonal Antenna with High Isolation and High Efficiency for 5G Smartphone |
| Abstract: | In this letter, an 8×8 multiple-input-multipleoutput (MIMO) antenna that operates in the sub-6 GHz (4.7-5.1 GHz) spectrum for 5G MIMO smartphone applications is presented. The design consists of a fully grounded plane with closely orthogonal antenna pairs placed symmetrically on the corners of the smartphone and each antenna element consists of an F-type monopole with dimensions of 18×7.5 mm2. Firstly, the diversity characteristics of orthogonally placed antennas are used to reduce the coupling between antennas. On the other hand, diagonal antennas are connected by a neutral line (NL) to further improve isolation and etched slots on the ground to reduce the coupling between antenna pairs. A good frequency bandwidth (S11 < −10 dB) of 4.7-5.1 GHz has been obtained for the MIMO antenna, and the isolation is lower than 16 dB. In addition, total efficiency (TE) is greater than 77.5%, and the envelope correlation coefficient (ECC) is lower than 0.025. The fabricated antenna prototype is tested and offers good performance. |
| Author(s): | R. Shao, J. Wang, X. Wang, Y. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 4733 KB |
| Title: | Quad-band Compact MIMO Antennas for 5G Mobile Communications |
| Abstract: | Three types of quad-band millimetric-wave two-port MIMO antenna systems are proposed for the forthcoming generations of mobile handsets. A novel printed antenna is introduced to be the single element of the proposed MIMO antennas. It is shown that the proposed MIMO antennas are capable of producing both spatial and polarization diversities that enhance the performance of mobile communications. Two configurations of co-polarized two-port MIMO antennas are proposed to provide spatial diversity, whereas a cross-polarized two-port MIMO antenna is proposed to produce polarization diversity. It is shown that all the proposed MIMO antennas can operate efficiently over the four frequency bands centered at 28, 43, 52, and 57 GHz. Prototypes are fabricated for the proposed MIMO antennas for the sake of experimental evaluation. The measurements agree with the simulation results showing high performance of the proposed types of MIMO antennas including the impedance matching, radiation patterns, envelop correlation coefficient, and diversity gain. Both the experimental and simulation results show that the achieved bandwidths, at the four operational frequency bands, are 0.6, 0.6, 1.8, and 1.5 GHz, respectively. Also, the radiation efficiencies calculated at the four operational frequencies are 86.5%, 87.5%, 89.2%, and 90.0%, respectively. The dimensions and the results concerning the performance of the proposed MIMO antennas are compared to other designs for MIMO antennas available in some recently published work. |
| Author(s): | A. E. Farahat, K. F. A. Hussein |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 11715 KB |
| Title: | A Compact High Gain Wideband Metamaterial Antenna for Sub-6 GHz Applications |
| Abstract: | This paper presents a design of high gain wideband antenna with metasurface for sub-6 GHz applications. The antennas at sub-6 GHz have a narrow bandwidth and low gain with a narrower axial ratio (AR). Hence, antennas combined with metamaterials are proposed to overcome these issues. The proposed metasurface antenna is designed with the implementation of W-shape transmission lines within the vias. The proposed antenna with metasurface is simulated using CST software and then fabricated on the FR4 substrate with (εr = 4.4 and h = 1.6 mm). The antenna performance achieved a wide bandwidth of 85% and operates at 2 GHz to 5 GHz. A compact size of 45% is achieved with a high gain of 7.12 dB. The proposed antenna is suitable to be used in future sub-6 GHz applications. |
| Author(s): | A. A. Abbas, B. S. Samet |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1637 KB |
| Title: | A Wideband Base Station Antenna Loaded with Bow-Tie-Like Parasitic Elements |
| Abstract: | A ±45° dual-polarization wideband antenna for 5G base station application is proposed using cross dipoles, bow-tie-like parasitic elements and baluns. The antenna is modeled, simulated, and optimized for an optimal size of 115 mm × 115 mm × 27.8 mm. A −10dB bandwidth is obtained to cover 2.24GHz- 3.75GHz, which has a fractional bandwidth of 50.4%. In the design, bent Γ-shaped microstrip lines are to achieve higher isolation that is better than 25dB. The proposed antenna is fabricated and measured to get a result that it has a wide bandwidth, good directional radiation patterns, and a high peak gain of 8.1±1.1dBi, making it suitable for 5G base station applications. |
| Author(s): | J. Qi, J. Pan, Y. Li, G.-L. Huang |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 3545 KB |
| Title: | esign and Analysis of Dual Narrow Band MIMO (DNB-MIMO) Antenna for IoT Applications |
| Abstract: | A compact DNB-MIMO antenna design and analysis for IoT application was proposed. The antenna radiator consists of 2 L-shaaped quarter-wavelengths and inverted 7-shaped radiators with a microstrip feed line, and partial ground plane with a size of 32 × 15 mm2. This antenna achieves a higher quality factor (Q > 10) and narrow band impedance matching at the central frequencies of 1.8 GHz and 2.4 GHz bands with approximately 8.2% and 6.2% bandwidth respectively. The suitability of the designed antenna for IoT applications is verified through the hosting device model. The proposed 4-port MIMO antenna has an overall size of 60 × 60 × 1.6 mm3, and it is printed on an FR4 substrate. The diversity add comma such as ECC, DG, TARC, MEG, and CCL, are calculated and there values are<0.19, 9.85 dB, < -25 dB, < -6 dB, < 0.19 bits/Hz/s, respectively, within the limits. The proposed antenna is integrated with the Zigbee module (lowercase) to analyze the performance for IoT applications at 2.4 GHz. |
| Author(s): | S. Thiruvenkadam, E. Parthasarathy |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 13785 KB |
| Title: | Fractal Sectoral Monopole Antenna for UWB Band Applications |
| Abstract: | This paper proposes a fractal monopole antenna based on a sectoral-shaped patch. To improve the gain of the proposed antenna over a larger bandwidth, the matching was enhanced by attaching two rectangular stubs to the feeding line. The antenna, which is built on an FR4 epoxy substrate with εr =4.3 and a loss tangent of 0.018 has a compact size of 28 mm×31 mm×1.6 mm. The antenna covers the UWB range and extends to about the 22 GHz frequency, as well as offers omnidirectional radiation patterns. The optimized configuration was fabricated and tested. The impedance bandwidth of the proposed antenna is about 155% with a reflection coefficient better than −10 dB and has a maximum gain of nearly 4 dBi with a relatively stable omnidirectional radiation pattern. |
| Author(s): | A. H. Majeed, K. H. Sayidmarie |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 8 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 4681 KB |