Assessment of EMI Measurement on An Interchangeable-Pair of Planar Spearhead UWB Monopole Antennas

This paper performs the assessment of electromagnetic interference between an interchangeable-pair of planar spearhead monopole antennas (PSMAs). Both antennas have ultra-wideband (UWB) characteristics, working on the frequency range from 3.75 GHz to more than 20 GHz. These two PSMAs with varying relative position configurations are separated by several distances representing near-field, Fresnel, and far-field regions. The phenomenon of electromagnetic interference (EMI) is observed through the transmission coefficient (S
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) performance at the separation distances of 1 cm, 5 cm, and 20 cm. The analysis is carried out at the frequency of 1 GHz to 20 GHz through simulations and then validated by measurements. The simulation results show that along the operating frequency of PSMAs at the separation distance of 1 cm, 5 cm, and 20 cm, the S
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values vary from –7.24 dB to –47.38 dB, –21.48 dB to –44.53 dB, and –28.58 dB to –72.43 dB, respectively. In comparison, the measurements have values from –10.84 dB to –53.11 dB, –19.31 dB to –67.98 dB, and –31.08 dB to –78.76 dB, respectively.