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2022-11-25
PIER Letters
Vol. 108, 9-13, 2023
download: 38
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: 76
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