Compact broadband filtering antenna based on cross coupling structure and MIMO antenna thereof
A technology of cross-coupling and filtering antennas, which is applied in the directions of antenna arrays, antennas, and slot antennas that are energized separately. It can solve the problems of large size, limited number of antennas, and large filter antenna unit size, and achieve small size, improved suppression, and The effect of bandwidth
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Embodiment 1
[0043] This embodiment provides a miniaturized broadband filter antenna based on a cross-coupling structure, the overall structure of which is shown in figure 1 As shown, the side view is as figure 2 As shown, it includes a first dielectric substrate 1, a metal floor 2, and a second dielectric substrate 3 that are the same size and closely adhered from top to bottom. The top view of the metal layer on the upper surface of the first dielectric substrate 1 is as image 3 As shown, a rectangular metal patch 4 and two U-shaped parasitic patches 5 are arranged at the center of the upper surface, which together serve as the radiation structure of the antenna; the two U-shaped parasitic patches 5 have opposite openings and are placed symmetrically around the rectangular metal patch 4 ; The rectangular metal patch 4 is etched with a split ring gap 6, and the opening of the split ring gap 6 faces upward. The top view of metal floor 2 is as Figure 4 As shown, there are two parallel slit...
Embodiment 2
[0053] A compact broadband MIMO filter antenna based on a cross-coupling structure. The unit described in the first embodiment is used as the unit antenna, and two by two orthogonally placed to form a 2×2 MIMO antenna. Its structure is as follows Figure 14 As shown, the edge spacing of adjacent microstrip feed structures is 1.7mm (0.028λ 0 ).
[0054] The MIMO filter antenna is simulated and analyzed, and the simulation results are as follows Figure 15 As shown, the isolation between antenna elements is within the working frequency band (|S 11 | Figure 16 As shown, it is lower than 0.06 in the working frequency band.
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