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A quasi-Yagi antenna with parasitic cells and its array are proposed for 5G mm-wave bands. For the antenna unit, through introducing the parasitic cells, the gain could be enhanced maximum of 1.3 dB without increasing the antenna length and a wide bandwidth served for the 5G N258 band. Besides, substrate integrated waveguide (SIW) with short-circuit metal vias is employed as the feed structure and reflector, which can easily tune the impedance matching. For the antenna array, by designing a SIW power divider, the antenna element can be convenient to integrate as a 1 Â 4 end-fire array. The antenna unit and its array have been fabricated and measured. The measured results show that the high peak gain of the element and array is 9.06 and 14.38 dB within the operation bands (24.25-27.5 GHz), respectively. It is suitable for miniaturized endfire devices with 5G N258 mm-wave operation systems.

This article proposes a compact hepta‐band antenna for unbroken metal‐rimmed mobile applications. The proposed antenna includes a vertical copper plate, an open slot and printed multi‐branches on both sides of the substrate. The 1‐λ bezel mode is employed to cover the GSM850/900 operating bands. By combining the different modes of the multiple branches, the proposed antenna is capable of covering GSM1800/1900, UMTS, GSM2300/2500 bands. Besides, a design strategy for enhancing the bandwidth of lower and higher bands is introduced. The mentioned structures are combined on the 122 × 60 mm2 substrate board without lumped elements. The measured results show our proposed antenna achieves three‐wide bandwidths, which typically agree with the simulation results. Meanwhile, the performances of radiation patterns, efficiencies, and gains are also obtained.

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