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In order to solve the problem of the stability of the UWB omnidirectional radiation antenna, a three-dimensional bipolar antenna is proposed, which is composed of metal frame with Klopfenstein curve boundary. The antenna is fed with a 50 Ω coaxial line and the reflection coefficient |S11| <-10 dB is achieved in the frequency range of 0.45–23.8 GHz. In addition, the H-plane pattern at 22 GHz in...
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