A Method to Improve the Mutual Isolation of Antenna Ports Using Planar/Wideband Coupling Suppression Structure
Diversified communication mission requires more and more antennas to be integrated into the same sys-tem.Adjacent antennas inevitably influence each other,leading to a decline of the mutual isolation of the antennas'ports.This paper proposes a planar/wideband coupling suppression structure(PWCSS)resonated in the high frequency band to re-duce the radar scattering cross section(RCS)of the low band element and absorb energy from the low band element in the high frequency band and improve the mutual isolation of the two antenna elements'ports in the high band.Compared to the previous approach,the PWCSS proposed in this paper has the following advantages.First,its usage will not bring extra gain loss for lower band element,and will not affect the radiation pattern of both the lower and higher band elements.Sec-ond,it does not require lamination process,which means low cost and high integration.Third,it contains open circuit mi-crostrips with various lengths and positions,which can effectively extend the bandwidth of coupling suppression.The au-thor simulated,manufactured and tested the antenna.Results show that the average/maximum mutual isolation in the high frequency band can be enhanced by 16.6 dB and 30 dB when the PWCSS is applied.This coupling suppression method can be very useful to base station,detection,radar and other multi-antenna systems,and has a good application prospect.
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