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A novel single‐layer coplanar‐fed circularly polarized (CP) microstrip antenna is proposed in this article. In order to improve the CP performance, a new sequential rotating feed network based on 3/4 λ (where λ is the wavelength in the medium) phase shift line is adopted in the antenna design, which is on the same plane as the radiating patch to achieve low‐profile characteristics. A curved microstrip...
The electric field derivative (dE/dt) radiation from lightning leaders are usually very weak, and it is hard to be recognized if the lightning strike is far from observation site. In this paper, Fourier analysis of a segment of noise contaminated dE/dt signal is conducted. Based on the identification of the noisy source and leader spectrum, a wavelet packed based method for detecting dE/dt signatures...
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