ACES Publication Search
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| Title: | ACES Journal April 2023 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 4 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 1966 KB |
| Title: | ACES Journal April 2023 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 4 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 189 KB |
| Title: | ACES Journal April 2023 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 4 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 11539 KB |
| Title: | A Compact Circularly Polarized Crossed Dipole Antenna with Wide Bandwidth using Split Ring Resonator and Parasitic Patches |
| Abstract: | A new compact broadband circularly polarized (CP) crossed dipole antenna using split ring resonator (SRR) and parasitic patches are presented. The proposed antenna is mainly composed of two orthogonal strip dipoles, two 90° phase delay lines, four SRRs, and four parasitic patches. The combination of the orthogonal strip dipoles and the delay lines forms a crossed dipole as the main CP radiator. The well-designed SRR can extend the current path and improve the current distribution of high-frequency without increasing the size of the antenna, thereby reducing the size of the antenna and increasing the axial ratio (AR) bandwidth of the high-frequency. The introduction of parasitic patches can improve the current distribution between the upper and lower cut-off frequency points of the bandwidth, and make up for the defects of the insufficient bandwidth of the crossed dipole and the SRR, thereby realizing broadband CP radiation. To verify the antenna, a physical prototype is fabricated. The measured results show that the impedance bandwidth (IBW) of 69.1% (1.38-2.84 GHz), and a wide AR bandwidth of 57.7% (1.43-2.59 GHz). In addition, the designed antenna achieves a stable gain in the working band and a certain band-edge selectivity. Such a single-fed, simple structure and the wideband CP antenna is an excellent candidate for communication systems such as ISM (2.4 GHz), WiBro (2.3-2.39 GHz) and Inmarsat. |
| Author(s): | H. Yang, Z. Guo, X. Li, Y. Zhang, X. Song, S. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 4 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 2050 KB |
| Title: | A Three-dimensional Compact Propeller-shaped Circularly Polarized Ceiling Antenna |
| Abstract: | A three-dimensional compact propellershaped circularly polarized ceiling-mounted antenna loaded by inverted L-shaped slot is proposed in this paper. This three-dimensional structure has a small size, single feed and half-plane radiation mode. The antenna is composed of four alternately welded radiating elements and a disc reflector. Each radiating element is formed by etching a rectangular microstrip radiating patch and a trapezoidal microstrip radiating patch on the surface of the substrate. The four radiating elements are welded vertically on the disc reflector. The back of the disc reflector has the ground plane. The antenna is fed coaxially through the via in the center of the disc reflector. The result demonstrates that the 10-dB impedance fractional bandwidth achieves 66.3% (4.4-8.94 GHz). The 3-dB axial ratio fractional bandwidth is 2.2% (6.44- 6.58 GHz). The radiation characteristic is close to halfspace radiation on the xoz plane and the yoz plane. The peak gain of the antenna is 3.22 dBi. The simulation and measurement results are in good agreement.With its compact structure, effective coverage, miniaturization, etc., the antenna is very suitable for applications such as biomedical monitoring equipment and short-range radio communications. |
| Author(s): | J.-X. Chen, H.-T. Xing, J.-M. Huang, M.-N. Wang, Z.-H. Ma |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 4 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 1334 KB |
| Title: | Equivalent Circuits of Dipole Antennas for Broadband Applications |
| Abstract: | In this paper distributed parameter equivalent circuits are developed for linear dipoles, dielectric coated dipoles and lumped loaded dipoles. Theoretical solutions for each distributed parameter and the reasonable non-uniform segmentation of antennas serve as the foundation for the derivation. The accomplished validations of the modeling procedures indicate that the given equivalent circuits are capable of correctly describing dipole antennas in frequency and time domains, with the advantages of wideband, frequency independence and unambiguous physical meaning. Relying on the presented equivalent circuits, broadband issues such as simulating input impedance, predicting equivalent lengths and computing transient responses of dipole antennas can be readily addressed. In addition, the circuit model provides helpful insights into the analysis and design for the loaded dipole antennas. |
| Author(s): | B. Wang, H. Ning, Y. Yan, C. Cao, M. Zhu |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 4 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 2074 KB |
| Title: | Design of a Retransmitted Chipless Tag based on Multi-state Resonators |
| Abstract: | In order to increase the encoding capacity and reduce the size of the tag, this paper proposes the frequency sharing method to design a retransmitted chipless tag, which is composed of N resonators, a coupled microstrip transmission line, and the orthogonal transmitting antenna and receiving antenna. A pair of the same size resonators is placed symmetrically on both sides of the coupled microstrip transmission line. M open-ended stubs (OES) with different combinations are embedded in each resonator to obtain different resonance frequencies. The frequency sharing multi-state resonators’ chipless tags are designed where N=6, M=4, and the dimension of the tag is 46 mm × 30 mm, which can generate about 212 codes. Simulation and measurement results show good agreement and feasibility of the tag design. The chipless tag is small in size, has large encoding capacity and is easy to print. This kind of tag has no silicon chip so the cost is low. It can be widely used in logistics, supermarkets and other fields to replace the barcode. |
| Author(s): | N. Huang, Z. Ma |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 4 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 1090 KB |
| Title: | Shaping the Probability Density Function of the Output Response in a Reverberation Chamber |
| Abstract: | This paper shows that the received power and E-field in a reverberation chamber (RC) can be shaped by tuning the statistical properties of input signals. For a given probability density function (PDF) of an RC response, the Fourier transform method can be applied to find the PDF of the input signal. Numerical and measurement verifications are given to validate the theory. Limitations are also analyzed and discussed. |
| Author(s): | Q. Xu, F. Tian, Y. Zhao, R. Jia, E. Cheng, L. Xing |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 4 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 1286 KB |
| Title: | A Novel Method for the Low-detectable Dihedral Corner Utilizing Phase Gradient Metasurface based on Phase Cancellation Mechanism |
| Abstract: | In this paper, a phase gradient metasurface (PGM) is proposed to reduce the radar cross-section (RCS) of the dihedral corner based on phase cancellation mechanism. The phase cancellation mechanism is used to derive the formula of the low-detectable dihedral corner for the first time, which is directly used to deal with the wave path difference problem that introduced by the dihedral corner. According to the formula, six sub-cells are designed with a 60° phase difference, which is arranged by sub-array along the y-axis. The reflection coefficients of the selected sub-cells are all above 0.8. The RCS reduction of the dihedral corner achieves over 10 dB from 4.9 GHz to 5.14 GHz under an incident angle of 45°. In particular, the RCS reduction of the low-detectable dihedral corner is 13.97 dB at 5 GHz. Meanwhile, the proposed dihedral corner with PGM also has an excellent performance of angle insensitivity ranging from 0° to 75°. To further verify our design, the dihedral corner with PGM is manufactured by a low-cost printing circuit board technique. The measured results agreed well with the simulations, and both of them show an excellent performance of RCS reduction in the operating frequency band, regardless of any angle within 75°. Overall, the dihedral corner with PGM that we proposed has the advantages of being low-detectable, low-profile, low-cost, lightweight, and it is easy to design and manufacture. It has wide application prospects in the future. |
| Author(s): | Q. He, J. Xie, Q. Liu, X. Yao, Z. Wang, H. Chen, F. Li, L. Deng |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 4 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 2345 KB |
| Title: | An Ultra-small Heated Area Masked Microwave Hyperthermia Therapy Scheme in Fresnel Region |
| Abstract: | This paper introduces a localized masked thermal therapy method for only the breast through the Fresnel region. A pyramidal horn antenna has been used as a hyperthermia system applicator. The antenna is fed by a Yagi array and resonates at 4.74 GHz. A metal plate with a square slot masked the breast phantom. The antenna irradiates the breast phantom for 5 and 10 minutes with input power of 10 and 20 watts (W). Thermal and specific absorption rate (SAR) distributions are studied under the same conditions for a fair comparison between masked and unmasked system performance. The square slot dimensions are altered, and their effects are studied considering the phantom heated area. Moving from unmasked to masked hyperthermia scenarios, a heated area size reduction of 99.87% is achieved along with a very considerable SAR value reduction. The masked scenario elevates the breast temperature to 43 °C in a very concentrated area. The proposed system can elevate only an area of 2×2 mm2 of the breast tissue to a temperature of 40 °C in 5 minutes, and that is a very promising result in hyperthermia therapy applications. |
| Author(s): | T. G. Abouelnaga, M. R. Abdel-Haleem |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 4 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 3709 KB |
| Title: | Sectional Modular Technology for Reducing Detent Force of Linear Unit in Linear-rotary Flux-switching Permanent-magnet Generator for Wind-wave Combined Energy Conversion |
| Abstract: | A linear-rotary flux-switching permanent magnet (FSPM) generator (LRFSPMG) is a potential candidate for a wind-wave combined energy conversion (WWCEC) system. The linear unit of the LRFSPMG is a tubular FSPM linear generator (TFSPMLG), which like other permanent magnet linear generators, has an inherent detent force problem. To alleviate this problem, a sectional modular technology scheme is investigated to reduce the detent force of the TFSPMLG. Firstly, the structure is briefly introduced and the detent force analyzed. Secondly, the sectional modular TFSPMLGs are presented and their feasibility verified with respect to the stator of the TFSPMLG being split into two and three sections, forming Modulars I and II, respectively. After that, the detent force suppression principle, and the effects that the sectional modular structures exert on the detent force are analyzed. According to the analysis results, two methods are presented to suppress the detent force: one is to suppress the magnetic coupling effect; the other is to reduce the remaining harmonics. Finally, the three TFSPMLGs, including the initial TFSPMLG, Modular I, and Modular II, are comparatively analyzed by finite-element analysis (FEA). The results show that both the detent forces are greatly reduced without sacrificing the back electromotive force (EMF) and average electromagnetic force, thereby proving the effectiveness of the TFSPMLG with a sectional modular structure. |
| Author(s): | G. Zhang, R. Nie, J. Si, X. Feng, C. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 38 Number: 4 Year: 2023 |
| Download Link: | Click here to download PDF File Size: 5509 KB |