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Design of Dual-Frequency MIMO Antenna with High Isolation Based on Odd-Even Mode Analysis Method and Defected Ground Structure

This paper proposes a MIMO antenna that can work in two frequency bands of 2. 45GHz and 5. 8GHz. For this antenna structure, two decoupling methods are designed to improve the isolation of the two working frequency bands of the MIMO antenna In this way, the influence between multiple ports can be reduced and the normal operation of the antenna can be guaranteed. For the 2. 45GHz frequency band, the odd-even mode analysis method is adopted to achieve the effect of improving the isolation through impedance matching under the odd-even mode excitation. The process is mainly through theoretical calculation and analysis to obtain a decoupling structure, avoiding the tedious structural optimization process. The actual antenna experiment shows that S12 is reduced by 9dB. For the frequency band of 5. 8GHz, the E-shaped defected ground structure is selected, and S12 is reduced by 13dB without affecting the working effect of the low frequency band.