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In this paper, A multi-layered composite wideband absorbing material covering dual band is designed and fabricated. The upper layer is a traditional absorber while the lower one is a dual-frequency frequency selective surface (FSS) formed by a square ring and an improved Jerusalem cross structure. The absorbing band has been broadened significantly compared with those of the traditional absorber without...
A broadband curvilinear dipole is presented, and impedancematching network including Non-Foster elements is employed to broaden its bandwidth. The antenna is precisely designed in a curved shape with the dimension of 1100 mm × 85 mm. The bandwidth for VSWR less than 2 ranges from 290MHz to 765MHz. Then, a conventional LC matching network is designed for the antenna, which brings a bandwidth of 5 octaves...
In this paper, a novel design of printed Yagi antenna is presented. To improve the input and radiation performance, the driver and directors are modified. And the simulated results are compared with the measured data. This proposed antenna achieves a measured 10% bandwidth for VSWR<2, better than 11.9 dB front-to-back ratio, and 8.3 dB absolute gain across the operating bandwidth. Furthermore,...
A modified monopole antenna with plate-loads for bandwidth enhancement is proposed in this paper. The modified monopole antenna is designed based on a semicircular-base monopole. Two rectangle plates are attached to its radiating edges to increase the frequency range significantly. Its radiation characteristics including impedance bandwidth, radiation patterns, and gain are simulated and measured...
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