In this paper, a reconfigurable patch antenna with Circular Polarization (CP) diversity with theoretical discussion and verification is proposed for fifth generation (5G) of mobile communication systems. The proposed antenna contains two PIN diodes, which are correctly placed on the ground plane to obtain polarization diversity. By switching between two ON/OFF modes in the PIN diodes, the proposed antenna can support either the RHCP mode or the LHCP mode. An antenna with the wellmatched impedance bandwidths (S 11 ≤ −10 dB) of 2.5 GHz (27 ∼ 29.5 GHz) and 3 GHz (36 ∼ 39 GHz) and the dual-band 3-dB axial ratios of 6% (27.3-29 GHz) and 8.4% (35-38.2 GHz) operates in both the RHCP and LHCP modes. The experimental result shows that the proposed antenna has a circular polarization bandwidth at the central frequencies of 28 and 38 GHz for both the RHCP and LHCP.

In this letter, a wideband printed antenna and its arrays for 5G wireless cellular systems have been proposed. The proposed antenna is like the Yagi‐Uda antenna which fed by an optimized microstrip line. The single antennas have two kinds of bandwidth. In broadband case, it has |S11| < −10 dB with an impedance bandwidth of 47% (24.8‐40 GHz) and a range gain of 6.3‐8.9 dBi. In multiband case, it covers two licensed bandwidths for 5G systems (27‐29 GHz and 36‐40 GHz) and a range gain of 7.2‐7.9 dBi. Furthermore, by optimizing the constructive interference between the patches and the aperture, a relatively high antenna gain even with a wide beamforming across an azimuthal plane with the merits of the average gain equal 10.5 dBi could be obtained. The measurement results showed that the proposed antenna and array antenna have stable radiation patterns, low cross‐polarization, and high gain, exhibiting potential use for the applications of 5G wireless communication systems.

In this article, a dual-band sixth order double symmetric T-slot filter is proposed for the 5G communication systems. This filter contains two duplicate square resonators and a T-shape feedline on the Rogers RT duroid 5880 substrate. Operating at the 28 and 38.5 GHz frequencies from licensed 5G frequency bands and small size make this filter appropriate for different 5G applications. Furthermore, an LC equivalent circuit for the filter has been considered that helps us to have a better sight of this filter. Measurement results show good agreement with simulations. The attenuation on the passband is less than 1 dB. In order to evaluate the filter performance besides other millimeter waves components, a wideband antenna is combined with the filter to form a filtenna. The achieved results show the appropriate performance and well-matched with other 5G devices.

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