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2022-12-06
PIER Letters
Vol. 108, 25-30, 2023
download: 23
Performance Analysis of a Single Layer X-Band Frequency Selective Surface Based Spatial Filter Implementing Half Jerusalem Cross Slot
Harikrishna Paik Kambham Premchand
This work proposes and experimentally evaluates a single layer bandpass frequency selective surface (FSS) that resonates at X-band (8-12 GHz). The metal plate of the unit cell has a half-Jerusalem cross slot of size 0.15λ0, where λ0 is the wavelength corresponding to 10 GHz centre frequency. The effects of unit cell parameters on filter response are analyzed through parametric analysis. The results reveal that the proposed bandpass FSS exhibits good polarization stability and angular stability at oblique angles up to 45˚. Furthermore, negligible frequency deviations in both TE and TM polarizations have also been achieved using this structure. A prototype of the bandpass FSS was fabricated on an FR4 substrate to validate the proposed design which includes 10×10 elements in a dimension of 45 mm × 45 mm × 1.6 mm. Measurements show that the bandpass FSS has a fractional bandwidth of 40% centered at 10 GHz from 8 GHz to 12 GHz. The unique feature of the proposed filter is its ability to operate in the whole X band (8-12 GHz) by tuning the filter elements.
Performance Analysis of a Single Layer X-band Frequency Selective Surface Based Spatial Filter Implementing Half Jerusalem Cross Slot
2022-12-02
PIER Letters
Vol. 108, 15-23, 2023
download: 41
Research on Multi-Band Absorbers Based on Electromagnetic Metamaterials
Fugui Liu Bin Xu Xiaonan Li Guo-Qiang Liu
The rapid development of telecommunication systems has promoted the research of electromagnetic metamaterial absorbers. Based on the equivalent circuit theory, this paper proposes and designs a broadband absorption absorber based on electromagnetic metamaterials, which adopts a sandwich structure with an overall absorber thickness of 3.234 mm. The results show that the absorber has an absorption rate of more than 90% in the X-, Ku-, and K-bands (8.06 GHz-18.46 GHz) for the incident angle varying in the range of 0-50°. The absorption rate is higher than 90% for TE and TM mode electromagnetic waves and electromagnetic waves with polarization angle in the range of 0-50°. The absorber still has good absorption characteristics. The study shows that the absorber has small size, thin thickness, and broad angle broadband absorption characteristics.
Research on Multi-band Absorbers Based on Electromagnetic Metamaterials
2022-11-25
PIER Letters
Vol. 108, 9-13, 2023
download: 77
Design of Three-Mode Filtering Power Divider for Ship Anti-Signal Interference
Mingxin Liu Zongjie Cheng Wei Xu Fang Yang Jie Lin
This paper presents a novel microstrip three-mode filtering power divider (FPD) with high frequency selectivity and high isolation, which integrates only a single resonator and a resistor to realize the dual functions of the power division and filtering. In order to further improve its frequency selectivity and obtain wide upper stop band, three open stubs are loaded into the input and output ports of the filter power divider. The measured and simulated results show that the range of S11 < -10 dB is 1.86~2.1 GHz; the relative bandwidth of 3 dB is 17.9%; the in-band isolation is higher than 26 dB; and it has a relatively simple topology.
Design of Three-mode Filtering Power Divider for Ship Anti-signal Interference
2022-11-20
PIER Letters
Vol. 108, 1-8, 2023
download: 108
Coplanar Series-Fed Spiral Antenna Arrays for Enlarged Axial Ratio Bandwidth
Kazuhide Hirose Yuki Tamura Masaki Tsugane Hisamatsu Nakano
We study two array antennas to expand a 3 dB axial ratio bandwidth. Each array is located at a quarter wavelength above the ground plane and analyzed using the moment method. First, we use paired spiral elements fed by balanced parallel lines to avoid unwanted radiation from the feedline. It is found that the antenna shows an axial ratio bandwidth of 30%. Next, the elements are separated and fed by a single feedline to simplify the feed system. It is revealed that the antenna can radiate a circularly polarized wave under a feedline radiation of less than -16 dB. The frequency responses show that an axial ratio < 3 dB and VSWR < 2 are obtained in a bandwidth of 21%, where the gain is more than 13.3 dBi. The simulated results are verified with experimental ones.
Coplanar Series-fed Spiral Antenna Arrays for Enlarged Axial Ratio Bandwidth