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Integration of 5G MIMO Antenna Array with Low-Profile GSM Band Base-Station Antenna

In this paper, a dual-polarized 5G planar MIMO antenna array is integrated with one GSM band antenna element for multi-band base-station applications. Using frequency selective surface (FSS), a shared-aperture configuration covering 0.69-0.96 GHz band (B1) and the 3.3-5 GHz band (B2) is achieved. Compact size characteristic is realized by the capacitive loading effect of FSS. Due to the extremely limited space, feeding cables of B2 antenna array bring severe deteriorations on performance of B1 band antenna. A novel decoupling method which spiral coaxial cables with specific radium is proposed to eliminate these influences. On the other hand, port to port isolations in closely spaced B2 band antenna array are improved by disconnected baffle structures. The total size of the proposed array is 0.93λL × 0.93λL × 0.17λL (λL is the wavelength at the center frequency of B1), which makes this array an ideal candidate for future 5G massive MIMO base station antenna developments.